linux-kernel - RE: [PATCH] mtd: atmel_nand: fix access to 16 bit NAND devices

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Message-ID: <1328247161.6750.23.camel@sauron.fi.intel.com>
Date:	Fri, 03 Feb 2012 07:32:41 +0200
From:	Artem Bityutskiy <dedekind1@...il.com>
To:	Venu Byravarasu <vbyravarasu@...dia.com>
Cc:	Nicolas Ferre <nicolas.ferre@...el.com>,
	"Voss, Nikolaus" <N.Voss@...nmann.de>,
	Eric Bénard <eric@...rea.com>,
	"'linux-mtd@...ts.infradead.org'" <linux-mtd@...ts.infradead.org>,
	"'linux-kernel@...r.kernel.org'" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH] mtd: atmel_nand: fix access to 16 bit NAND devices

On Fri, 2012-02-03 at 09:05 +0530, Venu Byravarasu wrote:
> I see a problem with atmel_read_buf16 & atmel_write_buf16 functions.
> As they are calling __raw_readsw & __raw_writesw respectively, which 
> would cause panic in cases of 16 bit unaligned buffers.
> However, the buf passed to these functions is of type u8* from 
> atmel_read_buf & atmel_write_buf functions.

I think this is a valid concern. In theory, the NAND infrustructure must
guarantee that the buffer is always of even length, and most probably it
does, but we could add a WARN_ON(len & 1) statements in
'atmel_read_buf()' and 'atmel_write_buf()'.

And probably the type could indeed be changed.

But these concerns should be addressed separately.

-- 
Best Regards,
Artem Bityutskiy

Download attachment "signature.asc" of type "application/pgp-signature" (837 bytes)