// RUN: %clangxx_asan -O0 %s -o %t && not %run %t 2>&1 | FileCheck %s // RUN: %clangxx_asan -O1 %s -o %t && not %run %t 2>&1 | FileCheck %s // RUN: %clangxx_asan -O2 %s -o %t && not %run %t 2>&1 | FileCheck %s // RUN: %clangxx_asan -O3 %s -o %t && not %run %t 2>&1 | FileCheck %s // REQUIRES: compiler-rt-optimized // REQUIRES: stable-runtime #include #include // We need a way to prevent the optimize from eliminating the // strncpy below (which otherwises writes to dead storage). We // need the read to be out-of-line to prevent memory forwarding // from making the memory dead again. int sink_memory(int N, char *p) __attribute__((noinline)); int sink_memory(int N, char *p) { int sum = 0; for (int i = 0; i < N; i++) sum += p[i]; return sum; } int main(int argc, char **argv) { char *hello = (char*)malloc(6); strcpy(hello, "hello"); int rval = sink_memory(6, hello); char *short_buffer = (char*)malloc(9); strncpy(short_buffer, hello, 10); // BOOM // CHECK: {{WRITE of size 10 at 0x.* thread T0}} // CHECK: {{ #0 0x.* in .*strncpy}} // CHECK: {{ #1 0x.* in main .*strncpy-overflow.cpp:}}[[@LINE-3]] // CHECK: {{0x.* is located 0 bytes after 9-byte region}} // CHECK: {{allocated by thread T0 here:}} // CHECK: {{ #0 0x.* in .*malloc}} // CHECK: {{ #[1-3] 0x.* in main .*strncpy-overflow.cpp:}}[[@LINE-8]] return rval + sink_memory(9, short_buffer); }