linux-kernel - Re: bug reading /proc/sys/kernel/*: only first byte read.

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Message-ID: <45BF6AEB.10408@tls.msk.ru>
Date:	Tue, 30 Jan 2007 18:57:31 +0300
From:	Michael Tokarev <mjt@....msk.ru>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
CC:	Oleg Nesterov <oleg@...sign.ru>, Andrew Morton <akpm@...l.org>,
	Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: bug reading /proc/sys/kernel/*: only first byte read.

Eric W. Biederman wrote:
[]
> However as far as I can tell the code has this limitation
> deliberately for simplicity.
> 
> Getting the string side of this fixed even by itself is
> worthwhile, although it might be worth teach people
> about sys_uname and /bin/uname.  It seems is the biggest thing
> people look at /proc/sys/ for...

I come across this very issue when I discovered another bug,
using un-initialized pipefs structures during early hotplug
calls.  I know about /bin/uname, but it requires a pipe, so
wont work.  Obvious alternative is /proc/sys/version, which
is alot faster too (no fork+exec overhead).

/mjt
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