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Linux/fs/ext4/xattr_security.c

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  1 // SPDX-License-Identifier: GPL-2.0
  2 /*
  3  * linux/fs/ext4/xattr_security.c
  4  * Handler for storing security labels as extended attributes.
  5  */
  6 
  7 #include <linux/string.h>
  8 #include <linux/fs.h>
  9 #include <linux/security.h>
 10 #include <linux/slab.h>
 11 #include "ext4_jbd2.h"
 12 #include "ext4.h"
 13 #include "xattr.h"
 14 
 15 static int
 16 ext4_xattr_security_get(const struct xattr_handler *handler,
 17                         struct dentry *unused, struct inode *inode,
 18                         const char *name, void *buffer, size_t size)
 19 {
 20         return ext4_xattr_get(inode, EXT4_XATTR_INDEX_SECURITY,
 21                               name, buffer, size);
 22 }
 23 
 24 static int
 25 ext4_xattr_security_set(const struct xattr_handler *handler,
 26                         struct dentry *unused, struct inode *inode,
 27                         const char *name, const void *value,
 28                         size_t size, int flags)
 29 {
 30         return ext4_xattr_set(inode, EXT4_XATTR_INDEX_SECURITY,
 31                               name, value, size, flags);
 32 }
 33 
 34 static int
 35 ext4_initxattrs(struct inode *inode, const struct xattr *xattr_array,
 36                 void *fs_info)
 37 {
 38         const struct xattr *xattr;
 39         handle_t *handle = fs_info;
 40         int err = 0;
 41 
 42         for (xattr = xattr_array; xattr->name != NULL; xattr++) {
 43                 err = ext4_xattr_set_handle(handle, inode,
 44                                             EXT4_XATTR_INDEX_SECURITY,
 45                                             xattr->name, xattr->value,
 46                                             xattr->value_len, XATTR_CREATE);
 47                 if (err < 0)
 48                         break;
 49         }
 50         return err;
 51 }
 52 
 53 int
 54 ext4_init_security(handle_t *handle, struct inode *inode, struct inode *dir,
 55                    const struct qstr *qstr)
 56 {
 57         return security_inode_init_security(inode, dir, qstr,
 58                                             &ext4_initxattrs, handle);
 59 }
 60 
 61 const struct xattr_handler ext4_xattr_security_handler = {
 62         .prefix = XATTR_SECURITY_PREFIX,
 63         .get    = ext4_xattr_security_get,
 64         .set    = ext4_xattr_security_set,
 65 };
 66 

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