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From: "H. Peter Anvin" <hpa@zytor.com>
To: linux-kernel@vger.kernel.org
Subject: Re: 4096 byte limit to /proc/PID/environ ?
Date: Wed, 24 May 2006 13:29:53 -0700 (PDT)	[thread overview]
Message-ID: <e52fo1$uv5$1@terminus.zytor.com> (raw)
In-Reply-To: 4474B7DB.8000304@moving-picture.com

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.

	-hpa

  reply	other threads:[~2006-05-24 20:29 UTC|newest]

Thread overview: 25+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2006-05-24 19:45 4096 byte limit to /proc/PID/environ ? James Pearson
2006-05-24 20:29 ` H. Peter Anvin [this message]
     [not found] ` <200605242029.k4OKTn9C031700@terminus.zytor.com>
2006-06-01 14:11   ` James Pearson
2007-08-15 16:54     ` Guy Streeter
2007-08-15 17:25       ` H. Peter Anvin
2007-08-21 14:40         ` Guy Streeter
2007-08-30 13:53         ` James Pearson
2007-09-03  8:17           ` Anton Arapov
2007-09-05  7:49           ` Anton Arapov
2007-09-05  7:58             ` H. Peter Anvin
2007-09-05 17:00               ` James Pearson
2007-09-05 17:18                 ` Randy Dunlap
2007-09-06  9:23                   ` James Pearson
2007-09-05 17:22                 ` Alexey Dobriyan
2007-09-06  9:31                   ` James Pearson
2007-09-06 12:31                 ` Jan Engelhardt
2007-09-06 12:34                   ` H. Peter Anvin
2007-09-06 12:34                   ` Anton Arapov
  -- strict thread matches above, loose matches on Subject: below --
2007-09-06 16:38 James Pearson
2007-09-18 14:09 ` Anton Arapov
2007-09-18 17:09   ` H. Peter Anvin
2006-05-24 15:54 James Pearson
2006-05-24 16:46 ` linux-os (Dick Johnson)
2006-05-24 16:59   ` James Pearson
2006-05-24 17:56     ` H. Peter Anvin

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