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

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Message-ID: <20171005190713.GA4326@localhost.localdomain>
Date:   Thu, 5 Oct 2017 16:07:14 -0300
From:   Marcelo Ricardo Leitner <marcelo.leitner@...il.com>
To:     Herbert Xu <herbert@...dor.apana.org.au>
Cc:     David Miller <davem@...emloft.net>, 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 Thu, Oct 05, 2017 at 09:16:31PM +0800, Herbert Xu wrote:
> On Thu, Oct 05, 2017 at 06:16:20PM +0800, Herbert Xu wrote:
> >
> > 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?
> 
> OK, there are indeed code paths where the key is derived in softirq
> context.  Notably sctp_auth_calculate_hmac.
> 
> So I think this patch is the correct fix and I will push it upstream
> as well as back to stable.

Okay, thanks.

  Marcelo