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

[Tim Gardner]

Not sure why this didn't close automatically. As far as I can tell
Xenial commit e728c9a3629770bc73bc2f884feeaf901801c28f ('x86/mm: Fix
slow_virt_to_phys() for X86_PAE again') was released in Ubuntu--
4.4.0-13.28

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

-- 
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
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:
  Fix Released
Status in linux source package in Trusty:
  Fix Released
Status in linux source package in Wily:
  Fix Released
Status in linux source package in Xenial:
  Fix Released

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.

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1549601/+subscriptions

-- 
Mailing list: https://launchpad.net/~kernel-packages
Post to : kernel-packages@lists.launchpad.net
Unsubscribe : https://launchpad.net/~kernel-packages
More help   : https://help.launchpad.net/ListHelp

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

[Chris Valean]

Will these patches be released in final 16.04?

I see that commit bf70e5513dfea29c3682e7eb3dbb45f0723bac09 is present in
the xenial kernel source.

-- 
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
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:
  Fix Committed
Status in linux source package in Trusty:
  Fix Released
Status in linux source package in Wily:
  Fix Released
Status in linux source package in Xenial:
  Fix Committed

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.

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1549601/+subscriptions

-- 
Mailing list: https://launchpad.net/~kernel-packages
Post to : kernel-packages@lists.launchpad.net
Unsubscribe : https://launchpad.net/~kernel-packages
More help   : https://help.launchpad.net/ListHelp

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

[Launchpad Bug Tracker]

This bug was fixed in the package linux - 3.13.0-85.129

---
linux (3.13.0-85.129) trusty; urgency=low

  [ Brad Figg ]

  * Release Tracking Bug
- LP: #1558727

  [ Upstream Kernel Changes ]

  * Revert "Revert "af_unix: Revert 'lock_interruptible' in stream receive
code""

linux (3.13.0-84.128) trusty; urgency=low

  [ Brad Figg ]

  * Release Tracking Bug
- LP: #1557596

  [ Upstream Kernel Changes ]

