| 1 | //===-- never_allocated.cpp -------------------------------------*- C++ -*-===// |
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| 2 | // |
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| 3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
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| 4 | // See https://llvm.org/LICENSE.txt for license information. |
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| 5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
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| 6 | // |
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| 7 | //===----------------------------------------------------------------------===// |
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| 8 | |
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| 9 | #include <string> |
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| 10 | |
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| 11 | #include "gwp_asan/common.h" |
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| 12 | #include "gwp_asan/crash_handler.h" |
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| 13 | #include "gwp_asan/tests/harness.h" |
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| 14 | |
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| 15 | TEST_P(BacktraceGuardedPoolAllocatorDeathTest, NeverAllocated) { |
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| 16 | size_t PageSize = sysconf(_SC_PAGESIZE); |
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| 17 | |
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| 18 | SCOPED_TRACE("" ); |
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| 19 | void *Ptr = GPA.allocate(PageSize); |
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| 20 | GPA.deallocate(Ptr); |
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| 21 | |
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| 22 | std::string DeathNeedle = |
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| 23 | "GWP-ASan cannot provide any more information about this error" ; |
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| 24 | |
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| 25 | // Trigger a guard page in a completely different slot that's never allocated. |
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| 26 | // Previously, there was a bug that this would result in nullptr-dereference |
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| 27 | // in the posix crash handler. |
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| 28 | char *volatile NeverAllocatedPtr = static_cast<char *>(Ptr) + 3 * PageSize; |
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| 29 | if (!Recoverable) { |
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| 30 | EXPECT_DEATH(*NeverAllocatedPtr = 0, DeathNeedle); |
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| 31 | return; |
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| 32 | } |
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| 33 | |
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| 34 | *NeverAllocatedPtr = 0; |
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| 35 | CheckOnlyOneGwpAsanCrash(GetOutputBuffer()); |
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| 36 | ASSERT_NE(std::string::npos, GetOutputBuffer().find(DeathNeedle)); |
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| 37 | |
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| 38 | // Check that subsequent invalid touches of the pool don't print a report. |
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| 39 | GetOutputBuffer().clear(); |
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| 40 | for (size_t i = 0; i < 100; ++i) { |
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| 41 | *NeverAllocatedPtr = 0; |
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| 42 | *(NeverAllocatedPtr + 2 * PageSize) = 0; |
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| 43 | *(NeverAllocatedPtr + 3 * PageSize) = 0; |
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| 44 | ASSERT_TRUE(GetOutputBuffer().empty()); |
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| 45 | } |
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| 46 | |
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| 47 | // Check that reports on the other slots still report a double-free, but only |
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| 48 | // once. |
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| 49 | GetOutputBuffer().clear(); |
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| 50 | GPA.deallocate(Ptr); |
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| 51 | ASSERT_NE(std::string::npos, GetOutputBuffer().find("Double Free" )); |
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| 52 | GetOutputBuffer().clear(); |
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| 53 | for (size_t i = 0; i < 100; ++i) { |
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| 54 | DeallocateMemory(GPA, Ptr); |
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| 55 | ASSERT_TRUE(GetOutputBuffer().empty()); |
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| 56 | } |
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| 57 | } |
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| 58 | |
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