[PATCH] lockdown: Allow unprivileged users to see lockdown status

From: Jeremy Cline
Date: Thu Feb 20 2020 - 10:17:58 EST

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@xxxxxxxxxx>
Signed-off-by: Jeremy Cline <jcline@xxxxxxxxxx>
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,
return PTR_ERR_OR_ZERO(dentry);