fs/reiserfs/xattr_trusted.c

   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
  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
  23 trusted_set(const struct xattr_handler *handler,
  24             struct mnt_idmap *idmap, 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
  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 };