linux-kernel - Re: [PATCH v2] sched/deadline: Use proc_douintvec

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <2a55de85-13fd-f501-b942-37bd2df2c616@redhat.com>
Date:   Wed, 8 Jun 2022 14:01:50 +0200
From:   Daniel Bristot de Oliveira <bristot@...hat.com>
To:     Yajun Deng <yajun.deng@...ux.dev>, mingo@...hat.com,
        peterz@...radead.org, juri.lelli@...hat.com,
        vincent.guittot@...aro.org, dietmar.eggemann@....com,
        rostedt@...dmis.org, bsegall@...gle.com, mgorman@...e.de,
        vschneid@...hat.com
Cc:     linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] sched/deadline: Use proc_douintvec_minmax() limit
 minimum value

On 6/7/22 12:18, Yajun Deng wrote:
> sysctl_sched_dl_period_max and sysctl_sched_dl_period_min are unsigned
> integer, but proc_dointvec() wouldn't return error even if we set a
> negative number.
> 
> Use proc_douintvec_minmax() instead of proc_dointvec(). Add extra1 for
> sysctl_sched_dl_period_max and extra2 for sysctl_sched_dl_period_min.
> 
> It's just an optimization for match data and proc_handler in struct
> ctl_table. The 'if (period < min || period > max)' in __checkparam_dl()
> will work fine even if there hasn't this patch.
> 
> v2:
>  - update the log message.
> 
> Signed-off-by: Yajun Deng <yajun.deng@...ux.dev>

Reviewed-by: Daniel Bristot de Oliveira <bristot@...nel.org>
-- Daniel