linux-kernel - Re: [PATCH] crypto: do not free algorithm before using

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Message-ID: <20181129082908.ao3uxs4q5bncbctn@gondor.apana.org.au>
Date:   Thu, 29 Nov 2018 16:29:08 +0800
From:   Herbert Xu <herbert@...dor.apana.org.au>
To:     PanBian <bianpan2016@....com>
Cc:     "David S. Miller" <davem@...emloft.net>,
        linux-crypto@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] crypto: do not free algorithm before using

On Thu, Nov 29, 2018 at 03:47:56PM +0800, PanBian wrote:
> On Thu, Nov 29, 2018 at 02:57:11PM +0800, Herbert Xu wrote:
> > On Thu, Nov 22, 2018 at 06:00:16PM +0800, Pan Bian wrote:
> > > In multiple functions, the algorithm fields are read after its reference
> > > is dropped through crypto_mod_put. In this case, the algorithm memory
> > > may be freed, resulting in use-after-free bugs. This patch delays the
> > > put operation until the algorithm is never used.
> > > 
> > > Signed-off-by: Pan Bian <bianpan2016@....com>
> > 
> > Patch applied.  Thanks!
> > 
> > BTW, this problem exists in almost every other skcipher template,
> > e.g., in ctr.  Are you working on a fix for them too?
> 
> Probably not. Could you please provide patches to fix them?

OK, I'll work on it then.

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