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8d51352b96
Since we scrub both kmalloc() and kfree() with predictable values, we can log a helpful message when hitting a crash that looks like it might be a dereference of such scrubbed data.
65 lines
2.6 KiB
C
65 lines
2.6 KiB
C
/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#pragma once
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#include <AK/Types.h>
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//#define KMALLOC_DEBUG_LARGE_ALLOCATIONS
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#define KMALLOC_SCRUB_BYTE 0xbb
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#define KFREE_SCRUB_BYTE 0xaa
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void kmalloc_init();
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[[gnu::malloc, gnu::returns_nonnull, gnu::alloc_size(1)]] void* kmalloc_impl(size_t);
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[[gnu::malloc, gnu::returns_nonnull, gnu::alloc_size(1)]] void* kmalloc_eternal(size_t);
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[[gnu::malloc, gnu::returns_nonnull, gnu::alloc_size(1)]] void* kmalloc_page_aligned(size_t);
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[[gnu::malloc, gnu::returns_nonnull, gnu::alloc_size(1)]] void* kmalloc_aligned(size_t, size_t alignment);
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void* krealloc(void*, size_t);
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void kfree(void*);
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void kfree_aligned(void*);
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extern volatile size_t sum_alloc;
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extern volatile size_t sum_free;
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extern volatile size_t kmalloc_sum_eternal;
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extern volatile size_t kmalloc_sum_page_aligned;
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extern u32 g_kmalloc_call_count;
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extern u32 g_kfree_call_count;
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extern bool g_dump_kmalloc_stacks;
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inline void* operator new(size_t, void* p) { return p; }
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inline void* operator new[](size_t, void* p) { return p; }
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[[gnu::always_inline]] inline void* kmalloc(size_t size)
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{
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#ifdef KMALLOC_DEBUG_LARGE_ALLOCATIONS
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// Any kernel allocation >= 1M is 99.9% a bug.
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if (size >= 1048576)
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asm volatile("cli;hlt");
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#endif
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return kmalloc_impl(size);
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}
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