linux-kernel - Re: [PATCH 3.8-stable] sched/debug: Fix sd->*

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Message-ID: <516CAF08.1090107@huawei.com>
Date:	Tue, 16 Apr 2013 09:53:12 +0800
From:	libin <huawei.libin@...wei.com>
To:	Jonghwan Choi <jhbird.choi@...il.com>
CC:	<stable@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<jiang.liu@...wei.com>, <guohanjun@...wei.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...nel.org>,
	Jonghwan Choi <jhbird.choi@...sung.com>
Subject: Re: [PATCH 3.8-stable] sched/debug: Fix sd->*_idx limit range avoiding
 overflow

On 2013/4/15 22:15, Jonghwan Choi wrote:
> From: libin <huawei.libin@...wei.com>
> 
> This patch looks like it should be in the 3.8-stable tree, should we apply
> it?
> 

yes, I think this patch should be applied to the 3.8-stable tree. Thanks.
Libin

> ------------------
> 
> From: "libin <huawei.libin@...wei.com>"
> 
> commit fd9b86d37a600488dbd80fe60cca46b822bff1cd upstream
> 
> Commit 201c373e8e ("sched/debug: Limit sd->*_idx range on
> sysctl") was an incomplete bug fix.
> 
> This patch fixes sd->*_idx limit range to [0 ~ CPU_LOAD_IDX_MAX-1]
> avoiding array overflow caused by setting sd->*_idx to CPU_LOAD_IDX_MAX
> on sysctl.
> 
> Signed-off-by: Libin <huawei.libin@...wei.com>
> Cc: <jiang.liu@...wei.com>
> Cc: <guohanjun@...wei.com>
> Cc: Peter Zijlstra <peterz@...radead.org>
> Link: http://lkml.kernel.org/r/51626610.2040607@huawei.com
> Signed-off-by: Ingo Molnar <mingo@...nel.org>
> Signed-off-by: Jonghwan Choi <jhbird.choi@...sung.com>
> ---
>  kernel/sched/core.c |    2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/kernel/sched/core.c b/kernel/sched/core.c
> index 26058d0..112a32a 100644
> --- a/kernel/sched/core.c
> +++ b/kernel/sched/core.c
> @@ -4948,7 +4948,7 @@ static void sd_free_ctl_entry(struct ctl_table **tablep)
>  }
>  
>  static int min_load_idx = 0;
> -static int max_load_idx = CPU_LOAD_IDX_MAX;
> +static int max_load_idx = CPU_LOAD_IDX_MAX-1;
>  
>  static void
>  set_table_entry(struct ctl_table *entry,
> 


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