| 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 | }; |