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Diffstat (limited to 'fs/jffs2/security.c')
-rw-r--r--fs/jffs2/security.c82
1 files changed, 82 insertions, 0 deletions
diff --git a/fs/jffs2/security.c b/fs/jffs2/security.c
new file mode 100644
index 000000000000..4b6c3b22524f
--- /dev/null
+++ b/fs/jffs2/security.c
@@ -0,0 +1,82 @@
+/*-------------------------------------------------------------------------*
+ * File: fs/jffs2/security.c
+ * Security Labels support on JFFS2 FileSystem
+ *
+ * Implemented by KaiGai Kohei <kaigai@ak.jp.nec.com>
+ * Copyright (C) 2006 NEC Corporation
+ *
+ * For licensing information, see the file 'LICENCE' in the jffs2 directory.
+ *-------------------------------------------------------------------------*/
+
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/fs.h>
+#include <linux/time.h>
+#include <linux/pagemap.h>
+#include <linux/highmem.h>
+#include <linux/crc32.h>
+#include <linux/jffs2.h>
+#include <linux/xattr.h>
+#include <linux/mtd/mtd.h>
+#include <linux/security.h>
+#include "nodelist.h"
+
+/* ---- Initial Security Label Attachment -------------- */
+int jffs2_init_security(struct inode *inode, struct inode *dir)
+{
+ int rc;
+ size_t len;
+ void *value;
+ char *name;
+
+ rc = security_inode_init_security(inode, dir, &name, &value, &len);
+ if (rc) {
+ if (rc == -EOPNOTSUPP)
+ return 0;
+ return rc;
+ }
+ rc = do_jffs2_setxattr(inode, JFFS2_XPREFIX_SECURITY, name, value, len, 0);
+
+ kfree(name);
+ kfree(value);
+ return rc;
+}
+
+/* ---- XATTR Handler for "security.*" ----------------- */
+static int jffs2_security_getxattr(struct inode *inode, const char *name,
+ void *buffer, size_t size)
+{
+ if (!strcmp(name, ""))
+ return -EINVAL;
+
+ return do_jffs2_getxattr(inode, JFFS2_XPREFIX_SECURITY, name, buffer, size);
+}
+
+static int jffs2_security_setxattr(struct inode *inode, const char *name, const void *buffer,
+ size_t size, int flags)
+{
+ if (!strcmp(name, ""))
+ return -EINVAL;
+
+ return do_jffs2_setxattr(inode, JFFS2_XPREFIX_SECURITY, name, buffer, size, flags);
+}
+
+static size_t jffs2_security_listxattr(struct inode *inode, char *list, size_t list_size,
+ const char *name, size_t name_len)
+{
+ size_t retlen = XATTR_SECURITY_PREFIX_LEN + name_len + 1;
+
+ if (list && retlen <= list_size) {
+ strcpy(list, XATTR_SECURITY_PREFIX);
+ strcpy(list + XATTR_SECURITY_PREFIX_LEN, name);
+ }
+
+ return retlen;
+}
+
+struct xattr_handler jffs2_security_xattr_handler = {
+ .prefix = XATTR_SECURITY_PREFIX,
+ .list = jffs2_security_listxattr,
+ .set = jffs2_security_setxattr,
+ .get = jffs2_security_getxattr
+};