On macOS Mojave, the OS started using the XOR-by-a-secret-key scheme (same as glibc is alread doing) for storing the SP value in setjmp environment. We need to adjust for that to keep supporting setjmp/longjmp on latest Darwin. The patch is basically doing the same what we're already doing for glibc.
rdar://problem/43542596
Differential Revision: https://reviews.llvm.org/D51064
llvm-svn: 340350
The synchronous dispatch functions in GCD (dispatch_sync, dispatch_barrier_sync), don't make a copy of the passed block. To maintain binary compatibility, we should avoid doing that as well in TSan, as there's no reason to do that. The synchronous dispatch functions will not return before the block is actually executed.
rdar://problem/42242579
Differential Revision: https://reviews.llvm.org/D50920
llvm-svn: 340342
Summary:
When deallocating thread stacks, we use one thread's unsafe stack size
to deallocate another thread's unsafe stack; however, the two sizes may
differ. Record an unsafe stack's size in the thread stack linked list.
Reviewers: pcc, eugenis
Reviewed By: eugenis
Subscribers: delcypher, llvm-commits, #sanitizers, kcc
Differential Revision: https://reviews.llvm.org/D51016
llvm-svn: 340308
Summary:
The idea behind this change is to allow sanitization of libc. We are prototyping on Bionic,
but the tool interface will be general enough (or at least generalizable) to support any other libc.
When libc depends on libclang_rt.hwasan, the latter can not interpose libc functions.
In fact, majority of interceptors become unnecessary when libc code is instrumented.
This change gets rid of most hwasan interceptors and provides interface for libc to notify
hwasan about thread creation and destruction events. Some interceptors (pthread_create)
are kept under #ifdef to enable testing with uninstrumented libc. They are expressed in
terms of the new libc interface.
The new cmake switch, COMPILER_RT_HWASAN_WITH_INTERCEPTORS, ON by default, builds testing
version of the library with the aforementioned pthread_create interceptor.
With the OFF setting, the library becomes more of a libc plugin.
Reviewers: vitalybuka, kcc, jfb
Subscribers: srhines, kubamracek, mgorny, jfb, llvm-commits
Differential Revision: https://reviews.llvm.org/D50922
llvm-svn: 340216
Summary:
Use `FUTEX_PRIVATE_FLAG` in conjunction with the wait & wake operations
employed by `BlockingMutex`. As far as I can tell, the mutexes are
process-private, and there is an actual performance benefit at employing the
private operations. There should be no downside to switching to it.
Reviewers: eugenis, alekseyshl, dvyukov
Reviewed By: dvyukov
Subscribers: kubamracek, delcypher, #sanitizers, llvm-commits
Differential Revision: https://reviews.llvm.org/D50910
llvm-svn: 340178
task_vm_info is a "revisioned" structure, new OS versions add fields to the end, and compatibility is based on the reported size. On older OS versions, min_address/max_address is not filled back. Let's handle that case. Unfortunately, we can't really write a test (as the failure only happens when on a specific OS version).
Differential Revision: https://reviews.llvm.org/D50275
llvm-svn: 340058
Summary:
We avoid using dynamic memory allocated with the internal allocator in
the profile collection service used by profiling mode. We use aligned
storage for globals and in-struct storage of objects we dynamically
initialize.
We also remove the dependency on `Vector<...>` which also internally
uses the dynamic allocator in sanitizer_common (InternalAlloc) in favour
of the XRay allocator and segmented array implementation.
This change addresses llvm.org/PR38577.
Reviewers: eizan
Reviewed By: eizan
Subscribers: llvm-commits
Differential Revision: https://reviews.llvm.org/D50782
llvm-svn: 339978
Summary:
Since we're casting from double to size_t during input selection, we
really want a discrete distribution over size_t rather than a piecewise
distribution over doubles.
Reviewers: kcc
Reviewed By: kcc
Subscribers: llvm-commits
Differential Revision: https://reviews.llvm.org/D50356
llvm-svn: 339973
This reapplies commit r339935 with the following changes:
* make longjmp test C, not C++, to avoid dependency on libc++/libstdc++
* untag pointer in memset interceptor
x86_64 does not have TBI, so hwasan barely works there. Tests must be carefully
written in a way that does not leak tagged pointer to system libraries.
llvm-svn: 339963
Summary:
A callback to annotate longjmp-like code.
Unlike __asan_handle_no_return, in hwasan we can not conservatively
"unpoison" the entire thread stack, because there is no such thing as
unpoisoned memory. Pointer and memory tags must always match.
Reviewers: vitalybuka, kcc
Subscribers: kubamracek, llvm-commits
Differential Revision: https://reviews.llvm.org/D50752
llvm-svn: 339935
- The alternative syscall exists only on FreeBSD.
- Adding OpenBSD's equivalent and while at it other
remaining oses ones.
Reviewers: vitalybuka, krytarowsky, hiraditya
Reviewed By: hiraditya
Differential Revision: https://reviews.llvm.org/D50760
llvm-svn: 339886
Summary:
This reverses an earlier decision to allow seg-faulting from the
XRay-allocated memory if it turns out that the system cannot provide
physical memory backing that cannot be swapped in/out on Linux.
This addresses http://llvm.org/PR38588.
Reviewers: eizan
Reviewed By: eizan
Subscribers: llvm-commits
Differential Revision: https://reviews.llvm.org/D50831
llvm-svn: 339869
This relands commit r339405 (reverted in commit r339408.) The original
revert was due to tests failing on a darwin buildbot; however, after
looking at the affected code more I realized that the Darwin safestack
support has always been broken and disabled it in r339719. This relands
the original commit.
llvm-svn: 339723
Summary:
Darwin support does not appear to be used as evidenced by the fact that
the pthread interceptors have never worked and there is no support for
other common threading mechanisms like GCD.
Reviewers: pcc, eugenis, kubamracek
Reviewed By: pcc, kubamracek
Subscribers: kubamracek, mgorny, delcypher, llvm-commits, #sanitizers, kcc
Differential Revision: https://reviews.llvm.org/D50718
llvm-svn: 339719
Summary:
There is a race window in the deallocation path when the Quarantine is bypassed.
Initially we would just erase the header of a chunk if we were not to use the
Quarantine, as opposed to using a compare-exchange primitive, to make things
faster.
It turned out to be a poor decision, as 2 threads (or more) could simultaneously
deallocate the same pointer, and if the checks were to done before the header
got erased, this would result in the pointer being added twice (or more) to
distinct thread caches, and eventually be reused.
Winning the race is not trivial but can happen with enough control over the
allocation primitives. The repro added attempts to trigger the bug, with a
moderate success rate, but it should be enough to notice if the bug ever make
its way back into the code.
Since I am changing things in this file, there are 2 smaller changes tagging
along, marking a variable `const`, and improving the Quarantine bypass test at
runtime.
Reviewers: alekseyshl, eugenis, kcc, vitalybuka
Reviewed By: eugenis, vitalybuka
Subscribers: delcypher, #sanitizers, llvm-commits
Differential Revision: https://reviews.llvm.org/D50655
llvm-svn: 339705
Summary:
Export __sanitizer_malloc, etc as aliases to malloc, etc.
This way users can wrap sanitizer malloc, even in fully static binaries.
Both jemalloc and tcmalloc provide similar aliases (je_* and tc_*).
Reviewers: vitalybuka, kcc
Subscribers: llvm-commits, kubamracek
Differential Revision: https://reviews.llvm.org/D50570
llvm-svn: 339614
Summary:
Don't crash when /proc/self/maps is inaccessible from main thread.
It's not a big deal, really.
Reviewers: vitalybuka, kcc
Subscribers: kubamracek, llvm-commits
Differential Revision: https://reviews.llvm.org/D50574
llvm-svn: 339607
Summary:
Provide __hwasan_shadow_init that can be used to initialize shadow w/o touching libc.
It can be used to bootstrap an unusual case of fully-static executable with
hwasan-instrumented libc, which needs to run hwasan code before it is ready to serve
user calls like madvise().
Reviewers: vitalybuka, kcc
Subscribers: kubamracek, llvm-commits
Differential Revision: https://reviews.llvm.org/D50581
llvm-svn: 339606
Summary:
When compiling with `WERROR=ON` & a recent clang, having the `st(?)` registers
in the clobber list produces a fatal error (except `st(7)` for some reason):
```
.../sanitizer_common/sanitizer_atomic_clang_x86.h:98:9: error: inline asm clobber list contains reserved registers: ST0, ST1, ST2, ST3, ST4, ST5, ST6 [-Werror,-Winline-asm]
"movq %1, %%mm0;" // Use mmx reg for 64-bit atomic moves
^
<inline asm>:1:1: note: instantiated into assembly here
movq 8(%esp), %mm0;movq %mm0, (%esi);emms;
^
.../sanitizer_common/sanitizer_atomic_clang_x86.h:98:9: note: Reserved registers on the clobber list may not be preserved across the asm statement, and clobbering them may lead to undefined behaviour.
"movq %1, %%mm0;" // Use mmx reg for 64-bit atomic moves
^
<inline asm>:1:1: note: instantiated into assembly here
movq 8(%esp), %mm0;movq %mm0, (%esi);emms;
^
```
As far as I can tell, they were in there due to the use of the `emms`
instruction, but removing the clobber doesn't appear to have a functional
impact. I am unsure if there is a better way to address this.
Reviewers: eugenis, vitalybuka
Reviewed By: vitalybuka
Subscribers: kubamracek, delcypher, jfb, llvm-commits, #sanitizers
Differential Revision: https://reviews.llvm.org/D50562
llvm-svn: 339575
HWASan will not run on older Android releases where we use
__android_log_write for logging.
This dependency is also harmful in the case when libc itself depends
on hwasan, because it creates a loop of
libc -> hwasan -> liblog -> libc
which makes liblog vs libc initialization order undetermined.
Without liblog the loop is just
libc -> hwasan -> libc
and any init order issues can be solved in hwasan.
llvm-svn: 339449
This reverts commit r339405, it's failing on Darwin buildbots because
it doesn't seem to have a tgkill/thr_kill2 interface. It has a
__pthread_kill() syscall, but that relies on having a handle to the
thread's port which is not equivalent to it's tid.
llvm-svn: 339408
Summary:
glibc can call SafeStack instrumented code even after the last pthread
data destructor has run. Delay cleaning-up unsafe stacks for threads
until the thread is dead by having future threads clean-up prior threads
stacks.
Reviewers: pcc, eugenis
Reviewed By: eugenis
Subscribers: cryptoad, eugenis, kubamracek, delcypher, llvm-commits, #sanitizers, kcc
Differential Revision: https://reviews.llvm.org/D50406
llvm-svn: 339405
Summary:
When compiling with WERROR=ON, a new fatal warning started popping up recently
(due to -Werror,-Winline-asm):
```
.../lib/sanitizer_common/sanitizer_linux.cc:1214:24: error: inline asm clobber list contains reserved registers: RSP [-Werror,-Winline-asm]
"syscall\n"
^
<inline asm>:1:1: note: instantiated into assembly here
syscall
^
.../lib/sanitizer_common/sanitizer_linux.cc:1214:24: note: Reserved registers on the clobber list may not be preserved across the asm statement, and clobbering them may lead to undefined behaviour.
"syscall\n"
^
<inline asm>:1:1: note: instantiated into assembly here
syscall
^
```
Removing `rsp` from the clobber list makes the warning go away, and does not
appear to have a functional impact. If there is another way to solve this, let
me know.
Reviewers: eugenis, vitalybuka
Reviewed By: eugenis
Subscribers: kubamracek, delcypher, llvm-commits, #sanitizers
Differential Revision: https://reviews.llvm.org/D50519
llvm-svn: 339370
As for Linux with its getrandom's syscall, giving the possibility to fill buffer with native call for good quality but falling back to /dev/urandom in worst case similarly.
Reviewers: vitalybuka, krytarowski
Reviewed By: vitalybuka
Differential Revision: https://reviews.llvm.org/D48804
llvm-svn: 339318
Summary:
We only run the 3rd check if 2nd check finds unstable edges.
3rd UpdateUnstableCounters is now merged with ApplyUnstableCounters to only run 1 iteration.
Patch by Kyungtak Woo (@kevinwkt).
Reviewers: Dor1s, metzman, morehouse
Reviewed By: Dor1s, morehouse
Subscribers: delcypher, #sanitizers, llvm-commits, kcc
Differential Revision: https://reviews.llvm.org/D50411
llvm-svn: 339249
Summary:
There may be cases in which a user wants to know which part of their code is unstable.
We use ObservedFuncs and UnstableCounters to print at exit which of the ObservedFunctions
are unstable under the -print_unstable_stats flag.
Patch by Kyungtak Woo (@kevinwkt).
Reviewers: Dor1s, metzman, morehouse
Reviewed By: Dor1s, metzman, morehouse
Subscribers: delcypher, #sanitizers, llvm-commits, kcc
Differential Revision: https://reviews.llvm.org/D50264
llvm-svn: 339081
Summary:
Added functions that calculate stats while fuzz targets are running and give
mutations weight based on how much new coverage they provide, and choose better
performing mutations more often.
Patch by Kodé Williams (@kodewilliams).
Reviewers: Dor1s, metzman, morehouse
Reviewed By: Dor1s, morehouse
Subscribers: delcypher, kcc, llvm-commits, #sanitizers
Differential Revision: https://reviews.llvm.org/D49621
llvm-svn: 338776
Summary:
This patch introduces `llvm_profile_set_dir_mode` and `llvm_profile_get_dir_mode` to
the compiler-rt profile API.
Originally, profile data was placed into a directory that was created with a hard-coded
mode value of 0755 (for non-win32 builds). In certain cases, it can be helpful to create
directories with a different mode other than 0755. This patch introduces set/get
routines to allow users to specify a desired mode. The default remains at 0755.
Reviewers: void, probinson
Reviewed By: probinson
Subscribers: probinson, dberris, cfe-commits
Differential Revision: https://reviews.llvm.org/D49953
llvm-svn: 338456
Summary:
This change provides access to the file header even in the in-memory
buffer processing. This allows in-memory processing of the buffers to
also check the version, and the format, of the profile data.
Reviewers: eizan, kpw
Reviewed By: eizan
Subscribers: llvm-commits
Differential Revision: https://reviews.llvm.org/D50037
llvm-svn: 338347
Summary:
Before my change, BlockingMutex used Windows critial sections. Critical
sections can only be initialized by calling InitializeCriticalSection,
dynamically.
The primary sanitizer allocator expects to be able to reinterpret zero
initialized memory as a BlockingMutex and immediately lock it.
RegionInfo contains a mutex, and it placement new is never called for
it. These objects are accessed via:
RegionInfo *GetRegionInfo(uptr class_id) const {
DCHECK_LT(class_id, kNumClasses);
RegionInfo *regions = reinterpret_cast<RegionInfo *>(SpaceEnd());
return ®ions[class_id];
}
The memory comes from the OS without any other initialization.
For various reasons described in the comments, BlockingMutex::Lock would
check if the object appeared to be zero-initialized, and it would lazily
call the LinkerInitialized constructor to initialize the critical
section. This pattern is obviously racy, and the code had a bunch of
FIXMEs about it.
The best fix here is to use slim reader writer locks, which can start
out zero-initialized. They are available starting in Windows Vista. I
think it's safe to go ahead and use them today.
