[PATCH v36 25/33] LSM: Add a function to report multiple LSMs

[Casey Schaufler]

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

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

diff --git a/include/linux/security.h b/include/linux/security.h
index 1efd34a8f75f..4cf551133e99 100644
--- a/include/linux/security.h
+++ b/include/linux/security.h
@@ -234,6 +234,15 @@ 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
-- 
2.35.1