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Revert "[compiler-rt] Avoid generating coredumps when piped to a tool" (#85390)

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This reverts commit 27e5312a8bc8935f9c5620ff061c647d9fbcec85.

This commit broke some bots:
- clang-aarch64-sve-vla
https://lab.llvm.org/buildbot/#/builders/197/builds/13609
- clang-aarch64-sve-vls
https://lab.llvm.org/buildbot/#/builders/184/builds/10988
- clang-aarch64-lld-2stage
https://lab.llvm.org/buildbot/#/builders/185/builds/6312

https://github.com/llvm/llvm-project/pull/83701
This commit is contained in:
antoine moynault 2024-03-15 15:07:40 +01:00 committed by GitHub
parent 0ae76a7498
commit 0b9f19a988
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2 changed files with 2 additions and 24 deletions
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19
compiler-rt/lib/sanitizer_common/sanitizer_posix_libcdep.cpp
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@ -104,24 +104,7 @@ static void setlim(int res, rlim_t lim) {
void DisableCoreDumperIfNecessary() {
if (common_flags()->disable_coredump) {
rlimit rlim;
CHECK_EQ(0, getrlimit(RLIMIT_CORE, &rlim));
// On Linux, if the kernel.core_pattern sysctl starts with a '|' (i.e. it
// is being piped to a coredump handler such as systemd-coredumpd), the
// kernel ignores RLIMIT_CORE (since we aren't creating a file in the file
// system) except for the magic value of 1, which disables coredumps when
// piping. 1 byte is too small for any kind of valid core dump, so it
// also disables coredumps if kernel.core_pattern creates files directly.
// While most piped coredump handlers do respect the crashing processes'
// RLIMIT_CORE, this is notable not the case for Debian's systemd-coredump
// due to a local patch that changes sysctl.d/50-coredump.conf to ignore
// the specified limit and instead use RLIM_INFINITY.
//
// The alternative to using RLIMIT_CORE=1 would be to use prctl() with the
// PR_SET_DUMPABLE flag, however that also prevents ptrace(), so makes it
// impossible to attach a debugger.
rlim.rlim_cur = Min<rlim_t>(SANITIZER_LINUX ? 1 : 0, rlim.rlim_max);
CHECK_EQ(0, setrlimit(RLIMIT_CORE, &rlim));
setlim(RLIMIT_CORE, 0);
}
}

7
compiler-rt/test/sanitizer_common/TestCases/corelimit.cpp
View File

@ -10,12 +10,7 @@ int main() {
getrlimit(RLIMIT_CORE, &lim_core);
void *p;
if (sizeof(p) == 8) {
#ifdef __linux__
// See comments in DisableCoreDumperIfNecessary().
assert(lim_core.rlim_cur == 1);
#else
assert(lim_core.rlim_cur == 0);
#endif
assert(0 == lim_core.rlim_cur);
}
return 0;
}