[all-commits] [llvm/llvm-project] 92a870: [compiler-rt] Map internal_sigaction to __sys_siga...

[Alexander Richardson via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 92a870888c2d19f0004d2d0bc90730559c6bf0f4
      https://github.com/llvm/llvm-project/commit/92a870888c2d19f0004d2d0bc90730559c6bf0f4
  Author: Alexander Richardson <alexrichardson at google.com>
  Date:   2024-06-07 (Fri, 07 Jun 2024)

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

  Log Message:
  -----------
  [compiler-rt] Map internal_sigaction to __sys_sigaction on FreeBSD (#84441)

This function is called during very early startup and which can result
in a crash on FreeBSD. The sigaction() function in libc is indirected
via a table so that it can be interposed by the threading library
rather than calling the syscall directly. In the crash I was observing
this table had not yet been relocated, so we ended up jumping to an
invalid address. To avoid this problem we can call __sys_sigaction,
which calls the syscall directly and in FreeBSD 15 is part of libsys
rather than libc, so does not depend on libc being fully initialized.



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