40 lines · cpp
1// RUN: %clangxx_asan -O0 %s -o %t && not %run %t 2>&1 | FileCheck %s2// RUN: %clangxx_asan -O1 %s -o %t && not %run %t 2>&1 | FileCheck %s3// RUN: %clangxx_asan -O2 %s -o %t && not %run %t 2>&1 | FileCheck %s4// RUN: %clangxx_asan -O3 %s -o %t && not %run %t 2>&1 | FileCheck %s5 6// REQUIRES: compiler-rt-optimized7// REQUIRES: stable-runtime8 9#include "defines.h"10#include <stdlib.h>11#include <string.h>12 13// We need a way to prevent the optimize from eliminating the14// strncpy below (which otherwises writes to dead storage). We15// need the read to be out-of-line to prevent memory forwarding16// from making the memory dead again.17int ATTRIBUTE_NOINLINE sink_memory(int N, char *p);18int sink_memory(int N, char *p) {19 int sum = 0;20 for (int i = 0; i < N; i++)21 sum += p[i];22 return sum;23}24 25int main(int argc, char **argv) {26 char *hello = (char*)malloc(6);27 strcpy(hello, "hello");28 int rval = sink_memory(6, hello);29 char *short_buffer = (char*)malloc(9);30 strncpy(short_buffer, hello, 10); // BOOM31 // CHECK: {{WRITE of size 10 at 0x.* thread T0}}32 // CHECK: {{ #0 0x.* in .*strncpy}}33 // CHECK: {{ #1 0x.* in main .*strncpy-overflow.cpp:}}[[@LINE-3]]34 // CHECK: {{0x.* is located 0 bytes after 9-byte region}}35 // CHECK: {{allocated by thread T0 here:}}36 // CHECK: {{ #0 0x.* in .*malloc}}37 // CHECK: {{ #[1-3] 0x.* in main .*strncpy-overflow.cpp:}}[[@LINE-8]]38 return rval + sink_memory(9, short_buffer);39}40