Greg Kroah-Hartman | b244131 | 2017-11-01 15:07:57 +0100 | [diff] [blame] | 1 | // SPDX-License-Identifier: GPL-2.0 |
Vyacheslav Dubeyko | 127e5f5 | 2013-02-27 17:03:03 -0800 | [diff] [blame] | 2 | /* |
| 3 | * linux/fs/hfsplus/xattr_trusted.c |
| 4 | * |
| 5 | * Vyacheslav Dubeyko <slava@dubeyko.com> |
| 6 | * |
| 7 | * Handler for storing security labels as extended attributes. |
| 8 | */ |
| 9 | |
| 10 | #include <linux/security.h> |
Hin-Tak Leung | bf29e88 | 2014-06-06 14:36:22 -0700 | [diff] [blame] | 11 | #include <linux/nls.h> |
| 12 | |
Vyacheslav Dubeyko | 127e5f5 | 2013-02-27 17:03:03 -0800 | [diff] [blame] | 13 | #include "hfsplus_fs.h" |
| 14 | #include "xattr.h" |
| 15 | |
Andreas Gruenbacher | d9a82a0 | 2015-10-04 19:18:51 +0200 | [diff] [blame] | 16 | static int hfsplus_security_getxattr(const struct xattr_handler *handler, |
Al Viro | b296821 | 2016-04-10 20:48:24 -0400 | [diff] [blame] | 17 | struct dentry *unused, struct inode *inode, |
| 18 | const char *name, void *buffer, size_t size) |
Vyacheslav Dubeyko | 127e5f5 | 2013-02-27 17:03:03 -0800 | [diff] [blame] | 19 | { |
Al Viro | b296821 | 2016-04-10 20:48:24 -0400 | [diff] [blame] | 20 | return hfsplus_getxattr(inode, name, buffer, size, |
Fabian Frederick | a3cef4c | 2015-04-16 12:46:58 -0700 | [diff] [blame] | 21 | XATTR_SECURITY_PREFIX, |
| 22 | XATTR_SECURITY_PREFIX_LEN); |
Vyacheslav Dubeyko | 127e5f5 | 2013-02-27 17:03:03 -0800 | [diff] [blame] | 23 | } |
| 24 | |
Andreas Gruenbacher | d9a82a0 | 2015-10-04 19:18:51 +0200 | [diff] [blame] | 25 | static int hfsplus_security_setxattr(const struct xattr_handler *handler, |
Al Viro | 5930122 | 2016-05-27 10:19:30 -0400 | [diff] [blame] | 26 | struct dentry *unused, struct inode *inode, |
| 27 | const char *name, const void *buffer, |
| 28 | size_t size, int flags) |
Vyacheslav Dubeyko | 127e5f5 | 2013-02-27 17:03:03 -0800 | [diff] [blame] | 29 | { |
Al Viro | 5930122 | 2016-05-27 10:19:30 -0400 | [diff] [blame] | 30 | return hfsplus_setxattr(inode, name, buffer, size, flags, |
Fabian Frederick | 5e61473 | 2015-04-16 12:47:01 -0700 | [diff] [blame] | 31 | XATTR_SECURITY_PREFIX, |
| 32 | XATTR_SECURITY_PREFIX_LEN); |
Vyacheslav Dubeyko | 127e5f5 | 2013-02-27 17:03:03 -0800 | [diff] [blame] | 33 | } |
| 34 | |
Vyacheslav Dubeyko | 127e5f5 | 2013-02-27 17:03:03 -0800 | [diff] [blame] | 35 | static int hfsplus_initxattrs(struct inode *inode, |
| 36 | const struct xattr *xattr_array, |
| 37 | void *fs_info) |
| 38 | { |
| 39 | const struct xattr *xattr; |
Hin-Tak Leung | bf29e88 | 2014-06-06 14:36:22 -0700 | [diff] [blame] | 40 | char *xattr_name; |
Vyacheslav Dubeyko | 127e5f5 | 2013-02-27 17:03:03 -0800 | [diff] [blame] | 41 | int err = 0; |
| 42 | |
Hin-Tak Leung | bf29e88 | 2014-06-06 14:36:22 -0700 | [diff] [blame] | 43 | xattr_name = kmalloc(NLS_MAX_CHARSET_SIZE * HFSPLUS_ATTR_MAX_STRLEN + 1, |
| 44 | GFP_KERNEL); |
| 45 | if (!xattr_name) |
| 46 | return -ENOMEM; |
Vyacheslav Dubeyko | 127e5f5 | 2013-02-27 17:03:03 -0800 | [diff] [blame] | 47 | for (xattr = xattr_array; xattr->name != NULL; xattr++) { |
Vyacheslav Dubeyko | 127e5f5 | 2013-02-27 17:03:03 -0800 | [diff] [blame] | 48 | |
Hin-Tak Leung | bf29e88 | 2014-06-06 14:36:22 -0700 | [diff] [blame] | 49 | if (!strcmp(xattr->name, "")) |
Vyacheslav Dubeyko | 127e5f5 | 2013-02-27 17:03:03 -0800 | [diff] [blame] | 50 | continue; |
| 51 | |
Vyacheslav Dubeyko | 127e5f5 | 2013-02-27 17:03:03 -0800 | [diff] [blame] | 52 | strcpy(xattr_name, XATTR_SECURITY_PREFIX); |
| 53 | strcpy(xattr_name + |
| 54 | XATTR_SECURITY_PREFIX_LEN, xattr->name); |
| 55 | memset(xattr_name + |
Hin-Tak Leung | bf29e88 | 2014-06-06 14:36:22 -0700 | [diff] [blame] | 56 | XATTR_SECURITY_PREFIX_LEN + strlen(xattr->name), 0, 1); |
Vyacheslav Dubeyko | 127e5f5 | 2013-02-27 17:03:03 -0800 | [diff] [blame] | 57 | |
| 58 | err = __hfsplus_setxattr(inode, xattr_name, |
| 59 | xattr->value, xattr->value_len, 0); |
| 60 | if (err) |
| 61 | break; |
| 62 | } |
Hin-Tak Leung | bf29e88 | 2014-06-06 14:36:22 -0700 | [diff] [blame] | 63 | kfree(xattr_name); |
Vyacheslav Dubeyko | 127e5f5 | 2013-02-27 17:03:03 -0800 | [diff] [blame] | 64 | return err; |
| 65 | } |
| 66 | |
| 67 | int hfsplus_init_security(struct inode *inode, struct inode *dir, |
| 68 | const struct qstr *qstr) |
| 69 | { |
| 70 | return security_inode_init_security(inode, dir, qstr, |
| 71 | &hfsplus_initxattrs, NULL); |
| 72 | } |
| 73 | |
Vyacheslav Dubeyko | 127e5f5 | 2013-02-27 17:03:03 -0800 | [diff] [blame] | 74 | const struct xattr_handler hfsplus_xattr_security_handler = { |
| 75 | .prefix = XATTR_SECURITY_PREFIX, |
Vyacheslav Dubeyko | 127e5f5 | 2013-02-27 17:03:03 -0800 | [diff] [blame] | 76 | .get = hfsplus_security_getxattr, |
| 77 | .set = hfsplus_security_setxattr, |
| 78 | }; |