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 #define XATTR_TRUSTED_PREFIX "trusted."
  11
  12 static int
  13 trusted_get(struct inode *inode, const char *name, void *buffer, size_t size)
  14 {
  15         if (strlen(name) < sizeof(XATTR_TRUSTED_PREFIX))
  16                 return -EINVAL;
  17
  18         if (!reiserfs_xattrs(inode->i_sb))
  19                 return -EOPNOTSUPP;
  20
  21         if (!(capable(CAP_SYS_ADMIN) || is_reiserfs_priv_object(inode)))
  22                 return -EPERM;
  23
  24         return reiserfs_xattr_get(inode, name, buffer, size);
  25 }
  26
  27 static int
  28 trusted_set(struct inode *inode, const char *name, const void *buffer,
  29             size_t size, int flags)
  30 {
  31         if (strlen(name) < sizeof(XATTR_TRUSTED_PREFIX))
  32                 return -EINVAL;
  33
  34         if (!reiserfs_xattrs(inode->i_sb))
  35                 return -EOPNOTSUPP;
  36
  37         if (!(capable(CAP_SYS_ADMIN) || is_reiserfs_priv_object(inode)))
  38                 return -EPERM;
  39
  40         return reiserfs_xattr_set(inode, name, buffer, size, flags);
  41 }
  42
  43 static int trusted_del(struct inode *inode, const char *name)
  44 {
  45         if (strlen(name) < sizeof(XATTR_TRUSTED_PREFIX))
  46                 return -EINVAL;
  47
  48         if (!reiserfs_xattrs(inode->i_sb))
  49                 return -EOPNOTSUPP;
  50
  51         if (!(capable(CAP_SYS_ADMIN) || is_reiserfs_priv_object(inode)))
  52                 return -EPERM;
  53
  54         return 0;
  55 }
  56
  57 static int
  58 trusted_list(struct inode *inode, const char *name, int namelen, char *out)
  59 {
  60         int len = namelen;
  61
  62         if (!reiserfs_xattrs(inode->i_sb))
  63                 return 0;
  64
  65         if (!(capable(CAP_SYS_ADMIN) || is_reiserfs_priv_object(inode)))
  66                 return 0;
  67
  68         if (out)
  69                 memcpy(out, name, len);
  70
  71         return len;
  72 }
  73
  74 struct reiserfs_xattr_handler trusted_handler = {
  75         .prefix = XATTR_TRUSTED_PREFIX,
  76         .get = trusted_get,
  77         .set = trusted_set,
  78         .del = trusted_del,
  79         .list = trusted_list,
  80 };