linux-kernel - Re: [BUG] timer_migration interface accepts any number as input in 2.6.30-git9

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Date:	Wed, 17 Jun 2009 15:51:26 +0530
From:	Arun R Bharadwaj <arun@...ux.vnet.ibm.com>
To:	poornima nayak <mpnayak@...ux.vnet.ibm.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [BUG] timer_migration interface accepts any number as input in
	2.6.30-git9

* poornima nayak <mpnayak@...ux.vnet.ibm.com> [2009-06-17 14:42:16]:

> Hi
> 
> Timer migration interface /proc/sys/kernel/timer_migration in
> 2.6.30-git9 accepts any numerical value as input.
> Steps to reproduce 
> 1. echo -6666666 > /proc/sys/kernel/timer_migration
> 2. cat /proc/sys/kernel/timer_migration
> -6666666
> 
> 1. echo 44444444444444444444444444444444444444444444444444444444444 > /proc/sys/kernel/timer_migration
> 2. cat /proc/sys/kernel/timer_migration
> -1357789412
> 
> Expected behavior: Should 'echo: write error: Invalid argument' while
> setting any value other then 0 & 1
> 
> Regards
> Poornima
> 

Hi Poornima,

Thanks for reporting the bug.
Hope this patch removes the bug.
The patch is based against the latest -tip/master.

--arun


Signed-off-by: Arun R Bharadwaj <arun@...ux.vnet.ibm.com>
---
 kernel/sysctl.c |    5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

Index: linux.trees.git/kernel/sysctl.c
===================================================================
--- linux.trees.git.orig/kernel/sysctl.c
+++ linux.trees.git/kernel/sysctl.c
@@ -335,7 +335,10 @@ static struct ctl_table kern_table[] = {
 		.data		= &sysctl_timer_migration,
 		.maxlen		= sizeof(unsigned int),
 		.mode		= 0644,
-		.proc_handler	= &proc_dointvec,
+		.proc_handler	= &proc_dointvec_minmax,
+		.strategy	= &sysctl_intvec,
+		.extra1		= &zero,
+		.extra2		= &one,
 	},
 #endif
 	{
--
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