linux-kernel - Re: 4096 byte limit to /proc/PID/environ ?

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Message-ID: <52dd17640708210740k2f7e16ccu8b159c513d1d1589@mail.gmail.com>
Date:	Tue, 21 Aug 2007 09:40:15 -0500
From:	"Guy Streeter" <guy.streeter@...il.com>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	"James Pearson" <james-p@...ing-picture.com>,
	linux-kernel@...r.kernel.org
Subject: Re: 4096 byte limit to /proc/PID/environ ?

On 8/15/07, H. Peter Anvin <hpa@...or.com> wrote:
> Guy Streeter wrote:
> > On 6/1/06, James Pearson <james-p@...ing-picture.com> wrote:
> >> H. Peter Anvin wrote:
> >>> I think this is the wrong approach.
> >>>
> >>> Many of these should probably be converted to seq_file, but in the
> >>> particular case of environ, the right approach is to observe the fact
> >>> that reading environ is just like reading /proc/PID/mem, except:
> >>>
> >>>  a. the access restrictions are less strict, and
> >>>  b. there is a range restriction, which needs to be enforced, and
> >>>  c. there is an offset.
> >>>
> >>> Pretty much, take the guts from /proc/PID/mem and generalize it
> >>> slightly, and you have the code that can run either /proc/PID/mem or
> >>> /proc/PID/environ.
> >> The following patch is based on the /proc/PID/mem code appears to work fine.
> >>
> >
> > This thread has gone stale. The PAGE_SIZE limit still exists. Is this
> > solution acceptable?
> >
>
> Can we avoid the code duplication?
>
>

I hope you're not asking me. I don't know the proc fs code well enough
to re-write this.

--Guy
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