From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail.linuxfoundation.org ([140.211.169.12]:49928 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755550AbeASJ2N (ORCPT ); Fri, 19 Jan 2018 04:28:13 -0500 Subject: Patch "module: Add retpoline tag to VERMAGIC" has been added to the 4.9-stable tree To: ak@linux.intel.com, dwmw@amazon.co.uk, gregkh@linuxfoundation.org, tglx@linutronix.de Cc: , From: Date: Fri, 19 Jan 2018 10:27:31 +0100 Message-ID: <1516354051106111@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 module: Add retpoline tag to VERMAGIC 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: module-add-retpoline-tag-to-vermagic.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 6cfb521ac0d5b97470883ff9b7facae264b7ab12 Mon Sep 17 00:00:00 2001 From: Andi Kleen Date: Tue, 16 Jan 2018 12:52:28 -0800 Subject: module: Add retpoline tag to VERMAGIC From: Andi Kleen commit 6cfb521ac0d5b97470883ff9b7facae264b7ab12 upstream. Add a marker for retpoline to the module VERMAGIC. This catches the case when a non RETPOLINE compiled module gets loaded into a retpoline kernel, making it insecure. It doesn't handle the case when retpoline has been runtime disabled. Even in this case the match of the retcompile status will be enforced. This implies that even with retpoline run time disabled all modules loaded need to be recompiled. Signed-off-by: Andi Kleen Signed-off-by: Thomas Gleixner Reviewed-by: Greg Kroah-Hartman Acked-by: David Woodhouse Cc: rusty@rustcorp.com.au Cc: arjan.van.de.ven@intel.com Cc: jeyu@kernel.org Cc: torvalds@linux-foundation.org Link: https://lkml.kernel.org/r/20180116205228.4890-1-andi@firstfloor.org Signed-off-by: Greg Kroah-Hartman --- include/linux/vermagic.h | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) --- a/include/linux/vermagic.h +++ b/include/linux/vermagic.h @@ -24,10 +24,16 @@ #ifndef MODULE_ARCH_VERMAGIC #define MODULE_ARCH_VERMAGIC "" #endif +#ifdef RETPOLINE +#define MODULE_VERMAGIC_RETPOLINE "retpoline " +#else +#define MODULE_VERMAGIC_RETPOLINE "" +#endif #define VERMAGIC_STRING \ UTS_RELEASE " " \ MODULE_VERMAGIC_SMP MODULE_VERMAGIC_PREEMPT \ MODULE_VERMAGIC_MODULE_UNLOAD MODULE_VERMAGIC_MODVERSIONS \ - MODULE_ARCH_VERMAGIC + MODULE_ARCH_VERMAGIC \ + MODULE_VERMAGIC_RETPOLINE Patches currently in stable-queue which might be from ak@linux.intel.com are queue-4.9/module-add-retpoline-tag-to-vermagic.patch queue-4.9/x86-retpoline-fill-rsb-on-context-switch-for-affected-cpus.patch queue-4.9/x86-retpoline-add-lfence-to-the-retpoline-rsb-filling-rsb-macros.patch