[all-commits] [llvm/llvm-project] 292b30: [libc][bug] Fix out of bound write in memcpy w/ so...

[Guillaume Chatelet via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 292b300c5131e54b9977305bb4aca9a03e1b4fed
      https://github.com/llvm/llvm-project/commit/292b300c5131e54b9977305bb4aca9a03e1b4fed
  Author: Guillaume Chatelet <gchatelet at google.com>
  Date:   2024-05-14 (Tue, 14 May 2024)

  Changed paths:
    M libc/src/string/memory_utils/x86_64/inline_memcpy.h
    M libc/test/src/string/memcpy_test.cpp
    A libc/test/src/string/memory_utils/protected_pages.h
    M libc/test/src/string/memset_test.cpp

  Log Message:
  -----------
  [libc][bug] Fix out of bound write in memcpy w/ software prefetching (#90591)

This patch adds tests for `memcpy` and `memset` making sure that we
don't access buffers out of bounds. It relies on POSIX `mmap` /
`mprotect` and works only when FULL_BUILD_MODE is disabled.

The bug showed up while enabling software prefetching.
`loop_and_tail_offset` is always running at least one iteration but in
some configurations loop unrolled prefetching was actually needing only
the tail operation and no loop iterations at all.



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