netdev - Re: [PATCH bpf 5/9] bpf: restrict stack pointer arithmetic for unpriviledged

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Date:   Tue, 01 Jan 2019 13:20:36 -0800 (PST)
From:   David Miller <davem@...emloft.net>
To:     daniel@...earbox.net
Cc:     ast@...nel.org, jannh@...gle.com, netdev@...r.kernel.org
Subject: Re: [PATCH bpf 5/9] bpf: restrict stack pointer arithmetic for
 unpriviledged

From: Daniel Borkmann <daniel@...earbox.net>
Date: Tue,  1 Jan 2019 21:49:21 +0100

> Restrict stack pointer arithmetic for unpriviledged users in that
> arithmetic itself must not go out of bounds as opposed to the actual
> access later on. Therefore after each adjust_ptr_min_max_vals() with
> a stack pointer as a destination we simulate a check_stack_access()
> of 1 byte on the destination and once that fails the program is
> rejected for unpriviledged program loads. This is analoge to map
                                                    ^^^^^^^

Should be "analog".