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[Tim Gardner <tim.gardner@xxxxxxxxxxxxx>]

** Also affects: linux (Ubuntu Xenial)
   Importance: Undecided
       Status: Confirmed

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

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

** Changed in: linux (Ubuntu Xenial)
     Assignee: (unassigned) => Tim Gardner (timg-tpi)

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https://bugs.launchpad.net/bugs/1555353

Title:
  integer overflow in xt_alloc_table_info

Status in linux package in Ubuntu:
  In Progress
Status in linux source package in Wily:
  New
Status in linux source package in Xenial:
  In Progress

Bug description:
  [From https://code.google.com/p/google-security-
  research/issues/detail?id=758 ]

  A recent refactoring cof this codepath
  (https://github.com/torvalds/linux/commit/2e4e6a17af35be359cc8f1c924f8f198fbd478cc)
  introduced an integer overflow in xt_alloc_table_info, which on 32-bit
  systems can lead to small structure allocation and a copy_from_user
  based heap corruption.

  More specifically, the overflow may have been introduced in
  https://github.com/torvalds/linux/commit/711bdde6a884354ddae8da2fcb495b2a9364cc90
  ; specifically the bit:

    +       size_t sz = sizeof(*info) + size;

  (where size is an unsigned int passed from userspace).

  This issue should only affect 32bit platforms (xt_table_info.size is
  an unsigned int).

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