linux-kernel - Re: [PATCH] rlimits: do not grab tasklist_lock for do

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Date:   Wed, 5 Jan 2022 16:31:05 -0500
From:   Barret Rhoden <brho@...gle.com>
To:     "Eric W. Biederman" <ebiederm@...ssion.com>
Cc:     Christian Brauner <christian.brauner@...ntu.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Alexey Gladkov <legion@...nel.org>,
        William Cohen <wcohen@...hat.com>,
        Viresh Kumar <viresh.kumar@...aro.org>,
        Alexey Dobriyan <adobriyan@...il.com>,
        Chris Hyser <chris.hyser@...cle.com>,
        Peter Collingbourne <pcc@...gle.com>,
        Xiaofeng Cao <caoxiaofeng@...ong.com>,
        David Hildenbrand <david@...hat.com>,
        Cyrill Gorcunov <gorcunov@...il.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] rlimits: do not grab tasklist_lock for do_prlimit on
 current

On 12/15/21 14:42, Eric W. Biederman wrote:
> In update_rlimit_cpu use lock_task_sighand instead of unconditionally
> grabbing sighand->siglock (because without tasklist_lock sighand might
> be NULL).

this ended up being a minor complication, since update_rlimit_cpu() 
could fail if the task was exiting, but i think i sorted it out.

i'll send out revised patchset shortly with this change, including 
making do_prlimit() static.

thanks,

barret