linux-kernel - Re: [Xen-devel] [PATCH 3/3] xen/blkback: Check for insane amounts of request on the ring.

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]

Message-Id: <51066A1202000078000BA020@nat28.tlf.novell.com>
Date:	Mon, 28 Jan 2013 11:07:46 +0000
From:	"Jan Beulich" <JBeulich@...e.com>
To:	"Konrad Rzeszutek Wilk" <konrad.wilk@...cle.com>
Cc:	"Konrad Rzeszutek Wilk" <konrad@...nel.org>,
	"xen-devel" <xen-devel@...ts.xen.org>,
	<linux-kernel@...r.kernel.org>, <stable@...r.kernel.org>
Subject: Re: [Xen-devel] [PATCH 3/3] xen/blkback: Check for insane
 amounts of request on the ring.

>>> On 25.01.13 at 19:43, Konrad Rzeszutek Wilk <konrad.wilk@...cle.com> wrote:
> @@ -764,6 +768,9 @@ __do_block_io_op(struct xen_blkif *blkif)
>  	rp = blk_rings->common.sring->req_prod;
>  	rmb(); /* Ensure we see queued requests up to 'rp'. */
>  
> +	if (RING_REQUEST_PROD_OVERFLOW(&blk_rings->common, rp, rc))
> +		return -EACCES;

Actually I wonder whether we need the new macro at all: It seems
to me that using RING_REQUEST_CONS_OVERFLOW(&blk_rings->common, rp)
here would achieve the same effect.

Jan

> +
>  	while (rc != rp) {
>  
>  		if (RING_REQUEST_CONS_OVERFLOW(&blk_rings->common, rc))


--
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/