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Kernel: Add initial basic support for KASAN

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This commit adds minimal support for compiler-instrumentation based
memory access sanitization.
Currently we only support detection of kmalloc redzone accesses, and
kmalloc use-after-free accesses.

Support for inline checks (for improved performance), and for stack
use-after-return and use-after-return detection is left for future PRs.
This commit is contained in:
Idan Horowitz 2023-12-29 02:36:39 +02:00 • committed by Andreas Kling
parent 7ad7ae7000
commit f7a1f28d7f
10 changed files with 538 additions and 63 deletions
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31
Kernel/FileSystem/SysFS/Subsystems/Kernel/Configuration/KASANDeadly.cpp Normal file
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/*
* Copyright (c) 2023, Idan Horowitz <idan.horowitz@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <Kernel/FileSystem/SysFS/Subsystems/Kernel/Configuration/KASANDeadly.h>
#include <Kernel/Security/AddressSanitizer.h>
namespace Kernel {
UNMAP_AFTER_INIT SysFSKASANDeadly::SysFSKASANDeadly(SysFSDirectory const& parent_directory)
: SysFSSystemBooleanVariable(parent_directory)
{
}
UNMAP_AFTER_INIT NonnullRefPtr<SysFSKASANDeadly> SysFSKASANDeadly::must_create(SysFSDirectory const& parent_directory)
{
return adopt_ref_if_nonnull(new (nothrow) SysFSKASANDeadly(parent_directory)).release_nonnull();
}
bool SysFSKASANDeadly::value() const
{
return AddressSanitizer::g_kasan_is_deadly;
}
void SysFSKASANDeadly::set_value(bool new_value)
{
AddressSanitizer::g_kasan_is_deadly = new_value;
}
}

28
Kernel/FileSystem/SysFS/Subsystems/Kernel/Configuration/KASANDeadly.h Normal file
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/*
* Copyright (c) 2023, Idan Horowitz <idan.horowitz@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include <AK/RefPtr.h>
#include <AK/Types.h>
#include <Kernel/FileSystem/SysFS/Subsystems/Kernel/Configuration/BooleanVariable.h>
#include <Kernel/Library/UserOrKernelBuffer.h>
namespace Kernel {
class SysFSKASANDeadly final : public SysFSSystemBooleanVariable {
public:
virtual StringView name() const override { return "kasan_is_deadly"sv; }
static NonnullRefPtr<SysFSKASANDeadly> must_create(SysFSDirectory const&);
private:
virtual bool value() const override;
virtual void set_value(bool new_value) override;
explicit SysFSKASANDeadly(SysFSDirectory const&);
};
}