linux-kernel - [PATCH] lockdown: Allow unprivileged users to see lockdown status

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Message-Id: <20200220151738.1492852-1-jcline@redhat.com>
Date:   Thu, 20 Feb 2020 10:17:38 -0500
From:   Jeremy Cline <jcline@...hat.com>
To:     James Morris <jmorris@...ei.org>,
        "Serge E . Hallyn" <serge@...lyn.com>
Cc:     Matthew Garrett <matthewgarrett@...gle.com>,
        David Howells <dhowells@...hat.com>,
        linux-security-module@...r.kernel.org,
        linux-kernel@...r.kernel.org, Jeremy Cline <jcline@...hat.com>,
        "Frank Ch . Eigler" <fche@...hat.com>
Subject: [PATCH] lockdown: Allow unprivileged users to see lockdown status

A number of userspace tools, such as systemtap, need a way to see the
current lockdown state so they can gracefully deal with the kernel being
locked down. The state is already exposed in
/sys/kernel/security/lockdown, but is only readable by root. Adjust the
permissions so unprivileged users can read the state.

Fixes: 000d388ed3bb ("security: Add a static lockdown policy LSM")
Cc: Frank Ch. Eigler <fche@...hat.com>
Signed-off-by: Jeremy Cline <jcline@...hat.com>
---
 security/lockdown/lockdown.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/security/lockdown/lockdown.c b/security/lockdown/lockdown.c
index 5a952617a0eb..87cbdc64d272 100644
--- a/security/lockdown/lockdown.c
+++ b/security/lockdown/lockdown.c
@@ -150,7 +150,7 @@ static int __init lockdown_secfs_init(void)
 {
 	struct dentry *dentry;
 
-	dentry = securityfs_create_file("lockdown", 0600, NULL, NULL,
+	dentry = securityfs_create_file("lockdown", 0644, NULL, NULL,
 					&lockdown_ops);
 	return PTR_ERR_OR_ZERO(dentry);
 }
-- 
2.24.1