linux-kernel - [PATCH AUTOSEL for 4.4 20/20] audit: ensure that 'audit=1' actually enables audit for PID 1

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Date:   Sat, 2 Dec 2017 15:53:02 +0000
From:   alexander.levin@...izon.com
To:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>
Cc:     Paul Moore <paul@...l-moore.com>, alexander.levin@...izon.com
Subject: [PATCH AUTOSEL for 4.4 20/20] audit: ensure that 'audit=1' actually
 enables audit for PID 1

From: Paul Moore <paul@...l-moore.com>

[ Upstream commit 173743dd99a49c956b124a74c8aacb0384739a4c ]

Prior to this patch we enabled audit in audit_init(), which is too
late for PID 1 as the standard initcalls are run after the PID 1 task
is forked.  This means that we never allocate an audit_context (see
audit_alloc()) for PID 1 and therefore miss a lot of audit events
generated by PID 1.

This patch enables audit as early as possible to help ensure that when
PID 1 is forked it can allocate an audit_context if required.

Reviewed-by: Richard Guy Briggs <rgb@...hat.com>
Signed-off-by: Paul Moore <paul@...l-moore.com>
Signed-off-by: Sasha Levin <alexander.levin@...izon.com>
---
 kernel/audit.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/kernel/audit.c b/kernel/audit.c
index 5ffcbd354a52..41f9a38bb800 100644
--- a/kernel/audit.c
+++ b/kernel/audit.c
@@ -80,13 +80,13 @@ static int	audit_initialized;
 #define AUDIT_OFF	0
 #define AUDIT_ON	1
 #define AUDIT_LOCKED	2
-u32		audit_enabled;
-u32		audit_ever_enabled;
+u32		audit_enabled = AUDIT_OFF;
+u32		audit_ever_enabled = !!AUDIT_OFF;
 
 EXPORT_SYMBOL_GPL(audit_enabled);
 
 /* Default state when kernel boots without any parameters. */
-static u32	audit_default;
+static u32	audit_default = AUDIT_OFF;
 
 /* If auditing cannot proceed, audit_failure selects what happens. */
 static u32	audit_failure = AUDIT_FAIL_PRINTK;
@@ -1179,8 +1179,6 @@ static int __init audit_init(void)
 	skb_queue_head_init(&audit_skb_queue);
 	skb_queue_head_init(&audit_skb_hold_queue);
 	audit_initialized = AUDIT_INITIALIZED;
-	audit_enabled = audit_default;
-	audit_ever_enabled |= !!audit_default;
 
 	audit_log(NULL, GFP_KERNEL, AUDIT_KERNEL, "initialized");
 
@@ -1197,6 +1195,8 @@ static int __init audit_enable(char *str)
 	audit_default = !!simple_strtol(str, NULL, 0);
 	if (!audit_default)
 		audit_initialized = AUDIT_DISABLED;
+	audit_enabled = audit_default;
+	audit_ever_enabled = !!audit_enabled;
 
 	pr_info("%s\n", audit_default ?
 		"enabled (after initialization)" : "disabled (until reboot)");
-- 
2.11.0