linux-kernel - Re: [PATCH v2] crypto: AF_ALG - race-free access of encryption flag

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Message-ID: <2034920.efhAd224kL@positron.chronox.de>
Date:   Wed, 29 Nov 2017 12:05:13 +0100
From:   Stephan Müller <smueller@...onox.de>
To:     Herbert Xu <herbert@...dor.apana.org.au>
Cc:     Eric Biggers <ebiggers3@...il.com>,
        syzbot 
        <bot+3401d9494b9380f7244bcc7fec49680878fccba6@...kaller.appspotmail.com>,
        davem@...emloft.net, linux-crypto@...r.kernel.org,
        linux-kernel@...r.kernel.org, syzkaller-bugs@...glegroups.com
Subject: Re: [PATCH v2] crypto: AF_ALG - race-free access of encryption flag

Am Mittwoch, 29. November 2017, 08:10:49 CET schrieb Herbert Xu:

Hi Herbert,

> 
> It sort of worked for skcipher because it didn't care if ctx->enc
> or even ctx->iv changed midstream.  But even there I don't think
> we need to wait a second time.  In fact waiting a second time could
> result in a dead-lock if no sendmsg call came around.

Shouldn't we then create a patch for the pre-4.14 algif_skcipher code that 
moves the wait out of the while loop to the beginning of the function in 
recvmsg?

Ciao
Stephan