[all-commits] [llvm/llvm-project] 508398: [libc] Add hardening for FixedVector data structur...

[Alexey Samsonov via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 508398021d094ecfe6cea937d619c77121990e0d
      https://github.com/llvm/llvm-project/commit/508398021d094ecfe6cea937d619c77121990e0d
  Author: Alexey Samsonov <vonosmas at gmail.com>
  Date:   2025-01-08 (Wed, 08 Jan 2025)

  Changed paths:
    M libc/src/__support/CMakeLists.txt
    M libc/src/__support/fixedvector.h
    M libc/src/stdlib/exit_handler.h
    M utils/bazel/llvm-project-overlay/libc/BUILD.bazel

  Log Message:
  -----------
  [libc] Add hardening for FixedVector data structure and fix exposed bug. (#122159)

Add LIBC_ASSERT statements to FixedVector implementation, and zero out
the memory when the elements are removed to flag out-of-bound access and
dangling pointer/reference access.

This change unmasks the bug in one of FixedVector uses for atexit
handlers: dangling reference use, which was actually led to crashes in
the wild (with prod blockstore implementation). Fix it in this CL.



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