linux-kernel - Re: [PATCH][Resend v2] Fix infinite loop in search_binary

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Message-Id: <201107052102.BHE69234.OLQOVMJFOFFHSt@I-love.SAKURA.ne.jp>
Date:	Tue, 5 Jul 2011 21:02:34 +0900
From:	Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
To:	richard@....at
Cc:	viro@...iv.linux.org.uk, akpm@...ux-foundation.org,
	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org
Subject: Re: [PATCH][Resend v2] Fix infinite loop in search_binary_handler()

Richard Weinberger wrote:
> But IMHO adding a new attribute to task_struct is a bit overkill.
> Why is your variant better than my strcmp() in fs/exec.c?

Say, there are multiple /sbin/modprobe

/sbin/modprobe
/var/chroot/sbin/modprobe

and only /var/chroot/sbin/modprobe needs request_module() whereas
/sbin/modprobe does not need request_module(). Why do we need to make
execl("/sbin/modprobe", "--help", NULL) from chroot("/var/chroot/") fail
by denying request_module() that does not cause recursion?
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