compiler-rt/lib/gwp_asan/tests/never_allocated.cpp

   1 //===-- never_allocated.cpp -------------------------------------*- C++ -*-===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8
   9 #include <string>
  10
  11 #include "gwp_asan/common.h"
  12 #include "gwp_asan/crash_handler.h"
  13 #include "gwp_asan/tests/harness.h"
  14
  15 TEST_P(BacktraceGuardedPoolAllocatorDeathTest, NeverAllocated) {
  16   SCOPED_TRACE("");
  17   void *Ptr = GPA.allocate(0x1000);
  18   GPA.deallocate(Ptr);
  19
  20   std::string DeathNeedle =
  21       "GWP-ASan cannot provide any more information about this error";
  22
  23   // Trigger a guard page in a completely different slot that's never allocated.
  24   // Previously, there was a bug that this would result in nullptr-dereference
  25   // in the posix crash handler.
  26   char *volatile NeverAllocatedPtr = static_cast<char *>(Ptr) + 0x3000;
  27   if (!Recoverable) {
  28     EXPECT_DEATH(*NeverAllocatedPtr = 0, DeathNeedle);
  29     return;
  30   }
  31
  32   *NeverAllocatedPtr = 0;
  33   CheckOnlyOneGwpAsanCrash(GetOutputBuffer());
  34   ASSERT_NE(std::string::npos, GetOutputBuffer().find(DeathNeedle));
  35
  36   // Check that subsequent invalid touches of the pool don't print a report.
  37   GetOutputBuffer().clear();
  38   for (size_t i = 0; i < 100; ++i) {
  39     *NeverAllocatedPtr = 0;
  40     *(NeverAllocatedPtr + 0x2000) = 0;
  41     *(NeverAllocatedPtr + 0x3000) = 0;
  42     ASSERT_TRUE(GetOutputBuffer().empty());
  43   }
  44
  45   // Check that reports on the other slots still report a double-free, but only
  46   // once.
  47   GetOutputBuffer().clear();
  48   GPA.deallocate(Ptr);
  49   ASSERT_NE(std::string::npos, GetOutputBuffer().find("Double Free"));
  50   GetOutputBuffer().clear();
  51   for (size_t i = 0; i < 100; ++i) {
  52     DeallocateMemory(GPA, Ptr);
  53     ASSERT_TRUE(GetOutputBuffer().empty());
  54   }
  55 }