test/asan/TestCases/allocator_returns_null.cc

   1 // Test the behavior of malloc/calloc/realloc when the allocation size is huge.
   2 // By default (allocator_may_return_null=0) the process should crash.
   3 // With allocator_may_return_null=1 the allocator should return 0.
   4 //
   5 // RUN: %clangxx_asan -O0 %s -o %t
   6 // RUN: not %t malloc 2>&1 | FileCheck %s --check-prefix=CHECK-mCRASH
   7 // RUN: ASAN_OPTIONS=allocator_may_return_null=0 not %t malloc 2>&1 | FileCheck %s --check-prefix=CHECK-mCRASH
   8 // RUN: ASAN_OPTIONS=allocator_may_return_null=1     %t malloc 2>&1 | FileCheck %s --check-prefix=CHECK-mNULL
   9 // RUN: ASAN_OPTIONS=allocator_may_return_null=0 not %t calloc 2>&1 | FileCheck %s --check-prefix=CHECK-cCRASH
  10 // RUN: ASAN_OPTIONS=allocator_may_return_null=1     %t calloc 2>&1 | FileCheck %s --check-prefix=CHECK-cNULL
  11 // RUN: ASAN_OPTIONS=allocator_may_return_null=0 not %t calloc-overflow 2>&1 | FileCheck %s --check-prefix=CHECK-coCRASH
  12 // RUN: ASAN_OPTIONS=allocator_may_return_null=1     %t calloc-overflow 2>&1 | FileCheck %s --check-prefix=CHECK-coNULL
  13 // RUN: ASAN_OPTIONS=allocator_may_return_null=0 not %t realloc 2>&1 | FileCheck %s --check-prefix=CHECK-rCRASH
  14 // RUN: ASAN_OPTIONS=allocator_may_return_null=1     %t realloc 2>&1 | FileCheck %s --check-prefix=CHECK-rNULL
  15 // RUN: ASAN_OPTIONS=allocator_may_return_null=0 not %t realloc-after-malloc 2>&1 | FileCheck %s --check-prefix=CHECK-mrCRASH
  16 // RUN: ASAN_OPTIONS=allocator_may_return_null=1     %t realloc-after-malloc 2>&1 | FileCheck %s --check-prefix=CHECK-mrNULL
  17
  18 #include <limits.h>
  19 #include <stdlib.h>
  20 #include <string.h>
  21 #include <stdio.h>
  22 #include <assert.h>
  23 #include <limits>
  24 int main(int argc, char **argv) {
  25   volatile size_t size = std::numeric_limits<size_t>::max() - 10000;
  26   assert(argc == 2);
  27   char *x = 0;
  28   if (!strcmp(argv[1], "malloc")) {
  29     fprintf(stderr, "malloc:\n");
  30     x = (char*)malloc(size);
  31   }
  32   if (!strcmp(argv[1], "calloc")) {
  33     fprintf(stderr, "calloc:\n");
  34     x = (char*)calloc(size / 4, 4);
  35   }
  36
  37   if (!strcmp(argv[1], "calloc-overflow")) {
  38     fprintf(stderr, "calloc-overflow:\n");
  39     volatile size_t kMaxSizeT = std::numeric_limits<size_t>::max();
  40     size_t kArraySize = 4096;
  41     volatile size_t kArraySize2 = kMaxSizeT / kArraySize + 10;
  42     x = (char*)calloc(kArraySize, kArraySize2);
  43   }
  44
  45   if (!strcmp(argv[1], "realloc")) {
  46     fprintf(stderr, "realloc:\n");
  47     x = (char*)realloc(0, size);
  48   }
  49   if (!strcmp(argv[1], "realloc-after-malloc")) {
  50     fprintf(stderr, "realloc-after-malloc:\n");
  51     char *t = (char*)malloc(100);
  52     *t = 42;
  53     x = (char*)realloc(t, size);
  54     assert(*t == 42);
  55     free(t);
  56   }
  57   // The NULL pointer is printed differently on different systems, while (long)0
  58   // is always the same.
  59   fprintf(stderr, "x: %lx\n", (long)x);
  60   free(x);
  61   return x != 0;
  62 }
  63 // CHECK-mCRASH: malloc:
  64 // CHECK-mCRASH: AddressSanitizer's allocator is terminating the process
  65 // CHECK-cCRASH: calloc:
  66 // CHECK-cCRASH: AddressSanitizer's allocator is terminating the process
  67 // CHECK-coCRASH: calloc-overflow:
  68 // CHECK-coCRASH: AddressSanitizer's allocator is terminating the process
  69 // CHECK-rCRASH: realloc:
  70 // CHECK-rCRASH: AddressSanitizer's allocator is terminating the process
  71 // CHECK-mrCRASH: realloc-after-malloc:
  72 // CHECK-mrCRASH: AddressSanitizer's allocator is terminating the process
  73
  74 // CHECK-mNULL: malloc:
  75 // CHECK-mNULL: x: 0
  76 // CHECK-cNULL: calloc:
  77 // CHECK-cNULL: x: 0
  78 // CHECK-coNULL: calloc-overflow:
  79 // CHECK-coNULL: x: 0
  80 // CHECK-rNULL: realloc:
  81 // CHECK-rNULL: x: 0
  82 // CHECK-mrNULL: realloc-after-malloc:
  83 // CHECK-mrNULL: x: 0