  * Revert "af_unix: Revert 'lock_interruptible' in stream receive code"
- LP: #1540731
  * seccomp: cap SECCOMP_RET_ERRNO data to MAX_ERRNO
- LP: #1496073
  * net/mlx4_en: Remove dependency between timestamping capability and
service_task
- LP: #1537859
  * net/mlx4_en: Fix HW timestamp init issue upon system startup
- LP: #1537859
  * x86/mm: Fix slow_virt_to_phys() for X86_PAE again
- LP: #1549601
  * iw_cxgb3: Fix incorrectly returning error on success
- LP: #1557191
  * EVM: Use crypto_memneq() for digest comparisons
- LP: #1557191
  * x86/entry/compat: Add missing CLAC to entry_INT80_32
- LP: #1557191
  * iio: dac: mcp4725: set iio name property in sysfs
- LP: #1557191
  * iommu/vt-d: Fix 64-bit accesses to 32-bit DMAR_GSTS_REG
- LP: #1557191
  * PCI/AER: Flush workqueue on device remove to avoid use-after-free
- LP: #1557191
  * libata: disable forced PORTS_IMPL for >= AHCI 1.3
- LP: #1557191
  * mac80211: start_next_roc only if scan was actually running
- LP: #1557191
  * mac80211: Requeue work after scan complete for all VIF types.
- LP: #1557191
  * rfkill: fix rfkill_fop_read wait_event usage
- LP: #1557191
  * crypto: shash - Fix has_key setting
- LP: #1557191
  * drm/i915/dp: fall back to 18 bpp when sink capability is unknown
- LP: #1557191
  * target: Fix WRITE_SAME/DISCARD conversion to linux 512b sectors
- LP: #1557191
  * crypto: algif_hash - wait for crypto_ahash_init() to complete
- LP: #1557191
  * iio: inkern: fix a NULL dereference on error
- LP: #1557191
  * intel_scu_ipcutil: underflow in scu_reg_access()
- LP: #1557191
  * ALSA: seq: Fix race at closing in virmidi driver
- LP: #1557191
  * ALSA: rawmidi: Remove kernel WARNING for NULL user-space buffer check
- LP: #1557191
  * ALSA: pcm: Fix potential deadlock in OSS emulation
- LP: #1557191
  * ALSA: seq: Fix yet another races among ALSA timer accesses
- LP: #1557191
  * ALSA: timer: Fix link corruption due to double start or stop
- LP: #1557191
  * libata: fix sff host state machine locking while polling
- LP: #1557191
  * cputime: Prevent 32bit overflow in time[val|spec]_to_cputime()
- LP: #1557191
  * ASoC: dpcm: fix the BE state on hw_free
- LP: #1557191
  * module: wrapper for symbol name.
- LP: #1557191
  * ALSA: hda - Add fixup for Mac Mini 7,1 model
- LP: #1557191
  * ALSA: Move EXPORT_SYMBOL() in appropriate places
- LP: #1557191
  * ALSA: rawmidi: Make snd_rawmidi_transmit() race-free
- LP: #1557191
  * ALSA: rawmidi: Fix race at copying & updating the position
- LP: #1557191
  * ALSA: seq: Fix lockdep warnings due to double mutex locks
- LP: #1557191
  * drivers/scsi/sg.c: mark VMA as VM_IO to prevent migration
- LP: #1557191
  * radix-tree: fix race in gang lookup
- LP: #1557191
  * usb: xhci: apply XHCI_PME_STUCK_QUIRK to Intel Broxton-M platforms
- LP: #1557191
  * xhci: Fix list corruption in urb dequeue at host removal
- LP: #1557191
  * target: Fix Task Aborted Status (TAS) handling
- LP: #1557191
  * target: Add TFO->abort_task for aborted task resources release
- LP: #1557191
  * target: Fix LUN_RESET active TMR descriptor handling
- LP: #1557191
  * target: Fix LUN_RESET active I/O handling for ACK_KREF
- LP: #1557191
  * target: Fix TAS handling for multi-session se_node_acls
- LP: #1557191
  * target: Fix remote-port TMR ABORT + se_cmd fabric stop
- LP: #1557191
  * target: Fix race with SCF_SEND_DELAYED_TAS handling
- LP: #1557191
  * [media] tda1004x: only update the frontend properties if locked
- LP: #1557191
  * ALSA: timer: Fix leftover link at closing
- LP: #1557191
  * [media] saa7134-alsa: Only frees registered sound cards
- LP: #1557191
  * Btrfs: fix hang on extent buffer lock caused by the inode_paths ioctl
- LP: #1557191
  * scsi_dh_rdac: always retry MODE SELECT on command lock violation
- LP: #1557191
  * SCSI: Add Marvell Console to VPD blacklist
- LP: #1557191
  * drm: Add drm_fixp_from_fraction and drm_fixp2int_ceil
- LP: #1557191
  * ALSA: hda - Fix static checker warning in patch_hdmi.c
- LP: #1557191
  * dump_stack: avoid potential deadlocks
- LP: #1557191
  * mm, vmstat: fix wrong WQ sleep when memory reclaim doesn't make any
progress
- LP: #1557191
  * ocfs2/dlm: clear refmap bit of recovery lock while doing local recovery
cleanup
- LP: #1557191
  * mm: replace vma_lock_anon_vma with anon_vma_lock_read/write
- LP: 

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

[Launchpad Bug Tracker]

This bug was fixed in the package linux - 4.2.0-35.40

---
linux (4.2.0-35.40) wily; urgency=low

  [ Brad Figg ]

  * Release Tracking Bug
- LP: #1557706

  [ Upstream Kernel Changes ]