Reviewers: kcc, vitalybuka
Subscribers: kubamracek, llvm-commits
Differential Revision: https://reviews.llvm.org/D49893
llvm-svn: 338331
Summary:
rL325492 disables FPU features when using soft floating point
(-mfloat-abi=soft), which is used internally when building for arm. This causes
errors with builtins that utililize VFP instructions.
With this change we check if VFP is enabled (by checking if the preprocessor
macro __VFP_FP__ is defined), and exclude such builtins if it is not enabled.
Reviewers: rengolin, samsonov, compnerd, smeenai, javed.absar, peter.smith
Reviewed By: peter.smith
Subscribers: delcypher, peter.smith, mgorny, kristof.beyls, chrib, llvm-commits
Differential Revision: https://reviews.llvm.org/D47217
llvm-svn: 338284
Summary:
This change moves FDR mode to use `internal_mmap(...)` from
sanitizer_common instead of the internal allocator interface. We're
doing this to sidestep the alignment issues we encounter with the
`InternalAlloc(...)` functions returning pointers that have some magic
bytes at the beginning.
XRay copies bytes into the buffer memory, and does not require the magic
bytes tracking the other sanitizers use when allocating/deallocating
buffers.
Reviewers: kpw, eizan
Subscribers: llvm-commits
Differential Revision: https://reviews.llvm.org/D49972
llvm-svn: 338228
0x22000000 happens to be on the left of a heap allocation and the error
message is different (heap-buffer-overflow).
FreeBSD NetBSD have larger SHADOW_OFFSET (0x40000000) but let's try not
using #ifdef here.
llvm-svn: 338208
This ports the profiling runtime on Fuchsia and enables the
instrumentation. Unlike on other platforms, Fuchsia doesn't use
files to dump the instrumentation data since on Fuchsia, filesystem
may not be accessible to the instrumented process. We instead use
the data sink to pass the profiling data to the system the same
sanitizer runtimes do.
Differential Revision: https://reviews.llvm.org/D47208
llvm-svn: 337881
Summary:
Added a new mode within flag -handle_unstable for new unstable handling algorithm that does the following:
When an edge is shown as unstable, copy to UnstableCounters the value 0.
During ApplyUnstableCounters we copy back the value 0 to ModuleInline8bitCounters if the edge was unstable.
This way we would be ignoring completely features that were collected through non-determinism.
Unstable hits would be counted as if it never hit.
Reviewers: metzman, Dor1s, kcc, morehouse
Reviewed By: metzman, morehouse
Subscribers: delcypher, llvm-commits, #sanitizers
Differential Revision: https://reviews.llvm.org/D49684
llvm-svn: 337853
Objective-C tagged pointers (either bottom-most or top-most bit is 1) are valid Obj-C objects but are not valid pointers. Make sure we don't crash on them when used in objc_sync_enter/objc_sync_exit. Instead, let's synchronize on a global object.
Differential Revision: https://reviews.llvm.org/D49707
llvm-svn: 337837
Until now, our code preferred backslashes to slashes, whereas Windows
allows using both types of directory separators in one path string.
Differential Revision: https://reviews.llvm.org/D49664
llvm-svn: 337826
This is a preparation for breaking change when all Zircon calls that
take time as an argument will start using signed valued. We will
transition back to ZX_TIME_INFITINE after all the changes to these
symbols are done and become part of the Fuchsia SDK.
Differential Revision: https://reviews.llvm.org/D49694
llvm-svn: 337802
This is a preparation for breaking changes to _zx_vmar_... calls.
We will transition back to _zx_vmar_... after all the changes to
these symbols are done and become part of the Fuchsia SDK.
Differential Revision: https://reviews.llvm.org/D49697
llvm-svn: 337801
The path to headers which are installed into libc++ build directory
has changed in r337727 which broke the libFuzzer build.
Differential Revision: https://reviews.llvm.org/D49705
llvm-svn: 337775
Summary:
Created unstable_handle flag that takes 1 or 2, depending on the handling type.
Modified RunOne to accommodate the following heuristic:
Use the first CollectFeatures to count how many features there are.
If no new features, CollectFeatures like before.
If there is new feature, we run CB 2 more times,
Check which edges are unstable per input and we store the least amount of hit counts for each edge.
Apply these hit counts back to inline8bitcounters so that CollectFeatures can work as intended.
Modified UnstableCounters to 8int_t and created a bitset UnstableSet to tell which edges are unstable.
Patch by Kyungtak Woo (@kevinwkt).
Reviewers: Dor1s, metzman, morehouse
Reviewed By: Dor1s, morehouse
Subscribers: delcypher, #sanitizers, llvm-commits, kcc
Differential Revision: https://reviews.llvm.org/D49525
llvm-svn: 337696
When shadow stack from Intel CET is enabled, the first instruction of all
indirect branch targets must be a special instruction, ENDBR.
lib/asan/asan_interceptors.cc has
...
int res = REAL(swapcontext)(oucp, ucp);
...
REAL(swapcontext) is a function pointer to swapcontext in libc. Since
swapcontext may return via indirect branch on x86 when shadow stack is
enabled, as in this case,
int res = REAL(swapcontext)(oucp, ucp);
^^^^^^^^^^^^^^^^^^^^^^^^^^^^ This function may be
returned via an indirect branch.
Here compiler must insert ENDBR after call, like
call *bar(%rip)
endbr64
I opened an LLVM bug:
https://bugs.llvm.org/show_bug.cgi?id=38207
to add the indirect_return attribute so that it can be used to inform
compiler to insert ENDBR after REAL(swapcontext) call. We mark
REAL(swapcontext) with the indirect_return attribute if it is available.
This fixed:
https://bugs.llvm.org/show_bug.cgi?id=38249
Reviewed By: eugenis
Differential Revision: https://reviews.llvm.org/D49608
llvm-svn: 337603
`VM_MEMORY_SANITIZER`.
It turns out that `VM_MEMORY_ANALYSIS_TOOL` is already reserved for
use by other tools so switch to a tag reserved for use by the Sanitizers.
rdar://problem/41969783
Differential Revision: https://reviews.llvm.org/D49603
llvm-svn: 337579
Summary:
There is currently too much redundancy in the class/variable/* names in Scudo:
- we are in the namespace `__scudo`, so there is no point in having something
named `ScudoX` to end up with a final name of `__scudo::ScudoX`;
- there are a lot of types/* that have `Allocator` in the name, given that
Scudo is an allocator I figure this doubles up as well.
So change a bunch of the Scudo names to make them shorter, less redundant, and
overall simpler. They should still be pretty self explaining (or at least it
looks so to me).
The TSD part will be done in another CL (eg `__scudo::ScudoTSD`).
Reviewers: alekseyshl, eugenis
Reviewed By: alekseyshl
Subscribers: delcypher, #sanitizers, llvm-commits
Differential Revision: https://reviews.llvm.org/D49505
llvm-svn: 337557
r337531 changed return type of MmapFixedNoReserve, but esan wasn't updated.
As the result esan shadow setup always fails.
We probably need to make MmapFixedNoAccess signature consistent
with MmapFixedNoReserve. But this is just to unbreak tests.
llvm-svn: 337550
MmapFixedNoReserve does not terminate process on failure.
Failure to check its result and die will always lead to harder
to debug crashes later in execution. This was observed in Go
processes due to some address space conflicts.
Consistently check result of MmapFixedNoReserve.
While we are here also add warn_unused_result attribute
to prevent such bugs in future and change return type to bool
as that's what all callers want.
Reviewed in https://reviews.llvm.org/D49367
llvm-svn: 337531
Summary:
Add __llvm_profile_get_filename interface to get the profile filename,
which can be used for identifying which profile file belongs to an app
when multiple binaries are instrumented and dumping profiles into the
same directory. The filename includes the path.
Reviewers: davidxl
Subscribers: delcypher, #sanitizers, llvm-commits
Differential Revision: https://reviews.llvm.org/D49529
llvm-svn: 337482
This change makes it so that the profiling mode implementation will only
write files when there are buffers to write. Before this change, we'd
always open a file even if there were no profiles collected when
flushing.
llvm-svn: 337443
When providing raw access to the FDR mode buffers, we used to not
include the extents metadata record. This oversight means that
processing the buffers in-memory will lose important information that
would have been written in files.
This change exposes the metadata record by serializing the data
similarly to how we would do it when flushing to files.
llvm-svn: 337441
MAP_NORESERVE is not supported or a no-op on BSD.
Reviewers: dberris
Reviewed By: dberris
Differential Revision: https://reviews.llvm.org/D49494
llvm-svn: 337440
Fuchsia doesn't have signals; instead it expects processes to have a
dedicated exception thread that binds to the process' exception port and
waits for exception packets to be delivered. On the other hand,
libFuzzer and sanitizer_common use expect to collect crash information
via libunwind from the same thread that caused the exception.
The long term fix is to improve support for remote unwinding in
libunbwind, plumb this through sanitizer_common and libFuzzer, and
handle the exception exclusively on the exception thread. In the
meantime, this revision has the exception thread "resurrect" the
crashing thread by:
* saving its general purpose register state onto the crashing thread's
stack,
* setting the crashing thread's program counter to an assembly trampoline
with the CFI information needed by libunwind, and
* resuming the crashed thread.
Patch By: aarongreen
Differential Revision: https://reviews.llvm.org/D48509
llvm-svn: 337418
Summary:
Created IterateInline8bitCounters, a single template for visiting Inline8bitCounters (nested for loop)
Made InitializeUnstableCounters and UpdateUnstableCounters both send a lambda to IterateInline8bitCounters.
Patch by Kyungtak Woo (@kevinwkt).
Reviewers: Dor1s, metzman, kcc, morehouse
Reviewed By: metzman, morehouse
Subscribers: delcypher, llvm-commits, #sanitizers
Differential Revision: https://reviews.llvm.org/D49453
llvm-svn: 337403
Summary:
This is a follow-on to D49217 which simplifies and optimises the
implementation of the segmented array. In this patch we co-locate the
book-keeping for segments in the `__xray::Array<T>` with the data it's
managing. We take the chance in this patch to actually rename `Chunk` to
`Segment` to better align with the high-level description of the
segmented array.
With measurements using benchmarks landed in D48879, we've identified
that calls to `pthread_getspecific` started dominating the cycles, which
led us to revert the change made in D49217 to use C++ thread_local
initialisation instead (it reduces the cost by a huge margin, since we
save one PLT-based call to pthread functions in the hot path). In
particular, this is in `__xray::getThreadLocalData()`.
We also took the opportunity to remove the least-common-multiple based
calculation and instead pack as much data into segments of the array.
This greatly simplifies the API of the container which hides as much of
the implementation details as possible. For instance, we calculate the
number of elements we need for the each segment internally in the Array
instead of making it part of the type.
With the changes here, we're able to get a measurable improvement on the
performance of profiling mode on top of what D48879 already provides.
Depends on D48879.
Reviewers: kpw, eizan
Subscribers: llvm-commits
Differential Revision: https://reviews.llvm.org/D49363
llvm-svn: 337343
Summary:
This change simplifies the XRay Allocator implementation to self-manage
an mmap'ed memory segment instead of using the internal allocator
implementation in sanitizer_common.
We've found through benchmarks and profiling these benchmarks in D48879
that using the internal allocator in sanitizer_common introduces a
bottleneck on allocating memory through a central spinlock. This change
allows thread-local allocators to eliminate contention on the
centralized allocator.
To get the most benefit from this approach, we also use a managed
allocator for the chunk elements used by the segmented array
implementation. This gives us the chance to amortize the cost of
allocating memory when creating these internal segmented array data
structures.
We also took the opportunity to remove the preallocation argument from
the allocator API, simplifying the usage of the allocator throughout the
profiling implementation.
In this change we also tweak some of the flag values to reduce the
amount of maximum memory we use/need for each thread, when requesting
memory through mmap.
Depends on D48956.
Reviewers: kpw, eizan
Subscribers: llvm-commits
Differential Revision: https://reviews.llvm.org/D49217
llvm-svn: 337342
Summary:
Fix a bug in FDR mode which didn't allow for re-initialising the logging
in the same process. This change ensures that:
- When we flush the FDR mode logging, that the state of the logging
implementation is `XRAY_LOG_UNINITIALIZED`.
- Fix up the thread-local initialisation to use aligned storage and
`pthread_getspecific` as well as `pthread_setspecific` for the
thread-specific data.
- Actually use the pointer provided to the thread-exit cleanup handling,
instead of assuming that the thread has thread-local data associated
with it, and reaching at thread-exit time.
In this change we also have an explicit test for two consecutive
sessions for FDR mode tracing, and ensuring both sessions succeed.
Reviewers: kpw, eizan
Subscribers: llvm-commits
Differential Revision: https://reviews.llvm.org/D49359
llvm-svn: 337341
Summary:
Code now exists to track number of mutations that are used in fuzzing in total
and ones that produce new coverage. The stats are currently being dumped to the
command line.
Patch by Kodé Williams (@kodewilliams).
Reviewers: metzman, Dor1s, morehouse, kcc
Reviewed By: Dor1s, morehouse, kcc
Subscribers: delcypher, kubamracek, kcc, morehouse, llvm-commits, #sanitizers, mgorny
Differential Revision: https://reviews.llvm.org/D48054
llvm-svn: 337324
This function is available for linking in from kernel32.dll, but
it's not allowed to link that function from there in Windows Store
apps.
Differential Revision: https://reviews.llvm.org/D49055
llvm-svn: 337313
This is a fix for bug 37047.
https://bugs.llvm.org/show_bug.cgi?id=37047
Implemented by basically reversing the logic. Previously all strings
were considered, with some operations excluded. Now strings are excluded
by default, and only strings during the CB considered.
Patch By: pdknsk
Differential Revision: https://reviews.llvm.org/D48800
llvm-svn: 337296
We no longer pass CLANG_DEFAULT_CXX_STDLIB to the runtimes build
as it was causing issues so we can no longer use this variable. We
instead use cxx-headers as a dependency whenever this is available
since both XRay and libFuzzer are built as static libraries so this
is sufficient.
Differential Revision: https://reviews.llvm.org/D49346
llvm-svn: 337199
Summary:
Code now exists to track number of mutations that are used in fuzzing in total
and ones that produce new coverage. The stats are currently being dumped to the
command line.
Patch by Kodé Williams (@kodewilliams).
Reviewers: metzman, Dor1s, morehouse, kcc
Reviewed By: Dor1s, morehouse, kcc
Subscribers: delcypher, kubamracek, kcc, morehouse, llvm-commits, #sanitizers, mgorny
Differential Revision: https://reviews.llvm.org/D48054
llvm-svn: 337194
Summary:
Created a -print_unstable_stats flag.
When -print_unstable_stats=1, we run it 2 more times on interesting inputs poisoning unstable edges in an array.
On program termination, we run PrintUnstableStats() which will print a line with a stability percentage like AFL does.
Patch by Kyungtak Woo (@kevinwkt).
Reviewers: metzman, Dor1s, kcc, morehouse
Reviewed By: metzman, Dor1s, morehouse
Subscribers: delcypher, llvm-commits, #sanitizers, kcc, morehouse, Dor1s
Differential Revision: https://reviews.llvm.org/D49212
llvm-svn: 337187
Summary:
Created a -print_unstable_stats flag.
When -print_unstable_stats=1, we run it 2 more times on interesting inputs poisoning unstable edges in an array.
On program termination, we run PrintUnstableStats() which will print a line with a stability percentage like AFL does.
