linux-kernel - Re: [PATCH] generic compat_sys

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Message-ID: <49B80E9D.3@sandeen.net>
Date:	Wed, 11 Mar 2009 14:18:53 -0500
From:	Eric Sandeen <sandeen@...deen.net>
To:	Christoph Hellwig <hch@....de>
CC:	linux-kernel@...r.kernel.org, davem@...emloft.net,
	tony.luck@...el.com, ralf@...ux-mips.org, kyle@...artin.ca,
	schwidefsky@...ibm.com
Subject: Re: [PATCH] generic compat_sys_ustat

Christoph Hellwig wrote:
> Due to a different size of ino_t ustat needs a compat handler, but
> currently only x86 and mips provide one.  Add a generic compat_sys_ustat
> and switch all architectures over to it.  Instead of doing various
> user copy hacks compat_sys_ustat just reimplements sys_ustat as
> it's trivial.  This was suggested by Arnd Bergmann.
> 
> Found by Eric Sandeen when running xfstests/017 on ppc64, which causes
> stack smashing warnings on RHEL/Fedora due to the too large amount of
> data writen by the syscall.
> 
> Signed-off-by: Christoph Hellwig <hch@....de>

Looks like this got lost?

-Eric

> 
> Index: linux-2.6/arch/x86/ia32/ia32entry.S
> ===================================================================
> --- linux-2.6.orig/arch/x86/ia32/ia32entry.S	2008-11-28 14:09:01.000000000 +0530
> +++ linux-2.6/arch/x86/ia32/ia32entry.S	2008-11-28 14:09:16.000000000 +0530
> @@ -555,7 +555,7 @@ ia32_sys_call_table:
>  	.quad sys32_olduname
>  	.quad sys_umask		/* 60 */
>  	.quad sys_chroot
> -	.quad sys32_ustat
> +	.quad compat_sys_ustat
>  	.quad sys_dup2
>  	.quad sys_getppid
>  	.quad sys_getpgrp		/* 65 */

....
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