File: intercept_strdup.cpp

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llvm-toolchain-17 1%3A17.0.6-22
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// RUN: %clang_cl_asan %Od %s %Fe%t
// RUN: not %run %t 2>&1 | FileCheck %s

#include <stdio.h>
#include <string.h>
#include <malloc.h>

int main() {
  char *ptr = _strdup("Hello");
  int subscript = 1;
  ptr[subscript] = '3';
  printf("%s\n", ptr);
  fflush(0);
// CHECK: H3llo

  subscript = -1;
  ptr[subscript] = 42;
// CHECK: AddressSanitizer: heap-buffer-overflow on address [[ADDR:0x[0-9a-f]+]]
// CHECK: WRITE of size 1 at [[ADDR]] thread T0
// CHECK:   {{#0 .* main .*}}intercept_strdup.cpp:[[@LINE-3]]
// CHECK: [[ADDR]] is located 1 bytes before 6-byte region
// CHECK: allocated by thread T0 here:
//
// The first frame is our wrapper normally but will be malloc in the dynamic
// config.
// CHECK:   #0 {{.*}} in {{malloc|strdup}}
//
// The local call to _strdup above may be the second or third frame depending
// on whether we're using the dynamic config.
// CHECK:   #{{[12]}} {{.*}} in main {{.*}}intercept_strdup.cpp:[[@LINE-21]]
  free(ptr);
}