linux-kernel - Re: [PATCH 2/4] crypto: drbg wait for crypto op not signal safe

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Message-ID: <20170518050933.GA32409@gondor.apana.org.au>
Date:   Thu, 18 May 2017 13:09:34 +0800
From:   Herbert Xu <herbert@...dor.apana.org.au>
To:     Gilad Ben-Yossef <gilad@...yossef.com>
Cc:     "David S. Miller" <davem@...emloft.net>,
        Jonathan Corbet <corbet@....net>,
        David Howells <dhowells@...hat.com>,
        Ofir Drang <ofir.drang@....com>,
        Gilad Ben-Yossef <gilad.benyossef@....com>,
        Eric Biggers <ebiggers3@...il.com>, stable@...r.kernel.org,
        linux-crypto@...r.kernel.org, linux-doc@...r.kernel.org,
        linux-kernel@...r.kernel.org, keyrings@...r.kernel.org
Subject: Re: [PATCH 2/4] crypto: drbg wait for crypto op not signal safe

On Thu, May 11, 2017 at 02:53:43PM +0300, Gilad Ben-Yossef wrote:
> drbg_kcapi_sym_ctr() was using wait_for_completion_interruptible() to
> wait for completion of async crypto op but if a signal occurs it
> may return before DMA ops of HW crypto provider finish, thus
> corrupting the output buffer.
> 
> Resolve this by using wait_for_completion() instead.
> 
> Reported-by: Eric Biggers <ebiggers3@...il.com>
> Signed-off-by: Gilad Ben-Yossef <gilad@...yossef.com>
> CC: stable@...r.kernel.org

This patch doesn't even compile.  Please test your work first.

Thanks,
-- 
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