  * Revert "workqueue: make sure delayed work run in local cpu"
- LP: #1556269
  * Revert "ALSA: hda - Fix noise on Gigabyte Z170X mobo"
- LP: #1556269
  * KVM: VMX: Fix host initiated access to guest MSR_TSC_AUX
- LP: #1552592
  * locking/qspinlock: Move __ARCH_SPIN_LOCK_UNLOCKED to qspinlock_types.h
- LP: #1545330
  * [media] usbvision fix overflow of interfaces array
- LP: #1556269
  * [media] usbvision: fix crash on detecting device with invalid
configuration
- LP: #1556269
  * ASN.1: Fix non-match detection failure on data overrun
- LP: #1556269
  * iw_cxgb3: Fix incorrectly returning error on success
- LP: #1556269
  * EVM: Use crypto_memneq() for digest comparisons
- LP: #1556269
  * vmstat: explicitly schedule per-cpu work on the CPU we need it to run
on
- LP: #1556269
  * x86/entry/compat: Add missing CLAC to entry_INT80_32
- LP: #1556269
  * iio-light: Use a signed return type for ltr501_match_samp_freq()
- LP: #1556269
  * iio: add IIO_TRIGGER dependency to STK8BA50
- LP: #1556269
  * iio: add HAS_IOMEM dependency to VF610_ADC
- LP: #1556269
  * iio: dac: mcp4725: set iio name property in sysfs
- LP: #1556269
  * iommu/vt-d: Fix 64-bit accesses to 32-bit DMAR_GSTS_REG
- LP: #1556269
  * iio: light: acpi-als: Report data as processed
- LP: #1556269
  * iio:adc:ti_am335x_adc Fix buffered mode by identifying as software
buffer.
- LP: #1556269
  * ASoC: rt5645: fix the shift bit of IN1 boost
- LP: #1556269
  * ARCv2: STAR 9000950267: Handle return from intr to Delay Slot #2
- LP: #1556269
  * cgroup: make sure a parent css isn't offlined before its children
- LP: #1556269
  * ARM: OMAP2+: Fix wait_dll_lock_timed for rodata
- LP: #1556269
  * ARM: OMAP2+: Fix l2dis_3630 for rodata
- LP: #1556269
  * ARM: OMAP2+: Fix save_secure_ram_context for rodata
- LP: #1556269
  * ARM: OMAP2+: Fix l2_inv_api_params for rodata
- LP: #1556269
  * ARM: OMAP2+: Fix ppa_zero_params and ppa_por_params for rodata
- LP: #1556269
  * rtlwifi: rtl8821ae: Fix 5G failure when EEPROM is incorrectly encoded
- LP: #1556269
  * PCI/AER: Flush workqueue on device remove to avoid use-after-free
- LP: #1556269
  * ARM: dts: Fix wl12xx missing clocks that cause hangs
- LP: #1556269
  * libata: disable forced PORTS_IMPL for >= AHCI 1.3
- LP: #1556269
  * mac80211: Requeue work after scan complete for all VIF types.
- LP: #1556269
  * rfkill: fix rfkill_fop_read wait_event usage
- LP: #1556269
  * ARM: dts: at91: sama5d4: fix instance id of DBGU
- LP: #1556269
  * ARM: dts: at91: sama5d4ek: add phy address and IRQ for macb0
- LP: #1556269
  * ARM: dts: at91: sama5d4 xplained: fix phy0 IRQ type
- LP: #1556269
  * crypto: shash - Fix has_key setting
- LP: #1556269
  * Input: vmmouse - fix absolute device registration
- LP: #1556269
  * spi: atmel: fix gpio chip-select in case of non-DT platform
- LP: #1556269
  * drm/i915/dp: fall back to 18 bpp when sink capability is unknown
- LP: #1556269
  * ALSA: usb-audio: Fix OPPO HA-1 vendor ID
- LP: #1556269
  * ALSA: usb-audio: Add native DSD support for PS Audio NuWave DAC
- LP: #1556269
  * ALSA: usb-audio: Add quirk for Microsoft LifeCam HD-6000
- LP: #1556269
  * target: Fix WRITE_SAME/DISCARD conversion to linux 512b sectors
- LP: #1556269
  * crypto: algif_hash - wait for crypto_ahash_init() to complete
- LP: #1556269
  * iio: inkern: fix a NULL dereference on error
- LP: #1556269
  * iio: pressure: mpl115: fix temperature offset sign
- LP: #1556269
  * intel_scu_ipcutil: underflow in scu_reg_access()
- LP: #1556269
  * ALSA: seq: Fix race at closing in virmidi driver
- LP: #1556269
  * ALSA: rawmidi: Remove kernel WARNING for NULL user-space buffer check
- LP: #1556269
  * ALSA: pcm: Fix potential deadlock in OSS emulation
- LP: #1556269
  * ALSA: seq: Fix yet another races among ALSA timer accesses
- LP: #1556269
  * ALSA: timer: Code cleanup
- LP: #1556269
  * ALSA: timer: Fix link corruption due to double start or stop
- LP: #1556269
  * libata: fix sff host state machine locking while polling
- LP: #1556269
  * MIPS: Fix buffer overflow in syscall_get_arguments()
- LP: #1556269
  * cputime: Prevent 32bit overflow in time[val|spec]_to_cputime()
- LP: #1556269
  * drm: add helper to check for wc memory support
- LP: #1556269
  * drm/radeon: mask out WC from BO on unsupported arches
- LP: #1556269
  * drm/amdgpu: mask out WC from BO on unsupported arches
- LP: #1556269
  * ASoC: dpcm: fix the BE state on hw_free
- LP: #1556269
  * drm/amdgpu: move gmc7 support out of CIK dependency
- LP: #1556269
  * drm/amdgpu: iceland use CI based 

