linux-kernel - Re: [PATCH] alpha: binfmt

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Message-ID: <20090424150549.GN8633@ZenIV.linux.org.uk>
Date:	Fri, 24 Apr 2009 16:05:49 +0100
From:	Al Viro <viro@...IV.linux.org.uk>
To:	Ivan Kokshaysky <ink@...assic.park.msu.ru>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Richard Henderson <rth@...ddle.net>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] alpha: binfmt_aout fix

On Fri, Apr 24, 2009 at 06:47:38PM +0400, Ivan Kokshaysky wrote:
> This fixes the problem introduced by commit 3bfacef412 (get rid of
> special-casing the /sbin/loader on alpha): osf/1 ecoff binary
> segfaults when binfmt_aout built as module. That happens because
> aout binary handler gets on the top of the binfmt list due to late
> registration, and kernel attempts to execute the binary without
> preparatory work that must be done by binfmt_loader.
> 
> Fixed by changing the registration order of the default
> binfmt handlers using list_add_tail() and introducing insert_binfmt()
> function which places new handler on the top of the binfmt list.
> This might be generally useful for installing arch-specific frontends
> for default handlers or just for overriding them.

Hmm...  How about always doing list_add_tail() instead?
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