linux-kernel - [PATCH AUTOSEL 5.7 47/58] scripts/selinux/mdp: fix initial SID handling

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Date:   Sat,  8 Aug 2020 19:37:13 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Stephen Smalley <stephen.smalley.work@...il.com>,
        Paul Moore <paul@...l-moore.com>,
        Sasha Levin <sashal@...nel.org>, selinux@...r.kernel.org
Subject: [PATCH AUTOSEL 5.7 47/58] scripts/selinux/mdp: fix initial SID handling

From: Stephen Smalley <stephen.smalley.work@...il.com>

[ Upstream commit 382c2b5d23b4245f1818f69286db334355488dc4 ]

commit e3e0b582c321 ("selinux: remove unused initial SIDs and improve
handling") broke scripts/selinux/mdp since the unused initial SID names
were removed and the corresponding generation of policy initial SID
definitions by mdp was not updated accordingly.  Fix it.  With latest
upstream checkpolicy it is no longer necessary to include the SID context
definitions for the unused initial SIDs but retain them for compatibility
with older checkpolicy.

Fixes: e3e0b582c321 ("selinux: remove unused initial SIDs and improve handling")
Signed-off-by: Stephen Smalley <stephen.smalley.work@...il.com>
Signed-off-by: Paul Moore <paul@...l-moore.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 scripts/selinux/mdp/mdp.c | 23 ++++++++++++++++++-----
 1 file changed, 18 insertions(+), 5 deletions(-)

diff --git a/scripts/selinux/mdp/mdp.c b/scripts/selinux/mdp/mdp.c
index 576d11a60417b..6ceb88eb9b590 100644
--- a/scripts/selinux/mdp/mdp.c
+++ b/scripts/selinux/mdp/mdp.c
@@ -67,8 +67,14 @@ int main(int argc, char *argv[])
 
 	initial_sid_to_string_len = sizeof(initial_sid_to_string) / sizeof (char *);
 	/* print out the sids */
-	for (i = 1; i < initial_sid_to_string_len; i++)
-		fprintf(fout, "sid %s\n", initial_sid_to_string[i]);
+	for (i = 1; i < initial_sid_to_string_len; i++) {
+		const char *name = initial_sid_to_string[i];
+
+		if (name)
+			fprintf(fout, "sid %s\n", name);
+		else
+			fprintf(fout, "sid unused%d\n", i);
+	}
 	fprintf(fout, "\n");
 
 	/* print out the class permissions */
@@ -126,9 +132,16 @@ int main(int argc, char *argv[])
 #define OBJUSERROLETYPE "user_u:object_r:base_t"
 
 	/* default sids */
-	for (i = 1; i < initial_sid_to_string_len; i++)
-		fprintf(fout, "sid %s " SUBJUSERROLETYPE "%s\n",
-			initial_sid_to_string[i], mls ? ":" SYSTEMLOW : "");
+	for (i = 1; i < initial_sid_to_string_len; i++) {
+		const char *name = initial_sid_to_string[i];
+
+		if (name)
+			fprintf(fout, "sid %s ", name);
+		else
+			fprintf(fout, "sid unused%d\n", i);
+		fprintf(fout, SUBJUSERROLETYPE "%s\n",
+			mls ? ":" SYSTEMLOW : "");
+	}
 	fprintf(fout, "\n");
 
 #define FS_USE(behavior, fstype)			    \
-- 
2.25.1