linux-kernel - Re: [PATCH] fs: partitions: efi: Fix bound check

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Date:	Wed, 20 Nov 2013 08:36:57 +0100
From:	Hiroshi Doyu <hdoyu@...dia.com>
To:	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
	Antti Miettinen <amiettinen@...dia.com>
CC:	"axboe@...nel.dk" <axboe@...nel.dk>,
	"davidlohr@...com" <davidlohr@...com>,
	"matt.fleming@...el.com" <matt.fleming@...el.com>,
	"kzak@...hat.com" <kzak@...hat.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] fs: partitions: efi: Fix bound check

Antti Miettinen <amiettinen@...dia.com> wrote @ Wed, 20 Nov 2013 08:18:50 +0100:

> On 20.11.2013 02:04, Andrew Morton wrote:
> > On Fri, 15 Nov 2013 19:14:22 +0200 (EET) Antti P Miettinen
> > <amiettinen@...dia.com> wrote:
> >
> >  > Use ARRAY_SIZE instead of sizeof to get proper max for label
> >  > length.
> >  >
> >  > Signed-off-by: Antti P Miettinen <amiettinen@...dia.com>
> >  > Reviewed-by: Hiroshi Doyu <hdoyu@...dia.com>
> >  > Tested-by: Hiroshi Doyu <hdoyu@...dia.com>
> >
> > When fixing a bug, please provide a description of the user-visible
> > impact of that bug.  This is so that others can decide which kernel
> > version(s) need the patch.
> >
> > Hiroshi Doyu tested this patch, so I assume there was some observable
> > misbehaviour to test.  Please fully describe that.
> 
> Since this is just a read out of bounds it's not that bad, but the 
> problem becomes user-visible e.g. if one tries to use 
> CONFIG_DEBUG_PAGEALLOC and CONFIG_DEBUG_RODATA, at least with some 
> enhancements from Hiroshi.

The above enhancement is almost ARCH_SUPPORTS_DEBUG_PAGEALLOC for ARM,
which could catch illegal memory access(read/write) with a page fault
although that enhancement itself needs some cleanups before being
upstreamed.
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