[all-commits] [llvm/llvm-project] 4688df: Avoid partial munmap (#92109)

[Stephan Bergmann via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 4688df68f9d022dd8bc102675a9e86ad274355d6
      https://github.com/llvm/llvm-project/commit/4688df68f9d022dd8bc102675a9e86ad274355d6
  Author: Stephan Bergmann <sbergman at redhat.com>
  Date:   2024-05-15 (Wed, 15 May 2024)

  Changed paths:
    M compiler-rt/lib/sanitizer_common/sanitizer_suppressions.cpp

  Log Message:
  -----------
  Avoid partial munmap (#92109)

...which caused issues like

> ==42==ERROR: AddressSanitizer failed to deallocate 0x32 (50) bytes at
address 0x117e0000 (error code: 28)
> ==42==Cannot dump memory map on emscriptenAddressSanitizer: CHECK
failed: sanitizer_common.cpp:81 "((0 && "unable to unmmap")) != (0)"
(0x0, 0x0) (tid=288045824)
> #0 0x14f73b0c in __asan::CheckUnwind()+0x14f73b0c
(this.program+0x14f73b0c)
> #1 0x14f8a3c2 in __sanitizer::CheckFailed(char const*, int, char
const*, unsigned long long, unsigned long long)+0x14f8a3c2
(this.program+0x14f8a3c2)
> #2 0x14f7d6e1 in __sanitizer::ReportMunmapFailureAndDie(void*,
unsigned long, int, bool)+0x14f7d6e1 (this.program+0x14f7d6e1)
> #3 0x14f81fbd in __sanitizer::UnmapOrDie(void*, unsigned
long)+0x14f81fbd (this.program+0x14f81fbd)
> #4 0x14f875df in __sanitizer::SuppressionContext::ParseFromFile(char
const*)+0x14f875df (this.program+0x14f875df)
> #5 0x14f74eab in __asan::InitializeSuppressions()+0x14f74eab
(this.program+0x14f74eab)
> #6 0x14f73a1a in __asan::AsanInitInternal()+0x14f73a1a
(this.program+0x14f73a1a)

when trying to use an ASan suppressions file under Emscripten: Even
though it would be considered OK by SUSv4, the Emscripten runtime states
"We don't support partial munmapping" (see

<https://github.com/emscripten-core/emscripten/commit/f4115eb2c36bac741685300273cb9fa186d719e1>
"Implement MAP_ANONYMOUS on top of malloc in STANDALONE_WASM mode
(#16289)").

Co-authored-by: Stephan Bergmann <stephan.bergmann at allotropia.de>



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