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Mon, 28 Jan 2019 00:11:30 -0800

This bug is missing log files that will aid in diagnosing the problem.
While running an Ubuntu kernel (not a mainline or third-party kernel)
please enter the following command in a terminal window:

apport-collect 1813532

and then change the status of the bug to 'Confirmed'.

If, due to the nature of the issue you have encountered, you are unable
to run this command, please add a comment stating that fact and change
the bug status to 'Confirmed'.

This change has been made by an automated script, maintained by the
Ubuntu Kernel Team.

** Changed in: linux (Ubuntu)
       Status: New => Incomplete

** Tags added: bionic

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https://bugs.launchpad.net/bugs/1813532

Title:
  x86/mm: Found insecure W+X mapping at address (ptrval)/0xc00a0000

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  Booting an i386 Bionic kernel in a VM leads to:

  [    1.074702] Freeing unused kernel memory: 1092K
  [    1.084027] Write protecting the kernel text: 8836k
  [    1.085115] Write protecting the kernel read-only data: 3480k
  [    1.086361] NX-protecting the kernel data: 7548k
  [    1.087457] ------------[ cut here ]------------
  [    1.088400] x86/mm: Found insecure W+X mapping at address 
(ptrval)/0xc00a0000
  [    1.089738] WARNING: CPU: 0 PID: 1 at 
/build/linux-bnzN1b/linux-4.15.0/arch/x86/mm/dump_pagetables.c:266 
note_page+0x670/0x860
  [    1.091893] Modules linked in:
  [    1.092522] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 4.15.0-43-generic 
#46-Ubuntu
  [    1.094362] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 
1.11.1-1ubuntu1 04/01/2014
  [    1.096279] EIP: note_page+0x670/0x860
  [    1.097012] EFLAGS: 00010282 CPU: 0
  [    1.097807] EAX: 00000041 EBX: df4fbf44 ECX: 000001ba EDX: 00000000
  [    1.099083] ESI: 80000000 EDI: 00000000 EBP: df4fbf10 ESP: df4fbee4
  [    1.100328]  DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068
  [    1.101418] CR0: 80050033 CR2: b7d99092 CR3: 0ce16000 CR4: 000006f0
  [    1.102693] DR0: 00000000 DR1: 00000000 DR2: 00000000 DR3: 00000000
  [    1.103928] DR6: fffe0ff0 DR7: 00000400
  [    1.104733] Call Trace:
  [    1.105316]  ptdump_walk_pgd_level_core+0x2ac/0x2e0
  [    1.106266]  ptdump_walk_pgd_level_checkwx+0x18/0x20
  [    1.107207]  mark_rodata_ro+0xf5/0x117
  [    1.107947]  ? rest_init+0xa0/0xa0
  [    1.108627]  kernel_init+0x33/0xf0
  [    1.109300]  ret_from_fork+0x2e/0x38
  [    1.110016] Code: cc e9 0c fb ff ff f7 c6 00 10 00 00 74 8c 68 fe ae ae cc 
e9 16 fe ff ff 52 52 68 ac af ae cc c6 05 a8 a8 cb cc 01 e8 40 74 00 00 <0f> 0b 
8b 53 0c 83 c4 0c e9 38 fa ff ff 50 6a 08 52 6a 08 68 ae
  [    1.113395] ---[ end trace 0dce1996d96c40bb ]---
  [    1.114324] x86/mm: Checked W+X mappings: FAILED, 96 W+X pages found.

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