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//===-- never_allocated.cpp -------------------------------------*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include <string>
#include "gwp_asan/common.h"
#include "gwp_asan/crash_handler.h"
#include "gwp_asan/tests/harness.h"
#include <unistd.h>
TEST_P(BacktraceGuardedPoolAllocatorDeathTest, NeverAllocated) {
size_t PageSize = sysconf(_SC_PAGESIZE);
SCOPED_TRACE("");
void *Ptr = GPA.allocate(PageSize);
GPA.deallocate(Ptr);
std::string DeathNeedle =
"GWP-ASan cannot provide any more information about this error";
// Trigger a guard page in a completely different slot that's never allocated.
// Previously, there was a bug that this would result in nullptr-dereference
// in the posix crash handler.
char *volatile NeverAllocatedPtr = static_cast<char *>(Ptr) + 3 * PageSize;
if (!Recoverable) {
EXPECT_DEATH(*NeverAllocatedPtr = 0, DeathNeedle);
return;
}
*NeverAllocatedPtr = 0;
CheckOnlyOneGwpAsanCrash(GetOutputBuffer());
ASSERT_NE(std::string::npos, GetOutputBuffer().find(DeathNeedle));
// Check that subsequent invalid touches of the pool don't print a report.
GetOutputBuffer().clear();
for (size_t i = 0; i < 100; ++i) {
*NeverAllocatedPtr = 0;
*(NeverAllocatedPtr + 2 * PageSize) = 0;
*(NeverAllocatedPtr + 3 * PageSize) = 0;
ASSERT_TRUE(GetOutputBuffer().empty());
}
// Check that reports on the other slots still report a double-free, but only
// once.
GetOutputBuffer().clear();
GPA.deallocate(Ptr);
ASSERT_NE(std::string::npos, GetOutputBuffer().find("Double Free"));
GetOutputBuffer().clear();
for (size_t i = 0; i < 100; ++i) {
DeallocateMemory(GPA, Ptr);
ASSERT_TRUE(GetOutputBuffer().empty());
}
}
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