fs/reiserfs/xattr_trusted.c

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