cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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xattr_security.c (1686B)

      1// SPDX-License-Identifier: GPL-2.0
      2/*
      3 * linux/fs/ext4/xattr_security.c
      4 * Handler for storing security labels as extended attributes.
      5 */
      6
      7#include <linux/string.h>
      8#include <linux/fs.h>
      9#include <linux/security.h>
     10#include <linux/slab.h>
     11#include "ext4_jbd2.h"
     12#include "ext4.h"
     13#include "xattr.h"
     14
     15static int
     16ext4_xattr_security_get(const struct xattr_handler *handler,
     17			struct dentry *unused, struct inode *inode,
     18			const char *name, void *buffer, size_t size)
     19{
     20	return ext4_xattr_get(inode, EXT4_XATTR_INDEX_SECURITY,
     21			      name, buffer, size);
     22}
     23
     24static int
     25ext4_xattr_security_set(const struct xattr_handler *handler,
     26			struct user_namespace *mnt_userns,
     27			struct dentry *unused, struct inode *inode,
     28			const char *name, const void *value,
     29			size_t size, int flags)
     30{
     31	return ext4_xattr_set(inode, EXT4_XATTR_INDEX_SECURITY,
     32			      name, value, size, flags);
     33}
     34
     35static int
     36ext4_initxattrs(struct inode *inode, const struct xattr *xattr_array,
     37		void *fs_info)
     38{
     39	const struct xattr *xattr;
     40	handle_t *handle = fs_info;
     41	int err = 0;
     42
     43	for (xattr = xattr_array; xattr->name != NULL; xattr++) {
     44		err = ext4_xattr_set_handle(handle, inode,
     45					    EXT4_XATTR_INDEX_SECURITY,
     46					    xattr->name, xattr->value,
     47					    xattr->value_len, XATTR_CREATE);
     48		if (err < 0)
     49			break;
     50	}
     51	return err;
     52}
     53
     54int
     55ext4_init_security(handle_t *handle, struct inode *inode, struct inode *dir,
     56		   const struct qstr *qstr)
     57{
     58	return security_inode_init_security(inode, dir, qstr,
     59					    &ext4_initxattrs, handle);
     60}
     61
     62const struct xattr_handler ext4_xattr_security_handler = {
     63	.prefix	= XATTR_SECURITY_PREFIX,
     64	.get	= ext4_xattr_security_get,
     65	.set	= ext4_xattr_security_set,
     66};