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

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Date:	Mon, 22 Jun 2009 16:52:08 +0530
From:	poornima nayak <mpnayak@...ux.vnet.ibm.com>
To:	arun@...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

Hi Arun, 

Patch given by you fixes the reported bug.

Regds
Poornima
On Wed, 2009-06-17 at 15:51 +0530, Arun R Bharadwaj wrote:
> * 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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