linux-kernel - [PATCH v37 25/33] LSM: Add a function to report multiple LSMs

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Date:   Mon, 27 Jun 2022 17:56:03 -0700
From:   Casey Schaufler <casey@...aufler-ca.com>
To:     casey.schaufler@...el.com, jmorris@...ei.org,
        linux-security-module@...r.kernel.org, selinux@...r.kernel.org
Cc:     casey@...aufler-ca.com, linux-audit@...hat.com,
        keescook@...omium.org, john.johansen@...onical.com,
        penguin-kernel@...ove.sakura.ne.jp, paul@...l-moore.com,
        stephen.smalley.work@...il.com, linux-kernel@...r.kernel.org
Subject: [PATCH v37 25/33] LSM: Add a function to report multiple LSMs

Add a new boolean function lsm_multiple_contexts() to
identify when multiple security modules provide security
context strings.

Signed-off-by: Casey Schaufler <casey@...aufler-ca.com>
Acked-by: Paul Moore <paul@...l-moore.com>
Reviewed-by: John Johansen <john.johansen@...onical.com>
---
 include/linux/security.h | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/include/linux/security.h b/include/linux/security.h
index 5ebc3ec6948c..890a5f9f043c 100644
--- a/include/linux/security.h
+++ b/include/linux/security.h
@@ -245,6 +245,15 @@ static inline const char *lsm_slot_to_name(int slot)
 }
 #endif
 
+static inline bool lsm_multiple_contexts(void)
+{
+#ifdef CONFIG_SECURITY
+	return lsm_slot_to_name(1) != NULL;
+#else
+	return false;
+#endif
+}
+
 /**
  * lsmblob_value - find the first non-zero value in an lsmblob structure.
  * @blob: Pointer to the data
-- 
2.36.1