linux-kernel - [PATCH 3.16 294/294] net/xen-netback: disable on 64KB page granularity

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]

Date:   Mon, 06 Nov 2017 23:03:02 +0000
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org, "Arnd Bergmann" <arnd@...db.de>
Subject: [PATCH 3.16 294/294] net/xen-netback: disable on 64KB page 
 granularity

3.16.50-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Arnd Bergmann <arnd@...db.de>

Building the linux-3.16 stable branch, I ran into this warning that
shows a serious problem in the xen-netback driver:

drivers/net/xen-netback/netback.c: In function 'xenvif_dealloc_kthread':
drivers/net/xen-netback/netback.c:2002:1: error: the frame size of 16384 bytes is larger than 2048 bytes [-Werror=frame-larger-than=]

The bug was fixed in linux-4.4, but for any older stable kernel we
either need to backport that fix, or not use the driver when the page
size is set to 64KB. As the proper fix is way bigger than the usual limit
for stable backport patches, this adds a Kconfig dependency.

Fixes: d0089e8a0e4c ("net/xen-netback: Make it running on 64KB page granularity")
Signed-off-by: Arnd Bergmann <arnd@...db.de>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/net/Kconfig | 3 +++
 1 file changed, 3 insertions(+)

--- a/drivers/net/Kconfig
+++ b/drivers/net/Kconfig
@@ -331,6 +331,9 @@ config XEN_NETDEV_FRONTEND
 config XEN_NETDEV_BACKEND
 	tristate "Xen backend network device"
 	depends on XEN_BACKEND
+	depends on !(PAGE_SIZE_64KB || ARM64_64K_PAGES || \
+		     IA64_PAGE_SIZE_64KB || MICROBLAZE_64K_PAGES || \
+		     PARISC_PAGE_SIZE_64KB || PPC_64K_PAGES)
 	help
 	  This driver allows the kernel to act as a Xen network driver
 	  domain which exports paravirtual network devices to other