[compiler-rt] [MSan] Fix wrong unpoison size in SignalAction (PR #144071)
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Fri Jun 13 05:57:52 PDT 2025
llvmbot wrote:
<!--LLVM PR SUMMARY COMMENT-->
@llvm/pr-subscribers-compiler-rt-sanitizer
Author: Kunqiu Chen (Camsyn)
<details>
<summary>Changes</summary>
MSan should unpoison the parameters of extended signal handlers.
However, MSan unpoisoned the second parameter with the wrong size
`sizeof(__sanitizer_sigaction)`, inconsistent with its real type
`siginfo_t`.
This commit fixes this issue by correcting the size to
`sizeof(__sanitizer_siginfo)`.
---
Full diff: https://github.com/llvm/llvm-project/pull/144071.diff
1 Files Affected:
- (modified) compiler-rt/lib/msan/msan_interceptors.cpp (+1-1)
``````````diff
diff --git a/compiler-rt/lib/msan/msan_interceptors.cpp b/compiler-rt/lib/msan/msan_interceptors.cpp
index 76255cdb742a3..f94d3cb79aa00 100644
--- a/compiler-rt/lib/msan/msan_interceptors.cpp
+++ b/compiler-rt/lib/msan/msan_interceptors.cpp
@@ -1127,7 +1127,7 @@ static void SignalAction(int signo, void *si, void *uc) {
SignalHandlerScope signal_handler_scope;
ScopedThreadLocalStateBackup stlsb;
UnpoisonParam(3);
- __msan_unpoison(si, sizeof(__sanitizer_sigaction));
+ __msan_unpoison(si, sizeof(__sanitizer_siginfo));
__msan_unpoison(uc, ucontext_t_sz(uc));
typedef void (*sigaction_cb)(int, void *, void *);
``````````
</details>
https://github.com/llvm/llvm-project/pull/144071
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