x86/mm: Found insecure W+X mapping at address 5096e094/0xc00a0000

[Reinis Danne]

mai 09 23:09:28 RD-NC kernel: ------------[ cut here ]------------
mai 09 23:09:28 RD-NC kernel: x86/mm: Found insecure W+X mapping at address 5096e094/0xc00a0000
mai 09 23:09:28 RD-NC kernel: WARNING: CPU: 1 PID: 1 at /build/linux-hwe-edge-OzxTzo/linux-hwe-edge-4.15.0/arch/x86/mm/dump_pagetables.c:266 note_page+0x5ec/0x790
mai 09 23:09:28 RD-NC kernel: Modules linked in:
mai 09 23:09:28 RD-NC kernel: CPU: 1 PID: 1 Comm: swapper/0 Not tainted 4.15.0-15-generic #16~16.04.1-Ubuntu
mai 09 23:09:28 RD-NC kernel: Hardware name: Hewlett-Packard Compaq Mini 110c-1000/308F, BIOS 308F0 Ver. F.07 06/18/2009
mai 09 23:09:28 RD-NC kernel: EIP: note_page+0x5ec/0x790
mai 09 23:09:28 RD-NC kernel: EFLAGS: 00010282 CPU: 1
mai 09 23:09:28 RD-NC kernel: EAX: 00000041 EBX: f6a07f44 ECX: d2e31548 EDX: 00000000
mai 09 23:09:28 RD-NC kernel: ESI: 80000000 EDI: 00000000 EBP: f6a07f10 ESP: f6a07ee4
mai 09 23:09:28 RD-NC kernel: DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068
mai 09 23:09:28 RD-NC kernel: CR0: 80050033 CR2: b7d6531c CR3: 12e1d000 CR4: 000006f0
mai 09 23:09:28 RD-NC kernel: Call Trace:
mai 09 23:09:28 RD-NC kernel: ptdump_walk_pgd_level_core+0x284/0x2e0
mai 09 23:09:28 RD-NC kernel: ptdump_walk_pgd_level_checkwx+0x18/0x20
mai 09 23:09:28 RD-NC kernel: mark_rodata_ro+0xf5/0x111
mai 09 23:09:28 RD-NC kernel: ? rest_init+0x90/0x90
mai 09 23:09:28 RD-NC kernel: kernel_init+0x2e/0xf0
mai 09 23:09:28 RD-NC kernel: ret_from_fork+0x19/0x38
mai 09 23:09:28 RD-NC kernel: Code: fa ff ff 83 c2 0c c7 43 18 00 00 00 00 89 53 14 e9 1a fd ff ff 8b 43 0c c6 05 a6 28 cc d2 01 50 50 68 d8 f6 ae d2 e8 f4 73 00 00 <0f> 0b 83 c4 0c e9 74 fa ff ff ff 72 10 68 cc f5 ae d2 e8 cc 4d
mai 09 23:09:28 RD-NC kernel: ---[ end trace caa86690bc0b7b17 ]---
mai 09 23:09:28 RD-NC kernel: x86/mm: Checked W+X mappings: FAILED, 96 W+X pages found.

And for linux-hwe-4.13.0 (not sure if it is the same issue):
mai 09 21:30:58 RD-NC kernel: ------------[ cut here ]------------
mai 09 21:30:58 RD-NC kernel: WARNING: CPU: 1 PID: 0 at /build/linux-hwe-NK5GZt/linux-hwe-4.13.0/arch/x86/mm/tlb.c:361 initialize_tlbstate_and_flush+0x158/0x160
mai 09 21:30:58 RD-NC kernel: Modules linked in:
mai 09 21:30:58 RD-NC kernel: CPU: 1 PID: 0 Comm: swapper/1 Not tainted 4.13.0-41-generic #46~16.04.1-Ubuntu
mai 09 21:30:58 RD-NC kernel: Hardware name: Hewlett-Packard Compaq Mini 110c-1000/308F, BIOS 308F0 Ver. F.07 06/18/2009
mai 09 21:30:58 RD-NC kernel: task: f6a0f500 task.stack: f6a2c000
mai 09 21:30:58 RD-NC kernel: EIP: initialize_tlbstate_and_flush+0x158/0x160
mai 09 21:30:58 RD-NC kernel: EFLAGS: 00210006 CPU: 1
mai 09 21:30:58 RD-NC kernel: EAX: 0cba1000 EBX: ccbe0d00 ECX: ccbe0e88 EDX: 0cda7000
mai 09 21:30:58 RD-NC kernel: ESI: f6a0f500 EDI: ccda7000 EBP: f6a2df54 ESP: f6a2df40
mai 09 21:30:58 RD-NC kernel: DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068
mai 09 21:30:58 RD-NC kernel: CR0: 80050033 CR2: 00000000 CR3: 0cba1000 CR4: 000006b0
mai 09 21:30:58 RD-NC kernel: Call Trace:
mai 09 21:30:58 RD-NC kernel: cpu_init+0xc9/0x280
mai 09 21:30:58 RD-NC kernel: start_secondary+0x24/0x1c0
mai 09 21:30:58 RD-NC kernel: startup_32_smp+0x16b/0x170
mai 09 21:30:58 RD-NC kernel: ? startup_32_smp+0x16b/0x170
mai 09 21:30:58 RD-NC kernel: Code: d8 cc c7 00 00 00 00 00 c7 40 04 00 00 00 00 89 c8 50 9d 8d 74 26 00 83 c3 10 39 de 75 cd 83 c4 08 5b 5e 5f 5d c3 90 8d 74 26 00 <0f> ff e9 dd fe ff ff 90 3e 8d 74 26 00 55 89 e5 57 56 53 83 ec
mai 09 21:30:58 RD-NC kernel: ---[ end trace ed2f75d938020e52 ]---

