[all-commits] [llvm/llvm-project] 951cf6: [sanitizer_common] Don't intercept __tls_get_addr ...

[rorth via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 951cf656b2faaf6fc0baa867293c0cb0ab131951
      https://github.com/llvm/llvm-project/commit/951cf656b2faaf6fc0baa867293c0cb0ab131951
  Author: Rainer Orth <ro at gcc.gnu.org>
  Date:   2023-01-17 (Tue, 17 Jan 2023)

  Changed paths:
    M compiler-rt/lib/sanitizer_common/sanitizer_platform_interceptors.h

  Log Message:
  -----------
  [sanitizer_common] Don't intercept __tls_get_addr on Solaris

When building/testing ASan inside the GCC tree on Solaris while using GNU
`ld` instead of Solaris `ld`, a large number of tests SEGVs on both sparc
and x86 like this:

  Thread 2 received signal SIGSEGV, Segmentation fault.
  [Switching to Thread 1 (LWP 1)]
  0xfe014cfc in __sanitizer::atomic_load<__sanitizer::atomic_uintptr_t>
(a=0xfc602a58, mo=__sanitizer::memory_order_acquire) at
sanitizer_common/sanitizer_atomic_clang_x86.h:46
  46	      v = a->val_dont_use;
  1: x/i $pc
  => 0xfe014cfc
<_ZN11__sanitizer11atomic_loadINS_16atomic_uintptr_tEEENT_4TypeEPVKS2_NS_12memory_orderE+62>:
mov (%eax),%eax
  (gdb) bt
  #0 0xfe014cfc in __sanitizer::atomic_load<__sanitizer::atomic_uintptr_t>
(a=0xfc602a58, mo=__sanitizer::memory_order_acquire) at
sanitizer_common/sanitizer_atomic_clang_x86.h:46
  #1 0xfe0bd1d7 in __sanitizer::DTLS_NextBlock (cur=0xfc602a58) at
sanitizer_common/sanitizer_tls_get_addr.cpp:53
  #2 0xfe0bd319 in __sanitizer::DTLS_Find (id=1) at
sanitizer_common/sanitizer_tls_get_addr.cpp:77
  #3 0xfe0bd466 in __sanitizer::DTLS_on_tls_get_addr (arg_void=0xfeffd068,
res=0xfe602a18, static_tls_begin=0, static_tls_end=0) at
sanitizer_common/sanitizer_tls_get_addr.cpp:116
  #4 0xfe063f81 in __interceptor___tls_get_addr (arg=0xfeffd068) at
sanitizer_common/sanitizer_common_interceptors.inc:5501
  #5 0xfe0a3054 in __sanitizer::CollectStaticTlsBlocks (info=0xfeffd108,
size=40, data=0xfeffd16c) at
sanitizer_common/sanitizer_linux_libcdep.cpp:366
  #6  0xfe6ba9fa in dl_iterate_phdr () from /usr/lib/ld.so.1
  #7 0xfe0a3132 in __sanitizer::GetStaticTlsBoundary (addr=0xfe608020,
size=0xfeffd244, align=0xfeffd1b0) at
sanitizer_common/sanitizer_linux_libcdep.cpp:382
  #8 0xfe0a33f7 in __sanitizer::GetTls (addr=0xfe608020, size=0xfeffd244)
at sanitizer_common/sanitizer_linux_libcdep.cpp:482
  #9 0xfe0a34b1 in __sanitizer::GetThreadStackAndTls (main=true,
stk_addr=0xfe608010, stk_size=0xfeffd240, tls_addr=0xfe608020,
tls_size=0xfeffd244) at sanitizer_common/sanitizer_linux_libcdep.cpp:565

The address being accessed is unmapped.  However, even when the tests
`PASS` with Solaris `ld`, `ASAN_OPTIONS=verbosity=2` shows

  ==6582==__tls_get_addr: Can't guess glibc version

Given that that the code is stricly `glibc`-specific according to
`sanitizer_tls_get_addr.h`, there seems little point in using the
interceptor on non-`glibc` targets.

That's what this patch does.  Tested on `i386-pc-solaris2.11` and
`sparc-sun-solaris2.11` inside the GCC tree.

Differential Revision: https://reviews.llvm.org/D141385