[all-commits] [llvm/llvm-project] eae30a: [rtsan] Add syscall interceptor (#118250)

[Chris Apple via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: eae30a240e34e1fd31b57096a1b8bdbd8b84352d
      https://github.com/llvm/llvm-project/commit/eae30a240e34e1fd31b57096a1b8bdbd8b84352d
  Author: Chris Apple <cja-private at pm.me>
  Date:   2024-12-02 (Mon, 02 Dec 2024)

  Changed paths:
    M compiler-rt/lib/rtsan/rtsan_interceptors_posix.cpp
    M compiler-rt/lib/rtsan/tests/rtsan_test_interceptors_posix.cpp
    A compiler-rt/test/rtsan/syscall.cpp

  Log Message:
  -----------
  [rtsan] Add syscall interceptor (#118250)

This is a complex one - `syscall` is used when people want to bypass
libc and make the call directly

However, this call:
* Has a variable amount of arguments (up to 6, typically)
* Has arguments that can be any type, (think of whatever arguments go in
to the libc call, or see more details here
https://syscalls.mebeim.net/?table=x86/64/x64/latest)


I've tried to put in a couple tests to ensure we aren't mucking with the
underlying functionality and they seem to be working.



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