linux-kernel - Re: [oss-security] [patch] proc.5: tell how to parse /proc/*/stat correctly

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Date:   Wed, 28 Dec 2022 01:50:03 -0000 (UTC)
From:   Tavis Ormandy <taviso@...il.com>
To:     linux-kernel@...r.kernel.org
Cc:     oss-security@...ts.openwall.com, linux-man@...r.kernel.org
Subject: Re: [oss-security] [patch] proc.5: tell how to parse /proc/*/stat
 correctly

On 2022-12-28, Lyndon Nerenberg (VE7TFX/VE6BBM) wrote:
> Dominique Martinet writes:
>
>> But, really, I just don't see how this can practically be said to be parsable...
>
> In its current form it never will be.  The solution is to place
> this variable-length field last.  Then you can "cut -d ' ' -f 51-"
> to get the command+args part (assuming I counted all those fields
> correctly ...)
>
> Of course, this breaks backwards compatability.
>

I think that cut command doesn't handle newlines, you probably need cut
-z, which looks a bit hacky to me. There already is 'ps -q $$ -o comm=',
of course, and that works fine - as well as libprocps.

I don't know, I think just adding the strrchr note seems acceptable.

Tavis.


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