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
15TEST_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}
56

source code of compiler-rt/lib/gwp_asan/tests/never_allocated.cpp