fs/ext2/xattr_security.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * linux/fs/ext2/xattr_security.c
   4  * Handler for storing security labels as extended attributes.
   5  */
   6
   7 #include "ext2.h"
   8 #include <linux/security.h>
   9 #include "xattr.h"
  10
  11 static int
  12 ext2_xattr_security_get(const struct xattr_handler *handler,
  13                         struct dentry *unused, struct inode *inode,
  14                         const char *name, void *buffer, size_t size)
  15 {
  16         return ext2_xattr_get(inode, EXT2_XATTR_INDEX_SECURITY, name,
  17                               buffer, size);
  18 }
  19
  20 static int
  21 ext2_xattr_security_set(const struct xattr_handler *handler,
  22                         struct mnt_idmap *idmap,
  23                         struct dentry *unused, struct inode *inode,
  24                         const char *name, const void *value,
  25                         size_t size, int flags)
  26 {
  27         return ext2_xattr_set(inode, EXT2_XATTR_INDEX_SECURITY, name,
  28                               value, size, flags);
  29 }
  30
  31 static int ext2_initxattrs(struct inode *inode, const struct xattr *xattr_array,
  32                            void *fs_info)
  33 {
  34         const struct xattr *xattr;
  35         int err = 0;
  36
  37         for (xattr = xattr_array; xattr->name != NULL; xattr++) {
  38                 err = ext2_xattr_set(inode, EXT2_XATTR_INDEX_SECURITY,
  39                                      xattr->name, xattr->value,
  40                                      xattr->value_len, 0);
  41                 if (err < 0)
  42                         break;
  43         }
  44         return err;
  45 }
  46
  47 int
  48 ext2_init_security(struct inode *inode, struct inode *dir,
  49                    const struct qstr *qstr)
  50 {
  51         return security_inode_init_security(inode, dir, qstr,
  52                                             &ext2_initxattrs, NULL);
  53 }
  54
  55 const struct xattr_handler ext2_xattr_security_handler = {
  56         .prefix = XATTR_SECURITY_PREFIX,
  57         .get    = ext2_xattr_security_get,
  58         .set    = ext2_xattr_security_set,
  59 };