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 16:11:09 +0530
From:	Jaswinder Singh Rajput <jaswinder@...nel.org>
To:	poornima nayak <mpnayak@...ux.vnet.ibm.com>
Cc:	linux-kernel@...r.kernel.org, arun@...ux.vnet.ibm.com,
	Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	x86 maintainers <x86@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [BUG] timer_migration interface accepts any number as input in
 2.6.30-git9

On Wed, 2009-06-17 at 14:42 +0530, poornima nayak wrote:
> 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
> 

Is this patch fix your problem:

[PATCH] kernel/sysctl: fix timer migration interface

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

Reported-by: Poornima Nayak <mpnayak@...ux.vnet.ibm.com>
Signed-off-by: Jaswinder Singh Rajput <jaswinderrajput@...il.com>
---
 kernel/sysctl.c |    5 ++++-
 1 files changed, 4 insertions(+), 1 deletions(-)

diff --git a/kernel/sysctl.c b/kernel/sysctl.c
index ac57832..d0f65e4 100644
--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -334,7 +334,10 @@ 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
 	{
-- 
1.6.0.6




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