mirror of
https://github.com/LadybirdBrowser/ladybird.git
synced 2024-11-11 01:06:01 +03:00
e87eac9273
This achieves two things: - Programs can now intentionally perform arbitrary syscalls by calling syscall(). This allows us to work on things like syscall fuzzing. - It restricts the ability of userspace to make syscalls to a single 4KB page of code. In order to call the kernel directly, an attacker must now locate this page and call through it.
96 lines
2.9 KiB
C++
96 lines
2.9 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.
|
|
*/
|
|
|
|
#include <errno.h>
|
|
#include <fcntl.h>
|
|
#include <stdarg.h>
|
|
#include <string.h>
|
|
#include <syscall.h>
|
|
|
|
extern "C" {
|
|
|
|
int fcntl(int fd, int cmd, ...)
|
|
{
|
|
va_list ap;
|
|
va_start(ap, cmd);
|
|
u32 extra_arg = va_arg(ap, u32);
|
|
int rc = syscall(SC_fcntl, fd, cmd, extra_arg);
|
|
va_end(ap);
|
|
__RETURN_WITH_ERRNO(rc, rc, -1);
|
|
}
|
|
|
|
int watch_file(const char* path, size_t path_length)
|
|
{
|
|
int rc = syscall(SC_watch_file, path, path_length);
|
|
__RETURN_WITH_ERRNO(rc, rc, -1);
|
|
}
|
|
|
|
int creat(const char* path, mode_t mode)
|
|
{
|
|
return open(path, O_CREAT | O_WRONLY | O_TRUNC, mode);
|
|
}
|
|
|
|
int open(const char* path, int options, ...)
|
|
{
|
|
if (!path) {
|
|
errno = EFAULT;
|
|
return -1;
|
|
}
|
|
auto path_length = strlen(path);
|
|
if (path_length > INT32_MAX) {
|
|
errno = EINVAL;
|
|
return -1;
|
|
}
|
|
va_list ap;
|
|
va_start(ap, options);
|
|
auto mode = (mode_t)va_arg(ap, unsigned);
|
|
va_end(ap);
|
|
Syscall::SC_open_params params { AT_FDCWD, { path, path_length }, options, mode };
|
|
int rc = syscall(SC_open, ¶ms);
|
|
__RETURN_WITH_ERRNO(rc, rc, -1);
|
|
}
|
|
|
|
int openat(int dirfd, const char* path, int options, ...)
|
|
{
|
|
if (!path) {
|
|
errno = EFAULT;
|
|
return -1;
|
|
}
|
|
auto path_length = strlen(path);
|
|
if (path_length > INT32_MAX) {
|
|
errno = EINVAL;
|
|
return -1;
|
|
}
|
|
va_list ap;
|
|
va_start(ap, options);
|
|
auto mode = (mode_t)va_arg(ap, unsigned);
|
|
va_end(ap);
|
|
Syscall::SC_open_params params { dirfd, { path, path_length }, options, mode };
|
|
int rc = syscall(SC_open, ¶ms);
|
|
__RETURN_WITH_ERRNO(rc, rc, -1);
|
|
}
|
|
}
|