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 }; 80