Patch by Kyungtak Woo (@kevinwkt).
Reviewers: metzman, Dor1s, kcc, morehouse
Reviewed By: metzman, Dor1s, morehouse
Subscribers: delcypher, llvm-commits, #sanitizers, kcc, morehouse, Dor1s
Differential Revision: https://reviews.llvm.org/D49212
llvm-svn: 337175
Summary:
Fix a TODO in CMake config for XRay tests to use the detected C++ ABI
library in the tests.
Also make the tests depend on the llvm-xray target when built in-tree.
Reviewers: kpw, eizan
Reviewed By: eizan
Subscribers: mgorny, llvm-commits
Differential Revision: https://reviews.llvm.org/D49358
llvm-svn: 337142
Summary:
That flag has been introduced in https://reviews.llvm.org/D48660 for
suppressing UIO error messages in an efficient way. The main motivation is to
be able to use UIO checks in builds used for fuzzing as it might provide an
interesting signal to a fuzzing engine such as libFuzzer.
See https://github.com/google/oss-fuzz/issues/910 for more information.
Reviewers: morehouse, kcc
Reviewed By: morehouse
Subscribers: kubamracek, delcypher, #sanitizers, llvm-commits
Differential Revision: https://reviews.llvm.org/D49324
llvm-svn: 337068
Summary:
Introduce built-ins to read the unsafe stack top and bottom. The unsafe
stack top is required to implement garbage collection scanning for
Oilpan. Currently there is already a built-in 'get_unsafe_stack_start'
to read the bottom of the unsafe stack, but I chose to duplicate this
API because 'start' is ambiguous (e.g. Oilpan uses WTF::GetStackStart to
read the safe stack top.)
Reviewers: pcc
Reviewed By: pcc
Subscribers: llvm-commits, kcc
Differential Revision: https://reviews.llvm.org/D49152
llvm-svn: 337037
Summary:
Use `-Wl,-z,global` for all Sanitizer shared libraries on
Android. We want them to be in the global group
(https://android.googlesource.com/platform/bionic/+/master/android-changes-for-ndk-developers.md#changes-to-library-search-order)
to avoid any alloc/dealloc mismatch between the libc allocator & said library.
`audioserver` was one of the binary that exhibited the problem with Scudo,
this seems to fix it.
[edited for accuracy]
Reviewers: eugenis, alekseyshl
Reviewed By: eugenis
Subscribers: kubamracek, srhines, mgorny, delcypher, #sanitizers, llvm-commits
Differential Revision: https://reviews.llvm.org/D49198
llvm-svn: 337010
Summary:
llvm-xray changes:
- account-mode - process-id {...} shows after thread-id
- convert-mode - process {...} shows after thread
- parses FDR and basic mode pid entries
- Checks version number for FDR log parsing.
Basic logging changes:
- Update header version from 2 -> 3
FDR logging changes:
- Update header version from 2 -> 3
- in writeBufferPreamble, there is an additional PID Metadata record (after thread id record and tsc record)
Test cases changes:
- fdr-mode.cc, fdr-single-thread.cc, fdr-thread-order.cc modified to catch process id output in the log.
Reviewers: dberris
Reviewed By: dberris
Subscribers: hiraditya, llvm-commits, #sanitizers
Differential Revision: https://reviews.llvm.org/D49153
llvm-svn: 336974
Summary:
This change adds support for writing out profiles at program exit.
Depends on D48653.
Reviewers: kpw, eizan
Reviewed By: kpw
Subscribers: llvm-commits
Differential Revision: https://reviews.llvm.org/D48956
llvm-svn: 336969
The list duplicates information already available in the parent
directory so use that instead. It is unclear to me why we need
to spell out the dependencies explicitly but fixing that should
be done in a separate patch.
Differential Revision: https://reviews.llvm.org/D49177
llvm-svn: 336905
The variable name `SANITIZER_HEADERS` is already used for the list of
public headers in `include/CMakeLists.txt`. Although the previous
implementation worked it's probably best to avoid shadowing global
variables to avoid confusion.
Differential Revision: https://reviews.llvm.org/D49176
llvm-svn: 336904
Summary:
The write buffer contains signed chars, which means the shift operations caused values such as the arc tag value (0x01a10000) to be read incorrectly (0xffa10000).
This fixes a regression from https://reviews.llvm.org/D49132.
Reviewers: uweigand, davidxl
Reviewed By: uweigand
Subscribers: llvm-commits, #sanitizers
Differential Revision: https://reviews.llvm.org/D49161
llvm-svn: 336775
Summary: XRayRecords now includes a PID field. Basic handlers fetch pid and tid each time they are called instead of caching the value. Added a testcase that calls fork and checks if the child TID is different from the parent TID to verify that the processes' TID are different in the trace.
Reviewers: dberris, Maknee
Reviewed By: dberris, Maknee
Subscribers: kpw, llvm-commits, #sanitizers
Differential Revision: https://reviews.llvm.org/D49025
llvm-svn: 336769
This reverts rL334510 due to breakage of afl_driver's command line
interface.
Patch By: Jonathan Metzman
Differential Revision: https://reviews.llvm.org/D49141
llvm-svn: 336719
It turns out that the `${XRAY_HEADERS}` CMake variable was already
in use and was used for public headers. It seems that
`lib/xray/tests/CMakeLists.txt` was depending on this.
To fix rename the new `${XRAY_HEADERS}` to `${XRAY_IMPL_HEADERS}`.
llvm-svn: 336699
Two fixes required to handle big-endian systems:
- 64-bit counter values are stored in a mixed-endian format in the
gcov files: a 32-bit low-part followed by a 32-bit high part. Note that
this is already implemented correctly on the LLVM side, see
GCOVBuffer::readInt64.
- The tag values (e.g. arcs tag, object summary tag, ...) are aways
written as the same sequence of bytes independent of byte order. But
when *reading* them back in, the code reads them as 32-bit values in
host byte order. For the comparisons to work correctly, this should
instead always read them as little-endian values.
Fixes PR 38121.
Reviewed By: marco-c
Differential Revision: https://reviews.llvm.org/D49132
llvm-svn: 336693
when building with an IDE so that header files show up in the UI.
This massively improves the development workflow in IDEs.
To implement this a new function `compiler_rt_process_sources(...)` has
been added that adds header files to the list of sources when the
generator is an IDE. For non-IDE generators (e.g. Ninja/Makefile) no
changes are made to the list of source files.
The function can be passed a list of headers via the
`ADDITIONAL_HEADERS` argument. For each runtime library a list of
explicit header files has been added and passed via
`ADDITIONAL_HEADERS`. For `tsan` and `sanitizer_common` a list of
headers was already present but it was stale and has been updated
to reflect the current state of the source tree.
The original version of this patch used file globbing (`*.{h,inc,def}`)
to find the headers but the approach was changed due to this being a
CMake anti-pattern (if the list of headers changes CMake won't
automatically re-generate if globbing is used).
The LLVM repo contains a similar function named `llvm_process_sources()`
but we don't use it here for several reasons:
* It depends on the `LLVM_ENABLE_OPTION` cache variable which is
not set in standalone compiler-rt builds.
* We would have to `include(LLVMProcessSources)` which I'd like to
avoid because it would include a bunch of stuff we don't need.
Differential Revision: https://reviews.llvm.org/D48422
llvm-svn: 336663
Changes:
- Remove static assertion on size of a structure, fails on systems where
pointers aren't 8 bytes.
- Use size_t instead of deducing type of arguments to
`nearest_boundary`.
Follow-up to D48653.
llvm-svn: 336648
Summary:
We found a bug while working on a benchmark for the profiling mode which
manifests as a segmentation fault in the profiling handler's
implementation. This change adds unit tests which replicate the
issues in isolation.
We've tracked this down as a bug in the implementation of the Freelist
in the `xray::Array` type. This happens when we trim the array by a
number of elements, where we've been incorrectly assigning pointers for
the links in the freelist of chunk nodes. We've taken the chance to add
more debug-only assertions to the code path and allow us to verify these
assumptions in debug builds.
In the process, we also took the opportunity to use iterators to
implement both `front()` and `back()` which exposes a bug in the
iterator decrement operation. In particular, when we decrement past a
chunk size boundary, we end up moving too far back and reaching the
`SentinelChunk` prematurely.
This change unblocks us to allow for contributing the non-crashing
version of the benchmarks in the test-suite as well.
Reviewers: kpw
Subscribers: mgorny, llvm-commits
Differential Revision: https://reviews.llvm.org/D48653
llvm-svn: 336644
Code now exists to track number of mutations that are used in fuzzing in
total and ones that produce new coverage. The stats are currently being
dumped to the command line.
Patch By: Kode Williams
Differntial Revision: https://reviews.llvm.org/D48054
llvm-svn: 336597
Summary:
- use proper Error() decorator for error messages
- refactor ASan thread id and name reporting
Reviewers: eugenis
Subscribers: kubamracek, delcypher, #sanitizers, llvm-commits
Differential Revision: https://reviews.llvm.org/D49044
llvm-svn: 336573
Summary: This is a minor cosmetic change. When function/path exceed ~1000 characters, the output is truncated before the line-break. I noticed this for NEW_FUNC.
Reviewers: kcc
Reviewed By: kcc
Subscribers: llvm-commits, #sanitizers
Differential Revision: https://reviews.llvm.org/D48799
llvm-svn: 336461
Summary:
Namely, set the abort message, and allow to write the message to syslog if the
option is enabled.
Reviewers: alekseyshl
Reviewed By: alekseyshl
Subscribers: delcypher, #sanitizers, llvm-commits
Differential Revision: https://reviews.llvm.org/D48902
llvm-svn: 336445
Summary:
This will make the behavior of __gcov_flush match the GCC behavior.
I would like to rename __gcov_flush to __llvm_gcov_flush (in case of programs linking to libraries built with different compilers), but I guess we can't for compatibility reasons.
Reviewers: davidxl
Reviewed By: davidxl
Subscribers: samsonov, vitalybuka, pcc, kcc, junbuml, glider, fhahn, eugenis, dvyukov, davidxl, srhines, chh, llvm-commits, #sanitizers
Differential Revision: https://reviews.llvm.org/D48538
llvm-svn: 336365
Summary:
The C interceptors were using `SIZE_T` defined in the interception library as
a `__sanitizer::uptr`. On some 32-bit platforms, this lead to the following
warning:
```
warning: declaration of ‘void* malloc(SIZE_T)’ conflicts with built-in declaration ‘void* malloc(unsigned int)’ [-Wbuiltin-declaration-mismatch]
INTERCEPTOR_ATTRIBUTE void *malloc(SIZE_T size) {
```
`__sanitizer::uptr` is indeed defined as an `unsigned long` on those.
So just include `stddef.h` and use `size_t` instead.
Reviewers: alekseyshl
Reviewed By: alekseyshl
Subscribers: delcypher, llvm-commits, #sanitizers
Differential Revision: https://reviews.llvm.org/D48885
llvm-svn: 336221
Summary:
It would be useful for Flutter apps, especially, to be able to use
malloc hooks to debug memory leaks on Fuchsia. They're not able to do
this right now, so it'd be a nice bonus to throw in with the Scudo
switchover.
Reviewers: cryptoad, alekseyshl
Reviewed By: cryptoad
Differential Revision: https://reviews.llvm.org/D48618
llvm-svn: 336139
Summary:
Without this patch,
clang -fsanitize=address -xc =(printf 'int main(){}') -o a; ./a => deadlock in __asan_init>AsanInitInternal>AsanTSDInit>...>__getcontextx_size>_rtld_bind>rlock_acquire(rtld_bind_lock, &lockstate)
libexec/rtld-elf/rtld.c
wlock_acquire(rtld_bind_lock, &lockstate);
if (obj_main->crt_no_init)
preinit_main(); // unresolved PLT functions cannot be called here
lib/libthr/thread/thr_rtld.c
uc_len = __getcontextx_size(); // unresolved PLT function in libthr.so.3
check-xray tests currently rely on .preinit_array so we special case in
xray_init.cc
Subscribers: srhines, kubamracek, krytarowski, delcypher, llvm-commits, #sanitizers
Differential Revision: https://reviews.llvm.org/D48806
llvm-svn: 336067
Currently in FreeBSD 12.0-CURRENT with trunk clang+compiler-rt, faulty -fsanitize=address executable hangs at 'urdlck' state.
Ka Ho Ng has verified that by backporting this to llvm 6.0.1, with use_madv_dontdump=1, shadow memory is not dumped.
ASAN_OPTIONS=abort_on_error=1:disable_coredump=0:use_madv_dontdump=1 ./a
Reviewers: dimitry, kcc, dvyukov, emaste, khng300
Subscribers: kubamracek, delcypher, llvm-commits, #sanitizers
Differential Revision: https://reviews.llvm.org/D48257
llvm-svn: 336046
__gcov_flush is hidden.
For applications to dump profiling data of selected .so files,
they can use dlsym to find and call llvm_gcov_flush in each .so file.
Differential Revision: https://reviews.llvm.org/D45454
llvm-svn: 336019
Summary:
Report errno value on failed shadow memory madvise attempt and add a
hint message with the possible workaround.
Reviewers: eugenis
Subscribers: kubamracek, delcypher, #sanitizers, llvm-commits
Differential Revision: https://reviews.llvm.org/D48668
llvm-svn: 335928
Summary:
Setting UBSAN_OPTIONS=silence_unsigned_overflow=1 will silence all UIO
reports. This feature, combined with
-fsanitize-recover=unsigned-integer-overflow, is useful for providing
fuzzing signal without the excessive log output.
Helps with https://github.com/google/oss-fuzz/issues/910.
Reviewers: kcc, vsk
Reviewed By: vsk
Subscribers: vsk, kubamracek, Dor1s, llvm-commits
Differential Revision: https://reviews.llvm.org/D48660
llvm-svn: 335762
build with an IDE (e.g. Xcode) as the generator.
Previously the global `USE_FOLDERS` property wasn't set in standalone
builds leading to existing settings of FOLDER not being respected.
In addition to this there were several targets that appeared at the top
level that were not interesting and clustered up the view. These have
been changed to be displayed in "Compiler-RT Misc".
Now when an Xcode project is generated from a standalone compiler-rt
build the project navigator is much less cluttered. The interesting
libraries should appear in "Compiler-RT Libraries" in the IDE.
Differential Revision: https://reviews.llvm.org/D48378
llvm-svn: 335728
Some warnings originating from googletest were causing bots to fail
while bulding unit tests. The sanitizers address this issue by not
using -Werror. We adopt this approach for libFuzzer.
llvm-svn: 335640
Similarly to CFI on virtual and indirect calls, this implementation
tries to use program type information to make the checks as precise
as possible. The basic way that it works is as follows, where `C`
is the name of the class being defined or the target of a call and
the function type is assumed to be `void()`.
For virtual calls:
- Attach type metadata to the addresses of function pointers in vtables
(not the functions themselves) of type `void (B::*)()` for each `B`
that is a recursive dynamic base class of `C`, including `C` itself.
This type metadata has an annotation that the type is for virtual
calls (to distinguish it from the non-virtual case).
- At the call site, check that the computed address of the function
pointer in the vtable has type `void (C::*)()`.
For non-virtual calls:
- Attach type metadata to each non-virtual member function whose address
can be taken with a member function pointer. The type of a function
in class `C` of type `void()` is each of the types `void (B::*)()`
where `B` is a most-base class of `C`. A most-base class of `C`
is defined as a recursive base class of `C`, including `C` itself,
that does not have any bases.
