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[Luis Henriques <luis.henriques@xxxxxxxxxxxxx>]

I've been able to reproduce this issue in Lucid and I can confirm that
reverting the following commits actually fixes the problem:

d77028ffe1a3d6eb5f57c5e5ea87cbfc4ee05eb1 "net: check net.core.somaxconn sysctl values"
2dc19ed6338a27a78c7a9d47d311ae4ac5302c83 "sysctl net: Keep tcp_syn_retries inside the boundary"

So, although the fix proposed by Tyler in comment #3 could be the
correct fix for this regression, it has been decided to actually revert
the offending commits (as usual when a regression is found in an SRU).


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

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https://bugs.launchpad.net/bugs/1326473

Title:
  No /proc/sys/net/ipv4/tcp_syncookies present with 2.6.32-61-generic
  #123 in -proposed

Status in “linux” package in Ubuntu:
  Fix Committed

Bug description:
  The following security test failure is seen with the Platform QA
  Regression Testing task with 2.6.32-61-generic #123 kernel.

  06/04 15:06:05 ERROR|base_utils:0114| [stderr] 
  06/04 15:06:05 ERROR|base_utils:0114| [stderr] ======================================================================
  06/04 15:06:05 ERROR|base_utils:0114| [stderr] FAIL: SYN cookies is enabled
  06/04 15:06:05 ERROR|base_utils:0114| [stderr] ----------------------------------------------------------------------
  06/04 15:06:05 ERROR|base_utils:0114| [stderr] Traceback (most recent call last):
  06/04 15:06:05 ERROR|base_utils:0114| [stderr]   File "./test-kernel-security.py", line 359, in test_033_syn_cookies
  06/04 15:06:05 ERROR|base_utils:0114| [stderr]     self._test_sysctl_value('net/ipv4/tcp_syncookies', expected)
  06/04 15:06:05 ERROR|base_utils:0114| [stderr]   File "/home/ubuntu/autotest/client/tmp/ubuntu_qrt_kernel_security/src/scripts/testlib.py", line 1050, in _test_sysctl_value
  06/04 15:06:05 ERROR|base_utils:0114| [stderr]     self.assertEquals(exists, os.path.exists(sysctl), sysctl)
  06/04 15:06:05 ERROR|base_utils:0114| [stderr] AssertionError: /proc/sys/net/ipv4/tcp_syncookies

  Please see https://jenkins.qa.ubuntu.com/view/All/job/sru_kernel-
  lucid-
  generic_i386-amd_64-mga_g200ew/47/testReport/junit/autotest/ubuntu_qrt_kernel_security/test_kernel_security_py/
  for detailed logs.

  This can also be seen linux-ec2: 2.6.32-365.78 too.

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