netdev - Re: [PATCH V2] Fix a sleep-in-atomic bug in shash_setkey

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Message-ID: <20171005101620.GA1246@gondor.apana.org.au>
Date:   Thu, 5 Oct 2017 18:16:20 +0800
From:   Herbert Xu <herbert@...dor.apana.org.au>
To:     David Miller <davem@...emloft.net>
Cc:     marcelo.leitner@...il.com, luto@...nel.org, baijiaju1990@....com,
        nhorman@...driver.com, vyasevich@...il.com, kvalo@...eaurora.org,
        linux-crypto@...r.kernel.org, netdev@...r.kernel.org,
        linux-sctp@...r.kernel.org, linux-wireless@...r.kernel.org
Subject: Re: [PATCH V2] Fix a sleep-in-atomic bug in shash_setkey_unaligned

On Wed, Oct 04, 2017 at 09:37:58PM -0700, David Miller wrote:
>
> > I'm not talking about the code-path in question.  I'm talking
> > about the function which generates the secret key in the first
> > place.  AFAICS that's only called in GFP_KERNEL context.  What
> > am I missing?
> 
> The setkey happens in functions like sctp_pack_cookie() and
> sctp_unpack_cookie(), which seems to run from software interrupts.

That was my point.  Functions like sctp_pack_cookie shouldn't be
setting the key in the first place.  The setkey should happen at
the point when the key is generated.  That's sctp_endpoint_init
which AFAICS only gets called in GFP_KERNEL context.

Or is there a code-path where sctp_endpoint_init is called in
softirq context?

Cheers,
-- 
Email: Herbert Xu <herbert@...dor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt