1 // SPDX-License-Identifier: GPL-2.0
3 #include <linux/errno.h>
5 #include <linux/pagemap.h>
6 #include <linux/xattr.h>
7 #include <linux/slab.h>
9 #include <linux/security.h>
10 #include <linux/uaccess.h>
13 security_get(const struct xattr_handler *handler, struct dentry *unused,
14 struct inode *inode, const char *name, void *buffer, size_t size)
16 if (IS_PRIVATE(inode))
19 return reiserfs_xattr_get(inode, xattr_full_name(handler, name),
24 security_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)
29 if (IS_PRIVATE(inode))
32 return reiserfs_xattr_set(inode,
33 xattr_full_name(handler, name),
37 static bool security_list(struct dentry *dentry)
39 return !IS_PRIVATE(d_inode(dentry));
43 reiserfs_initxattrs(struct inode *inode, const struct xattr *xattr_array,
46 struct reiserfs_security_handle *sec = fs_info;
48 sec->value = kmemdup(xattr_array->value, xattr_array->value_len,
53 sec->name = xattr_array->name;
54 sec->length = xattr_array->value_len;
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. */
61 int reiserfs_security_init(struct inode *dir, struct inode *inode,
62 const struct qstr *qstr,
63 struct reiserfs_security_handle *sec)
71 /* Don't add selinux attributes on xattrs - they'll never get used */
75 error = security_inode_init_security(inode, dir, qstr,
76 &reiserfs_initxattrs, sec);
84 if (sec->length && reiserfs_xattrs_initialized(inode->i_sb)) {
85 blocks = reiserfs_xattr_jcreate_nblocks(inode) +
86 reiserfs_xattr_nblocks(inode, sec->length);
87 /* We don't want to count the directories twice if we have
89 REISERFS_I(inode)->i_flags |= i_has_xattr_dir;
94 int reiserfs_security_write(struct reiserfs_transaction_handle *th,
96 struct reiserfs_security_handle *sec)
98 char xattr_name[XATTR_NAME_MAX + 1] = XATTR_SECURITY_PREFIX;
101 if (XATTR_SECURITY_PREFIX_LEN + strlen(sec->name) > XATTR_NAME_MAX)
104 strlcat(xattr_name, sec->name, sizeof(xattr_name));
106 error = reiserfs_xattr_set_handle(th, inode, xattr_name, sec->value,
107 sec->length, XATTR_CREATE);
108 if (error == -ENODATA || error == -EOPNOTSUPP)
114 void reiserfs_security_free(struct reiserfs_security_handle *sec)
121 const struct xattr_handler reiserfs_xattr_security_handler = {
122 .prefix = XATTR_SECURITY_PREFIX,
125 .list = security_list,