[RESEND] lockdown: Allow unprivileged users to see lockdown status
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Message ID 20200514140546.826698-1-jcline@redhat.com
State New
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  • [RESEND] lockdown: Allow unprivileged users to see lockdown status
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Commit Message

Jeremy Cline May 14, 2020, 2:05 p.m. UTC
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>
---
 security/lockdown/lockdown.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Comments

James Morris May 14, 2020, 5:28 p.m. UTC | #1
On Thu, 14 May 2020, Jeremy Cline wrote:

> 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>

Applied to
git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/linux-security.git next-general

Patch
diff mbox series

diff --git a/security/lockdown/lockdown.c b/security/lockdown/lockdown.c
index 5a952617a0eba..87cbdc64d272c 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);
 }