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From 3a82f8be03b07b84fa470c6e42cd87865aeaf701 Mon Sep 17 00:00:00 2001
From: Will Woods <wwoods@redhat.com>
Date: Fri, 13 Mar 2015 17:24:46 -0400
Subject: [PATCH] selinux: fix SEGV during switch-root if SELinux policy loaded
If you've got SELinux policy loaded, label_hnd is your labeling handle.
When systemd is shutting down, we free that handle via mac_selinux_finish().
But: switch_root() calls mkdir_p_label(), which tries to look up a label
using that freed handle, and so we get a bunch of garbage and eventually
SEGV in libselinux.
(This doesn't happen in the switch-root from initramfs to real root because
there's no SELinux policy loaded in initramfs, so label_hnd is NULL and we
never attempt any lookups.)
So: make sure that mac_selinux_finish() actually sets label_hnd to NULL, so
nobody tries to use it after it becomes invalid.
https://bugzilla.redhat.com/show_bug.cgi?id=1185604
(cherry picked from commit f5ce2b49585a14cefb6d02f61c8dcdf7628a8605)
---
src/shared/selinux-util.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/src/shared/selinux-util.c b/src/shared/selinux-util.c
index a2233e0cf..a46ddf849 100644
--- a/src/shared/selinux-util.c
+++ b/src/shared/selinux-util.c
@@ -117,6 +117,7 @@ void mac_selinux_finish(void) {
return;
selabel_close(label_hnd);
+ label_hnd = NULL;
#endif
}