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: linux-image-4.15.0-15-generic 4.15.0-15.16~16.04.1
ProcVersionSignature: Ubuntu 4.15.0-15.16~16.04.1-generic 4.15.15
Uname: Linux 4.15.0-15-generic i686
ApportVersion: 2.20.1-0ubuntu2.16
Architecture: i386
CurrentDesktop: Unity
Date: Wed May 9 23:17:32 2018
InstallationDate: Installed on 2010-01-08 (3043 days ago)
InstallationMedia: Ubuntu-Netbook-Remix 9.10 "Karmic Koala" - Release i386 (20091028.4)
SourcePackage: linux-hwe-edge
UpgradeStatus: Upgraded to xenial on 2018-05-09 (0 days ago)

[Po-Hsu Lin (cypressyew)]

Hello,

can you still reproduce this now with the latest kernel? (If yes, please attach the "lsb_release -a ; uname -a" output from a terminal here)

Thanks

[Reinis Danne (readan2)]

I don't see it anymore.

~$ lsb_release -a && uname -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 18.04.2 LTS
Release: 18.04
Codename: bionic
Linux RD-NC 4.15.0-47-generic #50-Ubuntu SMP Wed Mar 13 10:40:37 UTC 2019 i686 i686 i686 GNU/Linux

The only suspect thing in the journal might be this failed resource sanity check:

apr 03 00:35:10 RD-NC kernel: Write protecting the kernel text: 8844k
apr 03 00:35:10 RD-NC kernel: Write protecting the kernel read-only data: 3484k
apr 03 00:35:10 RD-NC kernel: NX-protecting the kernel data: 7540k
apr 03 00:35:10 RD-NC kernel: x86/mm: PCI BIOS W+X mapping 96 pages
apr 03 00:35:10 RD-NC kernel: x86/mm: Checked W+X mappings: passed, no W+X pages found.
apr 03 00:35:10 RD-NC kernel: random: systemd-udevd: uninitialized urandom read (16 bytes read)
apr 03 00:35:10 RD-NC kernel: random: systemd-udevd: uninitialized urandom read (16 bytes read)
apr 03 00:35:10 RD-NC kernel: random: systemd-udevd: uninitialized urandom read (16 bytes read)
apr 03 00:35:10 RD-NC kernel: usb 1-4: New USB device found, idVendor=10f1, idProduct=1a0f
apr 03 00:35:10 RD-NC kernel: usb 1-4: New USB device strings: Mfr=2, Product=1, SerialNumber=0
apr 03 00:35:10 RD-NC kernel: usb 1-4: Product: Webcam-101
apr 03 00:35:10 RD-NC kernel: usb 1-4: Manufacturer: importek
apr 03 00:35:10 RD-NC kernel: ACPI: Video Device [IGD] (multi-head: yes rom: no post: no)
apr 03 00:35:10 RD-NC kernel: input: Video Bus as /devices/LNXSYSTM:00/LNXSYBUS:00/PNP0A08:00/LNXVIDEO:00/input/input9
apr 03 00:35:10 RD-NC kernel: clocksource: tsc: mask: 0xffffffffffffffff max_cycles: 0x1701db4419a, max_idle_ns: 440795259008 ns
apr 03 00:35:10 RD-NC kernel: ssb: Found chip with id 0x4312, rev 0x01 and package 0x00
apr 03 00:35:10 RD-NC kernel: ssb: Core 0 found: ChipCommon (cc 0x800, rev 0x16, vendor 0x4243)
apr 03 00:35:10 RD-NC kernel: ssb: Core 1 found: IEEE 802.11 (cc 0x812, rev 0x0F, vendor 0x4243)
apr 03 00:35:10 RD-NC kernel: ssb: Core 2 found: PCMCIA (cc 0x80D, rev 0x0A, vendor 0x4243)
apr 03 00:35:10 RD-NC kernel: ssb: Core 3 found: PCI-E (cc 0x820, rev 0x09, vendor 0x4243)
apr 03 00:35:10 RD-NC kernel: atl1c 0000:02:00.0: version 1.0.1.1-NAPI
apr 03 00:35:10 RD-NC kernel: ssb: Sonics Silicon Backplane found on PCI device 0000:01:00.0

apr 03 00:35:10 RD-NC kernel: pci 0000:00:00.0: Intel 945GME Chipset
apr 03 00:35:10 RD-NC kernel: pci 0000:00:00.0: detected gtt size: 262144K total, 262144K mappable
apr 03 00:35:10 RD-NC kernel: pci 0000:00:00.0: detected 8192K stolen memory
apr 03 00:35:10 RD-NC kernel: [drm] Memory usable by graphics device = 256M
apr 03 00:35:10 RD-NC kernel: checking generic (d0000000 240000) vs hw (d0000000 10000000)
apr 03 00:35:10 RD-NC kernel: fb: switching to inteldrmfb from VESA VGA
apr 03 00:35:10 RD-NC kernel: Console: switching to colour dummy device 80x25
apr 03 00:35:10 RD-NC kernel: [drm] Replacing VGA console driver
apr 03 00:35:10 RD-NC kernel: [drm] Supports vblank timestamp caching Rev 2 (21.10.2013).
apr 03 00:35:10 RD-NC kernel: [drm] Driver supports precise vblank timestamp query.
apr 03 00:35:10 RD-NC kernel: resource sanity check: requesting [mem 0x000c0000-0x000dffff], which spans m...

[Po-Hsu Lin (cypressyew)]

Hello,
thanks for the feedback.
Please feel free to open a new bug report if you have encountered any issue.