- At the call site, check that the function pointer has one of the types
`void (B::*)()` where `B` is a most-base class of `C`.
Differential Revision: https://reviews.llvm.org/D47567
llvm-svn: 335569
Speculative fix for the interface definition of __ubsan_on_report for
the Windows bots:
http://lab.llvm.org:8011/builders/sanitizer-windows/builds/30528
lib\ubsan\ubsan_interface.inc(55): error C2065: '__ubsan_on_report':
undeclared identifier
INTERCEPT_SANITIZER_WEAK_FUNCTION was the wrong macro to use to begin
with because __ubsan_on_report isn't weak. Reading through that macro,
it's still not clear to me why there is an undefined reference, though,
because it appears to define a dummy __ubsan_on_report shim.
llvm-svn: 335383
Add support to the ubsan runtime for reporting diagnostics to a monitor
process (e.g a debugger).
The Xcode IDE uses this by setting a breakpoint on __ubsan_on_report and
collecting diagnostic information via __ubsan_get_current_report_data,
which it then surfaces to users in the editor UI.
Testing for this functionality already exists in upstream lldb, here:
lldb/packages/Python/lldbsuite/test/functionalities/ubsan
Apart from that, this is `ninja check-{a,ub}san` clean.
Differential Revision: https://reviews.llvm.org/D48446
llvm-svn: 335371
MutexUnlock uses ReleaseStore on s->clock, which is the right thing to do.
However MutexReadOrWriteUnlock for writers uses Release on s->clock.
Make MutexReadOrWriteUnlock also use ReleaseStore for consistency and performance.
Unfortunately, I don't think any test can detect this as this only potentially
affects performance.
llvm-svn: 335322
Summary:
This patch follows D48373.
The point is to be able to use Scudo with `-fsanitize-minimal-runtime`. For that
we need a runtime that doesn't embed the UBSan one. This results in binaries
that can be compiled with `-fsanitize=scudo,integer -fsanitize-minimal-runtime`.
Reviewers: eugenis
Reviewed By: eugenis
Subscribers: mgorny, delcypher, llvm-commits, #sanitizers
Differential Revision: https://reviews.llvm.org/D48377
llvm-svn: 335296
Similarly to Msan adding -pie provokes linkage issue, was spotted with pie_test.cc
Set to XFAIL for couple of unit tests.
Reviewers: vitalybuka, krytarowski, dim
Reviewed By: vitalybuka
Differential Revision: https://reviews.llvm.org/D48317
llvm-svn: 335166
Intercepts thr_exit call on FreeBSD.
Disable pthread key workflow.
The pthread key create approach does not function under FreeBSD as the libpthread is not initialised enough at this stage.
Reviewers: vitalybuka, krytarowski, dim
Reviewed By: vitalybuka
Differential Revision: https://reviews.llvm.org/D48268
llvm-svn: 335164
Summary:
Remove the generic error nadling policies and handle each allocator error
explicitly. Although more verbose, it allows for more comprehensive, precise
and actionable allocator related failure reports.
This finishes up the series of changes of the particular sanitizer
allocators, improves the internal allocator error reporting and removes
now unused policies.
Reviewers: vitalybuka, cryptoad
Subscribers: kubamracek, delcypher, #sanitizers, llvm-commits
Differential Revision: https://reviews.llvm.org/D48328
llvm-svn: 335147
Summary:
Mark `isRssLimitExceeded` as `NOINLINE`, and move it's definition as well as
the one of `performSanityChecks` out of the class definition, as requested.
Reviewers: filcab, alekseyshl
Reviewed By: alekseyshl
Subscribers: delcypher, #sanitizers, llvm-commits
Differential Revision: https://reviews.llvm.org/D48228
llvm-svn: 335054
The initial implementaiton was using the C++ typeof keyword. This
causes the compiler to spew warnings unnecissarilly. This patch removes
the uses of typeof and replaces them with explicit typedefs of the
function types.
llvm-svn: 334981
Summary:
Following up on and complementing D44404 and other sanitizer allocators.
Currently many allocator specific errors (OOM, for example) are reported as
a text message and CHECK(0) termination, no stack, no details, not too
helpful nor informative. To improve the situation, detailed and structured
common errors were defined and reported under the appropriate conditions.
Common tests were generalized a bit to cover a slightly different TSan
stack reporting format, extended to verify errno value and returned
pointer value check is now explicit to facilitate debugging.
Reviewers: dvyukov
Subscribers: srhines, kubamracek, delcypher, #sanitizers, llvm-commits
Differential Revision: https://reviews.llvm.org/D48087
llvm-svn: 334975
On targets that don't link internal libc++ (Fuchsia and Linux) but
use libc++ as their C++ library and libFuzzer is being built using
the just built compiler together with libc++ as part of runtimes, we
need an explicit dependency from libFuzzer object library to libc++ to
make sure the headers are available by the time we start building
libFuzzer.
Differential Revision: https://reviews.llvm.org/D48261
llvm-svn: 334928
Summary: Otherwise if the file existed and was larger than the write size before the OpenFile call, the file will not be truncated and contain garbage in trailing bytes.
Reviewers: glider, kcc, vitalybuka
Subscribers: kubamracek, delcypher, llvm-commits, #sanitizers
Differential Revision: https://reviews.llvm.org/D48250
llvm-svn: 334881
Don't hardcode the architecture for Fuzzer tests which breaks when
compiler-rt is being compiled for architectures other than x86_64.
Differential Revision: https://reviews.llvm.org/D48207
llvm-svn: 334852
Summary:
The current `FailureHandler` mechanism was fairly opaque with regard to the
failure reason due to using `CHECK(0)`. Scudo is a bit different from the other
Sanitizers as it prefers to avoid spurious processing in its failure path. So
we just `dieWithMessage` using a somewhat explicit string.
Adapted the tests for the new strings.
While this takes care of the `OnBadRequest` & `OnOOM` failures, the next step
is probably to migrate the other Scudo failures in the same failes (header
corruption, invalid state and so on).
Reviewers: alekseyshl
Reviewed By: alekseyshl
Subscribers: filcab, mgorny, delcypher, #sanitizers, llvm-commits
Differential Revision: https://reviews.llvm.org/D48199
llvm-svn: 334843
The locks need to be implemented in a shared library to work correctly,
so they shouldn't be part of libclang_rt.builtins.a, except in
specialized scenarios where the user can prove it will only be linked
once.
Differential Revision: https://reviews.llvm.org/D47606
llvm-svn: 334779
Summary:
static fallback_mutex in msan_allocator.cc does not need the ctor
call and can be linker initialized.
Issue: https://github.com/google/sanitizers/issues/194
Reviewers: morehouse, eugenis
Subscribers: delcypher, #sanitizers, llvm-commits
Differential Revision: https://reviews.llvm.org/D48145
llvm-svn: 334749
Summary:
Static ScopedInErrorReport::current_error_ can be linker initialized to
shave one global ctor call on application startup and be __asan_init-safe.
Global constructors in ASan runtime are bad because __asan_init runs
from preinit_array, before any such constructors.
Issue: https://github.com/google/sanitizers/issues/194
Reviewers: eugenis, morehouse
Subscribers: kubamracek, delcypher, #sanitizers, llvm-commits
Differential Revision: https://reviews.llvm.org/D48141
llvm-svn: 334748
Glob patterns seem unsupported for commands executed by the emulated
shell (LIT_USE_INTERNAL_SHELL=1). Disable the test while that is being
addressed (a workaround such as "cd a-*" also does not work).
llvm-svn: 334719
Summary:
As a follow up to D48142 for Scudo, switch the `SpinMutex` to its static
counterpart, and ensure zero-initialization by memset'ing the whole class.
Reviewers: alekseyshl
Reviewed By: alekseyshl
Subscribers: delcypher, #sanitizers, llvm-commits
Differential Revision: https://reviews.llvm.org/D48148
llvm-svn: 334716
Summary:
Error messages for dlsym used to be stored on the stack, but since
commit 2449ae7b ("ld.so: Introduce struct dl_exception") in glibc 2.27
these are now stored on the heap (and thus use the dlsym alloc pool).
Messages look like "undefined symbol: __isoc99_printf\0/path/to/a.out".
With many missing library functions and long object paths, the pool is
quickly exhausted. Implement a simple mechanism to return freed memory
to the pool (clear it in case it is used for calloc).
Fixes https://github.com/google/sanitizers/issues/957
Reviewed By: vitalybuka
Differential Revision: https://reviews.llvm.org/D47995
llvm-svn: 334703
In most of systems, this field is a signed type but in some it is an unsigned.
Reviewers: vitalybuka
Reviewed By: vitalybuka
Differential Revision: https://reviews.llvm.org/D48118
llvm-svn: 334686
On 32-bit macOS, "_fputs$UNIX2003" is called instead of "fputs" and the
"fgets_fputs" test fails. Apparently previous versions still passed the
test due to the internal implementation calling "strlen", but that does
not seem to be the case with macOS 10.13.3. Fixes r334450.
llvm-svn: 334670
Summary:
These four SpinMutex ctors was the only code executed in the ctor for
the static __asan::Allocator instance (same for the other sanitizers
allocators), which is supposed to be fully linker-initialized.
Also, when the global ctor for this allocator instance is executed,
this instance might already be initialized by __asan_init called from
.preinit_array.
Issue: https://github.com/google/sanitizers/issues/194
Reviewers: morehouse, eugenis, cryptoad
Subscribers: kubamracek, delcypher, #sanitizers, llvm-commits
Differential Revision: https://reviews.llvm.org/D48142
llvm-svn: 334660
Summary:
Move madvise(MADV_NOHUGEPAGE) for the meta shadow memory after the meta
shadow memory is mapped (currently it silently fails with ENOMEM).
Add a diagnostic message to detect similar problems in the future.
Reviewers: dvyukov
Subscribers: kubamracek, delcypher, #sanitizers, llvm-commits
Differential Revision: https://reviews.llvm.org/D48097
llvm-svn: 334624
When XRay is being built as part of the just built compiler together
with libc++ as part of the runtimes build, we need an explicit
dependency from XRay to libc++ to make sure that the library is
available by the time we start building XRay.
Differential Revision: https://reviews.llvm.org/D48113
llvm-svn: 334575
Provide a buffer that the test harness can write into to provide
values for the environment variables. Format is a null-separated list
of VAR=value pairs; this is sufficent for our purpose.
Differential Revision: https://reviews.llvm.org/D47960
llvm-svn: 334522
Handling differently the iterations with the type limit and eventually an error message.
Reviewers: morehouse, kcc
Reviewed By: morehouse
Differential Revision: https://reviews.llvm.org/D47880
llvm-svn: 334510
Summary:
This CL adds support for aligned new/delete operators (C++17). Currently we
do not support alignment inconsistency detection on deallocation, as this
requires a header change, but the APIs are introduced and are functional.
Add a smoke test for the aligned version of the operators.
Reviewers: alekseyshl
Reviewed By: alekseyshl
Subscribers: delcypher, #sanitizers, llvm-commits
Differential Revision: https://reviews.llvm.org/D48031
llvm-svn: 334505
Summary:
This is part of the larger XRay Profiling Mode effort.
This patch implements the profile writing mechanism, to allow profiles
collected through the profiler mode to be persisted to files.
Follow-on patches would allow us to load these profiles and start
converting/analysing them through the `llvm-xray` tool.
Depends on D44620.
Reviewers: echristo, kpw, pelikan
Reviewed By: kpw
Subscribers: llvm-commits
Differential Revision: https://reviews.llvm.org/D45998
llvm-svn: 334472
Summary:
This is part of the larger XRay Profiling Mode effort.
This patch implements the wiring required to enable us to actually
select the `xray-profiling` mode, and install the handlers to start
measuring the time and frequency of the function calls in call stacks.
The current way to get the profile information is by working with the
XRay API to `__xray_process_buffers(...)`.
In subsequent changes we'll implement profile saving to files, similar
to how the FDR and basic modes operate, as well as means for converting
this format into those that can be loaded/visualised as flame graphs. We
will also be extending the accounting tool in LLVM to support
stack-based function call accounting.
We also continue with the implementation to support building small
histograms of latencies for the `FunctionCallTrie::Node` type, to allow
us to actually approximate the distribution of latencies per function.
Depends on D45758 and D46998.
Reviewers: eizan, kpw, pelikan
Reviewed By: kpw
Subscribers: llvm-commits, mgorny
Differential Revision: https://reviews.llvm.org/D44620
llvm-svn: 334469
Summary:
With Android/Bionic, delay deallocation to round 2 of 4. It must run after
C++ thread_local destructors have been called, but before the final 2
rounds, because emutls calls free, and jemalloc then needs another 2
rounds to free its thread-specific data.
Fixes https://github.com/android-ndk/ndk/issues/687
Reviewers: cmtice, srhines, jyknight, chh, echristo
Reviewed By: srhines, chh, echristo
Subscribers: echristo, delcypher, llvm-commits, #sanitizers
Differential Revision: https://reviews.llvm.org/D46978
llvm-svn: 334463
Summary:
Add fgets, fputs and puts to sanitizer_common. This adds ASAN coverage
for these functions, extends MSAN support from fgets to fputs/puts and
extends TSAN support from puts to fputs.
Fixes: https://github.com/google/sanitizers/issues/952
Reviewed By: vitalybuka
Differential Revision: https://reviews.llvm.org/D46545
llvm-svn: 334450
Summary:
Now all sanitizers with improved allocator error reporting are covered
by these common tests.
Also, add pvalloc-specific checks to LSan.
HWASan is not covered by sanitizer_common, hence its own pvalloc
and other allocator tests.
Reviewers: vitalybuka
Subscribers: srhines, kubamracek, delcypher, #sanitizers, llvm-commits
Differential Revision: https://reviews.llvm.org/D47970
llvm-svn: 334424
Summary:
The shared TSD model in its current form doesn't scale. Here is an example of
rpc2-benchmark (with default parameters, which is threading heavy) on a 72-core
machines (defaulting to a `CompactSizeClassMap` and no Quarantine):
- with tcmalloc: 337K reqs/sec, peak RSS of 338MB;
- with scudo (exclusive): 321K reqs/sec, peak RSS of 637MB;
- with scudo (shared): 241K reqs/sec, peak RSS of 324MB.
This isn't great, since the exclusive model uses a lot of memory, while the
shared model doesn't even come close to be competitive.
This is mostly due to the fact that we are consistently scanning the TSD pool
starting at index 0 for an available TSD, which can result in a lot of failed
lock attempts, and touching some memory that needs not be touched.
This CL attempts to make things better in most situations:
- first, use a thread local variable on Linux (intead of pthread APIs) to store
the current TSD in the shared model;
- move the locking boolean out of the TSD: this allows the compiler to use a
register and potentially optimize out a branch instead of reading it from the
TSD everytime (we also save a tiny bit of memory per TSD);
- 64-bit atomic operations on 32-bit ARM platforms happen to be expensive: so
store the `Precedence` in a `uptr` instead of a `u64`. We lose some
nanoseconds of precision and we'll wrap around at some point, but the benefit
is worth it;
- change a `CHECK` to a `DCHECK`: this should never happen, but if something is
ever terribly wrong, we'll crash on a near null AV if the TSD happens to be
null;
- based on an idea by dvyukov@, we are implementing a bound random scan for
an available TSD. This requires computing the coprimes for the number of TSDs,
and attempting to lock up to 4 TSDs in an random order before falling back to
the current one. This is obviously slightly more expansive when we have just
2 TSDs (barely noticeable) but is otherwise beneficial. The `Precedence` still
basically corresponds to the moment of the first contention on a TSD. To seed
on random choice, we use the precedence of the current TSD since it is very
likely to be non-zero (since we are in the slow path after a failed `tryLock`)
With those modifications, the benchmark yields to:
- with scudo (shared): 330K reqs/sec, peak RSS of 327MB.
