linux-kernel - Re: [PATCH net-next 0/4] net: ipa: kill IPA

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: <07765bd2-eade-ee52-fa18-56f2e573461a@linaro.org>
Date:   Tue, 27 Jul 2021 08:40:42 -0500
From:   Alex Elder <elder@...aro.org>
To:     Leon Romanovsky <leon@...nel.org>
Cc:     davem@...emloft.net, kuba@...nel.org, bjorn.andersson@...aro.org,
        evgreen@...omium.org, cpratapa@...eaurora.org,
        subashab@...eaurora.org, elder@...nel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next 0/4] net: ipa: kill IPA_VALIDATION

On 7/27/21 7:56 AM, Leon Romanovsky wrote:
>> In any case I take your point.  I will now add to my task list
>> a review of these spots.  I'd like to be sure an error message
>> *is*  reported at an appropriate level up the chain of callers so
>> I can always identify the culprit in the a WARN_ON() fires (even
>> though it should never
>>   happen).  And in each case I'll evaluate
>> whether returning is better than not.
> You can, but users don't :). So if it is valid but error flow, that
> needs user awareness, simply print something to the dmesg with *_err()
> prints.

For some reason you seem to care about users.

I guess the WARN stack trace tells me where it comes from.
This would be an invalid error flow, and should never happen.

I'll still plan to review each of these again.

> BTW, I'm trying to untangle some of the flows in net/core/devlink.c
> and such if(WARN()) pattern is even harmful, because it is very hard to
> understand when that error is rare/non-exist/real.

That's what assert() is for, but we've already had that
discussion :)

					-Alex