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[Bug 1549601] Re: [Hyper-V] x86, pageattr: prevent overflow in slow_virt_to_phys() for X86_PAE

To: group.of.nepali.translators@xxxxxxxxxxxxxxxxxxx
From: Joseph Salisbury <joseph.salisbury@xxxxxxxxxxxxx>
Date: Wed, 02 Mar 2016 23:03:21 -0000
Reply-to: Bug 1549601 <1549601@xxxxxxxxxxxxxxxxxx>
Sender: bounces@xxxxxxxxxxxxx

** Changed in: linux (Ubuntu Xenial)
     Assignee: (unassigned) => Joseph Salisbury (jsalisbury)

** Changed in: linux (Ubuntu Wily)
     Assignee: (unassigned) => Joseph Salisbury (jsalisbury)

** Changed in: linux (Ubuntu Trusty)
     Assignee: (unassigned) => Joseph Salisbury (jsalisbury)

** Changed in: linux (Ubuntu Xenial)
       Status: Triaged => In Progress

** Changed in: linux (Ubuntu Wily)
       Status: Triaged => In Progress

** Changed in: linux (Ubuntu Xenial)
       Status: In Progress => Fix Released

** Changed in: linux (Ubuntu Wily)
       Status: In Progress => Fix Released

** Changed in: linux (Ubuntu Wily)
       Status: Fix Released => In Progress

** Changed in: linux (Ubuntu Xenial)
       Status: Fix Released => In Progress

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https://bugs.launchpad.net/bugs/1549601

Title:
  [Hyper-V] x86,pageattr: prevent overflow in slow_virt_to_phys() for
  X86_PAE

Status in linux package in Ubuntu:
  In Progress
Status in linux source package in Trusty:
  Triaged
Status in linux source package in Wily:
  In Progress
Status in linux source package in Xenial:
  In Progress

Bug description:
  https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=d1cd1210834649ce1ca6bafe5ac25d2f40331343

  x86, pageattr: Prevent overflow in slow_virt_to_phys() for X86_PAE
  pte_pfn() returns a PFN of long (32 bits in 32-PAE), so "long <<
  PAGE_SHIFT" will overflow for PFNs above 4GB.

  Due to this issue, some Linux 32-PAE distros, running as guests on Hyper-V,
  with 5GB memory assigned, can't load the netvsc driver successfully and
  hence the synthetic network device can't work (we can use the kernel parameter
  mem=3000M to work around the issue).

  Cast pte_pfn() to phys_addr_t before shifting.

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