fs/reiserfs/xattr_trusted.c

   1 #include <linux/reiserfs_fs.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 <linux/reiserfs_xattr.h>
   8 #include <asm/uaccess.h>
   9
  10 static int
  11 trusted_get(struct inode *inode, const char *name, void *buffer, size_t size)
  12 {
  13         if (strlen(name) < sizeof(XATTR_TRUSTED_PREFIX))
  14                 return -EINVAL;
  15
  16         if (!capable(CAP_SYS_ADMIN) || IS_PRIVATE(inode))
  17                 return -EPERM;
  18
  19         return reiserfs_xattr_get(inode, name, buffer, size);
  20 }
  21
  22 static int
  23 trusted_set(struct inode *inode, const char *name, const void *buffer,
  24             size_t size, int flags)
  25 {
  26         if (strlen(name) < sizeof(XATTR_TRUSTED_PREFIX))
  27                 return -EINVAL;
  28
  29         if (!capable(CAP_SYS_ADMIN) || IS_PRIVATE(inode))
  30                 return -EPERM;
  31
  32         return reiserfs_xattr_set(inode, name, buffer, size, flags);
  33 }
  34
  35 static size_t trusted_list(struct inode *inode, 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(inode))
  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 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 };