[compiler-rt] [asan] NPD calling prctl with PR_SET_VMA PR_SET_VMA_ANON_NAME and nullptr for name (PR #160824)

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llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-compiler-rt-sanitizer

Author: woruyu (woruyu)

<details>
<summary>Changes</summary>

### Summary
This PR resolves https://github.com/llvm/llvm-project/issues/160562

---
Full diff: https://github.com/llvm/llvm-project/pull/160824.diff


2 Files Affected:

- (modified) compiler-rt/lib/sanitizer_common/sanitizer_common_interceptors.inc (+1-1) 
- (modified) compiler-rt/test/sanitizer_common/TestCases/Linux/prctl.cpp (+4) 


``````````diff
diff --git a/compiler-rt/lib/sanitizer_common/sanitizer_common_interceptors.inc b/compiler-rt/lib/sanitizer_common/sanitizer_common_interceptors.inc
index a96d325d08983..b10ce7fa44afc 100644
--- a/compiler-rt/lib/sanitizer_common/sanitizer_common_interceptors.inc
+++ b/compiler-rt/lib/sanitizer_common/sanitizer_common_interceptors.inc
@@ -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);
   }
diff --git a/compiler-rt/test/sanitizer_common/TestCases/Linux/prctl.cpp b/compiler-rt/test/sanitizer_common/TestCases/Linux/prctl.cpp
index dab1d1b48f868..a3bbeac15e906 100644
--- a/compiler-rt/test/sanitizer_common/TestCases/Linux/prctl.cpp
+++ b/compiler-rt/test/sanitizer_common/TestCases/Linux/prctl.cpp
@@ -88,5 +88,9 @@ int main() {
   res = prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER, &pr);
   assert(res == -1);
 
+  unsigned long name = reinterpret_cast<unsigned long>(nullptr);
+  res = prctl(PR_SET_VMA, PR_SET_VMA_ANON_NAME, 0, 0, nullptr, name);
+  assert(res == 0);
+
   return 0;
 }

``````````

</details>


https://github.com/llvm/llvm-project/pull/160824