VisionFive2 Linux kernel

b24413180f560 (Greg Kroah-Hartman  2017-11-01 15:07:57 +0100  1) // SPDX-License-Identifier: GPL-2.0
127e5f5ae51ef (Vyacheslav Dubeyko  2013-02-27 17:03:03 -0800  2) /*
127e5f5ae51ef (Vyacheslav Dubeyko  2013-02-27 17:03:03 -0800  3)  * linux/fs/hfsplus/xattr_trusted.c
127e5f5ae51ef (Vyacheslav Dubeyko  2013-02-27 17:03:03 -0800  4)  *
127e5f5ae51ef (Vyacheslav Dubeyko  2013-02-27 17:03:03 -0800  5)  * Vyacheslav Dubeyko <slava@dubeyko.com>
127e5f5ae51ef (Vyacheslav Dubeyko  2013-02-27 17:03:03 -0800  6)  *
127e5f5ae51ef (Vyacheslav Dubeyko  2013-02-27 17:03:03 -0800  7)  * Handler for storing security labels as extended attributes.
127e5f5ae51ef (Vyacheslav Dubeyko  2013-02-27 17:03:03 -0800  8)  */
127e5f5ae51ef (Vyacheslav Dubeyko  2013-02-27 17:03:03 -0800  9) 
127e5f5ae51ef (Vyacheslav Dubeyko  2013-02-27 17:03:03 -0800 10) #include <linux/security.h>
bf29e886b242c (Hin-Tak Leung       2014-06-06 14:36:22 -0700 11) #include <linux/nls.h>
bf29e886b242c (Hin-Tak Leung       2014-06-06 14:36:22 -0700 12) 
127e5f5ae51ef (Vyacheslav Dubeyko  2013-02-27 17:03:03 -0800 13) #include "hfsplus_fs.h"
127e5f5ae51ef (Vyacheslav Dubeyko  2013-02-27 17:03:03 -0800 14) #include "xattr.h"
127e5f5ae51ef (Vyacheslav Dubeyko  2013-02-27 17:03:03 -0800 15) 
d9a82a04033f8 (Andreas Gruenbacher 2015-10-04 19:18:51 +0200 16) static int hfsplus_security_getxattr(const struct xattr_handler *handler,
b296821a7c42f (Al Viro             2016-04-10 20:48:24 -0400 17) 				     struct dentry *unused, struct inode *inode,
b296821a7c42f (Al Viro             2016-04-10 20:48:24 -0400 18) 				     const char *name, void *buffer, size_t size)
127e5f5ae51ef (Vyacheslav Dubeyko  2013-02-27 17:03:03 -0800 19) {
b296821a7c42f (Al Viro             2016-04-10 20:48:24 -0400 20) 	return hfsplus_getxattr(inode, name, buffer, size,
a3cef4cd6886c (Fabian Frederick    2015-04-16 12:46:58 -0700 21) 				XATTR_SECURITY_PREFIX,
a3cef4cd6886c (Fabian Frederick    2015-04-16 12:46:58 -0700 22) 				XATTR_SECURITY_PREFIX_LEN);
127e5f5ae51ef (Vyacheslav Dubeyko  2013-02-27 17:03:03 -0800 23) }
127e5f5ae51ef (Vyacheslav Dubeyko  2013-02-27 17:03:03 -0800 24) 
d9a82a04033f8 (Andreas Gruenbacher 2015-10-04 19:18:51 +0200 25) static int hfsplus_security_setxattr(const struct xattr_handler *handler,
e65ce2a50cf6a (Christian Brauner   2021-01-21 14:19:27 +0100 26) 				     struct user_namespace *mnt_userns,
5930122683dff (Al Viro             2016-05-27 10:19:30 -0400 27) 				     struct dentry *unused, struct inode *inode,
5930122683dff (Al Viro             2016-05-27 10:19:30 -0400 28) 				     const char *name, const void *buffer,
5930122683dff (Al Viro             2016-05-27 10:19:30 -0400 29) 				     size_t size, int flags)
127e5f5ae51ef (Vyacheslav Dubeyko  2013-02-27 17:03:03 -0800 30) {
5930122683dff (Al Viro             2016-05-27 10:19:30 -0400 31) 	return hfsplus_setxattr(inode, name, buffer, size, flags,
5e61473ea9f1e (Fabian Frederick    2015-04-16 12:47:01 -0700 32) 				XATTR_SECURITY_PREFIX,
5e61473ea9f1e (Fabian Frederick    2015-04-16 12:47:01 -0700 33) 				XATTR_SECURITY_PREFIX_LEN);
127e5f5ae51ef (Vyacheslav Dubeyko  2013-02-27 17:03:03 -0800 34) }
127e5f5ae51ef (Vyacheslav Dubeyko  2013-02-27 17:03:03 -0800 35) 
127e5f5ae51ef (Vyacheslav Dubeyko  2013-02-27 17:03:03 -0800 36) static int hfsplus_initxattrs(struct inode *inode,
127e5f5ae51ef (Vyacheslav Dubeyko  2013-02-27 17:03:03 -0800 37) 				const struct xattr *xattr_array,
127e5f5ae51ef (Vyacheslav Dubeyko  2013-02-27 17:03:03 -0800 38) 				void *fs_info)
127e5f5ae51ef (Vyacheslav Dubeyko  2013-02-27 17:03:03 -0800 39) {
