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-rw-r--r--security/landlock/cred.c46
1 files changed, 46 insertions, 0 deletions
diff --git a/security/landlock/cred.c b/security/landlock/cred.c
new file mode 100644
index 000000000000..6725af24c684
--- /dev/null
+++ b/security/landlock/cred.c
@@ -0,0 +1,46 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Landlock LSM - Credential hooks
+ *
+ * Copyright © 2017-2020 Mickaël Salaün <mic@digikod.net>
+ * Copyright © 2018-2020 ANSSI
+ */
+
+#include <linux/cred.h>
+#include <linux/lsm_hooks.h>
+
+#include "common.h"
+#include "cred.h"
+#include "ruleset.h"
+#include "setup.h"
+
+static int hook_cred_prepare(struct cred *const new,
+ const struct cred *const old, const gfp_t gfp)
+{
+ struct landlock_ruleset *const old_dom = landlock_cred(old)->domain;
+
+ if (old_dom) {
+ landlock_get_ruleset(old_dom);
+ landlock_cred(new)->domain = old_dom;
+ }
+ return 0;
+}
+
+static void hook_cred_free(struct cred *const cred)
+{
+ struct landlock_ruleset *const dom = landlock_cred(cred)->domain;
+
+ if (dom)
+ landlock_put_ruleset_deferred(dom);
+}
+
+static struct security_hook_list landlock_hooks[] __lsm_ro_after_init = {
+ LSM_HOOK_INIT(cred_prepare, hook_cred_prepare),
+ LSM_HOOK_INIT(cred_free, hook_cred_free),
+};
+
+__init void landlock_add_cred_hooks(void)
+{
+ security_add_hooks(landlock_hooks, ARRAY_SIZE(landlock_hooks),
+ LANDLOCK_NAME);
+}