linux-kernel - Re: [PATCH v1] tools/hv: async name resolution in kvp

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: Windows password security audit tool. GUI, reports in PDF.

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

Message-ID: <87wocbagqc.fsf@vitty.brq.redhat.com>
Date:   Thu, 07 Nov 2019 15:44:27 +0100
From:   Vitaly Kuznetsov <vkuznets@...hat.com>
To:     Olaf Hering <olaf@...fle.de>
Cc:     "K. Y. Srinivasan" <kys@...rosoft.com>,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        Stephen Hemminger <sthemmin@...rosoft.com>,
        Sasha Levin <sashal@...nel.org>,
        "open list\:Hyper-V CORE AND DRIVERS" <linux-hyperv@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v1] tools/hv: async name resolution in kvp_daemon

Olaf Hering <olaf@...fle.de> writes:

> Am Thu, 07 Nov 2019 15:15:45 +0100
> schrieb Vitaly Kuznetsov <vkuznets@...hat.com>:
>
>> Looping forever with a permanent error is pretty unusual...
>
> That might be true, but how would you detect a permanent error?
> Just because the DNS server is gone for one hour does not mean it will be gone forever.

'man 3 getaddrinfo' lists the following:

       EAI_ADDRFAMILY
       EAI_AGAIN
       EAI_BADFLAGS
       EAI_FAIL
       EAI_FAMILY
       EAI_MEMORY
       EAI_NODATA
       EAI_NONAME
       EAI_SERVICE
       EAI_SOCKTYPE
       EAI_SYSTEM

I *think* what you're aiming at is EAI_AGAIN and EAI_FAIL, the rest
should probably terminate the resolver thread (e.g. AF_INET is
unsupported or something like that).

-- 
Vitaly