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

[Chris Valean]

Verified this and confirmed as good with the following:

- Trusty - proposed kernel 3.13.0.85.91
- Wily - proposed kernel 4.2.0.35.38

** Tags removed: verification-needed-trusty verification-needed-wily
** Tags added: verification-done-trusty verification-done-wily

-- 
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
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:
  Fix Committed
Status in linux source package in Trusty:
  Fix Committed
Status in linux source package in Wily:
  Fix Committed
Status in linux source package in Xenial:
  Fix Committed

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.

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1549601/+subscriptions

-- 
Mailing list: https://launchpad.net/~kernel-packages
Post to : kernel-packages@lists.launchpad.net
Unsubscribe : https://launchpad.net/~kernel-packages
More help   : https://help.launchpad.net/ListHelp

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

[Kamal Mostafa]

This bug is awaiting verification that the kernel in -proposed solves
the problem. Please test the kernel and update this bug with the
results. If the problem is solved, change the tag 'verification-needed-
wily' to 'verification-done-wily'.

If verification is not done by 5 working days from today, this fix will
be dropped from the source code, and this bug will be closed.

See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how
to enable and use -proposed. Thank you!

-- 
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
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:
  Fix Committed
Status in linux source package in Trusty:
  Fix Committed
Status in linux source package in Wily:
  Fix Committed
Status in linux source package in Xenial:
  Fix Committed

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.

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1549601/+subscriptions

-- 
Mailing list: https://launchpad.net/~kernel-packages
Post to : kernel-packages@lists.launchpad.net
Unsubscribe : https://launchpad.net/~kernel-packages
More help   : https://help.launchpad.net/ListHelp

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

[Kamal Mostafa]

This bug is awaiting verification that the kernel in -proposed solves
the problem. Please test the kernel and update this bug with the
results. If the problem is solved, change the tag 'verification-needed-
trusty' to 'verification-done-trusty'.

If verification is not done by 5 working days from today, this fix will
be dropped from the source code, and this bug will be closed.

See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how
to enable and use -proposed. Thank you!


** Tags added: verification-needed-trusty

** Tags added: verification-needed-wily

-- 
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
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:
  Fix Committed
Status in linux source package in Trusty:
  Fix Committed
Status in linux source package in Wily:
  Fix Committed
Status in linux source package in Xenial:
  Fix Committed

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.

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1549601/+subscriptions

-- 
Mailing list: https://launchpad.net/~kernel-packages
Post to : kernel-packages@lists.launchpad.net
Unsubscribe : https://launchpad.net/~kernel-packages
More help   : https://help.launchpad.net/ListHelp

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

[Launchpad Bug Tracker]

** Branch linked: lp:ubuntu/trusty-proposed/linux-lts-wily

-- 
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
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:
  Fix Committed
Status in linux source package in Trusty:
  Fix Committed
Status in linux source package in Wily:
  Fix Committed
Status in linux source package in Xenial:
  Fix Committed

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.

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1549601/+subscriptions

-- 
Mailing list: https://launchpad.net/~kernel-packages
Post to : kernel-packages@lists.launchpad.net
Unsubscribe : https://launchpad.net/~kernel-packages
More help   : https://help.launchpad.net/ListHelp

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

[Tim Gardner]

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

-- 
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
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:
  Fix Committed
Status in linux source package in Trusty:
  Fix Committed
Status in linux source package in Wily:
  Fix Committed
Status in linux source package in Xenial:
  Fix Committed

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.

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1549601/+subscriptions

-- 
Mailing list: https://launchpad.net/~kernel-packages
Post to : kernel-packages@lists.launchpad.net
Unsubscribe : https://launchpad.net/~kernel-packages
More help   : https://help.launchpad.net/ListHelp

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

[Brad Figg]

** Changed in: linux (Ubuntu Trusty)
   Status: In Progress => Fix Committed

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

-- 
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
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:
  Fix Committed
Status in linux source package in Wily:
  Fix Committed
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.

