kernel/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 *dentry,
  12             const char *name, void *buffer, size_t size)
  13 {
  14         if (!capable(CAP_SYS_ADMIN) || IS_PRIVATE(d_inode(dentry)))
  15                 return -EPERM;
  16
  17         return reiserfs_xattr_get(d_inode(dentry),
  18                                   xattr_full_name(handler, name),
  19                                   buffer, size);
  20 }
  21
  22 static int
  23 trusted_set(const struct xattr_handler *handler, struct dentry *dentry,
  24             const char *name, const void *buffer, size_t size, int flags)
  25 {
  26         if (!capable(CAP_SYS_ADMIN) || IS_PRIVATE(d_inode(dentry)))
  27                 return -EPERM;
  28
  29         return reiserfs_xattr_set(d_inode(dentry),
  30                                   xattr_full_name(handler, name),
  31                                   buffer, size, flags);
  32 }
  33
  34 static size_t trusted_list(const struct xattr_handler *handler,
  35                            struct dentry *dentry, char *list, size_t list_size,
  36                            const char *name, size_t name_len)
  37 {
  38         const size_t len = name_len + 1;
  39
  40         if (!capable(CAP_SYS_ADMIN) || IS_PRIVATE(d_inode(dentry)))
  41                 return 0;
  42
  43         if (list && len <= list_size) {
  44                 memcpy(list, name, name_len);
  45                 list[name_len] = '\0';
  46         }
  47         return len;
  48 }
  49
  50 const struct xattr_handler reiserfs_xattr_trusted_handler = {
  51         .prefix = XATTR_TRUSTED_PREFIX,
  52         .get = trusted_get,
  53         .set = trusted_set,
  54         .list = trusted_list,
  55 };