netdev - Re: [net 1/1] tipc: initialize broadcast link stale counter correctly

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Message-Id: <20181015.220439.2254090460096435575.davem@davemloft.net>
Date:   Mon, 15 Oct 2018 22:04:39 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     jon.maloy@...csson.com
Cc:     netdev@...r.kernel.org, gordan.mihaljevic@...tech.com.au,
        tung.q.nguyen@...tech.com.au, hoang.h.le@...tech.com.au,
        canh.d.luu@...tech.com.au, ying.xue@...driver.com,
        tipc-discussion@...ts.sourceforge.net
Subject: Re: [net 1/1] tipc: initialize broadcast link stale counter
 correctly

From: Jon Maloy <jon.maloy@...csson.com>
Date: Thu, 11 Oct 2018 22:02:29 +0200

> In the commit referred to below we added link tolerance as an additional
> criteria for declaring broadcast transmission "stale" and resetting the
> unicast links to the affected node.
> 
> Unfortunately, this 'improvement' introduced two bugs, which each and
> one alone cause only limited problems, but combined lead to seemingly
> stochastic unicast link resets, depending on the amount of broadcast
> traffic transmitted.
> 
> The first issue, a missing initialization of the 'tolerance' field of
> the receiver broadcast link, was recently fixed by commit 047491ea334a
> ("tipc: set link tolerance correctly in broadcast link").
> 
> Ths second issue, where we omit to reset the 'stale_cnt' field of
> the same link after a 'stale' period is over, leads to this counter
> accumulating over time, and in the absence of the 'tolerance' criteria
> leads to the above described symptoms. This commit adds the missing
> initialization.
> 
> Fixes: a4dc70d46cf1 ("tipc: extend link reset criteria for stale packet
> retransmission")
> 
> Signed-off-by: Jon Maloy <jon.maloy@...csson.com>

Applied, thanks Jon.

In the future, please always make your Fixes: tag one single line no
matter how long it is.  And also do not separate it from other tags
like the signoff with empty lines.  All of the tags should be
collected together without any empty lines in between.

Thank you.