1 // SPDX-License-Identifier: GPL-2.0
2 #include "reiserfs.h"
3 #include <linux/capability.h>
4 #include <linux/errno.h>
5 #include <linux/fs.h>
6 #include <linux/pagemap.h>
7 #include <linux/xattr.h>
8 #include "xattr.h"
9 #include <linux/uaccess.h>
10
11 static int
trusted_get(const struct xattr_handler * handler,struct dentry * unused,struct inode * inode,const char * name,void * buffer,size_t size)12 trusted_get(const struct xattr_handler *handler, struct dentry *unused,
13 struct inode *inode, const char *name, void *buffer, size_t size)
14 {
15 if (!capable(CAP_SYS_ADMIN) || IS_PRIVATE(inode))
16 return -EPERM;
17
18 return reiserfs_xattr_get(inode, xattr_full_name(handler, name),
19 buffer, size);
20 }
21
22 static int
trusted_set(const struct xattr_handler * handler,struct user_namespace * mnt_userns,struct dentry * unused,struct inode * inode,const char * name,const void * buffer,size_t size,int flags)23 trusted_set(const struct xattr_handler *handler,
24 struct user_namespace *mnt_userns, struct dentry *unused,
25 struct inode *inode, const char *name, const void *buffer,
26 size_t size, int flags)
27 {
28 if (!capable(CAP_SYS_ADMIN) || IS_PRIVATE(inode))
29 return -EPERM;
30
31 return reiserfs_xattr_set(inode,
32 xattr_full_name(handler, name),
33 buffer, size, flags);
34 }
35
trusted_list(struct dentry * dentry)36 static bool trusted_list(struct dentry *dentry)
37 {
38 return capable(CAP_SYS_ADMIN) && !IS_PRIVATE(d_inode(dentry));
39 }
40
41 const struct xattr_handler reiserfs_xattr_trusted_handler = {
42 .prefix = XATTR_TRUSTED_PREFIX,
43 .get = trusted_get,
44 .set = trusted_set,
45 .list = trusted_list,
46 };
47