Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751466AbdGRIuw (ORCPT ); Tue, 18 Jul 2017 04:50:52 -0400 Received: from mail-wr0-f171.google.com ([209.85.128.171]:34623 "EHLO mail-wr0-f171.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751334AbdGRIus (ORCPT ); Tue, 18 Jul 2017 04:50:48 -0400 Date: Tue, 18 Jul 2017 09:50:35 +0100 From: Piotr Gregor To: tglx@linutronix.de Cc: mingo@redhat.com, hpa@zytor.com, x86@kernel.org, linux-kernel@vger.kernel.org, linux-rt-users@vger.kernel.org Subject: [BUG] x86/mm: Found insecure W+X mapping at address ffff88000005f000/0xffff88000005f000 Message-ID: <20170718085034.GA6388@piotrpc> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Reported-By: Piotr Gregor User-Agent: Mutt/1.5.23 (2014-03-12) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 5980 Lines: 98 Hi Thomas, Dmesg reports insecure W+X mapping found at address ffff88000005f000/0xffff88000005f000 on 4.4.70 kernel patched with -rt83 patch: # uname -a Linux piotrpc 4.4.70-rt83 #1 SMP PREEMPT RT Thu Jul 13 08:42:02 BST 2017 x86_64 GNU/Linux [ 4.888146] Serial: 8250/16550 driver, 4 ports, IRQ sharing enabled [ 4.909507] 00:02: ttyS0 at I/O 0x3f8 (irq = 4, base_baud = 115200) is a 16550A [ 4.931377] 00:03: ttyS1 at I/O 0x2f8 (irq = 3, base_baud = 115200) is a 16550A [ 4.933500] serial 0000:04:00.0: enabling device (0000 -> 0003) [ 4.958689] 0000:04:00.0: ttyS2 at I/O 0xe010 (irq = 18, base_baud = 115200) is a ST16650V2 [ 4.959402] serial 0000:04:00.1: enabling device (0000 -> 0003) [ 4.982118] 0000:04:00.1: ttyS3 at I/O 0xe000 (irq = 19, base_baud = 115200) is a ST16650V2 [ 4.983587] Linux agpgart interface v0.103 [ 4.984757] AMD IOMMUv2 driver by Joerg Roedel [ 4.984758] AMD IOMMUv2 functionality not available on this system [ 4.991048] i8042: PNP: No PS/2 controller found. Probing ports directly. [ 4.995120] serio: i8042 KBD port at 0x60,0x64 irq 1 [ 4.995228] serio: i8042 AUX port at 0x60,0x64 irq 12 [ 4.997121] mousedev: PS/2 mouse device common for all mice [ 4.997633] rtc_cmos 00:06: RTC can wake from S4 [ 4.998756] rtc_cmos 00:06: rtc core: registered rtc_cmos as rtc0 [ 4.999328] rtc_cmos 00:06: alarms up to one month, y3k, 242 bytes nvram, hpet irqs [ 4.999420] Intel P-state driver initializing. [ 4.999429] intel_pstate: HWP enabled [ 5.011424] NET: Registered protocol family 10 [ 5.013542] mip6: Mobile IPv6 [ 5.013581] NET: Registered protocol family 17 [ 5.013595] mpls_gso: MPLS GSO support [ 5.016288] microcode: CPU0 sig=0x506e3, pf=0x2, revision=0xa0 [ 5.016308] microcode: CPU1 sig=0x506e3, pf=0x2, revision=0xa0 [ 5.016362] microcode: CPU2 sig=0x506e3, pf=0x2, revision=0xa0 [ 5.016416] microcode: CPU3 sig=0x506e3, pf=0x2, revision=0xa0 [ 5.016475] microcode: CPU4 sig=0x506e3, pf=0x2, revision=0xa0 [ 5.016503] microcode: CPU5 sig=0x506e3, pf=0x2, revision=0xa0 [ 5.016585] microcode: CPU6 sig=0x506e3, pf=0x2, revision=0xa0 [ 5.016642] microcode: CPU7 sig=0x506e3, pf=0x2, revision=0xa0 [ 5.017158] microcode: Microcode Update Driver: v2.01 , Peter Oruba [ 5.018455] registered taskstats version 1 [ 5.018595] zswap: loaded using pool lzo/zbud [ 5.019280] ima: No