So the shared model for this specific situation not only becomes competitive but
outperforms the exclusive model. I experimented with some values greater than 4
for the number of TSDs to attempt to lock and it yielded a decrease in QPS. Just
sticking with the current TSD is also a tad slower. Numbers on platforms with
less cores (eg: Android) remain similar.
Reviewers: alekseyshl, dvyukov, javed.absar
Reviewed By: alekseyshl, dvyukov
Subscribers: srhines, kristof.beyls, delcypher, llvm-commits, #sanitizers
Differential Revision: https://reviews.llvm.org/D47289
llvm-svn: 334410
Summary:
Running sanitized 32-bit x86 programs on glibc 2.27 crashes at startup, with:
ERROR: AddressSanitizer: SEGV on unknown address 0xf7a8a250 (pc 0xf7f807f4 bp 0xff969fc8 sp 0xff969f7c T16777215)
The signal is caused by a WRITE memory access.
#0 0xf7f807f3 in _dl_get_tls_static_info (/lib/ld-linux.so.2+0x127f3)
#1 0xf7a92599 (/lib/libasan.so.5+0x112599)
#2 0xf7a80737 (/lib/libasan.so.5+0x100737)
#3 0xf7f7e14f in _dl_init (/lib/ld-linux.so.2+0x1014f)
#4 0xf7f6eb49 (/lib/ld-linux.so.2+0xb49)
The problem is that glibc changed the calling convention for the GLIBC_PRIVATE
symbol that sanitizer uses (even when it should not, GLIBC_PRIVATE is exactly
for symbols that can change at any time, be removed etc.), see
https://sourceware.org/ml/libc-alpha/2017-08/msg00497.html
Fixes https://github.com/google/sanitizers/issues/954
Patch By: Jakub Jelinek
Reviewed By: vitalybuka, Lekensteyn
Differential Revison: https://reviews.llvm.org/D44623
llvm-svn: 334363
Summary:
Following up on and complementing D44404.
Currently many allocator specific errors (OOM, for example) are reported as
a text message and CHECK(0) termination, not stack, no details, not too
helpful nor informative. To improve the situation, detailed and
structured errors were defined and reported under the appropriate conditions.
Reviewers: eugenis
Subscribers: srhines, delcypher, #sanitizers, llvm-commits
Differential Revision: https://reviews.llvm.org/D47793
llvm-svn: 334338
Summary:
Move the corresponding tests to the common folder (as all of the
sanitizer allocators will support this feature soon) and add the checks
specific to aligned_alloc to ASan and LSan allocators.
Reviewers: vitalybuka
Subscribers: srhines, kubamracek, delcypher, #sanitizers, llvm-commits
Differential Revision: https://reviews.llvm.org/D47924
llvm-svn: 334316
This change uses 'const' for the retryingWriteAll(...) API and removes
unnecessary 'static' local variables in getting the temporary filename.
llvm-svn: 334267
Summary:
This fixes http://llvm.org/PR32274.
This change adds a test to ensure that we're able to link XRay modes and
the runtime to binaries that don't need to depend on the C++ standard
library or a C++ ABI library. In particular, we ensure that this will work
with C programs compiled+linked with XRay.
To make the test pass, we need to change a few things in the XRay
runtime implementations to remove the reliance on C++ ABI features. In
particular, we change the thread-safe function-local-static
initialisation to use pthread_* instead of the C++ features that ensure
non-trivial thread-local/function-local-static initialisation.
Depends on D47696.
Reviewers: dblaikie, jfb, kpw, eizan
Reviewed By: kpw
Subscribers: echristo, eizan, kpw, mgorny, llvm-commits
Differential Revision: https://reviews.llvm.org/D46998
llvm-svn: 334262
Summary:
Currently many allocator specific errors (OOM, for example) are reported as
a text message and CHECK(0) termination, not stack, no details, not too
helpful nor informative. To improve the situation, detailed and
structured errors were defined and reported under the appropriate conditions.
Reviewers: eugenis
Subscribers: kubamracek, delcypher, llvm-commits, #sanitizers
Differential Revision: https://reviews.llvm.org/D47798
llvm-svn: 334248
Summary: Otherwise we print things like [0/1] which is visually confusing.
Reviewers: kcc
Reviewed By: kcc
Subscribers: delcypher, llvm-commits, #sanitizers
Differential Revision: https://reviews.llvm.org/D47837
llvm-svn: 334234
Summary:
signal(3) on NetBSD calls internally sigaction(2).
Without disabling the recursive interceptor, there are
false positives about uninitialized memory reads inside libc.
This change fixes execution of such programs as sh(1) and
vmstat(1) in the NetBSD userland.
Sponsored by <The NetBSD Foundation>
Reviewers: eugenis, vitalybuka, joerg
Reviewed By: vitalybuka
Subscribers: llvm-commits, #sanitizers
Tags: #sanitizers
Differential Revision: https://reviews.llvm.org/D47650
llvm-svn: 334168
On Fuchsia, we use libc++ compiled with ASan for our ASan built
executable which means we cannot use the same libc++ for libFuzzer when
building fuzz targets, instead we'll link a custom internal libc++ into
Fuchsia's build of libFuzzer like we already do on Linux.
Differential Revision: https://reviews.llvm.org/D47835
llvm-svn: 334144
Summary:
Added unit-test.
Fixed behavior of max_len argument.
Call read syscall with all available buffer, not just a page.
Reviewers: eugenis
Subscribers: kubamracek, mgorny, llvm-commits
Differential Revision: https://reviews.llvm.org/D46618
llvm-svn: 334130
By adding a ctor to create fuzzer_allocator<T> from fuzzer_allocator<U>.
This mimics construcotrs of std::allocator<T>.
Without the constructors, some versions of libstdc++ can't compile
`vector<bool, fuzzer_allocator<bool>>`.
llvm-svn: 334077
Summary:
This change extracts the recursion guard implementation from FDR Mode
and updates it to do the following:
- Do the atomic operation correctly to be signal-handler safe.
- Make it usable in both FDR and Basic Modes.
Before this change, the recursion guard relied on an unsynchronised read
and write on a volatile thread-local. A signal handler could then run in
between the read and the write, and then be able to run instrumented
code as part of the signal handling. Using an atomic exchange instead
fixes that by doing a proper mutual exclusion even in the presence of
signal handling.
Reviewers: kpw, eizan, jfb
Reviewed By: eizan
Subscribers: llvm-commits
Differential Revision: https://reviews.llvm.org/D47696
llvm-svn: 334064
Summary:
Following up on and complementing D44404.
Currently many allocator specific errors (OOM, for example) are reported as
a text message and CHECK(0) termination, not stack, no details, not too
helpful nor informative. To improve the situation, detailed and
structured errors were defined and reported under the appropriate conditions.
Reviewers: eugenis
Subscribers: srhines, mgorny, delcypher, llvm-commits, #sanitizers
Differential Revision: https://reviews.llvm.org/D47645
llvm-svn: 334034
We don't actually need to support multiple definitions of the functions
in FDR mode, but rather want to make sure that the implementation-detail
functions are marked as 'static' instead. This allows the inliner to do
its magic better for these functions too, since inline functions must
have a unique address across translation units.
llvm-svn: 334001
We planned to have FDR mode's internals unit-tested but it turns out
that we can just use end-to-end testing to verify the implementation.
We're going to move towards that approach more and more going forward,
so we're merging the implementation details of FDR mode into a single
.cc file.
We also avoid globbing in the XRay test helper macro, and instead list
down the files from the lib directory.
llvm-svn: 333986
Summary:
At least the ASan, MSan, TSan sanitizers require disabled ASLR on a NetBSD.
Introduce a generic CheckASLR() routine, that implements a check for the
current process. This flag depends on the global or per-process settings.
There is no simple way to disable ASLR in the build process from the
level of a sanitizer or during the runtime execution.
With ASLR enabled sanitizers that operate over the process virtual address
space can misbehave usually breaking with cryptic messages.
This check is dummy for !NetBSD.
Sponsored by <The NetBSD Foundation>
Reviewers: vitalybuka, joerg
Reviewed By: vitalybuka
Subscribers: cryptoad, kubamracek, llvm-commits, #sanitizers
Tags: #sanitizers
Differential Revision: https://reviews.llvm.org/D47442
llvm-svn: 333985
Summary:
This is part of the work to address http://llvm.org/PR32274.
We remove the calls to array-placement-new and array-delete. This allows
us to rely on the internal memory management provided by
sanitizer_common/sanitizer_internal_allocator.h.
Reviewers: eizan, kpw
Subscribers: llvm-commits
Differential Revision: https://reviews.llvm.org/D47695
llvm-svn: 333982
XRay doesn't use RTTI and doesn't need it. We disable it explicitly in
the CMake config, similar to how the other sanitizers already do it.
Part of the work to address http://llvm.org/PR32274.
llvm-svn: 333867
Summary:
This allows to build and link the code with e.g.
-fsanitize=dataflow -fsanitize-coverage=trace-pc-guard,pc-table,func,trace-cmp
w/o providing (all) the definitions of trace-cmp hooks.
This is similar to dummy hooks provided by asan/ubsan/msan for the same purpose,
except that some of the hooks need to have the __dfsw_ prefix
since we need dfsan to replace them.
Reviewers: pcc
Reviewed By: pcc
Subscribers: delcypher, #sanitizers, llvm-commits
Differential Revision: https://reviews.llvm.org/D47605
llvm-svn: 333796
Myriad only uses the platform interceptors for memory allocation
routines. Configure them properly.
Also add a missing guard around aligned alloc interceptor.
Differential Revision: https://reviews.llvm.org/D47641
llvm-svn: 333784
Summary:
This is part of the larger XRay Profiling Mode effort.
This patch implements a centralised collector for `FunctionCallTrie`
instances, associated per thread. It maintains a global set of trie
instances which can be retrieved through the XRay API for processing
in-memory buffers (when registered). Future changes will include the
wiring to implement the actual profiling mode implementation.
This central service provides the following functionality:
* Posting a `FunctionCallTrie` associated with a thread, to the central
list of tries.
* Serializing all the posted `FunctionCallTrie` instances into
in-memory buffers.
* Resetting the global state of the serialized buffers and tries.
Depends on D45757.
Reviewers: echristo, pelikan, kpw
Reviewed By: kpw
Subscribers: llvm-commits, mgorny
Differential Revision: https://reviews.llvm.org/D45758
llvm-svn: 333624
We don't use the result of the query, and all tests pass if I remove it.
During startup, ASan spends a fair amount of time in this handler, and
the query is much more expensive than the call to commit the memory.
llvm-svn: 333595
On Myriad RTEMS, we don't need to treat the main thread differently.
The existing thread hooks will do the right thing, so get rid of all
the unneeded special logic.
Differential Revision: https://reviews.llvm.org/D47502
llvm-svn: 333504
Reset shadow memory during exit. Also update a cut-and-paste comment,
and do some minor refactoring of InitializeShadowMemory.
Differential Revision: https://reviews.llvm.org/D47501
llvm-svn: 333503
Fuchsia's _zx_port_wait no longer takes the count argument. This
change also updates all symbol uses to use the underscored versions.
Differential Revision: https://reviews.llvm.org/D47403
llvm-svn: 333328
LIT tests are used to test other cross-compiled architectures,
unit tests are only run on the host.
NFC now as currently only a single architecture is supported.
Differential Revision: https://reviews.llvm.org/D47286
llvm-svn: 333241
Summary:
rL325492 disables FPU features when using soft floating point
(-mfloat-abi=soft), which is used internally when building for armv7. This
causes errors with builtins that utililize VFP instructions. With this change
we first check if VFP is enabled (by checking if the preprocessor macro
__VFP_FP__ is defined) before including such builtins.
Reviewers: rengolin, samsonov, compnerd, smeenai, javed.absar, peter.smith
Reviewed By: peter.smith
Subscribers: peter.smith, mgorny, kristof.beyls, chrib, llvm-commits
Differential Revision: https://reviews.llvm.org/D47217
llvm-svn: 333216
<sys/ustat.h> has been removed from glibc 2.28 by:
commit cf2478d53ad7071e84c724a986b56fe17f4f4ca7
Author: Adhemerval Zanella <adhemerval.zanella@linaro.org>
Date: Sun Mar 18 11:28:59 2018 +0800
Deprecate ustat syscall interface
This patch uses pre-computed size of struct ustat for Linux to fix
https://bugs.llvm.org/show_bug.cgi?id=37418
Patch by H.J. Lu.
Differential Revision: https://reviews.llvm.org/D47281
llvm-svn: 333213
Summary:
The most common usecase for -runs=0 is for generating code coverage
over some corpus. Coverage reports based on sancov are about to be deprecated,
which means some external coverage solution will be used, e.g. Clang source
based code coverage, which does not use any sancov instrumentations and thus
libFuzzer would consider any input to be not interesting in that case.
Reviewers: kcc
Reviewed By: kcc
Subscribers: alex, delcypher, #sanitizers, llvm-commits
Differential Revision: https://reviews.llvm.org/D47271
llvm-svn: 333116
Summary:
`sanitizer_internal_defs.h` didn't have this define, which will be useful in
an upcoming CL.
Reviewers: alekseyshl
Reviewed By: alekseyshl
Subscribers: kubamracek, delcypher, llvm-commits, #sanitizers
Differential Revision: https://reviews.llvm.org/D47270
llvm-svn: 333109
Summary:
We need one library to support all of 39, 42 and 48 bit VMAs, and
there is no common address that works for all of them.
Reviewers: kcc, alekseyshl, javed.absar
Subscribers: rengolin, srhines, kubamracek, kristof.beyls, llvm-commits, cryptoad
Differential Revision: https://reviews.llvm.org/D47160
llvm-svn: 333025
On RTEMS, system and user code all live in a single binary and address
space. There is no clean separation, and instrumented code may
execute before the ASan run-time is initialized (or after it has been
destroyed).
Currently, GetCurrentThread() may crash if it's called before ASan
run-time is initialized. Make it return nullptr instead.
Similarly, fix __asan_handle_no_return so that it gives up rather than
try something that may crash.
Differential Revision: https://reviews.llvm.org/D46459
llvm-svn: 332888
Summary:
The static TLS vector for the main thread on NetBSD/i386 can be
unaligned in terms of the shadow granularity. Align the start of it with
Round Down and end of it with Round Up operations for the shadow
granularity shift.
Example static TLS vector ranges on NetBSD/i386:
tls_begin_=0xfbee7244 tls_end_=0xfbee726c.
ClearShadowForThreadStackAndTLS() is called from the Main Thread
bootstrap functions.
This change restores the NetBSD x86 32-bit (i386) support.
Sponsored by <The NetBSD Foundation>
Reviewers: vitalybuka, joerg
Reviewed By: vitalybuka
Subscribers: kubamracek, llvm-commits, #sanitizers
Tags: #sanitizers
Differential Revision: https://reviews.llvm.org/D46585
llvm-svn: 332792
Summary:
The changes allows building this file on NetBSD, mostly by
disabling the unsupported functions and adding OS-specific
system includes.
