[Bug 1274444] Re: echo string to /dev/kmsg fails to appear on /var/log/syslog

[Simon Déziel]

The verification on Precise was done using the linux-image-generic-lts-
trusty kernel.


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

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https://bugs.launchpad.net/bugs/1274444

Title:
  echo string to /dev/kmsg fails to appear on /var/log/syslog

Status in “linux” package in Ubuntu:
  Invalid
Status in “rsyslog” package in Ubuntu:
  Fix Released
Status in “rsyslog” source package in Precise:
  Fix Committed
Status in “rsyslog” source package in Trusty:
  Fix Committed

Bug description:
  [Impact]
  In the precise 3.2 series kernel writing strings to /dev/kmsg appears and dmesg and /var/log/syslog, in 3.5 series kernel this does not happen properly even with the equivalent userspace packages.

  This is because the default facility number in the kernel has changed
  from 0 to 1 for user-space generated kmsg entries. Because of this;
  rsyslog (or any affected sysloggers) need to accept non-kernel
  facility numbers.

  This change was introduced by this commit (in the linux kernel):
  7ff9554bb578ba02166071d2d487b7fc7d860d62

  [Test Case]
  Run the following script as root:

  #!/bin/bash
  STRING=$(cat /dev/urandom | tr -dc 'a-zA-Z0-9' | head -c 32)
  # > /var/log/syslog # this isn't necessary
  echo $STRING > /dev/kmsg
  sleep 5
  grep $STRING /var/log/syslog
  # This should return 0.

  [Regression Potential]
  Any scripts that rely on syslog output may finally see output produced by packages like init/systemd show up in syslog. This changes the default rsyslog.conf file settings but isn't a code change.

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