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-rw-r--r--fs/ext2/xattr_security.c53
1 files changed, 53 insertions, 0 deletions
diff --git a/fs/ext2/xattr_security.c b/fs/ext2/xattr_security.c
new file mode 100644
index 0000000..6a6c59f
--- /dev/null
+++ b/fs/ext2/xattr_security.c
@@ -0,0 +1,53 @@
+/*
+ * linux/fs/ext2/xattr_security.c
+ * Handler for storing security labels as extended attributes.
+ */
+
+#include <linux/module.h>
+#include <linux/string.h>
+#include <linux/fs.h>
+#include <linux/smp_lock.h>
+#include <linux/ext2_fs.h>
+#include "xattr.h"
+
+static size_t
+ext2_xattr_security_list(struct inode *inode, char *list, size_t list_size,
+ const char *name, size_t name_len)
+{
+ const int prefix_len = sizeof(XATTR_SECURITY_PREFIX)-1;
+ const size_t total_len = prefix_len + name_len + 1;
+
+ if (list && total_len <= list_size) {
+ memcpy(list, XATTR_SECURITY_PREFIX, prefix_len);
+ memcpy(list+prefix_len, name, name_len);
+ list[prefix_len + name_len] = '\0';
+ }
+ return total_len;
+}
+
+static int
+ext2_xattr_security_get(struct inode *inode, const char *name,
+ void *buffer, size_t size)
+{
+ if (strcmp(name, "") == 0)
+ return -EINVAL;
+ return ext2_xattr_get(inode, EXT2_XATTR_INDEX_SECURITY, name,
+ buffer, size);
+}
+
+static int
+ext2_xattr_security_set(struct inode *inode, const char *name,
+ const void *value, size_t size, int flags)
+{
+ if (strcmp(name, "") == 0)
+ return -EINVAL;
+ return ext2_xattr_set(inode, EXT2_XATTR_INDEX_SECURITY, name,
+ value, size, flags);
+}
+
+struct xattr_handler ext2_xattr_security_handler = {
+ .prefix = XATTR_SECURITY_PREFIX,
+ .list = ext2_xattr_security_list,
+ .get = ext2_xattr_security_get,
+ .set = ext2_xattr_security_set,
+};
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