[compiler-rt] [compiler-rt][asan] _aligned_malloc/_aligned_free interception. (PR #82049)

[via llvm-commits]

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@@ -0,0 +1,25 @@
+// RUN: %clang_cl_asan %Od %s %Fe%t
+// RUN: %run %t
+
+#include <windows.h>
+
+#define CHECK_ALIGNED(ptr, alignment)                                          \
+  do {                                                                         \
+    if (((uintptr_t)(ptr) % (alignment)) != 0)                                 \
+      return __LINE__;                                                         \
+  } while (0)
+
+int main(void) {
+  char *p = reinterpret_cast<char *>(_aligned_malloc(16, 8));
+  CHECK_ALIGNED(p, 8);
+  char *n = reinterpret_cast<char *>(_aligned_realloc(32, 16));
+  CHECK_ALIGNED(n, 16);
+  _aligned_free(n);
+  p = reinterpret_cast<char *>(_aligned_malloc(128, 8));
+  CHECK_ALIGNED(p, 8);
+  p[-1] = 'a';
+  // CHECK: AddressSanitizer: heap-buffer-overflow on address [[ADDR:0x[0-9a-f]+]]
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zmodem wrote:

There needs to be a FileCheck invocation on the RUN line for the CHECKs to get checked.

Also, can we update compiler-rt/test/asan/TestCases/Windows/aligned_mallocs.cpp instead of adding a new one?

https://github.com/llvm/llvm-project/pull/82049