35 lines · c
1// Test strchr for strict_string_checks=false does not look beyond necessary2// char.3// RUN: %clang_asan %s -o %t4// RUN: %env_asan_opts=strict_string_checks=false %run %t 2>&15// RUN: %env_asan_opts=strict_string_checks=true not %run %t 2>&1 | FileCheck %s6 7#include <assert.h>8#include <stdint.h>9#include <stdlib.h>10#include <string.h>11#include <sys/mman.h>12#include <unistd.h>13 14int main(int argc, char **argv) {15 size_t page_size = sysconf(_SC_PAGE_SIZE);16 size_t size = 2 * page_size;17 char *s = (char *)mmap(0, size, PROT_READ | PROT_WRITE,18 MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);19 assert(s);20 assert(((uintptr_t)s & (page_size - 1)) == 0);21 memset(s, 'o', size);22 s[size - 1] = 0;23 24 char *p = s + page_size - 1;25 *p = 'x';26 27 if (mprotect(p + 1, 1, PROT_NONE))28 return 1;29 char *r = strchr(s, 'x');30 // CHECK: AddressSanitizer: {{SEGV|BUS}} on unknown address31 assert(r == p);32 33 return 0;34}35