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List:       oss-security
Subject:    Re: [oss-security] Security issue in Linux Kernel Keyring (CVE-2015-1333)
From:       Tyler Hicks <tyhicks () canonical ! com>
Date:       2015-07-28 17:26:33
Message-ID: 20150728172632.GA3132 () boyd
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On 2015-07-27 09:18:55, Tyler Hicks wrote:
> While improving the system call coverage in stress-ng[1], Colin Ian King
> discovered a bug in the Linux kernel keyring that can be used to cause a
> local denial of service due to memory exhaustion when the same key is
> repeatedly added to the kernel keyring via the add_key() syscall.
> 
> This issue has been assigned CVE-2015-1333.

mancha pinged me on IRC while trying to figure out what kernel versions
are affected and I realized that I forgot to include an import detail in
my original email.

The following commit introduced the issue:

  commit 034faeb9ef390d58239e1dce748143f6b35a0d9b
  Date:   Wed Oct 30 11:15:24 2013 +0000
  
      KEYS: Fix keyring quota misaccounting on key replacement and unlink

Which means that v3.13 and newer kernels are affected:

  $ git describe --contains 034faeb9ef390d58239e1dce748143f6b35a0d9b
  v3.13-rc1~18^2~6^2~2

Tyler

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