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