linux-kernel - Re: [PATCH] hwrng: geode: fix accessing registers

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Date:   Fri, 15 Sep 2023 18:46:34 +0800
From:   Herbert Xu <herbert@...dor.apana.org.au>
To:     Jonas Gorski <jonas.gorski@...il.com>
Cc:     Andres Salomon <dilinger@...ued.net>,
        Olivia Mackall <olivia@...enic.com>,
        Xiongfeng Wang <wangxiongfeng2@...wei.com>,
        "Timur I . Davletshin" <timur.davletshin@...il.com>,
        Jo-Philipp Wich <jo@...n.io>, linux-geode@...ts.infradead.org,
        linux-crypto@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] hwrng: geode: fix accessing registers

On Sun, Sep 10, 2023 at 10:34:17AM +0200, Jonas Gorski wrote:
> When the membase and pci_dev pointer were moved to a new struct in priv,
> the actual membase users were left untouched, and they started reading
> out arbitrary memory behind the struct instead of registers. This
> unfortunately turned the RNG into a constant number generator, depending
> on the content of what was at that offset.
> 
> To fix this, update geode_rng_data_{read,present}() to also get the
> membase via amd_geode_priv, and properly read from the right addresses
> again.
> 
> Fixes: 9f6ec8dc574e ("hwrng: geode - Fix PCI device refcount leak")
> Reported-by: Timur I. Davletshin <timur.davletshin@...il.com>
> Closes: https://bugzilla.kernel.org/show_bug.cgi?id=217882
> Tested-by: Timur I. Davletshin <timur.davletshin@...il.com>
> Suggested-by: Jo-Philipp Wich <jo@...n.io>
> Signed-off-by: Jonas Gorski <jonas.gorski@...il.com>
> ---
>  drivers/char/hw_random/geode-rng.c | 6 ++++--
>  1 file changed, 4 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