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

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Date:   Tue, 1 Jan 2019 23:57:10 +0100
From:   Daniel Borkmann <daniel@...earbox.net>
To:     David Miller <davem@...emloft.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

On 01/01/2019 10:20 PM, David Miller wrote:
> 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".

Thanks for spotting, I'll fix the typos up in v2 shortly.