1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0
2*4882a593Smuzhiyun #include "reiserfs.h"
3*4882a593Smuzhiyun #include <linux/errno.h>
4*4882a593Smuzhiyun #include <linux/fs.h>
5*4882a593Smuzhiyun #include <linux/pagemap.h>
6*4882a593Smuzhiyun #include <linux/xattr.h>
7*4882a593Smuzhiyun #include <linux/slab.h>
8*4882a593Smuzhiyun #include "xattr.h"
9*4882a593Smuzhiyun #include <linux/security.h>
10*4882a593Smuzhiyun #include <linux/uaccess.h>
11*4882a593Smuzhiyun
12*4882a593Smuzhiyun static int
security_get(const struct xattr_handler * handler,struct dentry * unused,struct inode * inode,const char * name,void * buffer,size_t size,int flags)13*4882a593Smuzhiyun security_get(const struct xattr_handler *handler, struct dentry *unused,
14*4882a593Smuzhiyun struct inode *inode, const char *name, void *buffer, size_t size,
15*4882a593Smuzhiyun int flags)
16*4882a593Smuzhiyun {
17*4882a593Smuzhiyun if (IS_PRIVATE(inode))
18*4882a593Smuzhiyun return -EPERM;
19*4882a593Smuzhiyun
20*4882a593Smuzhiyun return reiserfs_xattr_get(inode, xattr_full_name(handler, name),
21*4882a593Smuzhiyun buffer, size);
22*4882a593Smuzhiyun }
23*4882a593Smuzhiyun
24*4882a593Smuzhiyun static int
security_set(const struct xattr_handler * handler,struct dentry * unused,struct inode * inode,const char * name,const void * buffer,size_t size,int flags)25*4882a593Smuzhiyun security_set(const struct xattr_handler *handler, struct dentry *unused,
26*4882a593Smuzhiyun struct inode *inode, const char *name, const void *buffer,
27*4882a593Smuzhiyun size_t size, int flags)
28*4882a593Smuzhiyun {
29*4882a593Smuzhiyun if (IS_PRIVATE(inode))
30*4882a593Smuzhiyun return -EPERM;
31*4882a593Smuzhiyun
32*4882a593Smuzhiyun return reiserfs_xattr_set(inode,
33*4882a593Smuzhiyun xattr_full_name(handler, name),
34*4882a593Smuzhiyun buffer, size, flags);
35*4882a593Smuzhiyun }
36*4882a593Smuzhiyun
security_list(struct dentry * dentry)37*4882a593Smuzhiyun static bool security_list(struct dentry *dentry)
38*4882a593Smuzhiyun {
39*4882a593Smuzhiyun return !IS_PRIVATE(d_inode(dentry));
40*4882a593Smuzhiyun }
41*4882a593Smuzhiyun
42*4882a593Smuzhiyun /* Initializes the security context for a new inode and returns the number
43*4882a593Smuzhiyun * of blocks needed for the transaction. If successful, reiserfs_security
44*4882a593Smuzhiyun * must be released using reiserfs_security_free when the caller is done. */
reiserfs_security_init(struct inode * dir,struct inode * inode,const struct qstr * qstr,struct reiserfs_security_handle * sec)45*4882a593Smuzhiyun int reiserfs_security_init(struct inode *dir, struct inode *inode,
46*4882a593Smuzhiyun const struct qstr *qstr,
47*4882a593Smuzhiyun struct reiserfs_security_handle *sec)
48*4882a593Smuzhiyun {
49*4882a593Smuzhiyun int blocks = 0;
50*4882a593Smuzhiyun int error;
51*4882a593Smuzhiyun
52*4882a593Smuzhiyun sec->name = NULL;
53*4882a593Smuzhiyun
54*4882a593Smuzhiyun /* Don't add selinux attributes on xattrs - they'll never get used */
55*4882a593Smuzhiyun if (IS_PRIVATE(dir))
56*4882a593Smuzhiyun return 0;
57*4882a593Smuzhiyun
58*4882a593Smuzhiyun error = security_old_inode_init_security(inode, dir, qstr, &sec->name,
59*4882a593Smuzhiyun &sec->value, &sec->length);
60*4882a593Smuzhiyun if (error) {
61*4882a593Smuzhiyun if (error == -EOPNOTSUPP)
62*4882a593Smuzhiyun error = 0;
63*4882a593Smuzhiyun
64*4882a593Smuzhiyun sec->name = NULL;
65*4882a593Smuzhiyun sec->value = NULL;
66*4882a593Smuzhiyun sec->length = 0;
67*4882a593Smuzhiyun return error;
68*4882a593Smuzhiyun }
69*4882a593Smuzhiyun
70*4882a593Smuzhiyun if (sec->length && reiserfs_xattrs_initialized(inode->i_sb)) {
71*4882a593Smuzhiyun blocks = reiserfs_xattr_jcreate_nblocks(inode) +
72*4882a593Smuzhiyun reiserfs_xattr_nblocks(inode, sec->length);
73*4882a593Smuzhiyun /* We don't want to count the directories twice if we have
74*4882a593Smuzhiyun * a default ACL. */
75*4882a593Smuzhiyun REISERFS_I(inode)->i_flags |= i_has_xattr_dir;
76*4882a593Smuzhiyun }
77*4882a593Smuzhiyun return blocks;
78*4882a593Smuzhiyun }
79*4882a593Smuzhiyun
reiserfs_security_write(struct reiserfs_transaction_handle * th,struct inode * inode,struct reiserfs_security_handle * sec)80*4882a593Smuzhiyun int reiserfs_security_write(struct reiserfs_transaction_handle *th,
81*4882a593Smuzhiyun struct inode *inode,
82*4882a593Smuzhiyun struct reiserfs_security_handle *sec)
83*4882a593Smuzhiyun {
84*4882a593Smuzhiyun int error;
85*4882a593Smuzhiyun if (strlen(sec->name) < sizeof(XATTR_SECURITY_PREFIX))
86*4882a593Smuzhiyun return -EINVAL;
87*4882a593Smuzhiyun
88*4882a593Smuzhiyun error = reiserfs_xattr_set_handle(th, inode, sec->name, sec->value,
89*4882a593Smuzhiyun sec->length, XATTR_CREATE);
90*4882a593Smuzhiyun if (error == -ENODATA || error == -EOPNOTSUPP)
91*4882a593Smuzhiyun error = 0;
92*4882a593Smuzhiyun
93*4882a593Smuzhiyun return error;
94*4882a593Smuzhiyun }
95*4882a593Smuzhiyun
reiserfs_security_free(struct reiserfs_security_handle * sec)96*4882a593Smuzhiyun void reiserfs_security_free(struct reiserfs_security_handle *sec)
97*4882a593Smuzhiyun {
98*4882a593Smuzhiyun kfree(sec->name);
99*4882a593Smuzhiyun kfree(sec->value);
100*4882a593Smuzhiyun sec->name = NULL;
101*4882a593Smuzhiyun sec->value = NULL;
102*4882a593Smuzhiyun }
103*4882a593Smuzhiyun
104*4882a593Smuzhiyun const struct xattr_handler reiserfs_xattr_security_handler = {
105*4882a593Smuzhiyun .prefix = XATTR_SECURITY_PREFIX,
106*4882a593Smuzhiyun .get = security_get,
107*4882a593Smuzhiyun .set = security_set,
108*4882a593Smuzhiyun .list = security_list,
109*4882a593Smuzhiyun };
110