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1549601/+subscriptions

-- 
Mailing list: https://launchpad.net/~kernel-packages
Post to : kernel-packages@lists.launchpad.net
Unsubscribe : https://launchpad.net/~kernel-packages
More help   : https://help.launchpad.net/ListHelp

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

[Joseph Salisbury]

I submitted the SRU request, which is prior to the March 11th cutoff, so
this fix should be in the next SRU cycle.

-- 
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
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:
  In Progress
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.

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1549601/+subscriptions

-- 
Mailing list: https://launchpad.net/~kernel-packages
Post to : kernel-packages@lists.launchpad.net
Unsubscribe : https://launchpad.net/~kernel-packages
More help   : https://help.launchpad.net/ListHelp

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

[Chris Valean]

Hi Joe,

Adrian is from my team and his test results are valid. Can you please confirm 
that this patch will be included in the March 11th SRUs?
Thank you!

-- 
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
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:
  In Progress
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.

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1549601/+subscriptions

-- 
Mailing list: https://launchpad.net/~kernel-packages
Post to : kernel-packages@lists.launchpad.net
Unsubscribe : https://launchpad.net/~kernel-packages
More help   : https://help.launchpad.net/ListHelp

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

[Adrian Suhov]

Hi!

I tested all three kernels on both WS2012R2 and WS2008R2 and I got good
results. Netvsc driver loaded successfully everytime with different
memory settings. You can merge the patches.

-- 
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
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:
  In Progress
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.

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1549601/+subscriptions

-- 
Mailing list: https://launchpad.net/~kernel-packages
Post to : kernel-packages@lists.launchpad.net
Unsubscribe : https://launchpad.net/~kernel-packages
More help   : https://help.launchpad.net/ListHelp

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

[Joseph Salisbury]

I also built a Wily and Trusty test kernel with commit bf70e551.  Those
kernels can be downloaded from:

Wily: http://kernel.ubuntu.com/~jsalisbury/lp1549601/wily

Trusty: http://kernel.ubuntu.com/~jsalisbury/lp1549601/trusty


Can you also test this kernels?  If we can receive positive test feedback by 
March 11th, we can proceed to submit the patches for kernel SRU review in an 
attempt to make the upcoming kernel SRU cycle starting on March 11th.  Assuming 
the patches are accepted for SRU and land in the upcoming SRU cycle, the fix 
should be available from the -updates pocket by April 2nd.

-- 
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
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:
  In Progress
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.

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1549601/+subscriptions

-- 
Mailing list: https://launchpad.net/~kernel-packages
Post to : kernel-packages@lists.launchpad.net
Unsubscribe : https://launchpad.net/~kernel-packages
More help   : https://help.launchpad.net/ListHelp

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

[Joseph Salisbury]

I built a Xenial test kernel with commit bf70e551.  The test kernel can
be downloaded from:

http://kernel.ubuntu.com/~jsalisbury/lp1549601/xenial/

Can you test this kernel and see if it resolves this bug?

I'm also building test kernels for Wily and Trusty.  The have slightly
different backports and have some prereqs.  I'll post a link to them
shortly.

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

-- 
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
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:
  In Progress
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.

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1549601/+subscriptions

-- 
Mailing list: https://launchpad.net/~kernel-packages
Post to : kernel-packages@lists.launchpad.net
Unsubscribe : https://launchpad.net/~kernel-packages
More help   : https://help.launchpad.net/ListHelp

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

[Joseph Salisbury]

** 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

-- 
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
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.

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1549601/+subscriptions

-- 
Mailing list: https://launchpad.net/~kernel-packages
Post to : kernel-packages@lists.launchpad.net
Unsubscribe : https://launchpad.net/~kernel-packages
More help   : https://help.launchpad.net/ListHelp

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

[Joseph Salisbury]

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

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

** Changed in: linux (Ubuntu Wily)
   Importance: Undecided => Medium

** Changed in: linux (Ubuntu Trusty)
   Importance: Undecided => Medium

-- 
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
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:
  Triaged
Status in linux source package in Trusty:
  Triaged
Status in linux source package in Wily:
  Triaged
Status in linux source package in Xenial:
  Triaged

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.

