linux-kernel - Re: REGRESSION (?) (Re: [PATCH] net: af_key: add check for pfkey_broadcast in function pfkey

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Message-ID: <20220523083349.zzgdmoq2bzstxla6@lion.mk-sys.cz>
Date:   Mon, 23 May 2022 10:33:49 +0200
From:   Michal Kubecek <mkubecek@...e.cz>
To:     Jiasheng Jiang <jiasheng@...as.ac.cn>
Cc:     steffen.klassert@...unet.com, herbert@...dor.apana.org.au,
        davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
        pabeni@...hat.com, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: REGRESSION (?) (Re: [PATCH] net: af_key: add check for
 pfkey_broadcast in function pfkey_process)

On Mon, May 23, 2022 at 04:24:38AM +0200, Michal Kubecek wrote:
> After upgrading from 5.18-rc7 to 5.18 final, my racoon daemon refuses to
> start because it cannot find some algorithms (it says "aes"). I have not
> finished the debugging completely but this patch, mainline commit
> 4dc2a5a8f675 ("net: af_key: add check for pfkey_broadcast in function
> pfkey_process"), seems to be the most promising candidate.

Tested now, reverting commit 4dc2a5a8f675 ("net: af_key: add check for
pfkey_broadcast in function pfkey_process") seems to fix the issue,
after rebuilding the af_key module with this commit reverted and
reloading it, racoon daemon starts and works and /proc/crypto shows
algrorithms it did not without the revert.

We might get away with changing the test to

	if (err && err != -ESRCH)
		return err;

but I'm not sure if bailing up on failed notification broadcast is
really what we want. Also, most other calling sites of pfkey_broadcast()
do not check the return value either so if we want to add the check, it
should probably be done more consistently. So for now, a revert is IMHO
more appropriate.

Michal

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