[HWASAN] Add memset interceptor (llvm#71244)

Co-authored-by: Vitaly Buka <[email protected]>

Author: kstoimenov

compiler-rt/lib/hwasan/hwasan_interceptors.cpp

@@ -19,6 +19,7 @@
 #include "hwasan.h"
 #include "hwasan_allocator.h"
 #include "hwasan_checks.h"
+#include "hwasan_mapping.h"
 #include "hwasan_platform_interceptors.h"
 #include "hwasan_thread.h"
 #include "hwasan_thread_list.h"
@@ -146,13 +147,16 @@ struct HWAsanInterceptorContext {
         (void)(name);                           \
       } while (false)
 
-#    define COMMON_INTERCEPTOR_MEMSET_IMPL(ctx, block, c, size) \
-      do {                                                      \
-        (void)(ctx);                                            \
-        (void)(block);                                          \
-        (void)(c);                                              \
-        (void)(size);                                           \
-      } while (false)
+#    define COMMON_INTERCEPTOR_MEMSET_IMPL(ctx, dst, v, size)   \
+      {                                                         \
+        if (COMMON_INTERCEPTOR_NOTHING_IS_INITIALIZED)          \
+          return internal_memset(dst, v, size);                 \
+        COMMON_INTERCEPTOR_ENTER(ctx, memset, dst, v, size);    \
+        if (MemIsApp(UntagAddr(reinterpret_cast<uptr>(dst))) && \
+            common_flags()->intercept_intrin)                   \
+          COMMON_INTERCEPTOR_WRITE_RANGE(ctx, dst, size);       \
+        return REAL(memset)(dst, v, size);                      \
+      }
 
 #    define COMMON_INTERCEPTOR_STRERROR() \
       do {                                \

compiler-rt/lib/hwasan/hwasan_platform_interceptors.h

@@ -56,8 +56,8 @@
 #undef SANITIZER_INTERCEPT_STRCASECMP
 #define SANITIZER_INTERCEPT_STRCASECMP 0
 
-#undef SANITIZER_INTERCEPT_MEMSET
-#define SANITIZER_INTERCEPT_MEMSET 0
+// #undef SANITIZER_INTERCEPT_MEMSET
+// #define SANITIZER_INTERCEPT_MEMSET 0
 
 // #undef SANITIZER_INTERCEPT_MEMMOVE
 // #define SANITIZER_INTERCEPT_MEMMOVE 0

compiler-rt/test/hwasan/TestCases/memset.cpp

@@ -0,0 +1,32 @@
+// RUN: %clangxx_hwasan -O0 %s -o %t && not %run %t 2>&1 | FileCheck %s
+// RUN: %clangxx_hwasan -O1 %s -o %t && not %run %t 2>&1 | FileCheck %s
+// RUN: %clangxx_hwasan -O2 %s -o %t && not %run %t 2>&1 | FileCheck %s
+// RUN: %clangxx_hwasan -O3 %s -o %t && not %run %t 2>&1 | FileCheck %s
+
+#include <sanitizer/hwasan_interface.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+__attribute__((no_sanitize("hwaddress"))) void
+ForceCallInterceptor(void *p, int c, size_t size) {
+  memset(p, c, size) == nullptr;
+}
+
+int main(int argc, char **argv) {
+  __hwasan_enable_allocator_tagging();
+  char a[] = {static_cast<char>(argc), 2, 3, 4};
+  int size = sizeof(a);
+  char *volatile p = (char *)malloc(size);
+  free(p);
+  ForceCallInterceptor(p, 0, size);
+  return 0;
+  // CHECK: HWAddressSanitizer: tag-mismatch on address
+  // CHECK: WRITE of size 4
+  // CHECK: #{{[[:digit:]]+}} 0x{{[[:xdigit:]]+}} in main {{.*}}memset.cpp:[[@LINE-4]]
+  // CHECK: Cause: use-after-free
+  // CHECK: freed by thread
+  // CHECK: #{{[[:digit:]]+}} 0x{{[[:xdigit:]]+}} in main {{.*}}memset.cpp:[[@LINE-8]]
+  // CHECK: previously allocated by thread
+  // CHECK: #{{[[:digit:]]+}} 0x{{[[:xdigit:]]+}} in main {{.*}}memset.cpp:[[@LINE-11]]
+}