Re: [PATCH v2] sched: check user input value of sysctl_sched_time_avg

[Ethan Zhao <ethan.zhao@oracle.com>]

Peter,


On 2017/9/4 15:49, Peter Zijlstra wrote:
> On Sat, Sep 02, 2017 at 02:57:32PM +0800, Ethan Zhao wrote:
>> diff --git a/kernel/sysctl.c b/kernel/sysctl.c
>> index 6648fbb..609bed2 100644
>> --- a/kernel/sysctl.c
>> +++ b/kernel/sysctl.c
>> @@ -367,7 +367,7 @@ static int sysrq_sysctl_handler(struct ctl_table *table, int write,
>>   		.data		= &sysctl_sched_time_avg,
>>   		.maxlen		= sizeof(unsigned int),
>>   		.mode		= 0644,
>> -		.proc_handler	= proc_dointvec,
>> +		.proc_handler	= sched_time_avg_handler,
> *sigh*, what's wrong with the below? Too easy?
  :),  seems I walked zigzag several cycles to get the right point.

  Thanks,
  Ethan
>
> diff --git a/kernel/sysctl.c b/kernel/sysctl.c
> index 6648fbbb8157..bbbc6a17c15e 100644
> --- a/kernel/sysctl.c
> +++ b/kernel/sysctl.c
> @@ -367,7 +367,8 @@ static struct ctl_table kern_table[] = {
>   		.data		= &sysctl_sched_time_avg,
>   		.maxlen		= sizeof(unsigned int),
>   		.mode		= 0644,
> -		.proc_handler	= proc_dointvec,
> +		.proc_handler	= proc_dointvec_min_max,
> +		.extra1		= &one,
>   	},
>   #ifdef CONFIG_SCHEDSTATS
>   	{
>
>