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1549601/+subscriptions

-- 
Mailing list: https://launchpad.net/~kernel-packages
Post to : kernel-packages@lists.launchpad.net
Unsubscribe : https://launchpad.net/~kernel-packages
More help   : https://help.launchpad.net/ListHelp

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

[Brad Figg]

** Also affects: linux (Ubuntu Xenial)
   Importance: Medium
   Status: Triaged

** Also affects: linux (Ubuntu Wily)
   Importance: Undecided
   Status: New

** Also affects: linux (Ubuntu Trusty)
   Importance: Undecided
   Status: New

-- 
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
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:
  Triaged
Status in linux source package in Trusty:
  New
Status in linux source package in Wily:
  New
Status in linux source package in Xenial:
  Triaged

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.

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1549601/+subscriptions

-- 
Mailing list: https://launchpad.net/~kernel-packages
Post to : kernel-packages@lists.launchpad.net
Unsubscribe : https://launchpad.net/~kernel-packages
More help   : https://help.launchpad.net/ListHelp

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

[Joshua R. Poulson]

Commit:
https://git.kernel.org/cgit/linux/kernel/git/tip/tip.git/commit/?id=bf70e5513dfea29c3682e7eb3dbb45f0723bac09

-- 
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
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:
  Triaged

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.

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1549601/+subscriptions

-- 
Mailing list: https://launchpad.net/~kernel-packages
Post to : kernel-packages@lists.launchpad.net
Unsubscribe : https://launchpad.net/~kernel-packages
More help   : https://help.launchpad.net/ListHelp

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

[Joshua R. Poulson]

I'm expecting an upstream fix for this problem soon, based on this
discussion (lkml):

>From Dexuan Cui:
"d1cd12108346: x86, pageattr: Prevent overflow in slow_virt_to_phys() for 
X86_PAE"
was unintentionally removed by the recent
"34437e67a672: x86/mm: Fix slow_virt_to_phys() to handle large PAT bit".

And, the variable 'phys_addr' was defined as "unsigned long" by mistake -- it 
should
be "phys_addr_t".

As a result, Hyper-V network driver in 32-PAE Linux guest can't work
again.

Fixes: "commmit 34437e67a672: x86/mm: Fix slow_virt_to_phys() to handle large 
PAT bit"
Signed-off-by: Dexuan Cui 
Cc: Toshi Kani 
Cc: Andrew Morton 
Cc: Thomas Gleixner 
Cc: K. Y. Srinivasan 
Cc: Haiyang Zhang 
Cc: gre...@linuxfoundation.org
Cc: linux...@kvack.org
Cc: o...@aepfle.de
Cc: a...@canonical.com
Cc: jasow...@redhat.com
Cc: sta...@vger.kernel.org
---
 arch/x86/mm/pageattr.c | 14 ++
 1 file changed, 10 insertions(+), 4 deletions(-)

diff --git a/arch/x86/mm/pageattr.c b/arch/x86/mm/pageattr.c
index 2440814..9cf96d8 100644
--- a/arch/x86/mm/pageattr.c
+++ b/arch/x86/mm/pageattr.c
@@ -419,24 +419,30 @@ pmd_t *lookup_pmd_address(unsigned long address)
 phys_addr_t slow_virt_to_phys(void *__virt_addr)
 {
unsigned long virt_addr = (unsigned long)__virt_addr;
-   unsigned long phys_addr, offset;
+   phys_addr_t phys_addr;
+   unsigned long offset;
enum pg_level level;
pte_t *pte;

pte = lookup_address(virt_addr, );
BUG_ON(!pte);

+   /*
+* pXX_pfn() returns unsigned long, which must be cast to phys_addr_t
+* before being left-shifted PAGE_SHIFT bits -- this trick is to
+* make 32-PAE kernel work correctly.
+*/
switch (level) {
case PG_LEVEL_1G:
-   phys_addr = pud_pfn(*(pud_t *)pte) << PAGE_SHIFT;
+   phys_addr = (phys_addr_t)pud_pfn(*(pud_t *)pte) << PAGE_SHIFT;
offset = virt_addr & ~PUD_PAGE_MASK;
break;
case PG_LEVEL_2M:
-   phys_addr = pmd_pfn(*(pmd_t *)pte) << PAGE_SHIFT;
+   phys_addr = (phys_addr_t)pmd_pfn(*(pmd_t *)pte) << PAGE_SHIFT;
offset = virt_addr & ~PMD_PAGE_MASK;
break;
default:
-   phys_addr = pte_pfn(*pte) << PAGE_SHIFT;
+   phys_addr = (phys_addr_t)pte_pfn(*pte) << PAGE_SHIFT;
offset = virt_addr & ~PAGE_MASK;
}

