[all-commits] [llvm/llvm-project] b1bd52: Fix tls_get_addr handling for glibc >=2.25

[Thurston Dang via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: b1bd52cd0d8627df1187448b8247a9c7a4675019
      https://github.com/llvm/llvm-project/commit/b1bd52cd0d8627df1187448b8247a9c7a4675019
  Author: Thurston Dang <thurston at google.com>
  Date:   2023-04-14 (Fri, 14 Apr 2023)

  Changed paths:
    M compiler-rt/lib/sanitizer_common/sanitizer_allocator_interface.h
    M compiler-rt/lib/sanitizer_common/sanitizer_tls_get_addr.cpp
    M compiler-rt/lib/sanitizer_common/sanitizer_tls_get_addr.h
    M compiler-rt/test/msan/dtls_test.c

  Log Message:
  -----------
  Fix tls_get_addr handling for glibc >=2.25

This changes the sanitizers' tls_get_addr handling from
a heuristic check of __signal_safe_memalign allocations
(which has only been used in a since deprecated version
of Google's runtime), to using the sanitizers' interface
function to check if it is a malloc allocation (used
since glibc >= 2.25).

This is one of the approaches proposed by Keno in
https://github.com/google/sanitizers/issues/1409#issuecomment-1214244142

This moves the weak annotation of __sanitizer_get_allocated_size/begin from the header to sanitizer_tls_get_addr.cpp, as suggested by Vitaly in D148060.

Reviewed By: vitalybuka

Differential Revision: https://reviews.llvm.org/D147459