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llvm-project/compiler-rt/lib/sanitizer_common/sanitizer_posix.cpp

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//===-- sanitizer_posix.cpp -----------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This file is shared between AddressSanitizer and ThreadSanitizer
// run-time libraries and implements POSIX-specific functions from
// sanitizer_posix.h.
//===----------------------------------------------------------------------===//
#include "sanitizer_platform.h"
#if SANITIZER_POSIX
#include "sanitizer_common.h"
#include "sanitizer_file.h"
#include "sanitizer_flags.h"
#include "sanitizer_libc.h"
#include "sanitizer_posix.h"
#include "sanitizer_procmaps.h"
#include <errno.h>
#include <fcntl.h>
#include <signal.h>
#include <sys/mman.h>
#if SANITIZER_FREEBSD
// The MAP_NORESERVE define has been removed in FreeBSD 11.x, and even before
// that, it was never implemented. So just define it to zero.
#undef MAP_NORESERVE
#define MAP_NORESERVE 0
#endif
namespace __sanitizer {
// ------------- sanitizer_common.h
uptr GetMmapGranularity() {
return GetPageSize();
}
void *MmapOrDie(uptr size, const char *mem_type, bool raw_report) {
size = RoundUpTo(size, GetPageSizeCached());
uptr res = MmapNamed(nullptr, size, PROT_READ | PROT_WRITE,
MAP_PRIVATE | MAP_ANON, mem_type);
int reserrno;
if (UNLIKELY(internal_iserror(res, &reserrno)))
ReportMmapFailureAndDie(size, mem_type, "allocate", reserrno, raw_report);
IncreaseTotalMmap(size);
return (void *)res;
}
void UnmapOrDie(void *addr, uptr size) {
if (!addr || !size) return;
uptr res = internal_munmap(addr, size);
if (UNLIKELY(internal_iserror(res))) {
Report("ERROR: %s failed to deallocate 0x%zx (%zd) bytes at address %p\n",
SanitizerToolName, size, size, addr);
CHECK("unable to unmap" && 0);
}
DecreaseTotalMmap(size);
}
void *MmapOrDieOnFatalError(uptr size, const char *mem_type) {
size = RoundUpTo(size, GetPageSizeCached());
uptr res = MmapNamed(nullptr, size, PROT_READ | PROT_WRITE,
MAP_PRIVATE | MAP_ANON, mem_type);
int reserrno;
if (UNLIKELY(internal_iserror(res, &reserrno))) {
if (reserrno == ENOMEM)
return nullptr;
ReportMmapFailureAndDie(size, mem_type, "allocate", reserrno);
}
IncreaseTotalMmap(size);
return (void *)res;
}
// We want to map a chunk of address space aligned to 'alignment'.
// We do it by mapping a bit more and then unmapping redundant pieces.
// We probably can do it with fewer syscalls in some OS-dependent way.
void *MmapAlignedOrDieOnFatalError(uptr size, uptr alignment,
const char *mem_type) {
CHECK(IsPowerOfTwo(size));
CHECK(IsPowerOfTwo(alignment));
uptr map_size = size + alignment;
uptr map_res = (uptr)MmapOrDieOnFatalError(map_size, mem_type);
if (UNLIKELY(!map_res))
return nullptr;
uptr map_end = map_res + map_size;
uptr res = map_res;
if (!IsAligned(res, alignment)) {
res = (map_res + alignment - 1) & ~(alignment - 1);
UnmapOrDie((void*)map_res, res - map_res);
}
uptr end = res + size;
if (end != map_end)
UnmapOrDie((void*)end, map_end - end);
return (void*)res;
}
void *MmapNoReserveOrDie(uptr size, const char *mem_type) {
size = RoundUpTo(size, GetPageSizeCached());
uptr p = MmapNamed(nullptr, size, PROT_READ | PROT_WRITE,
MAP_PRIVATE | MAP_ANON | MAP_NORESERVE, mem_type);
int reserrno;
if (UNLIKELY(internal_iserror(p, &reserrno)))
ReportMmapFailureAndDie(size, mem_type, "allocate noreserve", reserrno);
IncreaseTotalMmap(size);
return (void *)p;
}
static void *MmapFixedImpl(uptr fixed_addr, uptr size, bool tolerate_enomem,
const char *name) {
size = RoundUpTo(size, GetPageSizeCached());
fixed_addr = RoundDownTo(fixed_addr, GetPageSizeCached());
