mirror of
https://github.com/LadybirdBrowser/ladybird.git
synced 2025-01-24 10:12:25 -05:00
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.
99 lines
2.9 KiB
C++
99 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 <assert.h>
|
|
#include <errno.h>
|
|
#include <stdio.h>
|
|
#include <string.h>
|
|
#include <sys/stat.h>
|
|
#include <syscall.h>
|
|
#include <unistd.h>
|
|
|
|
extern "C" {
|
|
|
|
mode_t umask(mode_t mask)
|
|
{
|
|
return syscall(SC_umask, mask);
|
|
}
|
|
|
|
int mkdir(const char* pathname, mode_t mode)
|
|
{
|
|
if (!pathname) {
|
|
errno = EFAULT;
|
|
return -1;
|
|
}
|
|
int rc = syscall(SC_mkdir, pathname, strlen(pathname), mode);
|
|
__RETURN_WITH_ERRNO(rc, rc, -1);
|
|
}
|
|
|
|
int chmod(const char* pathname, mode_t mode)
|
|
{
|
|
if (!pathname) {
|
|
errno = EFAULT;
|
|
return -1;
|
|
}
|
|
int rc = syscall(SC_chmod, pathname, strlen(pathname), mode);
|
|
__RETURN_WITH_ERRNO(rc, rc, -1);
|
|
}
|
|
|
|
int fchmod(int fd, mode_t mode)
|
|
{
|
|
int rc = syscall(SC_fchmod, fd, mode);
|
|
__RETURN_WITH_ERRNO(rc, rc, -1);
|
|
}
|
|
|
|
int mkfifo(const char* pathname, mode_t mode)
|
|
{
|
|
return mknod(pathname, mode | S_IFIFO, 0);
|
|
}
|
|
|
|
static int do_stat(const char* path, struct stat* statbuf, bool follow_symlinks)
|
|
{
|
|
if (!path) {
|
|
errno = EFAULT;
|
|
return -1;
|
|
}
|
|
Syscall::SC_stat_params params { { path, strlen(path) }, statbuf, follow_symlinks };
|
|
int rc = syscall(SC_stat, ¶ms);
|
|
__RETURN_WITH_ERRNO(rc, rc, -1);
|
|
}
|
|
|
|
int lstat(const char* path, struct stat* statbuf)
|
|
{
|
|
return do_stat(path, statbuf, false);
|
|
}
|
|
|
|
int stat(const char* path, struct stat* statbuf)
|
|
{
|
|
return do_stat(path, statbuf, true);
|
|
}
|
|
|
|
int fstat(int fd, struct stat* statbuf)
|
|
{
|
|
int rc = syscall(SC_fstat, fd, statbuf);
|
|
__RETURN_WITH_ERRNO(rc, rc, -1);
|
|
}
|
|
}
|