[Scudo] Use GWP-ASan's aligned allocations and fixup postalloc hooks.
This patch does a few cleanup things:
1. The non-standalone scudo has a problem where GWP-ASan allocations
may not meet alignment requirements where Scudo was requested to have
alignment >= 16. Use the new GWP-ASan API to fix this.
2. The standalone variant loses some debugging information inside of
GWP-ASan because we ask GWP-ASan to allocate an aligned size in the
frontend. This means reports end up with 'UaF on a 16-byte allocation'
for a 1-byte allocation with 16-byte alignment. Also use the new API to
fix this.
3. Add post-alloc hooks for GWP-ASan intercepted allocations, and add
stats tracking for GWP-ASan allocations.
4. Add a small test that checks the alignment of the frontend
allocator, so that it can be used under GWP-ASan torture mode.
5. Add GWP-ASan torture mode as a testing configuration to catch these
regressions.
Depends on D94830, D95889.
Reviewed By: cryptoad
Differential Revision: https://reviews.llvm.org/D95884
GitOrigin-RevId: e78b64df98878d1da56275e0c272ed58364da3ad
Change-Id: I9b7f7503e1b1fc3a57788e84231714588d796b5c
diff --git a/gwp_asan/common.h b/gwp_asan/common.h
index ee8f9d1..7ce367e 100644
--- a/gwp_asan/common.h
+++ b/gwp_asan/common.h
@@ -83,6 +83,8 @@
// crash handler. This, in conjunction with the Metadata array, forms the entire
// set of information required for understanding a GWP-ASan crash.
struct AllocatorState {
+ constexpr AllocatorState() {}
+
// Returns whether the provided pointer is a current sampled allocation that
// is owned by this pool.
GWP_ASAN_ALWAYS_INLINE bool pointerIsMine(const void *Ptr) const {
