1// SPDX-License-Identifier: GPL-2.0
  2#include "reiserfs.h"
  3#include <linux/errno.h>
  4#include <linux/fs.h>
  5#include <linux/pagemap.h>
  6#include <linux/xattr.h>
  7#include <linux/slab.h>
  8#include "xattr.h"
  9#include <linux/security.h>
 10#include <linux/uaccess.h>
 11
 12static int
 13security_get(const struct xattr_handler *handler, struct dentry *unused,
 14	     struct inode *inode, const char *name, void *buffer, size_t size)
 15{
 16	if (IS_PRIVATE(inode))
 17		return -EPERM;
 18
 19	return reiserfs_xattr_get(inode, xattr_full_name(handler, name),
 20				  buffer, size);
 21}
 22
 23static int
 24security_set(const struct xattr_handler *handler,
 25	     struct user_namespace *mnt_userns, struct dentry *unused,
 26	     struct inode *inode, const char *name, const void *buffer,
 27	     size_t size, int flags)
 28{
 29	if (IS_PRIVATE(inode))
 30		return -EPERM;
 31
 32	return reiserfs_xattr_set(inode,
 33				  xattr_full_name(handler, name),
 34				  buffer, size, flags);
 35}
 36
 37static bool security_list(struct dentry *dentry)
 38{
 39	return !IS_PRIVATE(d_inode(dentry));
 40}
 41
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 42/* Initializes the security context for a new inode and returns the number
 43 * of blocks needed for the transaction. If successful, reiserfs_security
 44 * must be released using reiserfs_security_free when the caller is done. */
 45int reiserfs_security_init(struct inode *dir, struct inode *inode,
 46			   const struct qstr *qstr,
 47			   struct reiserfs_security_handle *sec)
 48{
 49	int blocks = 0;
 50	int error;
 51
 52	sec->name = NULL;
 53	sec->value = NULL;
 
 54
 55	/* Don't add selinux attributes on xattrs - they'll never get used */
 56	if (IS_PRIVATE(dir))
 57		return 0;
 58
 59	error = security_old_inode_init_security(inode, dir, qstr, &sec->name,
 60						 &sec->value, &sec->length);
 61	if (error) {
 62		if (error == -EOPNOTSUPP)
 63			error = 0;
 64
 65		sec->name = NULL;
 66		sec->value = NULL;
 67		sec->length = 0;
 68		return error;
 69	}
 70
 71	if (sec->length && reiserfs_xattrs_initialized(inode->i_sb)) {
 72		blocks = reiserfs_xattr_jcreate_nblocks(inode) +
 73			 reiserfs_xattr_nblocks(inode, sec->length);
 74		/* We don't want to count the directories twice if we have
 75		 * a default ACL. */
 76		REISERFS_I(inode)->i_flags |= i_has_xattr_dir;
 77	}
 78	return blocks;
 79}
 80
 81int reiserfs_security_write(struct reiserfs_transaction_handle *th,
 82			    struct inode *inode,
 83			    struct reiserfs_security_handle *sec)
 84{
 
 85	int error;
 86	if (strlen(sec->name) < sizeof(XATTR_SECURITY_PREFIX))
 
 87		return -EINVAL;
 88
 89	error = reiserfs_xattr_set_handle(th, inode, sec->name, sec->value,
 
 
 90					  sec->length, XATTR_CREATE);
 91	if (error == -ENODATA || error == -EOPNOTSUPP)
 92		error = 0;
 93
 94	return error;
 95}
 96
 97void reiserfs_security_free(struct reiserfs_security_handle *sec)
 98{
 99	kfree(sec->value);
100	sec->name = NULL;
101	sec->value = NULL;
102}
103
104const struct xattr_handler reiserfs_xattr_security_handler = {
105	.prefix = XATTR_SECURITY_PREFIX,
106	.get = security_get,
107	.set = security_set,
108	.list = security_list,
109};

