compiler-rt/test/asan/TestCases/strncmp_strict.c

   1 // Test strict_string_checks option in strncmp function
   2 // RUN: %clang_asan %s -o %t
   3
   4 // RUN: %env_asan_opts=strict_string_checks=false %run %t a 2>&1
   5 // RUN: %env_asan_opts=strict_string_checks=true %run %t a 2>&1
   6 // RUN: not %run %t b 2>&1 | FileCheck %s
   7 // RUN: not %run %t c 2>&1 | FileCheck %s
   8 // RUN: not %run %t d 2>&1 | FileCheck %s
   9 // RUN: not %run %t e 2>&1 | FileCheck %s
  10 // RUN: not %run %t f 2>&1 | FileCheck %s
  11 // RUN: not %run %t g 2>&1 | FileCheck %s
  12 // RUN: %env_asan_opts=strict_string_checks=false %run %t h 2>&1
  13 // RUN: %env_asan_opts=strict_string_checks=true not %run %t h 2>&1 | FileCheck %s
  14 // RUN: %env_asan_opts=strict_string_checks=false %run %t i 2>&1
  15 // RUN: %env_asan_opts=strict_string_checks=true not %run %t i 2>&1 | FileCheck %s
  16
  17 #include <assert.h>
  18 #include <stdlib.h>
  19 #include <stdio.h>
  20 #include <string.h>
  21 #include <ctype.h>
  22
  23 int main(int argc, char **argv) {
  24   assert(argc >= 2);
  25   enum { size = 100 };
  26   char fill = 'o';
  27   char s1[size];
  28   char s2[size];
  29   memset(s1, fill, size);
  30   memset(s2, fill, size);
  31
  32   switch (argv[1][0]) {
  33     case 'a':
  34       s1[size - 1] = 'z';
  35       s2[size - 1] = 'x';
  36       for (int i = 0; i <= size; ++i)
  37         assert((strncmp(s1, s2, i) == 0) == (i < size));
  38       s1[size - 1] = '\0';
  39       s2[size - 1] = '\0';
  40       assert(strncmp(s1, s2, 2*size) == 0);
  41       break;
  42     case 'b':
  43       return strncmp(s1-1, s2, 1);
  44     case 'c':
  45       return strncmp(s1, s2-1, 1);
  46     case 'd':
  47       return strncmp(s1+size, s2, 1);
  48     case 'e':
  49       return strncmp(s1, s2+size, 1);
  50     case 'f':
  51       return strncmp(s1+1, s2, size);
  52     case 'g':
  53       return strncmp(s1, s2+1, size);
  54     case 'h':
  55       s1[size - 1] = '\0';
  56       assert(strncmp(s1, s2, 2*size) != 0);
  57       break;
  58     case 'i':
  59       s2[size - 1] = '\0';
  60       assert(strncmp(s1, s2, 2*size) != 0);
  61       break;
  62     // CHECK: {{.*}}ERROR: AddressSanitizer: stack-buffer-{{ov|und}}erflow on address
  63   }
  64   return 0;
  65 }