>From Toshi Kani:
On Thu, 2016-02-25 at 01:58 -0800, Dexuan Cui wrote:
> "d1cd12108346: x86, pageattr: Prevent overflow in slow_virt_to_phys() for
> X86_PAE"
> was unintentionally removed by the recent
> "34437e67a672: x86/mm: Fix slow_virt_to_phys() to handle large PAT bit".
>
> And, the variable 'phys_addr' was defined as "unsigned long" by mistake
> -- it should
> be "phys_addr_t".
>
> As a result, Hyper-V network driver in 32-PAE Linux guest can't work
> again.
>
> Fixes: "commmit 34437e67a672: x86/mm: Fix slow_virt_to_phys() to handle
> large PAT bit"
> Signed-off-by: Dexuan Cui 
> Cc: Toshi Kani 
> Cc: Andrew Morton 
> Cc: Thomas Gleixner 
> Cc: K. Y. Srinivasan 
> Cc: Haiyang Zhang 
> Cc: gre...@linuxfoundation.org
> Cc: linux...@kvack.org
> Cc: o...@aepfle.de
> Cc: a...@canonical.com
> Cc: jasow...@redhat.com
> Cc: sta...@vger.kernel.org

Thanks for the fix and adding the comment to explain the trick!  The change
looks good to me.

Reviewed-by: Toshi Kani 

-- 
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
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:
  Triaged

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.

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1549601/+subscriptions

-- 
Mailing list: https://launchpad.net/~kernel-packages
Post to : kernel-packages@lists.launchpad.net
Unsubscribe : https://launchpad.net/~kernel-packages
More help   : https://help.launchpad.net/ListHelp

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

[Joseph Salisbury]

** Tags added: kernel-da-key kernel-hyper-v

** Changed in: linux (Ubuntu)
   Importance: Undecided => Medium

** Changed in: linux (Ubuntu)
   Status: Confirmed => Triaged

-- 
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
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:
  Triaged

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.

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1549601/+subscriptions

-- 
Mailing list: https://launchpad.net/~kernel-packages
Post to : kernel-packages@lists.launchpad.net
Unsubscribe : https://launchpad.net/~kernel-packages
More help   : https://help.launchpad.net/ListHelp

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

[Joshua R. Poulson]

Thanks for your analysis Dexuan, I had not had a change to look at the
mainline differences yet.

-- 
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
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:
  Confirmed

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.

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1549601/+subscriptions

-- 
Mailing list: https://launchpad.net/~kernel-packages
Post to : kernel-packages@lists.launchpad.net
Unsubscribe : https://launchpad.net/~kernel-packages
More help   : https://help.launchpad.net/ListHelp

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

[Joshua R. Poulson]

Good catch Chris!

-- 
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
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:
  Confirmed

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.

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1549601/+subscriptions

-- 
Mailing list: https://launchpad.net/~kernel-packages
Post to : kernel-packages@lists.launchpad.net
Unsubscribe : https://launchpad.net/~kernel-packages
More help   : https://help.launchpad.net/ListHelp

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

[Chris Valean]

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

-- 
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
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:
  Confirmed

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.

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1549601/+subscriptions

-- 
Mailing list: https://launchpad.net/~kernel-packages
Post to : kernel-packages@lists.launchpad.net
Unsubscribe : https://launchpad.net/~kernel-packages
More help   : https://help.launchpad.net/ListHelp

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

[Dexuan Cui]

It turns out the issue also exists in the latest mainline kernel!

The fix "x86, pageattr: Prevent overflow in slow_virt_to_phys() for X86_PAE" is 
there, but a later patch "x86/mm: Fix slow_virt_to_phys() to handle large PAT 
bit"
 
(https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=34437e67a6727885bdf6cbfd8441b1ac43a1ee65)
 
actually removed the fix unintentionally, so we have the regression...

I have made a new fix and post it to LKML just now (sta...@vger.kernel.org was 
Cc-ed):
 http://marc.info/?l=linux-kernel=145638841908383=2

-- 
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
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:
  Incomplete

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.

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1549601/+subscriptions

-- 
Mailing list: https://launchpad.net/~kernel-packages
Post to : kernel-packages@lists.launchpad.net
Unsubscribe : https://launchpad.net/~kernel-packages
More help   : https://help.launchpad.net/ListHelp