85 lines
1.9 KiB
C
85 lines
1.9 KiB
C
/*
|
|
* PROCA fcntl implementation
|
|
*
|
|
* Copyright (C) 2018 Samsung Electronics, Inc.
|
|
* Hryhorii Tur, <hryhorii.tur@partner.samsung.com>
|
|
*
|
|
* This software is licensed under the terms of the GNU General Public
|
|
* License version 2, as published by the Free Software Foundation, and
|
|
* may be copied, distributed, and modified under those terms.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*/
|
|
|
|
#include <linux/proca.h>
|
|
#include <linux/task_integrity.h>
|
|
#include <linux/xattr.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/fs.h>
|
|
#include <linux/uaccess.h>
|
|
|
|
#define XATTR_PA_SUFFIX "pa"
|
|
#define XATTR_NAME_PA (XATTR_USER_PREFIX XATTR_PA_SUFFIX)
|
|
|
|
#include "proca_porting.h"
|
|
|
|
/**
|
|
* Length/Value structure
|
|
*/
|
|
struct lv {
|
|
uint16_t length;
|
|
uint8_t value[];
|
|
} __packed;
|
|
|
|
int proca_fcntl_setxattr(struct file *file, void __user *lv_xattr)
|
|
{
|
|
struct inode *inode = file_inode(file);
|
|
struct lv lv_hdr = {0};
|
|
int rc = -EPERM;
|
|
void *x = NULL;
|
|
|
|
if (unlikely(!file || !lv_xattr))
|
|
return -EINVAL;
|
|
|
|
if (unlikely(copy_from_user(&lv_hdr, lv_xattr, sizeof(lv_hdr))))
|
|
return -EFAULT;
|
|
|
|
if (unlikely(lv_hdr.length > PAGE_SIZE))
|
|
return -EINVAL;
|
|
|
|
x = kmalloc(lv_hdr.length, GFP_NOFS);
|
|
if (unlikely(!x))
|
|
return -ENOMEM;
|
|
|
|
if (unlikely(copy_from_user(x, lv_xattr + sizeof(lv_hdr),
|
|
lv_hdr.length))) {
|
|
rc = -EFAULT;
|
|
goto out;
|
|
}
|
|
|
|
if (file->f_op && file->f_op->flush)
|
|
if (file->f_op->flush(file, current->files)) {
|
|
rc = -EOPNOTSUPP;
|
|
goto out;
|
|
}
|
|
|
|
inode_lock(inode);
|
|
|
|
if (task_integrity_allow_sign(TASK_INTEGRITY(current))) {
|
|
rc = __vfs_setxattr_noperm(d_real_comp(file->f_path.dentry),
|
|
XATTR_NAME_PA,
|
|
x,
|
|
lv_hdr.length,
|
|
0);
|
|
}
|
|
inode_unlock(inode);
|
|
|
|
out:
|
|
kfree(x);
|
|
|
|
return rc;
|
|
}
|