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From:   Casey Schaufler <casey@schaufler-ca.com>
To:     casey.schaufler@intel.com, jmorris@namei.org,
        linux-security-module@vger.kernel.org, selinux@vger.kernel.org
Cc:     casey@schaufler-ca.com, linux-audit@redhat.com,
        keescook@chromium.org, john.johansen@canonical.com,
        penguin-kernel@i-love.sakura.ne.jp, paul@paul-moore.com,
        stephen.smalley.work@gmail.com, linux-kernel@vger.kernel.org
Subject: [PATCH v33 24/29] LSM: Add a function to report multiple LSMs
Date:   Thu, 10 Mar 2022 15:46:27 -0800
Message-Id: <20220310234632.16194-25-casey@schaufler-ca.com>
In-Reply-To: <20220310234632.16194-1-casey@schaufler-ca.com>
References: <20220310234632.16194-1-casey@schaufler-ca.com>
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Add a new boolean function lsm_multiple_contexts() to
identify when multiple security modules provide security
context strings.

Signed-off-by: Casey Schaufler <casey@schaufler-ca.com>
---
 include/linux/security.h | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/include/linux/security.h b/include/linux/security.h
index 6dbdfd12fd79..13bc38970498 100644
--- a/include/linux/security.h
+++ b/include/linux/security.h
@@ -232,6 +232,15 @@ static inline bool lsmblob_equal(const struct lsmblob *bloba,
 extern int lsm_name_to_slot(char *name);
 extern const char *lsm_slot_to_name(int slot);
 
+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
-- 
2.31.1