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// Copyright 2021 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "base/stack_canary_linux.h"
#include "base/compiler_specific.h"
#include "build/build_config.h"
#include "testing/gtest/include/gtest/gtest.h"
namespace base {
#if defined(LIBC_GLIBC) && \
(defined(ARCH_CPU_ARM_FAMILY) || defined(ARCH_CPU_X86_FAMILY))
namespace {
NOINLINE NOOPT void ResetCanaryAndReturn() {
// Create a buffer >=8 bytes to force the stack protector on this function,
// which should work as long as -fno-stack-protector isn't passed in the
// default options. We compile this file with -fstack-protector-all, but it
// may be overridden with -fstack-protector or -fstack-protector-strong.
[[maybe_unused]] char buffer[10];
ResetStackCanaryIfPossible();
}
} // namespace
// Essentially tests that ResetStackCanaryIfPossible() changes the
// actual reference canary that is checked in the function prologue.
TEST(StackCanary, ChangingStackCanaryCrashesOnReturn) {
ASSERT_DEATH(ResetCanaryAndReturn(), "stack smashing");
}
#if !defined(NDEBUG)
// Tests that the useful debug message works--specifically that on death, it
// prints out the bug URL with useful information.
TEST(StackCanary, ChangingStackCanaryPrintsDebugMessage) {
SetStackSmashingEmitsDebugMessage();
ASSERT_DEATH(ResetCanaryAndReturn(), "crbug\\.com/1206626");
}
#endif // !defined(NDEBUG)
#endif // defined(LIBC_GLIBC) && (defined(ARCH_CPU_ARM_FAMILY) ||
// defined(ARCH_CPU_X86_FAMILY))
} // namespace base
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