Imported Upstream version 6.10.0.49

Former-commit-id: 1d6753294b2993e1fbf92de9366bb9544db4189b

external/llvm-project/compiler-rt/test/asan/TestCases/Posix/fread_fwrite.cc

@@ -0,0 +1,34 @@
+// RUN: %clangxx_asan -g %s -o %t
+// RUN: not %run %t 2>&1 | FileCheck %s --check-prefix=CHECK-FWRITE
+// RUN: not %run %t 1 2>&1 | FileCheck %s --check-prefix=CHECK-FREAD
+
+#include <stdio.h>
+#include <stdlib.h>
+
+int test_fread() {
+  FILE *f = fopen("/dev/zero", "r");
+  char buf[2];
+  fread(buf, sizeof(buf), 2, f); // BOOM
+  fclose(f);
+  return 0;
+}
+
+int test_fwrite() {
+  FILE *f = fopen("/dev/null", "w");
+  char buf[2];
+  fwrite(buf, sizeof(buf), 2, f); // BOOM
+  return fclose(f);
+}
+
+int main(int argc, char *argv[]) {
+  if (argc > 1)
+    test_fread();
+  else
+    test_fwrite();
+  return 0;
+}
+
+// CHECK-FREAD: {{.*ERROR: AddressSanitizer: stack-buffer-overflow}}
+// CHECK-FREAD: #{{.*}} in {{(wrap_|__interceptor_)?}}fread
+// CHECK-FWRITE: {{.*ERROR: AddressSanitizer: stack-buffer-overflow}}
+// CHECK-FWRITE: #{{.*}} in {{(wrap_|__interceptor_)?}}fwrite