127e5f5ae51ef (Vyacheslav Dubeyko  2013-02-27 17:03:03 -0800 40) 	const struct xattr *xattr;
bf29e886b242c (Hin-Tak Leung       2014-06-06 14:36:22 -0700 41) 	char *xattr_name;
127e5f5ae51ef (Vyacheslav Dubeyko  2013-02-27 17:03:03 -0800 42) 	int err = 0;
127e5f5ae51ef (Vyacheslav Dubeyko  2013-02-27 17:03:03 -0800 43) 
bf29e886b242c (Hin-Tak Leung       2014-06-06 14:36:22 -0700 44) 	xattr_name = kmalloc(NLS_MAX_CHARSET_SIZE * HFSPLUS_ATTR_MAX_STRLEN + 1,
bf29e886b242c (Hin-Tak Leung       2014-06-06 14:36:22 -0700 45) 		GFP_KERNEL);
bf29e886b242c (Hin-Tak Leung       2014-06-06 14:36:22 -0700 46) 	if (!xattr_name)
bf29e886b242c (Hin-Tak Leung       2014-06-06 14:36:22 -0700 47) 		return -ENOMEM;
127e5f5ae51ef (Vyacheslav Dubeyko  2013-02-27 17:03:03 -0800 48) 	for (xattr = xattr_array; xattr->name != NULL; xattr++) {
127e5f5ae51ef (Vyacheslav Dubeyko  2013-02-27 17:03:03 -0800 49) 
bf29e886b242c (Hin-Tak Leung       2014-06-06 14:36:22 -0700 50) 		if (!strcmp(xattr->name, ""))
127e5f5ae51ef (Vyacheslav Dubeyko  2013-02-27 17:03:03 -0800 51) 			continue;
127e5f5ae51ef (Vyacheslav Dubeyko  2013-02-27 17:03:03 -0800 52) 
127e5f5ae51ef (Vyacheslav Dubeyko  2013-02-27 17:03:03 -0800 53) 		strcpy(xattr_name, XATTR_SECURITY_PREFIX);
127e5f5ae51ef (Vyacheslav Dubeyko  2013-02-27 17:03:03 -0800 54) 		strcpy(xattr_name +
127e5f5ae51ef (Vyacheslav Dubeyko  2013-02-27 17:03:03 -0800 55) 			XATTR_SECURITY_PREFIX_LEN, xattr->name);
127e5f5ae51ef (Vyacheslav Dubeyko  2013-02-27 17:03:03 -0800 56) 		memset(xattr_name +
bf29e886b242c (Hin-Tak Leung       2014-06-06 14:36:22 -0700 57) 			XATTR_SECURITY_PREFIX_LEN + strlen(xattr->name), 0, 1);
127e5f5ae51ef (Vyacheslav Dubeyko  2013-02-27 17:03:03 -0800 58) 
127e5f5ae51ef (Vyacheslav Dubeyko  2013-02-27 17:03:03 -0800 59) 		err = __hfsplus_setxattr(inode, xattr_name,
127e5f5ae51ef (Vyacheslav Dubeyko  2013-02-27 17:03:03 -0800 60) 					xattr->value, xattr->value_len, 0);
127e5f5ae51ef (Vyacheslav Dubeyko  2013-02-27 17:03:03 -0800 61) 		if (err)
127e5f5ae51ef (Vyacheslav Dubeyko  2013-02-27 17:03:03 -0800 62) 			break;
127e5f5ae51ef (Vyacheslav Dubeyko  2013-02-27 17:03:03 -0800 63) 	}
bf29e886b242c (Hin-Tak Leung       2014-06-06 14:36:22 -0700 64) 	kfree(xattr_name);
127e5f5ae51ef (Vyacheslav Dubeyko  2013-02-27 17:03:03 -0800 65) 	return err;
127e5f5ae51ef (Vyacheslav Dubeyko  2013-02-27 17:03:03 -0800 66) }
127e5f5ae51ef (Vyacheslav Dubeyko  2013-02-27 17:03:03 -0800 67) 
127e5f5ae51ef (Vyacheslav Dubeyko  2013-02-27 17:03:03 -0800 68) int hfsplus_init_security(struct inode *inode, struct inode *dir,
127e5f5ae51ef (Vyacheslav Dubeyko  2013-02-27 17:03:03 -0800 69) 				const struct qstr *qstr)
127e5f5ae51ef (Vyacheslav Dubeyko  2013-02-27 17:03:03 -0800 70) {
127e5f5ae51ef (Vyacheslav Dubeyko  2013-02-27 17:03:03 -0800 71) 	return security_inode_init_security(inode, dir, qstr,
127e5f5ae51ef (Vyacheslav Dubeyko  2013-02-27 17:03:03 -0800 72) 					&hfsplus_initxattrs, NULL);
127e5f5ae51ef (Vyacheslav Dubeyko  2013-02-27 17:03:03 -0800 73) }
127e5f5ae51ef (Vyacheslav Dubeyko  2013-02-27 17:03:03 -0800 74) 
127e5f5ae51ef (Vyacheslav Dubeyko  2013-02-27 17:03:03 -0800 75) const struct xattr_handler hfsplus_xattr_security_handler = {
127e5f5ae51ef (Vyacheslav Dubeyko  2013-02-27 17:03:03 -0800 76) 	.prefix	= XATTR_SECURITY_PREFIX,
127e5f5ae51ef (Vyacheslav Dubeyko  2013-02-27 17:03:03 -0800 77) 	.get	= hfsplus_security_getxattr,
127e5f5ae51ef (Vyacheslav Dubeyko  2013-02-27 17:03:03 -0800 78) 	.set	= hfsplus_security_setxattr,
127e5f5ae51ef (Vyacheslav Dubeyko  2013-02-27 17:03:03 -0800 79) };