Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S935165AbdDFOTw (ORCPT ); Thu, 6 Apr 2017 10:19:52 -0400 Received: from 8bytes.org ([81.169.241.247]:44219 "EHLO theia.8bytes.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S934375AbdDFOTn (ORCPT ); Thu, 6 Apr 2017 10:19:43 -0400 From: Joerg Roedel To: Thomas Gleixner , Ingo Molnar , "H. Peter Anvin" Cc: x86@kernel.org, Dave Hansen , linux-kernel@vger.kernel.org, Joerg Roedel Subject: [PATCH] x86/mpx: Correctly report do_mpx_bt_fault() failures to user-space Date: Thu, 6 Apr 2017 16:19:22 +0200 Message-Id: <1491488362-27198-1-git-send-email-joro@8bytes.org> X-Mailer: git-send-email 1.9.1 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1102 Lines: 40 From: Joerg Roedel 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. Fixes: fe3d197f84319 ('x86, mpx: On-demand kernel allocation of bounds tables') Signed-off-by: Joerg Roedel --- arch/x86/mm/mpx.c | 10 +--------- 1 file changed, 1 insertion(+), 9 deletions(-) diff --git a/arch/x86/mm/mpx.c b/arch/x86/mm/mpx.c index cd44ae7..1c34b76 100644 --- 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(); } /* -- 1.9.1