1 // RUN: %clangxx_asan -O0 %s -o %t && not %run %t 2>&1 | FileCheck %s 2 // RUN: %clangxx_asan -O1 %s -o %t && not %run %t 2>&1 | FileCheck %s 3 // RUN: %clangxx_asan -O2 %s -o %t && not %run %t 2>&1 | FileCheck %s 4 // RUN: %clangxx_asan -O3 %s -o %t && not %run %t 2>&1 | FileCheck %s 5 6 // REQUIRES: compiler-rt-optimized 7 // REQUIRES: stable-runtime 8 9 #include <string.h> 10 #include <stdlib.h> 11 12 // We need a way to prevent the optimize from eliminating the 13 // strncpy below (which otherwises writes to dead storage). We 14 // need the read to be out-of-line to prevent memory forwarding 15 // from making the memory dead again. 16 int sink_memory(int N, char *p) __attribute__((noinline)); 17 int sink_memory(int N, char *p) { 18 int sum = 0; 19 for (int i = 0; i < N; i++) 20 sum += p[i]; 21 return sum; 22 } 23 24 int main(int argc, char **argv) { 25 char *hello = (char*)malloc(6); 26 strcpy(hello, "hello"); 27 int rval = sink_memory(6, hello); 28 char *short_buffer = (char*)malloc(9); 29 strncpy(short_buffer, hello, 10); // BOOM 30 // CHECK: {{WRITE of size 10 at 0x.* thread T0}} 31 // CHECK: {{ #0 0x.* in .*strncpy}} 32 // CHECK: {{ #1 0x.* in main .*strncpy-overflow.cpp:}}[[@LINE-3]] 33 // CHECK: {{0x.* is located 0 bytes to the right of 9-byte region}} 34 // CHECK: {{allocated by thread T0 here:}} 35 // CHECK: {{ #0 0x.* in .*malloc}} 36 // CHECK: {{ #1 0x.* in main .*strncpy-overflow.cpp:}}[[@LINE-8]] 37 return rval + sink_memory(9, short_buffer); 38 } 39