linux-kernel - Re: [PATCH v2] crypto: marvell/octeontx

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Date:   Fri, 30 Sep 2022 14:14:01 +0800
From:   Herbert Xu <herbert@...dor.apana.org.au>
To:     Dan Carpenter <dan.carpenter@...cle.com>
Cc:     Boris Brezillon <bbrezillon@...nel.org>,
        Arnaud Ebalard <arno@...isbad.org>,
        Srujana Challa <schalla@...vell.com>,
        "David S. Miller" <davem@...emloft.net>,
        Wolfram Sang <wsa+renesas@...g-engineering.com>,
        Giovanni Cabiddu <giovanni.cabiddu@...el.com>,
        Lukasz Bartosik <lbartosik@...vell.com>,
        linux-crypto@...r.kernel.org, linux-kernel@...r.kernel.org,
        kernel-janitors@...r.kernel.org
Subject: Re: [PATCH v2] crypto: marvell/octeontx - prevent integer overflows

On Mon, Sep 19, 2022 at 09:43:19AM +0300, Dan Carpenter wrote:
> The "code_length" value comes from the firmware file.  If your firmware
> is untrusted realistically there is probably very little you can do to
> protect yourself.  Still we try to limit the damage as much as possible.
> Also Smatch marks any data read from the filesystem as untrusted and
> prints warnings if it not capped correctly.
> 
> The "code_length * 2" can overflow.  The round_up(ucode_size, 16) +
> sizeof() expression can overflow too.  Prevent these overflows.
> 
> Fixes: d9110b0b01ff ("crypto: marvell - add support for OCTEON TX CPT engine")
> Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
> ---
> v2: In the first commit, I accidentally added some unnecessary checks.
>     Those were only drafts and I sent them uninitentionally.  Sorry!
> 
>  .../crypto/marvell/octeontx/otx_cptpf_ucode.c  | 18 ++++++++++++++++--
>  1 file changed, 16 insertions(+), 2 deletions(-)

Patch applied.  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