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