  1// SPDX-License-Identifier: GPL-2.0
  2#include "reiserfs.h"
  3#include <linux/errno.h>
  4#include <linux/fs.h>
  5#include <linux/pagemap.h>
  6#include <linux/xattr.h>
  7#include <linux/slab.h>
  8#include "xattr.h"
  9#include <linux/security.h>
 10#include <linux/uaccess.h>
 11
 12static int
 13security_get(const struct xattr_handler *handler, struct dentry *unused,
 14	     struct inode *inode, const char *name, void *buffer, size_t size)
 15{
 16	if (IS_PRIVATE(inode))
 17		return -EPERM;
 18
 19	return reiserfs_xattr_get(inode, xattr_full_name(handler, name),
 20				  buffer, size);
 21}
 22
 23static int
 24security_set(const struct xattr_handler *handler,
 25	     struct mnt_idmap *idmap, struct dentry *unused,
 26	     struct inode *inode, const char *name, const void *buffer,
 27	     size_t size, int flags)
 28{
 29	if (IS_PRIVATE(inode))
 30		return -EPERM;
 31
 32	return reiserfs_xattr_set(inode,
 33				  xattr_full_name(handler, name),
 34				  buffer, size, flags);
 35}
 36
 37static bool security_list(struct dentry *dentry)
 38{
 39	return !IS_PRIVATE(d_inode(dentry));
 40}
 41
 42static int
 43reiserfs_initxattrs(struct inode *inode, const struct xattr *xattr_array,
 44		    void *fs_info)
 45{
 46	struct reiserfs_security_handle *sec = fs_info;
 47
 48	sec->value = kmemdup(xattr_array->value, xattr_array->value_len,
 49			     GFP_KERNEL);
 50	if (!sec->value)
 51		return -ENOMEM;
 52
 53	sec->name = xattr_array->name;
 54	sec->length = xattr_array->value_len;
 55	return 0;
 56}
 57
 58/* Initializes the security context for a new inode and returns the number
 59 * of blocks needed for the transaction. If successful, reiserfs_security
 60 * must be released using reiserfs_security_free when the caller is done. */
 61int reiserfs_security_init(struct inode *dir, struct inode *inode,
 62			   const struct qstr *qstr,
 63			   struct reiserfs_security_handle *sec)
 64{
 65	int blocks = 0;
 66	int error;
 67
 68	sec->name = NULL;
 69	sec->value = NULL;
 70	sec->length = 0;
 71
 72	/* Don't add selinux attributes on xattrs - they'll never get used */
 73	if (IS_PRIVATE(dir))
 74		return 0;
 75
 76	error = security_inode_init_security(inode, dir, qstr,
 77					     &reiserfs_initxattrs, sec);
 78	if (error) {
 
 
 
 79		sec->name = NULL;
 80		sec->value = NULL;
 81		sec->length = 0;
 82		return error;
 83	}
 84
 85	if (sec->length && reiserfs_xattrs_initialized(inode->i_sb)) {
 86		blocks = reiserfs_xattr_jcreate_nblocks(inode) +
 87			 reiserfs_xattr_nblocks(inode, sec->length);
 88		/* We don't want to count the directories twice if we have
 89		 * a default ACL. */
 90		REISERFS_I(inode)->i_flags |= i_has_xattr_dir;
 91	}
 92	return blocks;
 93}
 94
 95int reiserfs_security_write(struct reiserfs_transaction_handle *th,
 96			    struct inode *inode,
 97			    struct reiserfs_security_handle *sec)
 98{
 99	char xattr_name[XATTR_NAME_MAX + 1] = XATTR_SECURITY_PREFIX;
100	int error;
101
102	if (XATTR_SECURITY_PREFIX_LEN + strlen(sec->name) > XATTR_NAME_MAX)
103		return -EINVAL;
104
105	strlcat(xattr_name, sec->name, sizeof(xattr_name));
106
107	error = reiserfs_xattr_set_handle(th, inode, xattr_name, sec->value,
108					  sec->length, XATTR_CREATE);
109	if (error == -ENODATA || error == -EOPNOTSUPP)
110		error = 0;
111
112	return error;
113}
114
115void reiserfs_security_free(struct reiserfs_security_handle *sec)
116{
117	kfree(sec->value);
118	sec->name = NULL;
119	sec->value = NULL;
120}
121
122const struct xattr_handler reiserfs_xattr_security_handler = {
123	.prefix = XATTR_SECURITY_PREFIX,
124	.get = security_get,
125	.set = security_set,
126	.list = security_list,
127};