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Mon, 28 Jan 2019 00:11:25 -0800

Public bug reported:

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.

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: Incomplete


** Tags: bionic

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free online bettinghttps://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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