Sponsored by <The NetBSD Foundation>
Reviewers: joerg, kcc, vitalybuka
Reviewed By: vitalybuka
Subscribers: llvm-commits, #sanitizers
Tags: #sanitizers
Differential Revision: https://reviews.llvm.org/D46712
llvm-svn: 332791
Summary:
Floating point division by zero or even undef does not have undefined
behavior and may occur due to optimizations.
Fixes https://bugs.llvm.org/show_bug.cgi?id=37523.
Reviewers: kcc
Subscribers: hiraditya, llvm-commits
Differential Revision: https://reviews.llvm.org/D47085
llvm-svn: 332761
This is not needed after we've forked the Myriad version. Not to
mention it produces a compiler warning.
Differential Revision: https://reviews.llvm.org/D47054
llvm-svn: 332744
The Myriad RTEMS memory system has a few unique aspects that
require support in the ASan run-time.
- A limited amount of memory (currently 512M).
- No virtual memory, no memory protection.
- DRAM starts at address 0x80000000. Other parts of memory may be
used for MMIO, etc.
- The second highest address bit is the "cache" bit, and 0x80000000
and 0x84000000 alias to the same memory.
To support the above, we make the following changes:
- Use a ShadowScale of 5, to reduce shadow memory overhead.
- Adjust some existing macros to remove assumption that the lowest
memory address is 0.
- add a RawAddr macro that on Myriad strips the cache bit from the
input address, before using the address for shadow memory (for other
archs this does nothing).
- We must check that an address is in DRAM range before using it to
index into shadow memory.
Differential Revision: https://reviews.llvm.org/D46456
llvm-svn: 332690
This commit contains the trivial portion of the port of ASan to
Myriad RTEMS.
- Whitelist platform in sanitizer_platform.h, ubsan_platform.h
- Turn off general interception
- Use memset for FastPoisonShadow
- Define interception wrappers
- Set errno symbol correctly
- Enable ASAN_LOW_MEMORY
- Enable preinit array
- Disable slow unwinding
- Use fuchsia offline symbolizer
- Disable common code for: InitializeShadowMemory, CreateMainThread,
AsanThread::ThreadStart, StartReportDeadlySignal,
MaybeReportNonExecRegion.
Differential Revision: https://reviews.llvm.org/D46454
llvm-svn: 332681
This gives us something to insert into the shadow gap for systems that
don't have memory protection turned on there (i.e. on Myriad).
Differential Revision: https://reviews.llvm.org/D46457
llvm-svn: 332557
Summary:
It turns out that the previous code construct was not optimizing the allocation
and deallocation of batches. The class id was read as a class member (even
though a precomputed one) and nothing else was optimized. By changing the
construct this way, the compiler actually optimizes most of the allocation and
deallocation away to only work with a single class id, which not only saves some
CPU but also some code footprint.
Reviewers: alekseyshl, dvyukov
Reviewed By: dvyukov
Subscribers: dvyukov, delcypher, llvm-commits, #sanitizers
Differential Revision: https://reviews.llvm.org/D46961
llvm-svn: 332502
Summary:
For the 32-bit TransferBatch:
- `SetFromArray` callers have bounds `count`, so relax the `CHECK` to `DCHECK`;
- same for `Add`;
- mark `CopyToArray` as `const`;
For the 32-bit Primary:
- `{Dea,A}llocateBatch` are only called from places that check `class_id`,
relax the `CHECK` to `DCHECK`;
- same for `AllocateRegion`;
- remove `GetRegionBeginBySizeClass` that is not used;
- use a local variable for the random shuffle state, so that the compiler can
use a register instead of reading and writing to the `SizeClassInfo` at every
iteration;
For the 32-bit local cache:
- pass the count to drain instead of doing a `Min` everytime which is at times
superfluous.
Reviewers: alekseyshl
Reviewed By: alekseyshl
Subscribers: kubamracek, delcypher, #sanitizers, llvm-commits
Differential Revision: https://reviews.llvm.org/D46657
llvm-svn: 332478
Summary:
For some reasons on Chromium when we start leak checking we get own pid as 1.
After that we see threads with PPID:0 assuming that thread is dead in infinite
loop.
To resolve particularly this case and possible issues like this, when IsAlive check failed to detect thread status, we need to limit the number of SuspendAllThreads
iterations.
Reviewers: eugenis
Subscribers: kubamracek, llvm-commits
Differential Revision: https://reviews.llvm.org/D46852
llvm-svn: 332319
Summary:
This is part of the larger XRay Profiling Mode effort.
This patch implements a central data structure for capturing statistics
about XRay instrumented function call stacks. The `FunctionCallTrie`
type does the following things:
* It keeps track of a shadow function call stack of XRay instrumented
functions as they are entered (function enter event) and as they are
exited (function exit event).
* When a function is entered, the shadow stack contains information
about the entry TSC, and updates the trie (or prefix tree)
representing the current function call stack. If we haven't
encountered this function call before, this creates a unique node for
the function in this position on the stack. We update the list of
callees of the parent function as well to reflect this newly found
path.
* When a function is exited, we compute statistics (TSC deltas,
function call count frequency) for the associated function(s) up the
stack as we unwind to find the matching entry event.
This builds upon the XRay `Allocator` and `Array` types in Part 1 of
this series of patches.
Depends on D45756.
Reviewers: echristo, pelikan, kpw
Reviewed By: kpw
Subscribers: llvm-commits, mgorny
Differential Revision: https://reviews.llvm.org/D45757
llvm-svn: 332313
Summary:
This change allows for handling the in-memory data associated with the
FDR mode implementation through the new `__xray_log_process_buffers`
API. With this change, we can now allow users to process the data
in-memory of the process instead of through writing files.
This for example allows users to stream the data of the FDR logging
implementation through network sockets, or through other mechanisms
instead of saving them to local files.
We introduce an FDR-specific flag, for "no_file_flush" which lets the
flushing logic skip opening/writing to files.
This option can be defaulted to `true` when building the compiler-rt
XRay runtime through the `XRAY_FDR_OPTIONS` preprocessor macro.
Reviewers: kpw, echristo, pelikan, eizan
Subscribers: llvm-commits
Differential Revision: https://reviews.llvm.org/D46574
llvm-svn: 332208
Like Fuchsia, Myriad RTEMS uses an off-line symbolizer -- we just need
a custom backtrace frame string. Move this definition to
sanitizer_fuchsia.h; the corresponding RTEMS one will be added when we
add sanitizer_rtems.h.
Differential Revision: https://reviews.llvm.org/D46462
llvm-svn: 332157
In Windows version 1803, the first instruction of ntdll!strchr is:
8a01 mov al,byte ptr [rcx]
This is the only needed change for this version as far as I can tell.
Differential Revision: https://reviews.llvm.org/D46458
llvm-svn: 332095
This appears to be a copy/paste artifact from `AddrIsInHighMem`. It was caught by Firefox's jit-tests on Win64.
Differential Revision: https://reviews.llvm.org/D46291
llvm-svn: 332092
Summary:
This feature is required for proper libFuzzer support.
Adding SI_NETBSD to the list of OSes, fixes breakage in several
libFuzzer tests. It has been debugged with aid from kcc@.
Sponsored by <The NetBSD Foundation>
Reviewers: joerg, vitalybuka, kcc
Reviewed By: vitalybuka
Subscribers: kubamracek, llvm-commits, #sanitizers
Tags: #sanitizers
Differential Revision: https://reviews.llvm.org/D46729
llvm-svn: 332051
Replace decltype(memcpy) with decltype(__asan_memcpy) because memcpy
has not been defined in any headers on RTEMS. Similarly for memmove
and memset.
Differential Revision: https://reviews.llvm.org/D46625
llvm-svn: 332047
If detect-stack-use-after-return is on, initialize fake stack during
AsanThread::Init(), rather than lazily. This is required on Myriad.
From kcc: "There used to be a reason why this was done lazily, but I
don't remember if we still have that reason." Tested on x86.
Differential Revision: https://reviews.llvm.org/D46626
llvm-svn: 332033
Summary:
Experimental data flow tracer for fuzz targets.
Allows to tell which bytes of the input affect which functions of the fuzz target.
We previously attempted to use DFSan directly in the libFuzzer process,
and that didn't work nicely.
Now we will try to collect the data flow information for the seed corpus
in a separate process (using this tracer), and then use it in the regular libFuzzer runs.
Reviewers: morehouse, pcc, Dor1s
Reviewed By: morehouse, Dor1s
Subscribers: delcypher, #sanitizers, llvm-commits
Differential Revision: https://reviews.llvm.org/D46666
llvm-svn: 332029
Summary:
Fixed two non-standard usages of sem_open in the libFuzzer library and
one NetBSD-related modification with test script.
- The return value to indicate error should be SEM_FAILED instead of
(void *)-1 (please refer to "RETURN VALUE" section in this [[
http://pubs.opengroup.org/onlinepubs/9699919799/functions/sem_open.html
| page ]]). Actually, SEM_FAILED != (void *)-1 holds in NetBSD.
- The SharedMemoryRegion::SemName function should return name
starting with slash. Because the behaviour of name which does not
start with slash is unspecified as the [[
http://pubs.opengroup.org/onlinepubs/9699919799/functions/sem_open.html
| "DESCRIPTION" section ]] specified:
> If name does not begin with the <slash> character, the effect is implementation-defined.
- The length of name is limited to 14 in NetBSD, it is suggested to
reduce the length of equivalence server name in the test script.
Patch by: Yang Zheng
Reviewers: vitalybuka, krytarowski, kcc
Reviewed By: kcc
Subscribers: kcc, #sanitizers, llvm-commits, joerg
Differential Revision: https://reviews.llvm.org/D46622
llvm-svn: 332003
Summary:
Enumerating /proc/<pid>/task/ dir Linux may stop if thread is dead. In this case
we miss some alive threads and can report false memory leaks.
To solve this issue we repeat enumeration if the last thread is dead.
Do detect dead threads same way as proc_task_readdir we use
/proc/<pid>/task/<tid>/status.
Similarly it also ends enumeration of if proc_fill_cache fails, but in this case
Linux sets inode to 1 (Bad block).
And just in case re-list threads if we had to call internal_getdents more than
twice or result takes more than half of the buffer.
Reviewers: eugenis, dvyukov, glider
Subscribers: llvm-commits, kubamracek
Differential Revision: https://reviews.llvm.org/D46517
llvm-svn: 331953
Summary:
Leak checker needs to suspend all process threads. If we have some running
thread in registry but not suspended we can have false leak report. So we will
report this case here for future debugging.
Reviewers: eugenis
Subscribers: kubamracek, llvm-commits
Differential Revision: https://reviews.llvm.org/D46663
llvm-svn: 331936
Fuchsia is no longer treated as UNIX which means we need to explicitly
enable building of shared versions of runtimes.
Differential Revision: https://reviews.llvm.org/D46609
llvm-svn: 331922
Summary:
I think there might be something to optimize in `atomic_store`.
Currently, if everything goes well (and we have a different new value), we
always iterate 3 times.
For example, `with a = 0`, `oldval = a`, `newval = 42`, we get:
```
oldval = 0, newval = 42, curval = 0
oldval = 0, newval = 42, curval = 42
oldval = 42, newval = 42, curval = 42
```
and then it breaks.
Unless I am not seeing something, I don't see a point to the third iteration.
If the current value is the one we want, we should just break.
This means that 2 iterations (with a different newval) should be sufficient to
achieve what we want.
Reviewers: dvyukov, alekseyshl
Reviewed By: dvyukov
Subscribers: kubamracek, delcypher, #sanitizers, llvm-commits
Differential Revision: https://reviews.llvm.org/D46597
llvm-svn: 331890
Summary:
When out-of-memory or timeout occurs, threads can be stopped during
symbolization, thereby causing a deadlock when the OOM/TO handlers
attempt symbolization. We avoid this deadlock by skipping symbolization
if another thread is symbolizing.
Reviewers: kcc
Reviewed By: kcc
Subscribers: llvm-commits
Differential Revision: https://reviews.llvm.org/D46605
llvm-svn: 331825
This change adds some assembler comments to facilitate analysis with
llvm-mca. In particular, we're interested in identifying and later
optimising (reducing) the cost of the key functions in the XRay
implementation using both static analysis (with llvm-mca, etc.) and
dynamic analysis (perf profiling, etc.) of microbenchmarks.
llvm-svn: 331711
Summary:
The `TestOnlyInit` function of `{Flat,TwoLevel}ByteMap` seems to be a misnomer
since the function is used outside of tests as well, namely in
`SizeClassAllocator32::Init`. Rename it to `Init` and update the callers.
Reviewers: alekseyshl, vitalybuka
Reviewed By: vitalybuka
Subscribers: kubamracek, delcypher, #sanitizers, llvm-commits
Differential Revision: https://reviews.llvm.org/D46408
llvm-svn: 331662
We reuse the allocation interceptors as is. RTEMS doesn't support
dlsyms. However, it needs to handle memory allocation requests before
the ASan run-time has been initialized. We use the dlsym alloc pool
for this purpose, and we increase its size to 4k to support this
usage.
Differential Revision: https://reviews.llvm.org/D46465
llvm-svn: 331649
Introduce two definitions to be used by the Myriad RTEMS port of the
ASan run-time: SANITIZER_MYRIAD2 for the platform and SANITIZER_RTEMS
for the OS. We expect to use SANITIZER_MYRIAD2 to guard the portion
of the port corresponding to Myriad's unique memory map, and
SANITIZER_RTEMS for most of the rest.
Differential Revision: https://reviews.llvm.org/D46453
llvm-svn: 331646
Summary:
This addresses http://llvm.org/PR36790.
This change allows the XRay Basic Mode implementation to use the
string-based initialization routine provided through
`__xray_log_init_mode(...)`. In the process, we've also deprecated some
flags defined for the `XRAY_OPTIONS` environment variable.
We then introduce another environment variable that can control the XRay
Basic Mode implementation through `XRAY_BASIC_OPTIONS`.
We also rename files from `xray_inmemory_log` to `xray_basic_logging` to
be more in line with the mode implementation.
Depends on D46174.
Reviewers: echristo, kpw, pelikan, eizan
Reviewed By: kpw
Subscribers: mgorny, llvm-commits
Differential Revision: https://reviews.llvm.org/D46246
llvm-svn: 331507
Summary:
In this chage we add support for the string-based configuration
mechanism for configuring FDR mode.
We deprecate most of the `xray_fdr_log_*` flags that are set with the
`XRAY_OPTIONS` environment variable. Instead we make the FDR
implementation take defaults from the `XRAY_FDR_OPTIONS` environment
variable, and use the flags defined in `xray_fdr_flags.{h,cc,inc}` for
the options we support.
This change addresses http://llvm.org/PR36790.
Depends on D46173.
Reviewers: eizan, pelikan, kpw, echristo
Subscribers: llvm-commits, mgorny
Differential Revision: https://reviews.llvm.org/D46174
llvm-svn: 331506
Summary:
This addresses http://llvm.org/PR36790.
The change Deprecates a number of functions and types in
`include/xray/xray_log_interface.h` to recommend using string-based
configuration of XRay through the __xray_log_init_mode(...) function. In
particular, this deprecates the following:
- `__xray_set_log_impl(...)` -- users should instead use the
`__xray_log_register_mode(...)` and `__xray_log_select_mode(...)` APIs.
