linux-kernel - [PATCH AUTOSEL 5.4 034/175] lockdown: Allow unprivileged users to see lockdown status

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Message-Id: <20200608231848.3366970-34-sashal@kernel.org>
Date:   Mon,  8 Jun 2020 19:16:27 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Jeremy Cline <jcline@...hat.com>,
        "Frank Ch . Eigler" <fche@...hat.com>,
        James Morris <jmorris@...ei.org>,
        Sasha Levin <sashal@...nel.org>,
        linux-security-module@...r.kernel.org
Subject: [PATCH AUTOSEL 5.4 034/175] lockdown: Allow unprivileged users to see lockdown status

From: Jeremy Cline <jcline@...hat.com>

[ Upstream commit 60cf7c5ed5f7087c4de87a7676b8c82d96fd166c ]

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>
Signed-off-by: James Morris <jmorris@...ei.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 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 40b790536def..ae594c0a127f 100644
--- a/security/lockdown/lockdown.c
+++ b/security/lockdown/lockdown.c
@@ -175,7 +175,7 @@ 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);
 }
-- 
2.25.1