lockdown: Allow unprivileged users to see lockdown status

[ 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@redhat.com>
Signed-off-by: Jeremy Cline <jcline@redhat.com>
Signed-off-by: James Morris <jmorris@namei.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/security/lockdown/lockdown.c b/security/lockdown/lockdown.c
index 5a952617a0eba388a99345206de469b666770122..87cbdc64d272c72409bcb6f8f5e6a740ef95764a 100644 (file)
--- 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);
 }