uptr p = MmapNamed((void *)fixed_addr, size, PROT_READ | PROT_WRITE,
MAP_PRIVATE | MAP_ANON | MAP_FIXED, name);
int reserrno;
if (UNLIKELY(internal_iserror(p, &reserrno))) {
if (tolerate_enomem && reserrno == ENOMEM)
return nullptr;
char mem_type[40];
internal_snprintf(mem_type, sizeof(mem_type), "memory at address 0x%zx",
fixed_addr);
ReportMmapFailureAndDie(size, mem_type, "allocate", reserrno);
}
IncreaseTotalMmap(size);
return (void *)p;
}
void *MmapFixedOrDie(uptr fixed_addr, uptr size, const char *name) {
return MmapFixedImpl(fixed_addr, size, false /*tolerate_enomem*/, name);
}
void *MmapFixedOrDieOnFatalError(uptr fixed_addr, uptr size, const char *name) {
return MmapFixedImpl(fixed_addr, size, true /*tolerate_enomem*/, name);
}
bool MprotectNoAccess(uptr addr, uptr size) {
return 0 == internal_mprotect((void*)addr, size, PROT_NONE);
}
bool MprotectReadOnly(uptr addr, uptr size) {
return 0 == internal_mprotect((void *)addr, size, PROT_READ);
}
#if !SANITIZER_MAC
void MprotectMallocZones(void *addr, int prot) {}
#endif
fd_t OpenFile(const char *filename, FileAccessMode mode, error_t *errno_p) {
if (ShouldMockFailureToOpen(filename))
return kInvalidFd;
int flags;
switch (mode) {
case RdOnly: flags = O_RDONLY; break;
case WrOnly: flags = O_WRONLY | O_CREAT | O_TRUNC; break;
case RdWr: flags = O_RDWR | O_CREAT; break;
}
fd_t res = internal_open(filename, flags, 0660);
if (internal_iserror(res, errno_p))
return kInvalidFd;
return ReserveStandardFds(res);
}
void CloseFile(fd_t fd) {
internal_close(fd);
}
bool ReadFromFile(fd_t fd, void *buff, uptr buff_size, uptr *bytes_read,
error_t *error_p) {
uptr res = internal_read(fd, buff, buff_size);
if (internal_iserror(res, error_p))
return false;
if (bytes_read)
*bytes_read = res;
return true;
}
bool WriteToFile(fd_t fd, const void *buff, uptr buff_size, uptr *bytes_written,
error_t *error_p) {
uptr res = internal_write(fd, buff, buff_size);
if (internal_iserror(res, error_p))
return false;
if (bytes_written)
*bytes_written = res;
return true;
}
void *MapFileToMemory(const char *file_name, uptr *buff_size) {
fd_t fd = OpenFile(file_name, RdOnly);
CHECK(fd != kInvalidFd);
uptr fsize = internal_filesize(fd);
CHECK_NE(fsize, (uptr)-1);
CHECK_GT(fsize, 0);
*buff_size = RoundUpTo(fsize, GetPageSizeCached());
uptr map = internal_mmap(nullptr, *buff_size, PROT_READ, MAP_PRIVATE, fd, 0);
return internal_iserror(map) ? nullptr : (void *)map;
}
void *MapWritableFileToMemory(void *addr, uptr size, fd_t fd, OFF_T offset) {
uptr flags = MAP_SHARED;
if (addr) flags |= MAP_FIXED;
uptr p = internal_mmap(addr, size, PROT_READ | PROT_WRITE, flags, fd, offset);
int mmap_errno = 0;
if (internal_iserror(p, &mmap_errno)) {
Printf("could not map writable file (%d, %lld, %zu): %zd, errno: %d\n",
fd, (long long)offset, size, p, mmap_errno);
return nullptr;
}
return (void *)p;
}
static inline bool IntervalsAreSeparate(uptr start1, uptr end1,
uptr start2, uptr end2) {
CHECK(start1 <= end1);
CHECK(start2 <= end2);
return (end1 < start2) || (end2 < start1);
}
// FIXME: this is thread-unsafe, but should not cause problems most of the time.
// When the shadow is mapped only a single thread usually exists (plus maybe
// several worker threads on Mac, which aren't expected to map big chunks of
// memory).
bool MemoryRangeIsAvailable(uptr range_start, uptr range_end) {
MemoryMappingLayout proc_maps(/*cache_enabled*/true);
if (proc_maps.Error())
return true; // and hope for the best
MemoryMappedSegment segment;
while (proc_maps.Next(&segment)) {
if (segment.start == segment.end) continue; // Empty range.
