fs/ext4/xattr_security.c

   1 /*
   2  * linux/fs/ext4/xattr_security.c
   3  * Handler for storing security labels as extended attributes.
   4  */
   5
   6 #include <linux/string.h>
   7 #include <linux/fs.h>
   8 #include <linux/security.h>
   9 #include <linux/slab.h>
  10 #include "ext4_jbd2.h"
  11 #include "ext4.h"
  12 #include "xattr.h"
  13
  14 static int
  15 ext4_xattr_security_get(const struct xattr_handler *handler,
  16                         struct dentry *unused, struct inode *inode,
  17                         const char *name, void *buffer, size_t size)
  18 {
  19         return ext4_xattr_get(inode, EXT4_XATTR_INDEX_SECURITY,
  20                               name, buffer, size);
  21 }
  22
  23 static int
  24 ext4_xattr_security_set(const struct xattr_handler *handler,
  25                         struct dentry *unused, struct inode *inode,
  26                         const char *name, const void *value,
  27                         size_t size, int flags)
  28 {
  29         return ext4_xattr_set(inode, EXT4_XATTR_INDEX_SECURITY,
  30                               name, value, size, flags);
  31 }
  32
  33 static int
  34 ext4_initxattrs(struct inode *inode, const struct xattr *xattr_array,
  35                 void *fs_info)
  36 {
  37         const struct xattr *xattr;
  38         handle_t *handle = fs_info;
  39         int err = 0;
  40
  41         for (xattr = xattr_array; xattr->name != NULL; xattr++) {
  42                 err = ext4_xattr_set_handle(handle, inode,
  43                                             EXT4_XATTR_INDEX_SECURITY,
  44                                             xattr->name, xattr->value,
  45                                             xattr->value_len, 0);
  46                 if (err < 0)
  47                         break;
  48         }
  49         return err;
  50 }
  51
  52 int
  53 ext4_init_security(handle_t *handle, struct inode *inode, struct inode *dir,
  54                    const struct qstr *qstr)
  55 {
  56         return security_inode_init_security(inode, dir, qstr,
  57                                             &ext4_initxattrs, handle);
  58 }
  59
  60 const struct xattr_handler ext4_xattr_security_handler = {
  61         .prefix = XATTR_SECURITY_PREFIX,
  62         .get    = ext4_xattr_security_get,
  63         .set    = ext4_xattr_security_set,
  64 };