From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932649AbeCISyj (ORCPT ); Fri, 9 Mar 2018 13:54:39 -0500 Received: from smtp2.it.da.ut.ee ([193.40.5.67]:60284 "EHLO smtp2.it.da.ut.ee" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932551AbeCISyf (ORCPT ); Fri, 9 Mar 2018 13:54:35 -0500 Date: Fri, 9 Mar 2018 20:54:29 +0200 (EET) From: Meelis Roos To: Linux Kernel list Subject: Re: 4.15-rc9 new insecure W+X mapping warning In-Reply-To: Message-ID: References: User-Agent: Alpine 2.21 (LRH 202 2017-01-01) MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org > This is Intel SE7520JR22S mainboard with 2 64-bit P4 xeons. Earlier > kernels up to 4.14 have had W+X checking on but found nothing. Now I > tried 4.15.0-rc9-00023-g1f07476ec143 and it gives a new W+X warning. Actually, I was wrong about earlier kernels - I just did not have CONFIG_DEBUG_WX turned on before and eralier kernels did not check it. Recompiled 4.14 with CONFIG_DEBUG_WX=y and the problem is there. So this is not a Linux regression but a peculiarity with the SE7520JR22S, it seems. Is there anything that Linux might be doing wrong? > [ 10.880663] ------------[ cut here ]------------ > [ 10.880755] x86/mm: Found insecure W+X mapping at address 00000000d051fb08/0xffff880000000000 > [ 10.880900] WARNING: CPU: 2 PID: 1 at arch/x86/mm/dump_pagetables.c:266 note_page+0x718/0xb89 > [ 10.881035] Modules linked in: > [ 10.881128] CPU: 2 PID: 1 Comm: swapper/0 Not tainted 4.15.0-rc9-00023-g1f07476ec143 #104 > [ 10.881264] Hardware name: Intel /SE7520JR22S, BIOS SE7520JR22.86B.P.10.00.0087.120820051348 12/08/2005 > [ 10.881405] RIP: 0010:note_page+0x718/0xb89 > [ 10.881491] RSP: 0000:ffffc90000013e48 EFLAGS: 00010296 > [ 10.881578] RAX: 0000000000000051 RBX: ffffc90000013ec8 RCX: ffffffff8164f938 > [ 10.881666] RDX: 0000000000000001 RSI: 0000000000000092 RDI: ffffffff82b468cc > [ 10.881756] RBP: 0000000000000061 R08: 0000000000000177 R09: 00000000000001d7 > [ 10.881844] R10: 0720072007200720 R11: 0720072007200720 R12: 0000000000000000 > [ 10.881932] R13: 0000000000000000 R14: 0000000000000001 R15: 8800000990000000 > [ 10.882022] FS: 0000000000000000(0000) GS:ffff88003fc80000(0000) knlGS:0000000000000000 > [ 10.882156] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > [ 10.882243] CR2: 0000000000000000 CR3: 000000000200a000 CR4: 00000000000006e0 > [ 10.882331] Call Trace: > [ 10.882423] ptdump_walk_pgd_level_core+0x367/0x3a5 > [ 10.882511] ptdump_walk_pgd_level_checkwx+0x10/0x3e > [ 10.882602] kernel_init+0x2e/0x10f > [ 10.882688] ? rest_init+0xb9/0xb9 > [ 10.882775] ret_from_fork+0x35/0x40 > [ 10.882861] Code: fb ff ff 41 f7 c7 00 10 00 00 0f 85 e2 fe ff ff e9 36 fd ff ff c6 05 7d 45 6f 01 01 48 89 f2 48 c7 c7 08 5b ee 81 e8 4b d6 00 00 <0f> ff 48 8b 73 10 e9 bc f9 ff ff 4d 85 ed 0f 84 b9 01 00 00 41 > [ 10.883103] ---[ end trace bc3e2cf1a1adfa39 ]--- > [ 10.896336] x86/mm: Checked W+X mappings: FAILED, 266243 W+X pages found. > [ 10.896430] x86/mm: Checking user space page tables > [ 10.909522] x86/mm: Checked W+X mappings: FAILED, 56 W+X pages found. -- Meelis Roos (mroos@linux.ee)