Summary:
Add a recursivity guard for GPA::allocate(). This means that any
recursive allocations will fall back to the supporting allocator. In future
patches, we will introduce stack trace collection support. The unwinder will be
provided by the supporting allocator, and we can't guarantee they don't call
malloc() (e.g. backtrace() on posix may call dlopen(), which may call malloc().
Furthermore, this patch packs the new TLS recursivity guard into a thread local
struct, so that TLS variables should be hopefully not fall across cache lines.
Reviewers: vlad.tsyrklevich, morehouse, eugenis
Reviewed By: eugenis
Subscribers: kubamracek, #sanitizers, llvm-commits, eugenis
Tags: #sanitizers, #llvm
Differential Revision: https://reviews.llvm.org/D63736
llvm-svn: 364356
Summary:
See D60593 for further information.
This patch introduces the core of GWP-ASan, being the guarded pool allocator. This class contains the logic for creating and maintaining allocations in the guarded pool. Its public interface is to be utilised by supporting allocators in order to provide sampled guarded allocation behaviour.
This patch also contains basic functionality tests of the allocator as unittests. The error-catching behaviour will be tested in upcoming patches that use Scudo as an implementing allocator.
Reviewers: vlad.tsyrklevich, eugenis, jfb
Reviewed By: vlad.tsyrklevich
Subscribers: dexonsmith, kubamracek, mgorny, cryptoad, jfb, #sanitizers, llvm-commits, morehouse
Tags: #sanitizers, #llvm
Differential Revision: https://reviews.llvm.org/D62872
llvm-svn: 362636
Mitch Phillips