linux-kernel - Re: [PATCH] tpm, tpm_crb: fix unaligned read of the command buffer address

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

Date:	Mon, 14 Sep 2015 11:35:23 -0600
From:	Jason Gunthorpe <jgunthorpe@...idianresearch.com>
To:	Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
Cc:	tpmdd-devel@...ts.sourceforge.net, linux-kernel@...r.kernel.org,
	Peter Huewe <peterhuewe@....de>,
	Marcel Selhorst <tpmdd@...horst.net>
Subject: Re: [PATCH] tpm, tpm_crb: fix unaligned read of the command buffer
 address

On Mon, Sep 14, 2015 at 08:15:23PM +0300, Jarkko Sakkinen wrote:
> The command buffer address is necessarily not naturally aligned.
> The hardware drops the entire read on some platforms and fills the
> address with 1's. This patch fixes the issue by splitting the read
> into two 32 bit reads.

Is this necessary? The packed attribution means that unaligned members
are allowed and the compiler deals with it where necessary.

Jason
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/