- `__xray_log_init(...)` -- users should instead use the
`__xray_log_init_mode(...)` function, which also requires using the
`__xray_log_register_mode(...)` and `__xray_log_select_mode(...)`
functionality.
- `__xray::FDRLoggingOptions` -- in following patches, we'll be
migrating the FDR logging implementations (and tests) to use the
string-based configuration. In later stages we'll remove the
`__xray::FDRLoggingOptions` type, and ask users to migrate to using the
string-based configuration mechanism instead.
- `__xray::BasicLoggingOptions` -- same as `__xray::FDRLoggingOptions`,
we'll be removing this type later and instead rely exclusively on the
string-based configuration API.
We also update the documentation to reflect the new advice and remove
some of the deprecated notes.
Reviewers: eizan, kpw, echristo, pelikan
Reviewed By: kpw
Subscribers: llvm-commits
Differential Revision: https://reviews.llvm.org/D46173
llvm-svn: 331503
If the sanitizer runtime is loaded in a binary that doesn't really
support it, then __sanitizer_startup_hook will never have been
called to initialize StoredArgv. This case can't be supported, but
its failure mode shouldn't be to crash in sanitizer_common internals.
Patch By: mcgrathr
Differential Revision: https://reviews.llvm.org/D46344
llvm-svn: 331382
Short-circuiting causes tests to fail on Mac since libFuzzer crashes
rather than exiting with an error code when an unexpected signal
happens.
llvm-svn: 331324
Summary:
Fixes https://github.com/google/sanitizers/issues/788/, a deadlock
caused by multiple crashes happening at the same time. Before printing
a crash report, we now test and set an atomic flag. If the flag was
already set, the crash handler returns immediately.
Reviewers: kcc
Reviewed By: kcc
Subscribers: llvm-commits, kubamracek
Differential Revision: https://reviews.llvm.org/D46277
llvm-svn: 331310
The problem is reported in:
https://github.com/google/sanitizers/issues/945
We already disable as much as possible after multithreaded fork,
trace switching is last place that can hang due to basic
operations (memory accesses, function calls).
Disable it too.
llvm-svn: 331163
Summary:
This change is part of the larger XRay Profiling Mode effort.
Here we implement an arena allocator, for fixed sized buffers used in a
segmented array implementation. This change adds the segmented array
data structure, which relies on the allocator to provide and maintain
the storage for the segmented array.
Key features of the `Allocator` type:
* It uses cache-aligned blocks, intended to host the actual data. These
blocks are cache-line-size multiples of contiguous bytes.
* The `Allocator` has a maximum memory budget, set at construction
time. This allows us to cap the amount of data each specific
`Allocator` instance is responsible for.
* Upon destruction, the `Allocator` will clean up the storage it's
used, handing it back to the internal allocator used in
sanitizer_common.
Key features of the `Array` type:
* Each segmented array is always backed by an `Allocator`, which is
either user-provided or uses a global allocator.
* When an `Array` grows, it grows by appending a segment that's
fixed-sized. The size of each segment is computed by the number of
elements of type `T` that can fit into cache line multiples.
* An `Array` does not return memory to the `Allocator`, but it can keep
track of the current number of "live" objects it stores.
* When an `Array` is destroyed, it will not return memory to the
`Allocator`. Users should clean up the `Allocator` independently of
the `Array`.
* The `Array` type keeps a freelist of the chunks it's used before, so
that trimming and growing will re-use previously allocated chunks.
These basic data structures are used by the XRay Profiling Mode
implementation to implement efficient and cache-aware storage for data
that's typically read-and-write heavy for tracking latency information.
We're relying on the cache line characteristics of the architecture to
provide us good data isolation and cache friendliness, when we're
performing operations like searching for elements and/or updating data
hosted in these cache lines.
Reviewers: echristo, pelikan, kpw
Subscribers: mgorny, llvm-commits
Differential Revision: https://reviews.llvm.org/D45756
llvm-svn: 331141
1. Allow to suppress by current stack.
We generally allow to suppress by all main stacks.
Current is probably the stack one wants to use to
suppress such reports.
2. Fix last lock stack restoration.
We trimmed shadow value by storing it in u32.
This magically worked for the test that provoked
the report on the main thread. But this breaks
for locks in any other threads.
llvm-svn: 331023
Otherwise LLD will not align the .ASAN$GA section start, and
&__asan_globals + 1 will not be the start of the next real ASan global
metadata in .ASAN$GL.
We discovered this issue when attempting to use LLD on Windows in
Chromium: https://crbug.com/837090
llvm-svn: 330990
Summary:
This adds `__scudo_print_stats` as an interface function to display the Primary
and Secondary allocator statistics for Scudo.
Reviewers: alekseyshl, flowerhack
Reviewed By: alekseyshl
Subscribers: delcypher, llvm-commits, #sanitizers
Differential Revision: https://reviews.llvm.org/D46016
llvm-svn: 330857
The read/write flag is set by manually decoding the instruction that caused
the exception. It is implemented this way because the cause register which
contains the needed flag was removed from the signal context structure which
the user handler receives from the kernel.
Patch by Milos Stojanovic.
Differential Revision: https://reviews.llvm.org/D45768
llvm-svn: 330840
This code is ill-formed, but under -fno-exceptions compilers generally accept it (at least, prior to C++17). This allows this code to be built by Clang in C++17 mode.
llvm-svn: 330765
Summary:
The following functions are only used in tests: `SetEnv`,
`SanitizerSetThreadName`, `SanitizerGetThreadName`. I don't think they are
going to be used in the future, and I propose to get rid of them, and associated
tests and include.
Reviewers: alekseyshl, eugenis, vitalybuka
Reviewed By: vitalybuka
Subscribers: dvyukov, vitalybuka, kubamracek, delcypher, llvm-commits, #sanitizers
Differential Revision: https://reviews.llvm.org/D45838
llvm-svn: 330724
It doesn't make sense to non-deterministically choose between
`CopyPart(..)` and `InsertPart(..)` when it is known that
`InsertPart(..)` will fail.
This upstream's a change from JFS solver's fork of LibFuzzer.
Differential Revision: https://reviews.llvm.org/D45693
llvm-svn: 330687
A small but substantial minority of libFuzzer-based fuzzers run code that
does not play well with fork in global constructors or LLVMFuzzerInitialize.
This patch allows these fuzzers to use afl_driver by allowing them to
opt-out of using AFL's deferred forkserver which deferres calling fork until
after this code.
Patch By: metzman
Differential Revision: https://reviews.llvm.org/D45744
llvm-svn: 330652
Summary:
Example:
Printf("%-5s", "123");
should yield:
'123 '
In case Printf's requested string field width is larger than the string
argument length, the resulting string should be padded up to the requested
width.
For the simplicity sake, implementing left-justified (right padding) only.
Reviewers: eugenis
Subscribers: kubamracek, delcypher, #sanitizers, llvm-commits
Differential Revision: https://reviews.llvm.org/D45906
llvm-svn: 330643
Retire the fixed shadow memory mapping to avoid conflicts with default
process memory mapping (currently manifests on Android).
Tests on AArch64 show <1% performance loss and code size increase,
making it possible to use dynamic shadow memory by default.
Keep the fixed shadow memory mapping around to be able to run
performance comparison tests later.
Re-commiting D45847 with fixed shadow for x86-64.
llvm-svn: 330624
This commit causes internal errors with ld.bfd 2.24. My guess is that
the ifunc usage in this commit is causing problems. This is the default
system linker on Trusty Tahr, which is from 2014. I claim it's still in
our support window. Maybe we will decide to drop support for it, but
let's get the bots green while we do the investigation and have that
discussion.
Discovered here: https://crbug.com/835864
llvm-svn: 330619
The profile library was missing some includes and was erroneously using
ftruncate. WinASan was using `= {0}` to initialize structs, which
creates -Wmissing-field-initializers and -Wmissing-braces warnings with
clang. Use `= {}` instead, since this is C++.
llvm-svn: 330616
Summary:
Fuchsia uses zx_system_get_features in lieu of getauxval.
Use this call when checking for CRC32 support.
Reviewers: cryptoad
Reviewed By: cryptoad
Subscribers: delcypher, llvm-commits, #sanitizers, kristof.beyls, chrib
Differential Revision: https://reviews.llvm.org/D45896
llvm-svn: 330598
Summary:
Retire the fixed shadow memory mapping to avoid conflicts with default
process memory mapping (currently manifests on Android).
Tests on AArch64 show <1% performance loss and code size increase,
making it possible to use dynamic shadow memory by default.
For the simplicity and unifirmity sake, use dynamic shadow memory mapping
with base address accessed via ifunc resolver on all supported platforms.
Keep the fixed shadow memory mapping around to be able to run
performance comparison tests later.
Complementing D45840.
Reviewers: eugenis
Subscribers: srhines, kubamracek, dberris, mgorny, kristof.beyls, delcypher, #sanitizers, llvm-commits
Differential Revision: https://reviews.llvm.org/D45847
llvm-svn: 330474
Summary:
Example:
Printf("%.*s", 5, "123");
should yield:
'123 '
In case Printf's requested string precision is larger than the string
argument, the resulting string should be padded up to the requested
precision.
For the simplicity sake, implementing right padding only.
Reviewers: eugenis
Subscribers: kubamracek, delcypher, #sanitizers, llvm-commits
Differential Revision: https://reviews.llvm.org/D45844
llvm-svn: 330458
This test is failing on my Linux box. Just increasing the number of
iterations works around this. The divergence is likely due to
our reliance on `std::shuffle()` which is not guaranteed to have
the same behaviour across platforms.
This is a strong argument for us to implement our own shuffle
function to avoid divergence in behaviour across platforms.
Differential Revision: https://reviews.llvm.org/D45767
llvm-svn: 330390
Summary:
Some of the functions had spurious conditional statements and checks, and some
intermediary variables that I feel made the code more complicated than it needs
to be. Also, when unmapping the whole range, the range size would be 0, but
the base was set to the address of the end of the range, which sounds prone to
error. I think nulling out the base in this scenario is a better way to go.
Reviewers: alekseyshl, flowerhack
Reviewed By: alekseyshl
Subscribers: kubamracek, delcypher, #sanitizers, llvm-commits
Differential Revision: https://reviews.llvm.org/D45775
llvm-svn: 330355
The initial naive approach to simulate SIGINT on Fuchsia was to getchar
and look for ETX. This caused the InterruptHandler thread to lock stdin,
preventing musl's exit() from being able to close the stdio descriptors
and complete. This change uses select() instead.
Patch By: aarongreen
Differential Revision: https://reviews.llvm.org/D45636
llvm-svn: 330328
Summary:
"N" suffix is added by the instrumentation and interface functions
are expected to be exported from the library as __hwasan_loadN* and
__hwasan_storeN*.
Reviewers: eugenis
Subscribers: kubamracek, delcypher, #sanitizers, llvm-commits
Differential Revision: https://reviews.llvm.org/D45739
llvm-svn: 330297
Summary:
While I was sifting through dead code findings, I stumbled on this function.
First, for `__s390__` it always returned 0 for the 1st call, which doesn't seem
right. 2nd call & beyond would return the correct value though.
Then it duplicated the `atomic_store` multiple times, sometimes with a `if`,
sometimes without. Finally it used a capitalized variable name starting with `k`
which indicates a constant, and it is not.
So:
- rename the static global variable;
- change the atomic functions to their relaxed version;
- move the store to the end, and make sure we return `val` all the time.
Reviewers: alekseyshl, eugenis, koriakin
Reviewed By: alekseyshl
Subscribers: kubamracek, delcypher, llvm-commits, #sanitizers
Differential Revision: https://reviews.llvm.org/D45725
llvm-svn: 330268
Summary:
Typed event patching is implemented for x86-64, but functions must
be defined for other arches.
Reviewers: dberris, pelikan
Subscribers: nemanjai, javed.absar, delcypher, #sanitizers, llvm-commits
Differential Revision: https://reviews.llvm.org/D45749
llvm-svn: 330231
Summary:
Compiler-rt support first before defining the __xray_typedevent() lowering in
llvm. I'm looking for some early feedback before I touch much more code.
Reviewers: dberris
Subscribers: delcypher, llvm-commits, #sanitizers
Differential Revision: https://reviews.llvm.org/D43668
llvm-svn: 330218
Summary:
Going through the dead code findings, the code removed in this CL appears to be
pretty straightforward to remove, and seems to be some leftover from previous
refactors.
Reviewers: alekseyshl, eugenis
Reviewed By: alekseyshl
Subscribers: kubamracek, delcypher, #sanitizers, llvm-commits
Differential Revision: https://reviews.llvm.org/D45704
llvm-svn: 330190
Summary:
It looks like OSX's UBSan needs a "NoHooks" version of
`RTSanitizerCommonSymbolizer` to work build properly.
Subscribers: kubamracek, mgorny, delcypher, llvm-commits, #sanitizers
Differential Revision: https://reviews.llvm.org/D45696
llvm-svn: 330146
Summary:
Host symbolizer & stacktraces related code in their own RT:
`RTSanitizerCommonSymbolizer`, which is "libcdep" by nature. Symbolizer &
stacktraces specific code that used to live in common files is moved to a new
file `sanitizer_symbolizer_report.cc` as is.
The purpose of this is the enforce a separation between code that relies on
symbolization and code that doesn't. This saves the inclusion of spurious code
due to the interface functions with default visibility, and the extra data
associated.
The following sanitizers makefiles were modified & tested locally:
- dfsan: doesn't require the new symbolizer RT
- esan: requires it
- hwasan: requires it
- lsan: requires it
- msan: requires it
- safestack: doesn't require it
- xray: doesn't require it
- tsan: requires it
- ubsan: requires it
- ubsan_minimal: doesn't require it
- scudo: requires it (but not for Fuchsia that has a minimal runtime)
This was tested locally on Linux, Android, Fuchsia.
Reviewers: alekseyshl, eugenis, dberris, kubamracek, vitalybuka, dvyukov, mcgrathr
Reviewed By: alekseyshl, vitalybuka
Subscribers: srhines, kubamracek, mgorny, krytarowski, delcypher, llvm-commits, #sanitizers
Differential Revision: https://reviews.llvm.org/D45457
llvm-svn: 330131
The current implementation of the Go sanitizer only works on x86_64.
Added some modifications to the buildgo.sh script and the Tsan code
to make it work on powerpc64/linux.
Author: cseo (Carlos Eduardo Seo)
Reviewed in: https://reviews.llvm.org/D43025
llvm-svn: 330122
When bulding libFuzzer as part of the toolchain, C++ library may not
have been fully built yet so the C++ compiler checks will fail, but we
don't care since we don't need C++ library anyway as we're building
our own.
Differential Revision: https://reviews.llvm.org/D45638
llvm-svn: 330075
Summary:
In the same spirit of SanitizerToolName, allow the Primary & Secondary
allocators to have names that can be set by the tools via PrimaryAllocatorName
and SecondaryAllocatorName.
Additionally, set a non-default name for Scudo.
