linux-kernel - Re: brk checks in PR_SET

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Message-ID: <20201217074202.GD14556@grain>
Date:   Thu, 17 Dec 2020 10:42:02 +0300
From:   Cyrill Gorcunov <gorcunov@...il.com>
To:     Keno Fischer <keno@...iacomputing.com>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Andrew Morton <akpm@...ux-foundation.org>, mkoutny@...e.com,
        ktkhai@...tuozzo.com
Subject: Re: brk checks in PR_SET_MM code

On Wed, Dec 16, 2020 at 08:29:30PM -0500, Keno Fischer wrote:
> Hi all,
> 
> The code in prctl(PR_SET_MM, ...) performs a number of sanity checks,
> among them
> 
> ```
> /*
>  * @brk should be after @end_data in traditional maps.
>  */
> if (prctl_map->start_brk <= prctl_map->end_data ||
>     prctl_map->brk <= prctl_map->end_data)
> goto out;
> ```
> 

Thanks for pointing, Keno! I don't remember the details right now,
gimme some time and once I refresh my memory I'll reply with
details.