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 dentry *unused, struct inode *inode, 27 const char *name, const void *buffer, 28 size_t size, int flags) 29 { 30 return hfsplus_setxattr(inode, name, buffer, size, flags, 31 XATTR_SECURITY_PREFIX, 32 XATTR_SECURITY_PREFIX_LEN); 33 } 34 35 static int hfsplus_initxattrs(struct inode *inode, 36 const struct xattr *xattr_array, 37 void *fs_info) 38 { 39 const struct xattr *xattr; 40 char *xattr_name; 41 int err = 0; 42 43 xattr_name = kmalloc(NLS_MAX_CHARSET_SIZE * HFSPLUS_ATTR_MAX_STRLEN + 1, 44 GFP_KERNEL); 45 if (!xattr_name) 46 return -ENOMEM; 47 for (xattr = xattr_array; xattr->name != NULL; xattr++) { 48 49 if (!strcmp(xattr->name, "")) 50 continue; 51 52 strcpy(xattr_name, XATTR_SECURITY_PREFIX); 53 strcpy(xattr_name + 54 XATTR_SECURITY_PREFIX_LEN, xattr->name); 55 memset(xattr_name + 56 XATTR_SECURITY_PREFIX_LEN + strlen(xattr->name), 0, 1); 57 58 err = __hfsplus_setxattr(inode, xattr_name, 59 xattr->value, xattr->value_len, 0); 60 if (err) 61 break; 62 } 63 kfree(xattr_name); 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 74 const struct xattr_handler hfsplus_xattr_security_handler = { 75 .prefix = XATTR_SECURITY_PREFIX, 76 .get = hfsplus_security_getxattr, 77 .set = hfsplus_security_setxattr, 78 }; 79