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[sanitizer] Handle nullptr name in prctl(PR_SET_VMA, PR_SET_VMA_ANON_NAME) (#160824)

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### Summary
This PR resolves https://github.com/llvm/llvm-project/issues/160562
This commit is contained in:
woruyu
2025-09-30 10:45:20 +08:00
committed by GitHub
parent 978644c29f
commit eb1960c481
2 changed files with 4 additions and 1 deletions
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2
compiler-rt/lib/sanitizer_common/sanitizer_common_interceptors.inc
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@@ -1326,7 +1326,7 @@ PRCTL_INTERCEPTOR(int, prctl, int option, unsigned long arg2,
static const int PR_SET_SECCOMP = 22;
static const int SECCOMP_MODE_FILTER = 2;
# endif
if (option == PR_SET_VMA && arg2 == 0UL) {
if (option == PR_SET_VMA && arg2 == 0UL && arg5 != 0UL) {
char *name = (char *)arg5;
COMMON_INTERCEPTOR_READ_RANGE(ctx, name, internal_strlen(name) + 1);
}

3
compiler-rt/test/sanitizer_common/TestCases/Linux/prctl.cpp
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@@ -88,5 +88,8 @@ int main() {
res = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &pr);
assert(res == -1);
unsigned long name = reinterpret_cast<unsigned long>(nullptr);
prctl(PR_SET_VMA, PR_SET_VMA_ANON_NAME, 0, nullptr, name);
return 0;
}