Note: This bug is displayed in read-only format because
the product is no longer active in Red Hat Bugzilla.
RHEL Engineering is moving the tracking of its product development work on RHEL 6 through RHEL 9 to Red Hat Jira (issues.redhat.com). If you're a Red Hat customer, please continue to file support cases via the Red Hat customer portal. If you're not, please head to the "RHEL project" in Red Hat Jira and file new tickets here. Individual Bugzilla bugs in the statuses "NEW", "ASSIGNED", and "POST" are being migrated throughout September 2023. Bugs of Red Hat partners with an assigned Engineering Partner Manager (EPM) are migrated in late September as per pre-agreed dates. Bugs against components "kernel", "kernel-rt", and "kpatch" are only migrated if still in "NEW" or "ASSIGNED". If you cannot log in to RH Jira, please consult article #7032570. That failing, please send an e-mail to the RH Jira admins at rh-issues@redhat.com to troubleshoot your issue as a user management inquiry. The email creates a ServiceNow ticket with Red Hat. Individual Bugzilla bugs that are migrated will be moved to status "CLOSED", resolution "MIGRATED", and set with "MigratedToJIRA" in "Keywords". The link to the successor Jira issue will be found under "Links", have a little "two-footprint" icon next to it, and direct you to the "RHEL project" in Red Hat Jira (issue links are of type "https://issues.redhat.com/browse/RHEL-XXXX", where "X" is a digit). This same link will be available in a blue banner at the top of the page informing you that that bug has been migrated.
*** Bug 1205573 has been marked as a duplicate of this bug. ***
Comment 11Dave Wysochanski
2016-06-22 15:28:23 UTC
I'm not sure about a hotfix for this bug. The first patch header states it is 'experimental'. Are we sure these 3 patches won't have side-effects? I have not reviewed the 3 patches carefully in detail.
Might be more appropriate for a Z-stream. SteveD - what do you think - should these be safe or do we need some QE before releasing?
commit e4569a0961ff9f059b9ae71327d291cf95399597
Author: Bodo Stroesser <bstroesser.com>
Date: Wed Nov 12 09:43:29 2014 -0500
rpc.mountd: set libtirpc nonblocking mode to avoid DOS
This patch is experimental. In works fine in that it removes the
vulnerability against a DOS attack. rpc.mountd can be blocked by
a bad client, that sends many RPC requests but never reads the
responses. This might happen intentionally or caused by a wrong
network config (MTU). The patch switches on the nonblocking
mode of libtirpc. In that mode writes can block for a max of 2 seconds.
Attackers are forced to send requests slower, as libtirpc will close
a connection if it finds two requests to read at the same time.
Reviewed-by: NeilBrown <neilb>
Signed-off-by: Bodo Stroesser <bstroesser.com>
Signed-off-by: Steve Dickson <steved>
(In reply to Dave Wysochanski from comment #11)
> I'm not sure about a hotfix for this bug. The first patch header states it
> is 'experimental'. Are we sure these 3 patches won't have side-effects? I
> have not reviewed the 3 patches carefully in detail.
>
> Might be more appropriate for a Z-stream. SteveD - what do you think -
> should these be safe or do we need some QE before releasing?
>
> commit e4569a0961ff9f059b9ae71327d291cf95399597
> Author: Bodo Stroesser <bstroesser.com>
> Date: Wed Nov 12 09:43:29 2014 -0500
>
> rpc.mountd: set libtirpc nonblocking mode to avoid DOS
>
Its been in place for a number of years and its in RHEL 7
so I'm thinking the three are fairly stable.
I agree with going through the Z-stream process allowing
QE to do some testing...
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.
For information on the advisory, and where to find the updated
files, follow the link below.
If the solution does not work for you, open a new bug report.
https://rhn.redhat.com/errata/RHBA-2017-0741.html