1// Test needle overflow in strcasestr function
2// RUN: %clang_asan %s -o %t && %env_asan_opts=strict_string_checks=true not %run %t 2>&1 | FileCheck %s
3
4// Test intercept_strstr asan option
5// Disable other interceptors because strlen may be called inside strcasestr
6// RUN: %env_asan_opts=intercept_strstr=false:replace_str=false:intercept_strlen=false %run %t 2>&1
7
8// There's no interceptor for strcasestr on Windows
9// XFAIL: target={{.*windows-(msvc.*|gnu)}}
10
11#define _GNU_SOURCE
12#include <assert.h>
13#include <string.h>
14#include <sanitizer/asan_interface.h>
15
16int main(int argc, char **argv) {
17 char *r = 0;
18 char s1[] = "ab";
19 char s2[4] = "cba";
20 __asan_poison_memory_region (addr: (char *)&s2[2], size: 2);
21 r = strcasestr(haystack: s1, needle: s2);
22 assert(r == 0);
23 // CHECK:'s2'{{.*}} <== Memory access at offset {{[0-9]+}} partially overflows this variable
24 return 0;
25}
26

source code of compiler-rt/test/asan/TestCases/strcasestr-2.c