[PATCH] D63469: hwasan: Teach the runtime to identify the local variable being accessed in UAR reports.

[Peter Collingbourne via Phabricator via llvm-commits]

pcc created this revision.
pcc added a reviewer: eugenis.
Herald added subscribers: Sanitizers, kubamracek.
Herald added projects: Sanitizers, LLVM.
pcc added a child revision: D63470: hwasan: Remove the old frame descriptor mechanism..

Each function's PC is recorded in the ring buffer. From there we can access
the function's local variables and reconstruct the tag of each one with the
help of the information printed by llvm-symbolizer's new FRAME command. We
can then find the variable that was likely being accessed by matching the
pointer's tag against the reconstructed tag.

Depends on D63300 <https://reviews.llvm.org/D63300>

Depends on D63468 <https://reviews.llvm.org/D63468>


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D63469

Files:
  compiler-rt/lib/hwasan/hwasan.cpp
  compiler-rt/lib/hwasan/hwasan.h
  compiler-rt/lib/hwasan/hwasan_report.cpp
  compiler-rt/lib/sanitizer_common/sanitizer_ring_buffer.h
  compiler-rt/lib/sanitizer_common/sanitizer_symbolizer.cc
  compiler-rt/lib/sanitizer_common/sanitizer_symbolizer.h
  compiler-rt/lib/sanitizer_common/sanitizer_symbolizer_internal.h
  compiler-rt/lib/sanitizer_common/sanitizer_symbolizer_libcdep.cc
  compiler-rt/test/hwasan/TestCases/stack-uar.c

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