netdev - Re: [PATCH] gianfar: Add I/O barriers when touching buffer descriptor ownership.

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]

Date:	Thu, 17 May 2007 20:45:49 -0400
From:	Jeff Garzik <jeff@...zik.org>
To:	Scott Wood <scottwood@...escale.com>
CC:	netdev@...r.kernel.org, linuxppc-dev@...abs.org
Subject: Re: [PATCH] gianfar: Add I/O barriers when touching buffer descriptor
 ownership.

Scott Wood wrote:
> The hardware must not see that is given ownership of a buffer until it is
> completely written, and when the driver receives ownership of a buffer,
> it must ensure that any other reads to the buffer reflect its final
> state.  Thus, I/O barriers are added where required.
> 
> Without this patch, I have observed GCC reordering the setting of
> bdp->length and bdp->status in gfar_new_skb.  Hardware reordering
> was also theoretically possible.
> 
> Signed-off-by: Scott Wood <scottwood@...escale.com>
> ---
> I've added the requested comments to the source code about
> the use of eieio().  Jeff, please consider for 2.6.22, as it
> fixes a bug that has been observed.
> 
>  drivers/net/gianfar.c |   11 +++++++++++
>  1 files changed, 11 insertions(+), 0 deletions(-)

applied


-
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html