From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail.linuxfoundation.org ([140.211.169.12]:57276 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932153AbeB1PRA (ORCPT ); Wed, 28 Feb 2018 10:17:00 -0500 Subject: Patch "xen/gntdev: Fix partial gntdev_mmap() cleanup" has been added to the 4.9-stable tree To: ross.lagerwall@citrix.com, alexander.levin@microsoft.com, boris.ostrovsky@oracle.com, gregkh@linuxfoundation.org Cc: , From: Date: Wed, 28 Feb 2018 16:15:18 +0100 Message-ID: <1519830918481@kroah.com> MIME-Version: 1.0 Content-Type: text/plain; charset=ANSI_X3.4-1968 Content-Transfer-Encoding: 8bit Sender: stable-owner@vger.kernel.org List-ID: This is a note to let you know that I've just added the patch titled xen/gntdev: Fix partial gntdev_mmap() cleanup to the 4.9-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: xen-gntdev-fix-partial-gntdev_mmap-cleanup.patch and it can be found in the queue-4.9 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let know about it. >>From foo@baz Wed Feb 28 16:13:29 CET 2018 From: Ross Lagerwall Date: Tue, 9 Jan 2018 12:10:22 +0000 Subject: xen/gntdev: Fix partial gntdev_mmap() cleanup From: Ross Lagerwall [ Upstream commit cf2acf66ad43abb39735568f55e1f85f9844e990 ] When cleaning up after a partially successful gntdev_mmap(), unmap the successfully mapped grant pages otherwise Xen will kill the domain if in debug mode (Attempt to implicitly unmap a granted PTE) or Linux will kill the process and emit "BUG: Bad page map in process" if Xen is in release mode. This is only needed when use_ptemod is true because gntdev_put_map() will unmap grant pages itself when use_ptemod is false. Signed-off-by: Ross Lagerwall Reviewed-by: Boris Ostrovsky Signed-off-by: Boris Ostrovsky Signed-off-by: Sasha Levin Signed-off-by: Greg Kroah-Hartman --- drivers/xen/gntdev.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) --- a/drivers/xen/gntdev.c +++ b/drivers/xen/gntdev.c @@ -1077,8 +1077,10 @@ unlock_out: out_unlock_put: mutex_unlock(&priv->lock); out_put_map: - if (use_ptemod) + if (use_ptemod) { map->vma = NULL; + unmap_grant_pages(map, 0, map->count); + } gntdev_put_map(priv, map); return err; } Patches currently in stable-queue which might be from ross.lagerwall@citrix.com are queue-4.9/xen-gntdev-fix-off-by-one-error-when-unmapping-with-holes.patch queue-4.9/xen-gntdev-fix-partial-gntdev_mmap-cleanup.patch