netdev - Re: [PATCH] mqprio: Fix out-of-bounds access in mqprio

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Message-Id: <20191206.115928.2012656428284544223.davem@davemloft.net>
Date:   Fri, 06 Dec 2019 11:59:28 -0800 (PST)
From:   David Miller <davem@...emloft.net>
To:     vladyslavt@...lanox.com
Cc:     netdev@...r.kernel.org
Subject: Re: [PATCH] mqprio: Fix out-of-bounds access in mqprio_dump

From: Vladyslav Tarasiuk <vladyslavt@...lanox.com>
Date: Fri, 6 Dec 2019 13:51:05 +0000

> When user runs a command like
> tc qdisc add dev eth1 root mqprio
> KASAN stack-out-of-bounds warning is emitted.
> Currently, NLA_ALIGN macro used in mqprio_dump provides too large
> buffer size as argument for nla_put and memcpy down the call stack.
> The flow looks like this:
> 1. nla_put expects exact object size as an argument;
> 2. Later it provides this size to memcpy;
> 3. To calculate correct padding for SKB, nla_put applies NLA_ALIGN
>    macro itself.
> 
> Therefore, NLA_ALIGN should not be applied to the nla_put parameter.
> Otherwise it will lead to out-of-bounds memory access in memcpy.
> 
> Fixes: 4e8b86c06269 ("mqprio: Introduce new hardware offload mode and shaper in mqprio")
> Signed-off-by: Vladyslav Tarasiuk <vladyslavt@...lanox.com>

Applied and queued up for -stable.