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[Bug 1326367] Re: exploitable futex vulnerability

To: kernel-packages@xxxxxxxxxxxxxxxxxxx
From: John Johansen <john.johansen@xxxxxxxxxxxxx>
Date: Sat, 07 Jun 2014 01:04:18 -0000
Reply-to: Bug 1326367 <1326367@xxxxxxxxxxxxxxxxxx>
Sender: bounces@xxxxxxxxxxxxx
** Changed in: linux-ec2 (Ubuntu Lucid)
       Status: New => Fix Released

** Changed in: linux (Ubuntu Utopic)
       Status: Confirmed => Fix Committed

** Description changed:

  If uaddr == uaddr2, then we have broken the rule of only requeueing from
  a non-pi futex to a pi futex with this call. If we attempt this, then
  dangling pointers may be left for rt_waiter resulting in an exploitable
  condition.
  
- Break-Fix: 52400ba946759af28442dee6265c5c0180ac7122 -
+ Break-Fix: 52400ba946759af28442dee6265c5c0180ac7122 54a217887a7b658e2650c3feff22756ab80c7339
+ Break-Fix: 52400ba946759af28442dee6265c5c0180ac7122 13fbca4c6ecd96ec1a1cfa2e4f2ce191fe928a5e
+ Break-Fix: 52400ba946759af28442dee6265c5c0180ac7122 b3eaa9fc5cd0a4d74b18f6b8dc617aeaf1873270
+ Break-Fix: 52400ba946759af28442dee6265c5c0180ac7122 e9c243a5a6de0be8e584c604d353412584b592f8

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https://bugs.launchpad.net/bugs/1326367

Title:
  exploitable futex vulnerability

Status in “linux” package in Ubuntu:
  Fix Committed
Status in “linux-armadaxp” package in Ubuntu:
  Invalid
Status in “linux-ec2” package in Ubuntu:
  Invalid
Status in “linux-fsl-imx51” package in Ubuntu:
  Invalid
Status in “linux-lts-quantal” package in Ubuntu:
  Invalid
Status in “linux-lts-raring” package in Ubuntu:
  Invalid
Status in “linux-lts-saucy” package in Ubuntu:
  Invalid
Status in “linux-mvl-dove” package in Ubuntu:
  Invalid
Status in “linux-ti-omap4” package in Ubuntu:
  Invalid
Status in “linux” source package in Lucid:
  Fix Released
Status in “linux-armadaxp” source package in Lucid:
  Invalid
Status in “linux-ec2” source package in Lucid:
  Fix Released
Status in “linux-fsl-imx51” source package in Lucid:
  Invalid
Status in “linux-lts-quantal” source package in Lucid:
  Invalid
Status in “linux-lts-raring” source package in Lucid:
  Invalid
Status in “linux-lts-saucy” source package in Lucid:
  Invalid
Status in “linux-mvl-dove” source package in Lucid:
  Invalid
Status in “linux-ti-omap4” source package in Lucid:
  Invalid
Status in “linux” source package in Precise:
  Fix Released
Status in “linux-armadaxp” source package in Precise:
  Fix Released
Status in “linux-ec2” source package in Precise:
  Invalid
Status in “linux-fsl-imx51” source package in Precise:
  Invalid
Status in “linux-lts-quantal” source package in Precise:
  Fix Released
Status in “linux-lts-raring” source package in Precise:
  Fix Released
Status in “linux-lts-saucy” source package in Precise:
  Fix Released
Status in “linux-mvl-dove” source package in Precise:
  Invalid
Status in “linux-ti-omap4” source package in Precise:
  Fix Released
Status in “linux” source package in Saucy:
  Fix Released
Status in “linux-armadaxp” source package in Saucy:
  Invalid
Status in “linux-ec2” source package in Saucy:
  Invalid
Status in “linux-fsl-imx51” source package in Saucy:
  Invalid
Status in “linux-lts-quantal” source package in Saucy:
  Invalid
Status in “linux-lts-raring” source package in Saucy:
  Invalid
Status in “linux-lts-saucy” source package in Saucy:
  Invalid
Status in “linux-mvl-dove” source package in Saucy:
  Invalid
Status in “linux-ti-omap4” source package in Saucy:
  New
Status in “linux” source package in Trusty:
  Fix Released
Status in “linux-armadaxp” source package in Trusty:
  Invalid
Status in “linux-ec2” source package in Trusty:
  Invalid
Status in “linux-fsl-imx51” source package in Trusty:
  Invalid
Status in “linux-lts-quantal” source package in Trusty:
  Invalid
Status in “linux-lts-raring” source package in Trusty:
  Invalid
Status in “linux-lts-saucy” source package in Trusty:
  Invalid
Status in “linux-mvl-dove” source package in Trusty:
  Invalid
Status in “linux-ti-omap4” source package in Trusty:
  Invalid
Status in “linux” source package in Utopic:
  Fix Committed
Status in “linux-armadaxp” source package in Utopic:
  Invalid
Status in “linux-ec2” source package in Utopic:
  Invalid
Status in “linux-fsl-imx51” source package in Utopic:
  Invalid
Status in “linux-lts-quantal” source package in Utopic:
  Invalid
Status in “linux-lts-raring” source package in Utopic:
  Invalid
Status in “linux-lts-saucy” source package in Utopic:
  Invalid
Status in “linux-mvl-dove” source package in Utopic:
  Invalid
Status in “linux-ti-omap4” source package in Utopic:
  Invalid

Bug description:
  If uaddr == uaddr2, then we have broken the rule of only requeueing
  from a non-pi futex to a pi futex with this call. If we attempt this,
  then dangling pointers may be left for rt_waiter resulting in an
  exploitable condition.

  Break-Fix: 52400ba946759af28442dee6265c5c0180ac7122 54a217887a7b658e2650c3feff22756ab80c7339
  Break-Fix: 52400ba946759af28442dee6265c5c0180ac7122 13fbca4c6ecd96ec1a1cfa2e4f2ce191fe928a5e
  Break-Fix: 52400ba946759af28442dee6265c5c0180ac7122 b3eaa9fc5cd0a4d74b18f6b8dc617aeaf1873270
  Break-Fix: 52400ba946759af28442dee6265c5c0180ac7122 e9c243a5a6de0be8e584c604d353412584b592f8

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