CHECK_NE(0, segment.end);
if (!IntervalsAreSeparate(segment.start, segment.end - 1, range_start,
range_end))
return false;
}
return true;
}
#if !SANITIZER_MAC
void DumpProcessMap() {
MemoryMappingLayout proc_maps(/*cache_enabled*/true);
const sptr kBufSize = 4095;
char *filename = (char*)MmapOrDie(kBufSize, __func__);
MemoryMappedSegment segment(filename, kBufSize);
Report("Process memory map follows:\n");
while (proc_maps.Next(&segment)) {
Printf("\t%p-%p\t%s\n", (void *)segment.start, (void *)segment.end,
segment.filename);
}
Report("End of process memory map.\n");
UnmapOrDie(filename, kBufSize);
}
#endif
const char *GetPwd() {
return GetEnv("PWD");
}
bool IsPathSeparator(const char c) {
return c == '/';
}
bool IsAbsolutePath(const char *path) {
return path != nullptr && IsPathSeparator(path[0]);
}
void ReportFile::Write(const char *buffer, uptr length) {
SpinMutexLock l(mu);
ReopenIfNecessary();
internal_write(fd, buffer, length);
}
bool GetCodeRangeForFile(const char *module, uptr *start, uptr *end) {
MemoryMappingLayout proc_maps(/*cache_enabled*/false);
InternalMmapVector<char> buff(kMaxPathLength);
MemoryMappedSegment segment(buff.data(), buff.size());
while (proc_maps.Next(&segment)) {
if (segment.IsExecutable() &&
internal_strcmp(module, segment.filename) == 0) {
*start = segment.start;
*end = segment.end;
return true;
}
}
return false;
}
uptr SignalContext::GetAddress() const {
auto si = static_cast<const siginfo_t *>(siginfo);
return (uptr)si->si_addr;
}
bool SignalContext::IsMemoryAccess() const {
auto si = static_cast<const siginfo_t *>(siginfo);
return si->si_signo == SIGSEGV || si->si_signo == SIGBUS;
}
int SignalContext::GetType() const {
return static_cast<const siginfo_t *>(siginfo)->si_signo;
}
const char *SignalContext::Describe() const {
switch (GetType()) {
case SIGFPE:
return "FPE";
case SIGILL:
return "ILL";
case SIGABRT:
return "ABRT";
case SIGSEGV:
return "SEGV";
case SIGBUS:
return "BUS";
case SIGTRAP:
return "TRAP";
}
return "UNKNOWN SIGNAL";
}
fd_t ReserveStandardFds(fd_t fd) {
CHECK_GE(fd, 0);
if (fd > 2)
return fd;
bool used[3];
internal_memset(used, 0, sizeof(used));
while (fd <= 2) {
used[fd] = true;
fd = internal_dup(fd);
}
for (int i = 0; i <= 2; ++i)
if (used[i])
internal_close(i);
return fd;
}
bool ShouldMockFailureToOpen(const char *path) {
return common_flags()->test_only_emulate_no_memorymap &&
internal_strncmp(path, "/proc/", 6) == 0;
}
#if SANITIZER_LINUX && !SANITIZER_ANDROID && !SANITIZER_GO
int GetNamedMappingFd(const char *name, uptr size, int *flags) {
if (!common_flags()->decorate_proc_maps || !name)
return -1;
char shmname[200];
CHECK(internal_strlen(name) < sizeof(shmname) - 10);
internal_snprintf(shmname, sizeof(shmname), "/dev/shm/%zu [%s]",
internal_getpid(), name);
int o_cloexec = 0;
#if defined(O_CLOEXEC)
o_cloexec = O_CLOEXEC;
#endif
int fd = ReserveStandardFds(
internal_open(shmname, O_RDWR | O_CREAT | O_TRUNC | o_cloexec, S_IRWXU));
CHECK_GE(fd, 0);
int res = internal_ftruncate(fd, size);
#if !defined(O_CLOEXEC)
res = fcntl(fd, F_SETFD, FD_CLOEXEC);
CHECK_EQ(0, res);
#endif
CHECK_EQ(0, res);
res = internal_unlink(shmname);
CHECK_EQ(0, res);
*flags &= ~(MAP_ANON | MAP_ANONYMOUS);
return fd;
}
#else
int GetNamedMappingFd(const char *name, uptr size, int *flags) {
return -1;
}
#endif
#if SANITIZER_ANDROID
#define PR_SET_VMA 0x53564d41
#define PR_SET_VMA_ANON_NAME 0
void DecorateMapping(uptr addr, uptr size, const char *name) {
if (!common_flags()->decorate_proc_maps || !name)
return;
internal_prctl(PR_SET_VMA, PR_SET_VMA_ANON_NAME, addr, size, (uptr)name);
}
#else
void DecorateMapping(uptr addr, uptr size, const char *name) {
}
#endif
uptr MmapNamed(void *addr, uptr length, int prot, int flags, const char *name) {
int fd = GetNamedMappingFd(name, length, &flags);
uptr res = internal_mmap(addr, length, prot, flags, fd, 0);
if (!internal_iserror(res))
DecorateMapping(res, length, name);
return res;
}
} // namespace __sanitizer
#endif // SANITIZER_POSIX
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