TPM chip found, activating TPM-bypass! [ 5.025017] rtc_cmos 00:06: setting system clock to 2017-07-18 07:39:01 UTC (1500363541) [ 5.025669] PM: Hibernation image not present or could not be loaded. [ 5.031098] Freeing unused kernel memory: 3484K (ffffffff81d55000 - ffffffff820bc000) [ 5.031100] Write protecting the kernel read-only data: 12288k [ 5.036397] Freeing unused kernel memory: 1436K (ffff880002899000 - ffff880002a00000) [ 5.039665] Freeing unused kernel memory: 976K (ffff880002d0c000 - ffff880002e00000) [ 5.039669] ------------[ cut here ]------------ [ 5.039672] WARNING: CPU: 1 PID: 1 at arch/x86/mm/dump_pagetables.c:225 note_page+0x61e/0x7e0() [ 5.039673] x86/mm: Found insecure W+X mapping at address ffff88000005f000/0xffff88000005f000 [ 5.039674] Modules linked in: [ 5.039677] CPU: 1 PID: 1 Comm: swapper/0 Not tainted 4.4.70-rt83 #1 [ 5.039679] Hardware name: NOVATECH LTD PC-XB04472/H110M-C, BIOS 3019 01/06/2017 [ 5.039681] 0000000000000000 ffff880226a97d60 ffffffff81387160 ffff880226a97da8 [ 5.039682] 0000000000000009 ffff880226a97d98 ffffffff81089766 ffff880004145308 [ 5.039683] 0000000000000004 8000000000000163 ffff880226a97e98 0000000000000000 [ 5.039683] Call Trace: [ 5.039692] [] dump_stack+0x85/0xc5 [ 5.039694] [] warn_slowpath_common+0x86/0xe0 [ 5.039696] [] warn_slowpath_fmt+0x4c/0x50 [ 5.039698] [] note_page+0x61e/0x7e0 [ 5.039699] [] ptdump_walk_pgd_level_core+0x371/0x420 [ 5.039703] [] ptdump_walk_pgd_level_checkwx+0x17/0x20 [ 5.039704] [] mark_rodata_ro+0xee/0x100 [ 5.039706] [] ? rest_init+0x140/0x140 [ 5.039707] [] kernel_init+0x1d/0xe0 [ 5.039709] [] ret_from_fork+0x3f/0x70 [ 5.039710] [] ? rest_init+0x140/0x140 [ 5.039712] ---[ end trace 0000000000000002 ]--- [ 5.044120] x86/mm: Checked W+X mappings: FAILED, 55997 W+X pages found. [ 5.085104] systemd-udevd[134]: starting version 215 [ 5.086349] random: systemd-udevd: uninitialized urandom read (16 bytes read, 6 bits of entropy available) [ 5.173659] FUJITSU Extended Socket Network Device Driver - version 1.0 - Copyright (c) 2015 FUJITSU LIMITED [ 5.265179] hidraw: raw HID events driver (C) Jiri Kosina [ 5.698741] thermal LNXTHERM:00: registered as thermal_zone0 [ 5.698745] ACPI: Thermal Zone [TZ00] (28 C) [ 5.707387] pps_core: LinuxPPS API ver. 1 registered [ 5.707389] pps_core: Software ver. 5.3.6 - Copyright 2005-2007 Rodolfo Giometti [ 5.718091] thermal LNXTHERM:01: registered as thermal_zone1 [ 5.718095] ACPI: Thermal Zone [TZ01] (30 C) [ 5.742162] ACPI: bus type USB registered [ 5.743514] PTP clock support registered [ 5.749182] usbcore: registered new interface driver usbfs [ 5.754191] usbcore: registered new interface driver hub [ 5.757681] usbcore: registered new device driver usb [ 5.830580] i801_smbus 0000:00:1f.4: SMBus using PCI interrupt [ 5.831771] tg3.c:v3.137 (May 11, 2014) [ 5.831786] tg3 0000:01:00.0: enabling device (0000 -> 0002) [ 5.836078] tsc: Refined TSC clocksource calibration: 3407.991 MHz [ 5.836081] clocksource: tsc: mask: 0xffffffffffffffff max_cycles: 0x311fcb8dbdf, max_idle_ns: 440795301826 ns [ 5.848627] r8169 Gigabit Ethernet driver 2.3LK-NAPI loaded cheers, Piotr