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
| ||
|
Date: Thu, 21 Mar 2013 19:42:37 +0200 From: "Michael S. Tsirkin" <mst@...hat.com> To: Jason Gunthorpe <jgunthorpe@...idianresearch.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 11:21:50AM -0600, Jason Gunthorpe wrote: > 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 It doesn't actually, and our app would sometimes write to these pages. It simply does not care which version does the remote get in this case since we track writes and resend later. Also this is per-page, MRs have byte granularity so easier to use. -- MST -- 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/
Powered by blists - more mailing lists