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 #define XATTR_SECURITY_PREFIX "security."
  10
  11 static int
  12 security_get(struct inode *inode, const char *name, void *buffer, size_t size)
  13 {
  14         if (strlen(name) < sizeof(XATTR_SECURITY_PREFIX))
  15                 return -EINVAL;
  16
  17         if (is_reiserfs_priv_object(inode))
  18                 return -EPERM;
  19
  20         return reiserfs_xattr_get(inode, name, buffer, size);
  21 }
  22
  23 static int
  24 security_set(struct inode *inode, const char *name, const void *buffer,
  25              size_t size, int flags)
  26 {
  27         if (strlen(name) < sizeof(XATTR_SECURITY_PREFIX))
  28                 return -EINVAL;
  29
  30         if (is_reiserfs_priv_object(inode))
  31                 return -EPERM;
  32
  33         return reiserfs_xattr_set(inode, name, buffer, size, flags);
  34 }
  35
  36 static int security_del(struct inode *inode, const char *name)
  37 {
  38         if (strlen(name) < sizeof(XATTR_SECURITY_PREFIX))
  39                 return -EINVAL;
  40
  41         if (is_reiserfs_priv_object(inode))
  42                 return -EPERM;
  43
  44         return 0;
  45 }
  46
  47 static int
  48 security_list(struct inode *inode, const char *name, int namelen, char *out)
  49 {
  50         int len = namelen;
  51
  52         if (is_reiserfs_priv_object(inode))
  53                 return 0;
  54
  55         if (out)
  56                 memcpy(out, name, len);
  57
  58         return len;
  59 }
  60
  61 struct reiserfs_xattr_handler security_handler = {
  62         .prefix = XATTR_SECURITY_PREFIX,
  63         .get = security_get,
  64         .set = security_set,
  65         .del = security_del,
  66         .list = security_list,
  67 };