linux-kernel - Re: [PATCH] bpf: fix possible spectre-v1 in find_and_alloc

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Date:   Thu, 03 May 2018 12:48:47 -0400 (EDT)
From:   David Miller <davem@...emloft.net>
To:     mark.rutland@....com
Cc:     linux-kernel@...r.kernel.org, ast@...nel.org,
        dan.carpenter@...cle.com, daniel@...earbox.net,
        peterz@...radead.org, netdev@...r.kernel.org
Subject: Re: [PATCH] bpf: fix possible spectre-v1 in find_and_alloc_map()

From: Mark Rutland <mark.rutland@....com>
Date: Thu,  3 May 2018 17:04:59 +0100

> It's possible for userspace to control attr->map_type. Sanitize it when
> using it as an array index to prevent an out-of-bounds value being used
> under speculation.
> 
> Found by smatch.
> 
> Signed-off-by: Mark Rutland <mark.rutland@....com>

Acked-by: David S. Miller <davem@...emloft.net>