linux-kernel - Re: [PATCH] prctl: fix PR_SET_MM

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Message-ID: <20210315131911.GB13620@redhat.com>
Date:   Mon, 15 Mar 2021 14:19:12 +0100
From:   Oleg Nesterov <oleg@...hat.com>
To:     Cyrill Gorcunov <gorcunov@...il.com>
Cc:     Alexey Dobriyan <adobriyan@...il.com>, akpm@...ux-foundation.org,
        linux-kernel@...r.kernel.org, security@...nel.org
Subject: Re: [PATCH] prctl: fix PR_SET_MM_AUXV kernel stack leak

On 03/15, Cyrill Gorcunov wrote:
>
> On Mon, Mar 15, 2021 at 01:08:03PM +0100, Oleg Nesterov wrote:
>
> >
> > And why task_lock(current) ? What does it try to protect?
>
> As far as I remember this was related to reading from procfs
> at time the patch was written for first time. Looks like this
> not relevant anymore and could be dropped.

I think this was never relevant, ->alloc_lock is per-thread, not per mm.

Oleg.