compiler-rt/test/asan/TestCases/Linux/cuda_test.cpp

   1 // Emulate the behavior of the NVIDIA CUDA driver
   2 // that mmaps memory inside the asan's shadow gap.
   3 //
   4 // REQUIRES: x86_64-target-arch, shadow-scale-3
   5 //
   6 // RUN: %clangxx_asan %s -o %t
   7 // RUN: not %env_asan_opts=protect_shadow_gap=1 %t 2>&1 | FileCheck %s  --check-prefix=CHECK-PROTECT1
   8 // RUN: not                                     %t 2>&1 | FileCheck %s  --check-prefix=CHECK-PROTECT1
   9 // RUN: not %env_asan_opts=protect_shadow_gap=0 %t 2>&1 | FileCheck %s  --check-prefix=CHECK-PROTECT0
  10 #include <assert.h>
  11 #include <unistd.h>
  12 #include <sys/mman.h>
  13 #include <stdint.h>
  14
  15 #include "sanitizer/asan_interface.h"
  16
  17 int main(void) {
  18   uintptr_t Base = 0x200000000;
  19   uintptr_t Size = 0x1100000000;
  20   void *addr =
  21       mmap((void *)Base, Size, PROT_READ | PROT_WRITE,
  22            MAP_NORESERVE | MAP_PRIVATE | MAP_ANONYMOUS | MAP_FIXED, 0, 0);
  23   assert(addr == (void*)Base);
  24   // Make sure we can access memory in shadow gap.
  25   // W/o protect_shadow_gap=0 we should fail here.
  26   for (uintptr_t Addr = Base; Addr < Base + Size; Addr += Size / 100)
  27     *(char*)Addr = 1;
  28   // CHECK-PROTECT1: AddressSanitizer: SEGV on unknown address 0x0000bfff8000
  29
  30   // Poison a part of gap's shadow:
  31   __asan_poison_memory_region((void*)Base, 4096);
  32   // Now we should fail with use-after-poison.
  33   *(char*)(Base + 1234) = 1;
  34   // CHECK-PROTECT0: AddressSanitizer: use-after-poison on address 0x0002000004d2
  35 }