compiler-rt/test/sanitizer_common/TestCases/Linux/pvalloc-overflow.cpp

   1 // RUN: %clangxx %collect_stack_traces -O0 %s -o %t
   2 // RUN: %env_tool_opts=allocator_may_return_null=0 not %run %t m1 2>&1 | FileCheck %s
   3 // RUN: %env_tool_opts=allocator_may_return_null=1     %run %t m1 2>&1 | FileCheck %s --check-prefix=CHECK-NULL
   4 // RUN: %env_tool_opts=allocator_may_return_null=0 not %run %t psm1 2>&1 | FileCheck %s
   5 // RUN: %env_tool_opts=allocator_may_return_null=1     %run %t psm1 2>&1 | FileCheck %s --check-prefix=CHECK-NULL
   6
   7 // REQUIRES: stable-runtime
   8
   9 // UNSUPPORTED: android, target={{.*(freebsd|netbsd).*}}, ubsan
  10
  11 // Checks that pvalloc overflows are caught. If the allocator is allowed to
  12 // return null, the errno should be set to ENOMEM.
  13
  14 #include <assert.h>
  15 #include <errno.h>
  16 #include <malloc.h>
  17 #include <stdio.h>
  18 #include <stdint.h>
  19 #include <string.h>
  20 #include <unistd.h>
  21
  22 int main(int argc, char *argv[]) {
  23   assert(argc == 2);
  24   const char *action = argv[1];
  25
  26   const size_t page_size = sysconf(_SC_PAGESIZE);
  27
  28   void *p = nullptr;
  29   if (!strcmp(action, "m1")) {
  30     p = pvalloc((uintptr_t)-1);
  31   } else if (!strcmp(action, "psm1")) {
  32     p = pvalloc((uintptr_t)-(page_size - 1));
  33   } else {
  34     assert(0);
  35   }
  36   // CHECK: {{ERROR: .*Sanitizer: pvalloc parameters overflow: size .* rounded up to system page size .* cannot be represented in type size_t}}
  37   // CHECK: {{#0 .*pvalloc}}
  38   // CHECK: {{#[12] .*main .*pvalloc-overflow.cpp:}}
  39   // CHECK: {{SUMMARY: .*Sanitizer: pvalloc-overflow}}
  40
  41   // The NULL pointer is printed differently on different systems, while (long)0
  42   // is always the same.
  43   fprintf(stderr, "errno: %d, p: %lx\n", errno, (long)p);
  44   // CHECK-NULL: errno: 12, p: 0
  45
  46   return 0;
  47 }