linux-kernel - [PATCH 3.2 110/125] netlink: rate-limit leftover bytes warning and print process name

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Message-ID: <lsq.1404846110.982764840@decadent.org.uk>
Date:	Tue, 08 Jul 2014 20:01:50 +0100
From:	Ben Hutchings <ben@...adent.org.uk>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:	akpm@...ux-foundation.org, "David S. Miller" <davem@...emloft.net>,
	"Michal Schmidt" <mschmidt@...hat.com>
Subject: [PATCH 3.2 110/125] netlink: rate-limit leftover bytes warning
 and print  process name

3.2.61-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Michal Schmidt <mschmidt@...hat.com>

[ Upstream commit bfc5184b69cf9eeb286137640351c650c27f118a ]

Any process is able to send netlink messages with leftover bytes.
Make the warning rate-limited to prevent too much log spam.

The warning is supposed to help find userspace bugs, so print the
triggering command name to implicate the buggy program.

[v2: Use pr_warn_ratelimited instead of printk_ratelimited.]

Signed-off-by: Michal Schmidt <mschmidt@...hat.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 lib/nlattr.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

--- a/lib/nlattr.c
+++ b/lib/nlattr.c
@@ -12,6 +12,7 @@
 #include <linux/netdevice.h>
 #include <linux/skbuff.h>
 #include <linux/string.h>
+#include <linux/ratelimit.h>
 #include <linux/types.h>
 #include <net/netlink.h>
 
@@ -197,8 +198,8 @@ int nla_parse(struct nlattr **tb, int ma
 	}
 
 	if (unlikely(rem > 0))
-		printk(KERN_WARNING "netlink: %d bytes leftover after parsing "
-		       "attributes.\n", rem);
+		pr_warn_ratelimited("netlink: %d bytes leftover after parsing attributes in process `%s'.\n",
+				    rem, current->comm);
 
 	err = 0;
 errout:

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