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

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Message-ID: <20181129074756.GA73370@bp>
Date:   Thu, 29 Nov 2018 15:47:56 +0800
From:   PanBian <bianpan2016@....com>
To:     Herbert Xu <herbert@...dor.apana.org.au>
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 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?

Thanks,
Pan

> 
> 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