[all-commits] [llvm/llvm-project] 4a264c: [sanitizer_common] Fix GetArgsAndEnv on Linux/spar...

[Rainer Orth via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 4a264c559922a8754a0e28fbf316ba667ec19798
      https://github.com/llvm/llvm-project/commit/4a264c559922a8754a0e28fbf316ba667ec19798
  Author: Rainer Orth <ro at gcc.gnu.org>
  Date:   2024-09-24 (Tue, 24 Sep 2024)

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

  Log Message:
  -----------
  [sanitizer_common] Fix GetArgsAndEnv on Linux/sparc64 (#109109)

When ASan testing is enabled on SPARC as per PR #107405, the
```
  AddressSanitizer-sparc-linux :: TestCases/Posix/print_cmdline.cpp
```
test `FAIL`s. Either `ASAN_OPTIONS=print_cmdline=true` yielded binary
garbage in the `Command:` output or just an empty string.

It turns out one needs to apply an offset to `__libc_stack_end` to get
at the actual `argc`/`argv`, as described in `glibc`'s
`sysdeps/sparc/sparc{32,64}/dl-machine.h` (`DL_STACK_END`).

This patch does this, fixing the test.

Tested on `sparc64-unknown-linux-gnu`.



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