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[sanitizer_common] Block asynchronous signals only #98200

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Merged
merged 2 commits into from
Jul 10, 2024
Merged

[sanitizer_common] Block asynchronous signals only #98200

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6a744ae
[sanitizer_common] Add option to block only asynchronous signals
thurstond Jul 9, 2024
da136f9
Unconditionally block asynchronous signals only
thurstond Jul 10, 2024
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18 changes: 15 additions & 3 deletions compiler-rt/lib/sanitizer_common/sanitizer_linux.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -155,7 +155,9 @@ void SetSigProcMask(__sanitizer_sigset_t *set, __sanitizer_sigset_t *oldset) {
CHECK_EQ(0, internal_sigprocmask(SIG_SETMASK, set, oldset));
}

void BlockSignals(__sanitizer_sigset_t *oldset) {
// If block_async_only is true: blocks only asynchronous signals; otherwise,
// blocks (nearly) all signals.
void BlockSignals(__sanitizer_sigset_t *oldset, bool block_async_only) {
__sanitizer_sigset_t set;
internal_sigfillset(&set);
# if SANITIZER_LINUX && !SANITIZER_ANDROID
Expand All @@ -170,11 +172,21 @@ void BlockSignals(__sanitizer_sigset_t *oldset) {
// hang.
internal_sigdelset(&set, 31);
# endif
if (block_async_only) {
internal_sigdelset(&set, SIGSEGV);
internal_sigdelset(&set, SIGBUS);
internal_sigdelset(&set, SIGILL);
internal_sigdelset(&set, SIGTRAP);
internal_sigdelset(&set, SIGABRT);
internal_sigdelset(&set, SIGFPE);
internal_sigdelset(&set, SIGPIPE);
}
SetSigProcMask(&set, oldset);
}

ScopedBlockSignals::ScopedBlockSignals(__sanitizer_sigset_t *copy) {
BlockSignals(&saved_);
ScopedBlockSignals::ScopedBlockSignals(__sanitizer_sigset_t *copy,
bool block_async_only) {
BlockSignals(&saved_, block_async_only);
if (copy)
internal_memcpy(copy, &saved_, sizeof(saved_));
}
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6 changes: 4 additions & 2 deletions compiler-rt/lib/sanitizer_common/sanitizer_linux.h
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Original file line number Diff line number Diff line change
Expand Up @@ -51,9 +51,11 @@ uptr internal_sigprocmask(int how, __sanitizer_sigset_t *set,
__sanitizer_sigset_t *oldset);

void SetSigProcMask(__sanitizer_sigset_t *set, __sanitizer_sigset_t *oldset);
void BlockSignals(__sanitizer_sigset_t *oldset = nullptr);
void BlockSignals(__sanitizer_sigset_t *oldset = nullptr,
bool block_async_only = false);
struct ScopedBlockSignals {
explicit ScopedBlockSignals(__sanitizer_sigset_t *copy);
explicit ScopedBlockSignals(__sanitizer_sigset_t *copy,
bool block_async_only = false);
~ScopedBlockSignals();

ScopedBlockSignals &operator=(const ScopedBlockSignals &) = delete;
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