| // Test strchr for strict_string_checks=false does not look beyond necessary |
| // char. |
| // RUN: %clang_asan %s -o %t |
| // RUN: %env_asan_opts=strict_string_checks=false %run %t 2>&1 |
| // RUN: %env_asan_opts=strict_string_checks=true not %run %t 2>&1 | FileCheck %s |
| |
| #include <assert.h> |
| #include <stdint.h> |
| #include <stdlib.h> |
| #include <string.h> |
| #include <sys/mman.h> |
| #include <unistd.h> |
| |
| int main(int argc, char **argv) { |
| size_t page_size = sysconf(_SC_PAGE_SIZE); |
| size_t size = 2 * page_size; |
| char *s = (char *)mmap(0, size, PROT_READ | PROT_WRITE, |
| MAP_PRIVATE | MAP_ANONYMOUS, -1, 0); |
| assert(s); |
| assert(((uintptr_t)s & (page_size - 1)) == 0); |
| memset(s, 'o', size); |
| s[size - 1] = 0; |
| |
| char *p = s + page_size - 1; |
| *p = 'x'; |
| |
| if (mprotect(p + 1, 1, PROT_NONE)) |
| return 1; |
| char *r = strchr(s, 'x'); |
| // CHECK: AddressSanitizer: {{SEGV|BUS}} on unknown address |
| assert(r == p); |
| |
| return 0; |
| } |