mirror of
https://github.com/LadybirdBrowser/ladybird.git
synced 2024-12-25 15:39:55 +00:00
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++
/*
|
|
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions are met:
|
|
*
|
|
* 1. Redistributions of source code must retain the above copyright notice, this
|
|
* list of conditions and the following disclaimer.
|
|
*
|
|
* 2. Redistributions in binary form must reproduce the above copyright notice,
|
|
* this list of conditions and the following disclaimer in the documentation
|
|
* and/or other materials provided with the distribution.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
|
|
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
|
|
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
|
|
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
|
|
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
|
|
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
|
|
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
*/
|
|
|
|
#pragma once
|
|
|
|
#include <AK/Types.h>
|
|
|
|
namespace AK {
|
|
class String;
|
|
}
|
|
|
|
namespace Syscall {
|
|
struct StringArgument;
|
|
}
|
|
|
|
AK::String copy_string_from_user(const char*, size_t);
|
|
|
|
extern "C" {
|
|
|
|
static_assert(sizeof(size_t) == 4);
|
|
|
|
void copy_to_user(void*, const void*, size_t);
|
|
void copy_from_user(void*, const void*, size_t);
|
|
void memset_user(void*, int, size_t);
|
|
|
|
void* memcpy(void*, const void*, size_t);
|
|
char* strcpy(char*, const char*);
|
|
char* strncpy(char*, const char*, size_t);
|
|
int strncmp(const char* s1, const char* s2, size_t n);
|
|
int strcmp(char const*, const char*);
|
|
size_t strlen(const char*);
|
|
size_t strnlen(const char*, size_t);
|
|
void* memset(void*, int, size_t);
|
|
char* strdup(const char*);
|
|
int memcmp(const void*, const void*, size_t);
|
|
char* strrchr(const char* str, int ch);
|
|
void* memmove(void* dest, const void* src, size_t n);
|
|
|
|
inline u16 ntohs(u16 w) { return (w & 0xff) << 8 | ((w >> 8) & 0xff); }
|
|
inline u16 htons(u16 w) { return (w & 0xff) << 8 | ((w >> 8) & 0xff); }
|
|
}
|
|
|
|
template<typename T>
|
|
inline void copy_from_user(T* dest, const T* src)
|
|
{
|
|
copy_from_user(dest, src, sizeof(T));
|
|
}
|
|
|
|
template<typename T>
|
|
inline void copy_to_user(T* dest, const T* src)
|
|
{
|
|
copy_to_user(dest, src, sizeof(T));
|
|
}
|