linux/fs/ext3/xattr_security.c
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   1/*
   2 * linux/fs/ext3/xattr_security.c
   3 * Handler for storing security labels as extended attributes.
   4 */
   5
   6#include <linux/module.h>
   7#include <linux/slab.h>
   8#include <linux/string.h>
   9#include <linux/fs.h>
  10#include <linux/ext3_jbd.h>
  11#include <linux/ext3_fs.h>
  12#include <linux/security.h>
  13#include "xattr.h"
  14
  15static size_t
  16ext3_xattr_security_list(struct dentry *dentry, char *list, size_t list_size,
  17                         const char *name, size_t name_len, int type)
  18{
  19        const size_t prefix_len = XATTR_SECURITY_PREFIX_LEN;
  20        const size_t total_len = prefix_len + name_len + 1;
  21
  22
  23        if (list && total_len <= list_size) {
  24                memcpy(list, XATTR_SECURITY_PREFIX, prefix_len);
  25                memcpy(list+prefix_len, name, name_len);
  26                list[prefix_len + name_len] = '\0';
  27        }
  28        return total_len;
  29}
  30
  31static int
  32ext3_xattr_security_get(struct dentry *dentry, const char *name,
  33                void *buffer, size_t size, int type)
  34{
  35        if (strcmp(name, "") == 0)
  36                return -EINVAL;
  37        return ext3_xattr_get(dentry->d_inode, EXT3_XATTR_INDEX_SECURITY,
  38                              name, buffer, size);
  39}
  40
  41static int
  42ext3_xattr_security_set(struct dentry *dentry, const char *name,
  43                const void *value, size_t size, int flags, int type)
  44{
  45        if (strcmp(name, "") == 0)
  46                return -EINVAL;
  47        return ext3_xattr_set(dentry->d_inode, EXT3_XATTR_INDEX_SECURITY,
  48                              name, value, size, flags);
  49}
  50
  51int
  52ext3_init_security(handle_t *handle, struct inode *inode, struct inode *dir)
  53{
  54        int err;
  55        size_t len;
  56        void *value;
  57        char *name;
  58
  59        err = security_inode_init_security(inode, dir, &name, &value, &len);
  60        if (err) {
  61                if (err == -EOPNOTSUPP)
  62                        return 0;
  63                return err;
  64        }
  65        err = ext3_xattr_set_handle(handle, inode, EXT3_XATTR_INDEX_SECURITY,
  66                                    name, value, len, 0);
  67        kfree(name);
  68        kfree(value);
  69        return err;
  70}
  71
  72const struct xattr_handler ext3_xattr_security_handler = {
  73        .prefix = XATTR_SECURITY_PREFIX,
  74        .list   = ext3_xattr_security_list,
  75        .get    = ext3_xattr_security_get,
  76        .set    = ext3_xattr_security_set,
  77};
  78