fs/reiserfs/xattr_security.c

   1 #include <linux/reiserfs_fs.h>
   2 #include <linux/errno.h>
   3 #include <linux/fs.h>
   4 #include <linux/pagemap.h>
   5 #include <linux/xattr.h>
   6 #include <linux/reiserfs_xattr.h>
   7 #include <asm/uaccess.h>
   8
   9 static int
  10 security_get(struct inode *inode, const char *name, void *buffer, size_t size)
  11 {
  12         if (strlen(name) < sizeof(XATTR_SECURITY_PREFIX))
  13                 return -EINVAL;
  14
  15         if (is_reiserfs_priv_object(inode))
  16                 return -EPERM;
  17
  18         return reiserfs_xattr_get(inode, name, buffer, size);
  19 }
  20
  21 static int
  22 security_set(struct inode *inode, const char *name, const void *buffer,
  23              size_t size, int flags)
  24 {
  25         if (strlen(name) < sizeof(XATTR_SECURITY_PREFIX))
  26                 return -EINVAL;
  27
  28         if (is_reiserfs_priv_object(inode))
  29                 return -EPERM;
  30
  31         return reiserfs_xattr_set(inode, name, buffer, size, flags);
  32 }
  33
  34 static int security_del(struct inode *inode, const char *name)
  35 {
  36         if (strlen(name) < sizeof(XATTR_SECURITY_PREFIX))
  37                 return -EINVAL;
  38
  39         if (is_reiserfs_priv_object(inode))
  40                 return -EPERM;
  41
  42         return 0;
  43 }
  44
  45 static int
  46 security_list(struct inode *inode, const char *name, int namelen, char *out)
  47 {
  48         int len = namelen;
  49
  50         if (is_reiserfs_priv_object(inode))
  51                 return 0;
  52
  53         if (out)
  54                 memcpy(out, name, len);
  55
  56         return len;
  57 }
  58
  59 struct reiserfs_xattr_handler security_handler = {
  60         .prefix = XATTR_SECURITY_PREFIX,
  61         .get = security_get,
  62         .set = security_set,
  63         .del = security_del,
  64         .list = security_list,
  65 };