From: Stephen Smalley <sds@tycho.nsa.gov>
Date: Wed, 9 Nov 2005 05:34:32 +0000 (-0800)
Subject: [PATCH] selinux: MLS compatibility
X-Git-Tag: firefly_0821_release~40516
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=e517a0cd859ae0c4d9451107113fc2b076456f8f;p=firefly-linux-kernel-4.4.55.git

[PATCH] selinux: MLS compatibility

This patch enables files created on a MLS-enabled SELinux system to be
accessible on a non-MLS SELinux system, by skipping the MLS component of
the security context in the non-MLS case.

Signed-off-by:  Stephen Smalley <sds@tycho.nsa.gov>
Signed-off-by:  James Morris <jmorris@namei.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
---

diff --git a/security/selinux/ss/mls.c b/security/selinux/ss/mls.c
index aaefac2921f1..640d0bfdbc68 100644
--- a/security/selinux/ss/mls.c
+++ b/security/selinux/ss/mls.c
@@ -262,8 +262,11 @@ int mls_context_to_sid(char oldc,
 	struct cat_datum *catdatum, *rngdatum;
 	int l, rc = -EINVAL;
 
-	if (!selinux_mls_enabled)
+	if (!selinux_mls_enabled) {
+		if (def_sid != SECSID_NULL && oldc)
+			*scontext += strlen(*scontext);
 		return 0;
+	}
 
 	/*
 	 * No MLS component to the security context, try and map to