Reviewers: alekseyshl, vitalybuka
Reviewed By: alekseyshl, vitalybuka
Subscribers: kubamracek, delcypher, #sanitizers, llvm-commits
Differential Revision: https://reviews.llvm.org/D45600
llvm-svn: 330055
Summary:
- last change (+ the Apple support change) missed a lot of indentation
- shorten architecture SOURCES definitions as most fit 1 line/arch
- comment in English what's where, and where the different .a come from
(using only the word "runtime" in the comment isn't useful, since the
CMake primitive itself says "runtime" in its name)
- skip unsupported architectures quickly, to avoid extra indentation
Reviewers: dberris, eizan, kpw
Subscribers: mgorny, delcypher, #sanitizers, llvm-commits
Differential Revision: https://reviews.llvm.org/D45568
llvm-svn: 329998
Objective-C's @synchronize synchronization primitive uses calls to objc_sync_enter and objc_sync_exit runtime functions. In most cases, they end up just calling pthread_mutex_lock/pthread_mutex_unlock, but there are some cases where the synchronization from pthread_mutex_lock/pthread_mutex_unlock interceptors isn't enough. Let's add explicit interceptors for objc_sync_enter and objc_sync_exit to handle all cases.
Differential Revision: https://reviews.llvm.org/D45487
llvm-svn: 329982
IsStackOverflow only treats accesses within 512 bytes of SP as stack-overflow. This should really be the size of a page instead.
The scariness_score_test.cc triggers stack overflow with frames that are even larger than a page, which can also trigger a fault that will not be recognized as stack-overflow. Let's just use smaller frames.
llvm-svn: 329980
Summary:
Now that common options are propagated again for runtimes build with D45507,
the -f{data,function}-sections flags are now duplicates, remove them.
Reviewers: alekseyshl
Reviewed By: alekseyshl
Subscribers: mgorny, delcypher, #sanitizers, llvm-commits
Differential Revision: https://reviews.llvm.org/D45575
llvm-svn: 329925
Summary:
This was missed during the review of D38595, but the vmo name size computation
should use internal_strlen, not sizeof, otherwise we end up with 7 character
names.
Reviewers: mcgrathr, flowerhack
Reviewed By: mcgrathr
Subscribers: kubamracek, delcypher, #sanitizers, llvm-commits
Differential Revision: https://reviews.llvm.org/D45525
llvm-svn: 329842
Summary:
This patch implements the `-fxray-modes=` flag which allows users
building with XRay instrumentation to decide which modes to pre-package
into the binary being linked. The default is the status quo, which will
link all the available modes.
For this to work we're also breaking apart the mode implementations
(xray-fdr and xray-basic) from the main xray runtime. This gives more
granular control of which modes are pre-packaged, and picked from
clang's invocation.
This fixes llvm.org/PR37066.
Note that in the future, we may change the default for clang to only
contain the profiling implementation under development in D44620, when
that implementation is ready.
Reviewers: echristo, eizan, chandlerc
Reviewed By: echristo
Subscribers: mgorny, mgrang, cfe-commits, llvm-commits
Differential Revision: https://reviews.llvm.org/D45474
llvm-svn: 329772
Summary:
This is a redo of D45296.
It looks like the random stack-protector issues I was getting were coming from
my Android emulator, and updating everything all around and relaunching stuff
ended up making it go away.
I guess I'll have to see how it behaves on the bots.
Only additional change from the previous CL is some `const` were appropriate.
Reviewers: alekseyshl
Reviewed By: alekseyshl
Subscribers: kubamracek, delcypher, #sanitizers, llvm-commits
Differential Revision: https://reviews.llvm.org/D45461
llvm-svn: 329706
Disabling threads makes <atomic> unusable, but this is needed by LLVM
libraries that are dependencies of the symbolizer.
Differential Revision: https://reviews.llvm.org/D45424
llvm-svn: 329672
Summary:
- getentropy presence since late 2014, safe to use.
- guarantees to delivers good random data up to 256 bytes.
- fall back to /dev/urandom as long the buffer is correct.
Patch by David CARLIER
Reviewers: kubamracek, vitalybuka
Reviewed By: vitalybuka
Subscribers: cryptoad, llvm-commits, #sanitizers
Differential Revision: https://reviews.llvm.org/D44866
llvm-svn: 329633
Summary:
- Enabling libfuzzer on OpenBSD
- OpenBSD can t support asan, msan ... the tests can t be run.
Patch by David CARLIER
Reviewers: eugenis, phosek, vitalybuka
Reviewed By: vitalybuka
Subscribers: srhines, mgorny, krytarowski, llvm-commits, #sanitizers
Differential Revision: https://reviews.llvm.org/D44877
llvm-svn: 329631
Summary:
Even this version seems to mess with Android somehow. Reverting for now while
I figure out what's up.
Subscribers: kubamracek, delcypher, #sanitizers, llvm-commits
Differential Revision: https://reviews.llvm.org/D45450
llvm-svn: 329606
Summary:
Still pursuing the ultimate goal of splitting the Symbolizer code from
RTSanitizerCommon core, allow `BackgroundThread` to work even when not linked
with `sanitizer_stackdepot.cc`. There is no reason this function should pull in
the whole `StackDepot` if symbolization is not supported.
Currently this has no functional change as the depot is always linked anyway.
Reviewers: alekseyshl
Reviewed By: alekseyshl
Subscribers: kubamracek, delcypher, llvm-commits, #sanitizers
Differential Revision: https://reviews.llvm.org/D45296
llvm-svn: 329595
Summary:
Minor style changes to complement D44404:
- make use of a new ErrorBase ctor
- de-duplicate a comment about VS2013 support
Reviewers: eugenis
Subscribers: kubamracek, delcypher, llvm-commits, #sanitizers
Differential Revision: https://reviews.llvm.org/D45390
llvm-svn: 329586
opened.
Summary:
Currently if the directory cannot be opened for a reason other than
non-existence (e.g. too many open file descriptors) the error message
printed is incredibly confusing.
Patch By: Alex Gaynor
Reviewers: kcc, morehouse
Reviewed By: morehouse
Subscribers: delcypher, llvm-commits, Sanitizers
Differential Revision: https://reviews.llvm.org/D45322
llvm-svn: 329438
Summary:
The purpose of this set of changes is to separate stackframe/symbolizer support into their own RT within sanitizer_common.
Sanitizers with no use for those could then be built without the extraneous dependencies pulled in by the default visibility interface functions.
I am aiming to do small changes for specific platforms.
In this one, we split the unwind functions from sanitizer_win.cc into their own sanitizer_unwind_win.cc.
Reviewers: alekseyshl, rnk
Reviewed By: alekseyshl, rnk
Subscribers: delcypher, #sanitizers, kubamracek, mgorny, llvm-commits
Differential Revision: https://reviews.llvm.org/D44799
llvm-svn: 329204
Summary:
This is D45125; the patch enables the build of XRay on OpenBSD. We also
introduce some OpenBSD specific changes to the runtime implementation,
involving how we get the TSC rate through the syscall interface specific
to OpenBSD.
Reviewers: dberris
Authored by: devnexen
Subscribers: dberris, mgorny, krytarowski, llvm-commits
Differential Revision: https://reviews.llvm.org/D45125
llvm-svn: 329189
Summary:
`Symbolizer::PrepareForSandboxing` is empty for all platforms and apparently
has been for a while (D10213). Remove it, and shuffle things around so that the
platform specific code is now in `PlatformPrepareForSandboxing`.
This allows to have one less symbolizer dependency in a common file, which
helps for the upcoming split.
Also remove `SymbolizerPrepareForSandboxing` in tsan_go which appears to not
be used anywhere.
Reviewers: alekseyshl, eugenis, dvyukov, mcgrathr
Reviewed By: alekseyshl
Subscribers: kubamracek, delcypher, llvm-commits, #sanitizers
Differential Revision: https://reviews.llvm.org/D44953
llvm-svn: 329094
This patch fixes the following issues:
(1) The strong definition of the merge hook function was not working which
breaks the online value profile merging. This patch removes the weak
attribute of VPMergeHook and assigns the value dynamically.
(2) Truncate the proifle file so that we don't have garbage data at the end of
the file.
(3) Add new __llvm_profile_instrument_target_value() interface to do the value
profile update in batch. This is needed as the original incremental by 1
in __llvm_profile_instrument_target() is too slow for online merge.
Differential Revision: https://reviews.llvm.org/D44847
llvm-svn: 328987
Summary:
Currently many allocator specific errors (OOM, for example) are reported as
a text message and CHECK(0) termination, not stack, no details, not too
helpful nor informative. To improve the situation, ASan detailed errors were
defined and reported under the appropriate conditions.
Issue: https://github.com/google/sanitizers/issues/887
Reviewers: eugenis
Subscribers: kubamracek, delcypher, #sanitizers, llvm-commits
Differential Revision: https://reviews.llvm.org/D44404
llvm-svn: 328722
Summary:
Fuchsia requires its Scudo shared runtime to not be C++ dependant. Since they
don't use UBSan in conjunction with Scudo, we can just remove the runtime,
and add the extra `nostdinc++` and `nostdlib++` flags. No need for Coverage
either. This allows to keep things going while working on additional splits
of sanitizer_commong and a more minimal runtime.
Reviewers: phosek, flowerhack, alekseyshl
Reviewed By: phosek, alekseyshl
Subscribers: mgorny, delcypher, #sanitizers, llvm-commits
Differential Revision: https://reviews.llvm.org/D44791
llvm-svn: 328625
Summary:
Porting HWASan to Linux x86-64, first of the three patches, compiler-rt part.
The approach is similar to ARM case, trap signal is used to communicate
memory tag check failure. int3 instruction is used to generate a signal,
access parameters are stored in nop [eax + offset] instruction immediately
following the int3 one
Had to add HWASan init on malloc because, due to much less interceptors
defined (most other sanitizers intercept much more and get initalized
via one of those interceptors or don't care about malloc), HWASan was not
initialized yet when libstdc++ was trying to allocate memory for its own
fixed-size heap, which led to CHECK-fail in AllocateFromLocalPool.
Also added the CHECK() failure handler with more detailed message and
stack reporting.
Reviewers: eugenis
Subscribers: kubamracek, dberris, mgorny, kristof.beyls, delcypher, #sanitizers, llvm-commits
Differential Revision: https://reviews.llvm.org/D44705
llvm-svn: 328385
The system call now fails when it cannot write the requested size.
Update the sanitizer runtime Fuchsia implementation accordingly.
Differential Revision: https://reviews.llvm.org/D44770
llvm-svn: 328273
Summary:
- Use internal_syscall_ptr in internal_readlink
- use sigcontext on OpenBSD
Patch by David CARLIER
Reviewers: krytarowski, vitalybuka
Reviewed By: vitalybuka
Subscribers: kubamracek, llvm-commits, #sanitizers
Differential Revision: https://reviews.llvm.org/D44713
llvm-svn: 328239
Summary:
`sanitizer_common`'s coverage support is fairly well separated, and libcdep by
default. Several sanitizers don't make use of coverage, and as far as I can
tell do no benefit from the extra dependencies pulled in by the coverage public
interface functions.
The following sanitizers call `InitializeCoverage` explicitely: MSan, ASan,
LSan, HWAsan, UBSan. On top of this, any sanitizer bundling RTUBSan should
add the coverage RT as well: ASan, Scudo, UBSan, CFI (diag), TSan, MSan, HWAsan.
So in the end the following have no need: DFSan, ESan, CFI, SafeStack (nolibc
anyway), XRay, and the upcoming Scudo minimal runtime.
I tested this with all the sanitizers check-* with gcc & clang, and in
standalone on Linux & Android, and there was no issue. I couldn't test this on
Mac, Fuchsia, BSDs, & Windows for lack of an environment, so adding a bunch of
people for additional scrunity. I couldn't test HWAsan either.
Reviewers: eugenis, vitalybuka, alekseyshl, flowerhack, kubamracek, dberris, rnk, krytarowski
Reviewed By: vitalybuka, alekseyshl, flowerhack, dberris
Subscribers: mgorny, delcypher, #sanitizers, llvm-commits
Differential Revision: https://reviews.llvm.org/D44701
llvm-svn: 328204
Summary:
Following-up the refactoring of mmap interceptors, adding a new common
option to detect PROT_WRITE|PROT_EXEC pages request.
Patch by David CARLIER
Reviewers: vitalybuka, vsk
Reviewed By: vitalybuka
Subscribers: krytarowski, #sanitizers
Differential Revision: https://reviews.llvm.org/D44194
llvm-svn: 328151
New API passes a callback function to the external symbolizer,
allowing it to add multiple frames to the traceback. Note that
the old interface API will be still supported until the clients
migrate to the new one.
Author: asmundak (Alexander Smundak)
Reviewed in: https://reviews.llvm.org/D44714
llvm-svn: 328079
Summary:
r327219 added wrappers to std::sort which randomly shuffle the container before sorting.
This will help in uncovering non-determinism caused due to undefined sorting
order of objects having the same key.
To make use of that infrastructure we need to invoke llvm::sort instead of std::sort.
Reviewers: kcc, rsmith, RKSimon, eugenis
Reviewed By: RKSimon
Subscribers: efriedma, kubamracek, dberris, #sanitizers, llvm-commits
Differential Revision: https://reviews.llvm.org/D44360
llvm-svn: 327929
This is needed otherwise we'll get undefined references when trying
to use the libFuzzer built for Fuchsia.
Differential Revision: https://reviews.llvm.org/D44590
llvm-svn: 327759
Summary:
One forgotten file change + reordering one header due to clang-format
Patch by David CARLIER
Reviewers: vitalybuka, vsk
Subscribers: kubamracek, fedor.sergeev, llvm-commits, #sanitizers
Differential Revision: https://reviews.llvm.org/D44556
llvm-svn: 327758
Summary:
vfork is not ASan-friendly because it modifies stack shadow in the
parent process address space. While it is possible to compensate for that with, for example,
__asan_handle_no_return before each call to _exit or execve and friends, simply replacing
vfork with fork looks like by far the easiest solution.
Posix compliant programs can not detect the difference between vfork and fork.
Fixes https://github.com/google/sanitizers/issues/925
Reviewers: kcc, vitalybuka
Subscribers: kubamracek, llvm-commits
Differential Revision: https://reviews.llvm.org/D44587
llvm-svn: 327752
Summary: Following-up the refactoring of mmap interceptors, adding a new common option to detect PROT_WRITE|PROT_EXEC pages request.
Patch by David CARLIER
Reviewers: vitalybuka, vsk
Reviewed By: vitalybuka
Subscribers: krytarowski, #sanitizers
Differential Revision: https://reviews.llvm.org/D44194
llvm-svn: 327747
This commit breaks actual Go runtime build on gomote builders (10.12) with:
xcode-select: error: tool 'xcodebuild' requires Xcode,
but active developer directory '/Library/Developer/CommandLineTools'
is a command line tools instance
Without this part build works fine.
The original commit does not include any explanation as to why
it is needed.
llvm-svn: 327700
Summary: Following-up the refactoring of mmap interceptors, adding a new common option to detect PROT_WRITE|PROT_EXEC pages request.
Patch by David CARLIER
Reviewers: vitalybuka, vsk
Reviewed By: vitalybuka
Subscribers: krytarowski, #sanitizers
Differential Revision: https://reviews.llvm.org/D44194
llvm-svn: 327696
Summary: Ripped off OpenBSD specific from the common Linux implementation
Patch by David Carlier
Reviewers: krytarowski, vitalybuka
Reviewed By: vitalybuka
Subscribers: emaste, srhines, kubamracek, fedor.sergeev, llvm-commits, #sanitizers
Differential Revision: https://reviews.llvm.org/D44036
llvm-svn: 327674
Kostya Serebryany