1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0
2*4882a593Smuzhiyun #include "reiserfs.h"
3*4882a593Smuzhiyun #include <linux/capability.h>
4*4882a593Smuzhiyun #include <linux/errno.h>
5*4882a593Smuzhiyun #include <linux/fs.h>
6*4882a593Smuzhiyun #include <linux/pagemap.h>
7*4882a593Smuzhiyun #include <linux/xattr.h>
8*4882a593Smuzhiyun #include "xattr.h"
9*4882a593Smuzhiyun #include <linux/uaccess.h>
10*4882a593Smuzhiyun
11*4882a593Smuzhiyun static int
trusted_get(const struct xattr_handler * handler,struct dentry * unused,struct inode * inode,const char * name,void * buffer,size_t size,int flags)12*4882a593Smuzhiyun trusted_get(const struct xattr_handler *handler, struct dentry *unused,
13*4882a593Smuzhiyun struct inode *inode, const char *name, void *buffer, size_t size,
14*4882a593Smuzhiyun int flags)
15*4882a593Smuzhiyun {
16*4882a593Smuzhiyun if (!capable(CAP_SYS_ADMIN) || IS_PRIVATE(inode))
17*4882a593Smuzhiyun return -EPERM;
18*4882a593Smuzhiyun
19*4882a593Smuzhiyun return reiserfs_xattr_get(inode, xattr_full_name(handler, name),
20*4882a593Smuzhiyun buffer, size);
21*4882a593Smuzhiyun }
22*4882a593Smuzhiyun
23*4882a593Smuzhiyun static int
trusted_set(const struct xattr_handler * handler,struct dentry * unused,struct inode * inode,const char * name,const void * buffer,size_t size,int flags)24*4882a593Smuzhiyun trusted_set(const struct xattr_handler *handler, struct dentry *unused,
25*4882a593Smuzhiyun struct inode *inode, const char *name, const void *buffer,
26*4882a593Smuzhiyun size_t size, int flags)
27*4882a593Smuzhiyun {
28*4882a593Smuzhiyun if (!capable(CAP_SYS_ADMIN) || IS_PRIVATE(inode))
29*4882a593Smuzhiyun return -EPERM;
30*4882a593Smuzhiyun
31*4882a593Smuzhiyun return reiserfs_xattr_set(inode,
32*4882a593Smuzhiyun xattr_full_name(handler, name),
33*4882a593Smuzhiyun buffer, size, flags);
34*4882a593Smuzhiyun }
35*4882a593Smuzhiyun
trusted_list(struct dentry * dentry)36*4882a593Smuzhiyun static bool trusted_list(struct dentry *dentry)
37*4882a593Smuzhiyun {
38*4882a593Smuzhiyun return capable(CAP_SYS_ADMIN) && !IS_PRIVATE(d_inode(dentry));
39*4882a593Smuzhiyun }
40*4882a593Smuzhiyun
41*4882a593Smuzhiyun const struct xattr_handler reiserfs_xattr_trusted_handler = {
42*4882a593Smuzhiyun .prefix = XATTR_TRUSTED_PREFIX,
43*4882a593Smuzhiyun .get = trusted_get,
44*4882a593Smuzhiyun .set = trusted_set,
45*4882a593Smuzhiyun .list = trusted_list,
46*4882a593Smuzhiyun };
47