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Date: Sat, 1 Feb 2014 18:32:31 -0800
From: Andy Lutomirski <luto@...capital.net>
To: Oleg Nesterov <oleg@...hat.com>, Steve Grubb <sgrubb@...hat.com>,
Eric Paris <eparis@...hat.com>, linux-audit@...hat.com,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Why is syscall auditing on with no rules?
On a stock Fedora installation:
$ sudo auditctl -l
No rules
Nonetheless TIF_SYSCALL_AUDIT is set and the __audit_syscall_entry and
__audit_syscall_exit account for >20% of syscall overhead according to
perf.
This sucks. Unless I'm missing something, syscall auditing is *off*.
How hard would it be to arrange for TIF_SYSCALL_AUDIT to be cleared
when there are no syscall rules?
(This is extra bad in kernels before 3.13, where the clear call for
TIF_SYSCALL_AUDIT was completely missing.)
--Andy
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