1652ecc20SKaiGai Kohei /* 2652ecc20SKaiGai Kohei * JFFS2 -- Journalling Flash File System, Version 2. 3aa98d7cfSKaiGai Kohei * 4c00c310eSDavid Woodhouse * Copyright © 2006 NEC Corporation 5aa98d7cfSKaiGai Kohei * 6652ecc20SKaiGai Kohei * Created by KaiGai Kohei <kaigai@ak.jp.nec.com> 7652ecc20SKaiGai Kohei * 8652ecc20SKaiGai Kohei * For licensing information, see the file 'LICENCE' in this directory. 9652ecc20SKaiGai Kohei * 10652ecc20SKaiGai Kohei */ 11c00c310eSDavid Woodhouse 12aa98d7cfSKaiGai Kohei #include <linux/kernel.h> 13aa98d7cfSKaiGai Kohei #include <linux/slab.h> 14aa98d7cfSKaiGai Kohei #include <linux/fs.h> 15aa98d7cfSKaiGai Kohei #include <linux/time.h> 16aa98d7cfSKaiGai Kohei #include <linux/pagemap.h> 17aa98d7cfSKaiGai Kohei #include <linux/highmem.h> 18aa98d7cfSKaiGai Kohei #include <linux/crc32.h> 19aa98d7cfSKaiGai Kohei #include <linux/jffs2.h> 20aa98d7cfSKaiGai Kohei #include <linux/xattr.h> 21aa98d7cfSKaiGai Kohei #include <linux/mtd/mtd.h> 22aa98d7cfSKaiGai Kohei #include <linux/security.h> 23aa98d7cfSKaiGai Kohei #include "nodelist.h" 24aa98d7cfSKaiGai Kohei 259d8f13baSMimi Zohar /* ---- Initial Security Label(s) Attachment callback --- */ 26273a65adSNikola Pajkovsky static int jffs2_initxattrs(struct inode *inode, 27273a65adSNikola Pajkovsky const struct xattr *xattr_array, void *fs_info) 289d8f13baSMimi Zohar { 299d8f13baSMimi Zohar const struct xattr *xattr; 309d8f13baSMimi Zohar int err = 0; 319d8f13baSMimi Zohar 329d8f13baSMimi Zohar for (xattr = xattr_array; xattr->name != NULL; xattr++) { 339d8f13baSMimi Zohar err = do_jffs2_setxattr(inode, JFFS2_XPREFIX_SECURITY, 349d8f13baSMimi Zohar xattr->name, xattr->value, 359d8f13baSMimi Zohar xattr->value_len, 0); 369d8f13baSMimi Zohar if (err < 0) 379d8f13baSMimi Zohar break; 389d8f13baSMimi Zohar } 399d8f13baSMimi Zohar return err; 409d8f13baSMimi Zohar } 419d8f13baSMimi Zohar 429d8f13baSMimi Zohar /* ---- Initial Security Label(s) Attachment ----------- */ 432a7dba39SEric Paris int jffs2_init_security(struct inode *inode, struct inode *dir, 442a7dba39SEric Paris const struct qstr *qstr) 45aa98d7cfSKaiGai Kohei { 469d8f13baSMimi Zohar return security_inode_init_security(inode, dir, qstr, 479d8f13baSMimi Zohar &jffs2_initxattrs, NULL); 48aa98d7cfSKaiGai Kohei } 49aa98d7cfSKaiGai Kohei 50aa98d7cfSKaiGai Kohei /* ---- XATTR Handler for "security.*" ----------------- */ 51d9a82a04SAndreas Gruenbacher static int jffs2_security_getxattr(const struct xattr_handler *handler, 52d9a82a04SAndreas Gruenbacher struct dentry *dentry, const char *name, 53d9a82a04SAndreas Gruenbacher void *buffer, size_t size) 54aa98d7cfSKaiGai Kohei { 55aa98d7cfSKaiGai Kohei if (!strcmp(name, "")) 56aa98d7cfSKaiGai Kohei return -EINVAL; 57aa98d7cfSKaiGai Kohei 582b0143b5SDavid Howells return do_jffs2_getxattr(d_inode(dentry), JFFS2_XPREFIX_SECURITY, 59431547b3SChristoph Hellwig name, buffer, size); 60aa98d7cfSKaiGai Kohei } 61aa98d7cfSKaiGai Kohei 62d9a82a04SAndreas Gruenbacher static int jffs2_security_setxattr(const struct xattr_handler *handler, 63d9a82a04SAndreas Gruenbacher struct dentry *dentry, const char *name, 64d9a82a04SAndreas Gruenbacher const void *buffer, size_t size, int flags) 65aa98d7cfSKaiGai Kohei { 66aa98d7cfSKaiGai Kohei if (!strcmp(name, "")) 67aa98d7cfSKaiGai Kohei return -EINVAL; 68aa98d7cfSKaiGai Kohei 692b0143b5SDavid Howells return do_jffs2_setxattr(d_inode(dentry), JFFS2_XPREFIX_SECURITY, 70431547b3SChristoph Hellwig name, buffer, size, flags); 71aa98d7cfSKaiGai Kohei } 72aa98d7cfSKaiGai Kohei 73d9a82a04SAndreas Gruenbacher static size_t jffs2_security_listxattr(const struct xattr_handler *handler, 74d9a82a04SAndreas Gruenbacher struct dentry *dentry, char *list, 75d9a82a04SAndreas Gruenbacher size_t list_size, const char *name, 76d9a82a04SAndreas Gruenbacher size_t name_len) 77aa98d7cfSKaiGai Kohei { 78aa98d7cfSKaiGai Kohei size_t retlen = XATTR_SECURITY_PREFIX_LEN + name_len + 1; 79aa98d7cfSKaiGai Kohei 80aa98d7cfSKaiGai Kohei if (list && retlen <= list_size) { 81aa98d7cfSKaiGai Kohei strcpy(list, XATTR_SECURITY_PREFIX); 82aa98d7cfSKaiGai Kohei strcpy(list + XATTR_SECURITY_PREFIX_LEN, name); 83aa98d7cfSKaiGai Kohei } 84aa98d7cfSKaiGai Kohei 85aa98d7cfSKaiGai Kohei return retlen; 86aa98d7cfSKaiGai Kohei } 87aa98d7cfSKaiGai Kohei 88365f0cb9SStephen Hemminger const struct xattr_handler jffs2_security_xattr_handler = { 89aa98d7cfSKaiGai Kohei .prefix = XATTR_SECURITY_PREFIX, 90aa98d7cfSKaiGai Kohei .list = jffs2_security_listxattr, 91aa98d7cfSKaiGai Kohei .set = jffs2_security_setxattr, 92aa98d7cfSKaiGai Kohei .get = jffs2_security_getxattr 93aa98d7cfSKaiGai Kohei }; 94