From 1e7d8bcbe37d3c63babe628443f13f77970dd06b Mon Sep 17 00:00:00 2001 From: Nathan Lynch Date: Thu, 8 Sep 2022 17:02:22 -0500 Subject: lockdown: ratelimit denial messages User space can flood the log with lockdown denial messages: [ 662.555584] Lockdown: bash: debugfs access is restricted; see man kernel_lockdown.7 [ 662.563237] Lockdown: bash: debugfs access is restricted; see man kernel_lockdown.7 [ 662.571134] Lockdown: bash: debugfs access is restricted; see man kernel_lockdown.7 [ 662.578668] Lockdown: bash: debugfs access is restricted; see man kernel_lockdown.7 [ 662.586021] Lockdown: bash: debugfs access is restricted; see man kernel_lockdown.7 [ 662.593398] Lockdown: bash: debugfs access is restricted; see man kernel_lockdown.7 Ratelimiting these shouldn't meaningfully degrade the quality of the information logged. Signed-off-by: Nathan Lynch Signed-off-by: Paul Moore --- security/lockdown/lockdown.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'security/lockdown') diff --git a/security/lockdown/lockdown.c b/security/lockdown/lockdown.c index 87cbdc64d272..a79b985e917e 100644 --- a/security/lockdown/lockdown.c +++ b/security/lockdown/lockdown.c @@ -63,7 +63,7 @@ static int lockdown_is_locked_down(enum lockdown_reason what) if (kernel_locked_down >= what) { if (lockdown_reasons[what]) - pr_notice("Lockdown: %s: %s is restricted; see man kernel_lockdown.7\n", + pr_notice_ratelimited("Lockdown: %s: %s is restricted; see man kernel_lockdown.7\n", current->comm, lockdown_reasons[what]); return -EPERM; } -- cgit v1.2.3