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f7b394e9a1
This will panic the kernel immediately if these functions are misused
so we can catch it and fix the misuse.
This patch fixes a couple of misuses:
- create_signal_trampolines() writes to a user-accessible page
above the 3GB address mark. We should really get rid of this
page but that's a whole other thing.
- CoW faults need to use copy_from_user rather than copy_to_user
since it's the *source* pointer that points to user memory.
- Inode faults need to use memcpy rather than copy_to_user since
we're copying a kernel stack buffer into a quickmapped page.
This should make the copy_to/from_user() functions slightly less useful
for exploitation. Before this, they were essentially just glorified
memcpy() with SMAP disabled. :^)
76 lines
2.6 KiB
C++
76 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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namespace AK {
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class String;
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}
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namespace Syscall {
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struct StringArgument;
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}
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AK::String copy_string_from_user(const char*, size_t);
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extern "C" {
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static_assert(sizeof(size_t) == 4);
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void copy_to_user(void*, const void*, size_t);
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void copy_from_user(void*, const void*, size_t);
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void memset_user(void*, int, size_t);
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void* memcpy(void*, const void*, size_t);
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char* strcpy(char*, const char*);
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char* strncpy(char*, const char*, size_t);
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int strncmp(const char* s1, const char* s2, size_t n);
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int strcmp(char const*, const char*);
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size_t strlen(const char*);
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size_t strnlen(const char*, size_t);
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void* memset(void*, int, size_t);
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char* strdup(const char*);
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int memcmp(const void*, const void*, size_t);
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char* strrchr(const char* str, int ch);
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void* memmove(void* dest, const void* src, size_t n);
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inline u16 ntohs(u16 w) { return (w & 0xff) << 8 | ((w >> 8) & 0xff); }
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inline u16 htons(u16 w) { return (w & 0xff) << 8 | ((w >> 8) & 0xff); }
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}
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template<typename T>
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inline void copy_from_user(T* dest, const T* src)
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{
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copy_from_user(dest, src, sizeof(T));
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}
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template<typename T>
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inline void copy_to_user(T* dest, const T* src)
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{
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copy_to_user(dest, src, sizeof(T));
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}
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