compiler-rt/test/asan/TestCases/Darwin/segv_read_write.c

   1 // RUN: %clangxx_asan -std=c++11 -O0 %s -o %t
   2 // RUN: not %run %t       2>&1 | FileCheck %s --check-prefix=READ
   3 // RUN: not %run %t write 2>&1 | FileCheck %s --check-prefix=WRITE
   4 // REQUIRES: x86-target-arch
   5
   6 #include <sys/mman.h>
   7
   8 static volatile int sink;
   9 __attribute__((noinline)) void Read(int *ptr) { sink = *ptr; }
  10 __attribute__((noinline)) void Write(int *ptr) { *ptr = 0; }
  11 int main(int argc, char **argv) {
  12   void *volatile p =
  13       mmap(nullptr, 4096, PROT_READ, MAP_PRIVATE | MAP_ANON, -1, 0);
  14   munmap(p, 4096);
  15   if (argc == 1)
  16     Read((int *)p);
  17   else
  18     Write((int *)p);
  19 }
  20 // READ: AddressSanitizer: SEGV on unknown address
  21 // READ: The signal is caused by a READ memory access.
  22 // WRITE: AddressSanitizer: SEGV on unknown address
  23 // WRITE: The signal is caused by a WRITE memory access.