From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail.linuxfoundation.org ([140.211.169.12]:56010 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753040AbdGCM3e (ORCPT ); Mon, 3 Jul 2017 08:29:34 -0400 Subject: Patch "x86/mpx: Correctly report do_mpx_bt_fault() failures to user-space" has been added to the 4.11-stable tree To: jroedel@suse.de, bp@alien8.de, brgerst@gmail.com, dave.hansen@linux.intel.com, dvlasenk@redhat.com, gregkh@linuxfoundation.org, hpa@zytor.com, jpoimboe@redhat.com, luto@kernel.org, mingo@kernel.org, peterz@infradead.org, tglx@linutronix.de, torvalds@linux-foundation.org Cc: , From: Date: Mon, 03 Jul 2017 14:29:27 +0200 Message-ID: <149908496716690@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 x86/mpx: Correctly report do_mpx_bt_fault() failures to user-space to the 4.11-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: x86-mpx-correctly-report-do_mpx_bt_fault-failures-to-user-space.patch and it can be found in the queue-4.11 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let know about it. >>From 5ed386ec09a5d75bcf073967e55e895c2607a5c3 Mon Sep 17 00:00:00 2001 From: Joerg Roedel Date: Thu, 6 Apr 2017 16:19:22 +0200 Subject: x86/mpx: Correctly report do_mpx_bt_fault() failures to user-space From: Joerg Roedel commit 5ed386ec09a5d75bcf073967e55e895c2607a5c3 upstream. When this function fails it just sends a SIGSEGV signal to user-space using force_sig(). This signal is missing essential information about the cause, e.g. the trap_nr or an error code. Fix this by propagating the error to the only caller of mpx_handle_bd_fault(), do_bounds(), which sends the correct SIGSEGV signal to the process. Signed-off-by: Joerg Roedel Cc: Andy Lutomirski Cc: Borislav Petkov Cc: Brian Gerst Cc: Dave Hansen Cc: Denys Vlasenko Cc: H. Peter Anvin Cc: Josh Poimboeuf Cc: Linus Torvalds Cc: Peter Zijlstra Cc: Thomas Gleixner Fixes: fe3d197f84319 ('x86, mpx: On-demand kernel allocation of bounds tables') Link: http://lkml.kernel.org/r/1491488362-27198-1-git-send-email-joro@8bytes.org Signed-off-by: Ingo Molnar Signed-off-by: Greg Kroah-Hartman --- arch/x86/mm/mpx.c | 10 +--------- 1 file changed, 1 insertion(+), 9 deletions(-) --- a/arch/x86/mm/mpx.c +++ b/arch/x86/mm/mpx.c @@ -526,15 +526,7 @@ int mpx_handle_bd_fault(void) if (!kernel_managing_mpx_tables(current->mm)) return -EINVAL; - if (do_mpx_bt_fault()) { - force_sig(SIGSEGV, current); - /* - * The force_sig() is essentially "handling" this - * exception, so we do not pass up the error - * from do_mpx_bt_fault(). - */ - } - return 0; + return do_mpx_bt_fault(); } /* Patches currently in stable-queue which might be from jroedel@suse.de are queue-4.11/x86-mpx-correctly-report-do_mpx_bt_fault-failures-to-user-space.patch