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 (2057B)

      1// SPDX-License-Identifier: GPL-2.0
      2/*
      3 * linux/fs/hfsplus/xattr_trusted.c
      4 *
      5 * Vyacheslav Dubeyko <slava@dubeyko.com>
      6 *
      7 * Handler for storing security labels as extended attributes.
      8 */
      9
     10#include <linux/security.h>
     11#include <linux/nls.h>
     12
     13#include "hfsplus_fs.h"
     14#include "xattr.h"
     15
     16static int hfsplus_security_getxattr(const struct xattr_handler *handler,
     17				     struct dentry *unused, struct inode *inode,
     18				     const char *name, void *buffer, size_t size)
     19{
     20	return hfsplus_getxattr(inode, name, buffer, size,
     21				XATTR_SECURITY_PREFIX,
     22				XATTR_SECURITY_PREFIX_LEN);
     23}
     24
     25static int hfsplus_security_setxattr(const struct xattr_handler *handler,
     26				     struct user_namespace *mnt_userns,
     27				     struct dentry *unused, struct inode *inode,
     28				     const char *name, const void *buffer,
     29				     size_t size, int flags)
     30{
     31	return hfsplus_setxattr(inode, name, buffer, size, flags,
     32				XATTR_SECURITY_PREFIX,
     33				XATTR_SECURITY_PREFIX_LEN);
     34}
     35
     36static int hfsplus_initxattrs(struct inode *inode,
     37				const struct xattr *xattr_array,
     38				void *fs_info)
     39{
     40	const struct xattr *xattr;
     41	char *xattr_name;
     42	int err = 0;
     43
     44	xattr_name = kmalloc(NLS_MAX_CHARSET_SIZE * HFSPLUS_ATTR_MAX_STRLEN + 1,
     45		GFP_KERNEL);
     46	if (!xattr_name)
     47		return -ENOMEM;
     48	for (xattr = xattr_array; xattr->name != NULL; xattr++) {
     49
     50		if (!strcmp(xattr->name, ""))
     51			continue;
     52
     53		strcpy(xattr_name, XATTR_SECURITY_PREFIX);
     54		strcpy(xattr_name +
     55			XATTR_SECURITY_PREFIX_LEN, xattr->name);
     56		memset(xattr_name +
     57			XATTR_SECURITY_PREFIX_LEN + strlen(xattr->name), 0, 1);
     58
     59		err = __hfsplus_setxattr(inode, xattr_name,
     60					xattr->value, xattr->value_len, 0);
     61		if (err)
     62			break;
     63	}
     64	kfree(xattr_name);
     65	return err;
     66}
     67
     68int hfsplus_init_security(struct inode *inode, struct inode *dir,
     69				const struct qstr *qstr)
     70{
     71	return security_inode_init_security(inode, dir, qstr,
     72					&hfsplus_initxattrs, NULL);
     73}
     74
     75const struct xattr_handler hfsplus_xattr_security_handler = {
     76	.prefix	= XATTR_SECURITY_PREFIX,
     77	.get	= hfsplus_security_getxattr,
     78	.set	= hfsplus_security_setxattr,
     79};