| 1 | // SPDX-License-Identifier: GPL-2.0 |
| 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> |
| 11 | #include <linux/nls.h> |
| 12 | |
| 13 | #include "hfsplus_fs.h" |
| 14 | #include "xattr.h" |
| 15 | |
| 16 | static int hfsplus_security_getxattr(const struct xattr_handler *handler, |
| 17 | struct dentry *unused, struct inode *inode, |
| 18 | const char *name, void *buffer, size_t size) |
| 19 | { |
| 20 | return hfsplus_getxattr(inode, name, buffer, size, |
| 21 | XATTR_SECURITY_PREFIX, |
| 22 | XATTR_SECURITY_PREFIX_LEN); |
| 23 | } |
| 24 | |
| 25 | static int hfsplus_security_setxattr(const struct xattr_handler *handler, |
| 26 | struct user_namespace *mnt_userns, |
| 27 | struct dentry *unused, struct inode *inode, |
| 28 | const char *name, const void *buffer, |
| 29 | size_t size, int flags) |
| 30 | { |
| 31 | return hfsplus_setxattr(inode, name, buffer, size, flags, |
| 32 | XATTR_SECURITY_PREFIX, |
| 33 | XATTR_SECURITY_PREFIX_LEN); |
| 34 | } |
| 35 | |
| 36 | static int hfsplus_initxattrs(struct inode *inode, |
| 37 | const struct xattr *xattr_array, |
| 38 | void *fs_info) |
| 39 | { |
| 40 | const struct xattr *xattr; |
| 41 | char *xattr_name; |
| 42 | int err = 0; |
| 43 | |
| 44 | xattr_name = kmalloc(NLS_MAX_CHARSET_SIZE * HFSPLUS_ATTR_MAX_STRLEN + 1, |
| 45 | GFP_KERNEL); |
| 46 | if (!xattr_name) |
| 47 | return -ENOMEM; |
| 48 | for (xattr = xattr_array; xattr->name != NULL; xattr++) { |
| 49 | |
| 50 | if (!strcmp(xattr->name, "")) |
| 51 | continue; |
| 52 | |
| 53 | strcpy(xattr_name, XATTR_SECURITY_PREFIX); |
| 54 | strcpy(xattr_name + |
| 55 | XATTR_SECURITY_PREFIX_LEN, xattr->name); |
| 56 | memset(xattr_name + |
| 57 | XATTR_SECURITY_PREFIX_LEN + strlen(xattr->name), 0, 1); |
| 58 | |
| 59 | err = __hfsplus_setxattr(inode, xattr_name, |
| 60 | xattr->value, xattr->value_len, 0); |
| 61 | if (err) |
| 62 | break; |
| 63 | } |
| 64 | kfree(xattr_name); |
| 65 | return err; |
| 66 | } |
| 67 | |
| 68 | int hfsplus_init_security(struct inode *inode, struct inode *dir, |
| 69 | const struct qstr *qstr) |
| 70 | { |
| 71 | return security_inode_init_security(inode, dir, qstr, |
| 72 | &hfsplus_initxattrs, NULL); |
| 73 | } |
| 74 | |
| 75 | const struct xattr_handler hfsplus_xattr_security_handler = { |
| 76 | .prefix = XATTR_SECURITY_PREFIX, |
| 77 | .get = hfsplus_security_getxattr, |
| 78 | .set = hfsplus_security_setxattr, |
| 79 | }; |