1 /* 2 * JFFS2 -- Journalling Flash File System, Version 2. 3 * 4 * Copyright © 2006 NEC Corporation 5 * 6 * Created by KaiGai Kohei <kaigai@ak.jp.nec.com> 7 * 8 * For licensing information, see the file 'LICENCE' in this directory. 9 * 10 */ 11 12 #include <linux/kernel.h> 13 #include <linux/slab.h> 14 #include <linux/fs.h> 15 #include <linux/time.h> 16 #include <linux/pagemap.h> 17 #include <linux/highmem.h> 18 #include <linux/crc32.h> 19 #include <linux/jffs2.h> 20 #include <linux/xattr.h> 21 #include <linux/mtd/mtd.h> 22 #include <linux/security.h> 23 #include "nodelist.h" 24 25 /* ---- Initial Security Label(s) Attachment callback --- */ 26 static int jffs2_initxattrs(struct inode *inode, 27 const struct xattr *xattr_array, void *fs_info) 28 { 29 const struct xattr *xattr; 30 int err = 0; 31 32 for (xattr = xattr_array; xattr->name != NULL; xattr++) { 33 err = do_jffs2_setxattr(inode, JFFS2_XPREFIX_SECURITY, 34 xattr->name, xattr->value, 35 xattr->value_len, 0); 36 if (err < 0) 37 break; 38 } 39 return err; 40 } 41 42 /* ---- Initial Security Label(s) Attachment ----------- */ 43 int jffs2_init_security(struct inode *inode, struct inode *dir, 44 const struct qstr *qstr) 45 { 46 return security_inode_init_security(inode, dir, qstr, 47 &jffs2_initxattrs, NULL); 48 } 49 50 /* ---- XATTR Handler for "security.*" ----------------- */ 51 static int jffs2_security_getxattr(const struct xattr_handler *handler, 52 struct dentry *dentry, const char *name, 53 void *buffer, size_t size) 54 { 55 if (!strcmp(name, "")) 56 return -EINVAL; 57 58 return do_jffs2_getxattr(d_inode(dentry), JFFS2_XPREFIX_SECURITY, 59 name, buffer, size); 60 } 61 62 static int jffs2_security_setxattr(const struct xattr_handler *handler, 63 struct dentry *dentry, const char *name, 64 const void *buffer, size_t size, int flags) 65 { 66 if (!strcmp(name, "")) 67 return -EINVAL; 68 69 return do_jffs2_setxattr(d_inode(dentry), JFFS2_XPREFIX_SECURITY, 70 name, buffer, size, flags); 71 } 72 73 static size_t jffs2_security_listxattr(const struct xattr_handler *handler, 74 struct dentry *dentry, char *list, 75 size_t list_size, const char *name, 76 size_t name_len) 77 { 78 size_t retlen = XATTR_SECURITY_PREFIX_LEN + name_len + 1; 79 80 if (list && retlen <= list_size) { 81 strcpy(list, XATTR_SECURITY_PREFIX); 82 strcpy(list + XATTR_SECURITY_PREFIX_LEN, name); 83 } 84 85 return retlen; 86 } 87 88 const struct xattr_handler jffs2_security_xattr_handler = { 89 .prefix = XATTR_SECURITY_PREFIX, 90 .list = jffs2_security_listxattr, 91 .set = jffs2_security_setxattr, 92 .get = jffs2_security_getxattr 93 }; 94