linux-kernel - Re: [PATCH] rdma: don't make pages writeable if not requiested

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: <20130321172150.GA3118@obsidianresearch.com>
Date:	Thu, 21 Mar 2013 11:21:50 -0600
From:	Jason Gunthorpe <jgunthorpe@...idianresearch.com>
To:	"Michael S. Tsirkin" <mst@...hat.com>
Cc:	Roland Dreier <roland@...nel.org>,
	"Michael R. Hines" <mrhines@...ux.vnet.ibm.com>,
	Sean Hefty <sean.hefty@...el.com>,
	Hal Rosenstock <hal.rosenstock@...il.com>,
	Yishai Hadas <yishaih@...lanox.com>,
	Christoph Lameter <cl@...ux.com>,
	"linux-rdma@...r.kernel.org" <linux-rdma@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>, qemu-devel@...gnu.org
Subject: Re: [PATCH] rdma: don't make pages writeable if not requiested

On Thu, Mar 21, 2013 at 07:15:25PM +0200, Michael S. Tsirkin wrote:

> No because application does this:
> init page
> 
> ...
> 
> after a lot of time
> 
> ..
> 
> register
> send
> unregister
> 
> so it can not be read only.

mprotect(READONLY)
register
send
unregister
mprotect(WRITABLE)

?

With something like GIFT the app already has to give up writing to the
pages while they are moving, so changing the protection seems in line
with that?

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/