Message-ID: <46F1475B.5050107@zytor.com>
Date: Wed, 19 Sep 2007 08:59:23 -0700
From: "H. Peter Anvin" <hpa@zytor.com>
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To: Mikael Pettersson <mikpe@it.uu.se>
CC: james-p@moving-picture.com, linux-kernel@vger.kernel.org,
       aarapov@redhat.com, akpm@linux-foundation.org
Subject: Re: [PATCH -mm] Don't truncate /proc/PID/environ at 4096 characters
References: <200709191454.l8JEsAQO010080@harpo.it.uu.se>
In-Reply-To: <200709191454.l8JEsAQO010080@harpo.it.uu.se>
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Mikael Pettersson wrote:
> On Wed, 19 Sep 2007 14:35:29 +0100, James Pearson wrote:
>> /proc/PID/environ currently truncates at 4096 characters, patch based on 
>> the /proc/PID/mem code.
> 
> Does /proc/PID/mem even work? If I do `strace cat /proc/PID/mem > /dev/null'
> for a known good PID, the first read() from /proc/PID/mem fails with ESRCH,

Of course it does.  Address zero isn't typically mapped.

	-hpa
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