LXR linux/fs/reiserfs/xattr

   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
  11static int
  12trusted_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
  22static int
  23trusted_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
  36static bool trusted_list(struct dentry *dentry)
  37{
  38        return capable(CAP_SYS_ADMIN) && !IS_PRIVATE(d_inode(dentry));
  39}
  40
  41const 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