linux-kernel - [PATCH V2 2/3] audit: bail ASAP on syscall entry

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Date:   Fri,  9 Feb 2018 21:40:31 -0500
From:   Richard Guy Briggs <rgb@...hat.com>
To:     Linux-Audit Mailing List <linux-audit@...hat.com>,
        LKML <linux-kernel@...r.kernel.org>
Cc:     Paul Moore <paul@...l-moore.com>, Eric Paris <eparis@...hat.com>,
        Steve Grubb <sgrubb@...hat.com>,
        Richard Guy Briggs <rgb@...hat.com>
Subject: [PATCH V2 2/3] audit: bail ASAP on syscall entry

Since removing the audit entry filter, test for early return before
setting up any context state.

Signed-off-by: Richard Guy Briggs <rgb@...hat.com>
---
 kernel/auditsc.c | 18 +++++++++---------
 1 file changed, 9 insertions(+), 9 deletions(-)

diff --git a/kernel/auditsc.c b/kernel/auditsc.c
index 9348302..bc534bf 100644
--- a/kernel/auditsc.c
+++ b/kernel/auditsc.c
@@ -1519,23 +1519,23 @@ void __audit_syscall_entry(int major, unsigned long a1, unsigned long a2,
 	if (!audit_enabled)
 		return;
 
-	context->arch	    = syscall_get_arch();
-	context->major      = major;
-	context->argv[0]    = a1;
-	context->argv[1]    = a2;
-	context->argv[2]    = a3;
-	context->argv[3]    = a4;
-
 	state = context->state;
+	if (state == AUDIT_DISABLED)
+		return;
+
 	context->dummy = !audit_n_rules;
 	if (!context->dummy && state == AUDIT_BUILD_CONTEXT) {
 		context->prio = 0;
 		if (auditd_test_task(tsk))
 			return;
 	}
-	if (state == AUDIT_DISABLED)
-		return;
 
+	context->arch	    = syscall_get_arch();
+	context->major      = major;
+	context->argv[0]    = a1;
+	context->argv[1]    = a2;
+	context->argv[2]    = a3;
+	context->argv[3]    = a4;
 	context->serial     = 0;
 	context->ctime = current_kernel_time64();
 	context->in_syscall = 1;
-- 
1.8.3.1