From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail.linuxfoundation.org ([140.211.169.12]:52363 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753917AbcGYBBZ (ORCPT ); Sun, 24 Jul 2016 21:01:25 -0400 Subject: Patch "s390: fix test_fp_ctl inline assembly contraints" has been added to the 4.6-stable tree To: schwidefsky@de.ibm.com, gregkh@linuxfoundation.org, heiko.carstens@de.ibm.com Cc: , From: Date: Sun, 24 Jul 2016 18:01:40 -0700 Message-ID: <146940850012976@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 s390: fix test_fp_ctl inline assembly contraints to the 4.6-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: s390-fix-test_fp_ctl-inline-assembly-contraints.patch and it can be found in the queue-4.6 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let know about it. >>From bcf4dd5f9ee096bd1510f838dd4750c35df4e38b Mon Sep 17 00:00:00 2001 From: Martin Schwidefsky Date: Mon, 27 Jun 2016 17:06:45 +0200 Subject: s390: fix test_fp_ctl inline assembly contraints From: Martin Schwidefsky commit bcf4dd5f9ee096bd1510f838dd4750c35df4e38b upstream. The test_fp_ctl function is used to test if a given value is a valid floating-point control. The inline assembly in test_fp_ctl uses an incorrect constraint for the 'orig_fpc' variable. If the compiler chooses the same register for 'fpc' and 'orig_fpc' the test_fp_ctl() function always returns true. This allows user space to trigger kernel oopses with invalid floating-point control values on the signal stack. This problem has been introduced with git commit 4725c86055f5bbdcdf "s390: fix save and restore of the floating-point-control register" Reviewed-by: Heiko Carstens Signed-off-by: Martin Schwidefsky Signed-off-by: Greg Kroah-Hartman --- arch/s390/include/asm/fpu/api.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/arch/s390/include/asm/fpu/api.h +++ b/arch/s390/include/asm/fpu/api.h @@ -22,7 +22,7 @@ static inline int test_fp_ctl(u32 fpc) " la %0,0\n" "1:\n" EX_TABLE(0b,1b) - : "=d" (rc), "=d" (orig_fpc) + : "=d" (rc), "=&d" (orig_fpc) : "d" (fpc), "0" (-EINVAL)); return rc; } Patches currently in stable-queue which might be from schwidefsky@de.ibm.com are queue-4.6/s390-fix-test_fp_ctl-inline-assembly-contraints.patch queue-4.6/kvm-s390-mm-fix-cmma-reset-during-reboot.patch queue-4.6/revert-s390-kdump-clear-subchannel-id-to-signal-non-ccw-scsi-ipl.patch