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Linux/fs/ext2/xattr_trusted.c

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  1 /*
  2  * linux/fs/ext2/xattr_trusted.c
  3  * Handler for trusted extended attributes.
  4  *
  5  * Copyright (C) 2003 by Andreas Gruenbacher, <a.gruenbacher@computer.org>
  6  */
  7 
  8 #include <linux/module.h>
  9 #include <linux/string.h>
 10 #include <linux/capability.h>
 11 #include <linux/fs.h>
 12 #include <linux/ext2_fs.h>
 13 #include "xattr.h"
 14 
 15 static size_t
 16 ext2_xattr_trusted_list(struct inode *inode, char *list, size_t list_size,
 17                         const char *name, size_t name_len)
 18 {
 19         const int prefix_len = XATTR_TRUSTED_PREFIX_LEN;
 20         const size_t total_len = prefix_len + name_len + 1;
 21 
 22         if (!capable(CAP_SYS_ADMIN))
 23                 return 0;
 24 
 25         if (list && total_len <= list_size) {
 26                 memcpy(list, XATTR_TRUSTED_PREFIX, prefix_len);
 27                 memcpy(list+prefix_len, name, name_len);
 28                 list[prefix_len + name_len] = '\0';
 29         }
 30         return total_len;
 31 }
 32 
 33 static int
 34 ext2_xattr_trusted_get(struct inode *inode, const char *name,
 35                        void *buffer, size_t size)
 36 {
 37         if (strcmp(name, "") == 0)
 38                 return -EINVAL;
 39         return ext2_xattr_get(inode, EXT2_XATTR_INDEX_TRUSTED, name,
 40                               buffer, size);
 41 }
 42 
 43 static int
 44 ext2_xattr_trusted_set(struct inode *inode, const char *name,
 45                        const void *value, size_t size, int flags)
 46 {
 47         if (strcmp(name, "") == 0)
 48                 return -EINVAL;
 49         return ext2_xattr_set(inode, EXT2_XATTR_INDEX_TRUSTED, name,
 50                               value, size, flags);
 51 }
 52 
 53 struct xattr_handler ext2_xattr_trusted_handler = {
 54         .prefix = XATTR_TRUSTED_PREFIX,
 55         .list   = ext2_xattr_trusted_list,
 56         .get    = ext2_xattr_trusted_get,
 57         .set    = ext2_xattr_trusted_set,
 58 };
 59 

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