[PATCH 34/97] NET: Remove scaffolding on secmarks

[Casey Schaufler]

Replace the lsm_export scaffolding in xt_SECMARK.c
This raises an issue, in that Smack users have been
using SECMARK_MODE_SEL, which is suppoed to be exclusively
for SELinux. This is worked around in the code, but not
fully addressed.

Signed-off-by: Casey Schaufler <casey at schaufler-ca.com>
---
 net/netfilter/xt_SECMARK.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/net/netfilter/xt_SECMARK.c b/net/netfilter/xt_SECMARK.c
index 2def8d8898e6..9a2a97c200a2 100644
--- a/net/netfilter/xt_SECMARK.c
+++ b/net/netfilter/xt_SECMARK.c
@@ -55,6 +55,7 @@ static int checkentry_lsm(struct xt_secmark_target_info *info)
 	info->secctx[SECMARK_SECCTX_MAX - 1] = '\0';
 	info->secid = 0;
 
+	lsm_export_init(&le);
 	err = security_secctx_to_secid(info->secctx, strlen(info->secctx), &le);
 	if (err) {
 		if (err == -EINVAL)
@@ -63,7 +64,12 @@ static int checkentry_lsm(struct xt_secmark_target_info *info)
 		return err;
 	}
 
-	lsm_export_secid(&le, &info->secid);
+	/* Smack is cheating, using SECMARK_MODE_SEL */
+	if (le.selinux)
+		info->secid = le.selinux;
+	else
+		info->secid = le.smack;
+
 	if (!info->secid) {
 		pr_info_ratelimited("unable to map security context \'%s\'\n",
 				    info->secctx);
-- 
2.17.0