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 *dentry, const char *name,
  17                         void *buffer, size_t size)
  18 {
  19         return ext4_xattr_get(d_inode(dentry), 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 *dentry, const char *name,
  26                         const void *value, size_t size, int flags)
  27 {
  28         return ext4_xattr_set(d_inode(dentry), EXT4_XATTR_INDEX_SECURITY,
  29                               name, value, size, flags);
  30 }
  31
  32 static int
  33 ext4_initxattrs(struct inode *inode, const struct xattr *xattr_array,
  34                 void *fs_info)
  35 {
  36         const struct xattr *xattr;
  37         handle_t *handle = fs_info;
  38         int err = 0;
  39
  40         for (xattr = xattr_array; xattr->name != NULL; xattr++) {
  41                 err = ext4_xattr_set_handle(handle, inode,
  42                                             EXT4_XATTR_INDEX_SECURITY,
  43                                             xattr->name, xattr->value,
  44                                             xattr->value_len, 0);
  45                 if (err < 0)
  46                         break;
  47         }
  48         return err;
  49 }
  50
  51 int
  52 ext4_init_security(handle_t *handle, struct inode *inode, struct inode *dir,
  53                    const struct qstr *qstr)
  54 {
  55         return security_inode_init_security(inode, dir, qstr,
  56                                             &ext4_initxattrs, handle);
  57 }
  58
  59 const struct xattr_handler ext4_xattr_security_handler = {
  60         .prefix = XATTR_SECURITY_PREFIX,
  61         .get    = ext4_xattr_security_get,
  62         .set    = ext4_xattr_security_set,
  63 };