Re: SELinux and postfix

From: Victor Duchovni (no email)
Date: Tue Apr 08 2008 - 13:38:05 EDT

  • Next message: (no email): "Problem with spammers"

    On Tue, Apr 08, 2008 at 01:23:18PM -0400, Victor Duchovni wrote:

    > It would be rather ironic if (as I suspect) the security policy
    > is tripping on file close() operations, with master(8) carefully
    > relinquishing access to random open files it is invoked with.
    > Perhaps processes running under KDE have an extra file descriptor
    > inherited from the desktop environment.
    > The postfix(1) program does not close "high" descriptors, it just sanitizes
    > stdin/stdout/stderr, so master(8) may briefly see additional descriptors
    > from the parent execution environment.

    To test this hypothesis, try the following in a desktop terminal window
    (presumably you were starting Postfix from such a window) running /bin/sh
    or /bin/bash, .. not a CSH derivative.

      # (sleep 2 & lsof -p $! ; wait) 2>/dev/null

    I get:

      sleep 20258 root cwd DIR 8,1 4096 192593 /root
      sleep 20258 root rtd DIR 8,1 4096 2 /
      sleep 20258 root txt REG 8,1 12508 224533 /bin/sleep
      sleep 20258 root mem REG 8,1 106912 112445 /lib/
      sleep 20258 root mem REG 8,1 97712 272691 /lib/tls/
      sleep 20258 root mem REG 8,1 1571692 272692 /lib/tls/
      sleep 20258 root mem REG 8,1 47024 272694 /lib/tls/
      sleep 20258 root mem REG 8,1 213484 272693 /lib/tls/
      sleep 20258 root 0u CHR 136,23 25 /dev/pts/23
      sleep 20258 root 1u CHR 136,23 25 /dev/pts/23
      sleep 20258 root 2u CHR 136,23 25 /dev/pts/23

    So my "sleep" has just the 3 standard file descriptors. Likely yours has more.

    Disclaimer: off-list followups get on-list replies or get ignored.
    Please do not ignore the "Reply-To" header.
    To unsubscribe from the postfix-users list, visit or click the link below:
    If my response solves your problem, the best way to thank me is to not
    send an "it worked, thanks" follow-up. If you must respond, please put
    "It worked, thanks" in the "Subject" so I can delete these quickly.

  • Next message: (no email): "Problem with spammers"

    Hosted Email Solutions

    Invaluement Anti-Spam DNSBLs

    Powered By FreeBSD   Powered By FreeBSD