[PATCH] D146858: [msan] Fix handling of ParamTLS overflow.

[Evgenii Stepanov via Phabricator via llvm-commits]

eugenis created this revision.
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Ironically, MSan copies uninitialized data off the stack into
VAArgTLSCopy in the callee-side handling of va_start. Clamp the copy
size to the actual length of the buffer, and zero-initialize the
remainder.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D146858

Files:
  llvm/lib/Transforms/Instrumentation/MemorySanitizer.cpp
  llvm/test/Instrumentation/MemorySanitizer/Mips/vararg-mips64.ll
  llvm/test/Instrumentation/MemorySanitizer/Mips/vararg-mips64el.ll
  llvm/test/Instrumentation/MemorySanitizer/PowerPC/vararg-ppc64.ll
  llvm/test/Instrumentation/MemorySanitizer/PowerPC/vararg-ppc64le.ll
  llvm/test/Instrumentation/MemorySanitizer/msan_debug_info.ll
  llvm/test/Instrumentation/MemorySanitizer/msan_kernel_basic.ll

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