linux-kernel - Re: [PATCH 1/2] bpf: add a bpf_override

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Message-ID: <5A026BD2.6000007@iogearbox.net>
Date:   Wed, 08 Nov 2017 03:28:34 +0100
From:   Daniel Borkmann <daniel@...earbox.net>
To:     Josef Bacik <josef@...icpanda.com>, rostedt@...dmis.org,
        mingo@...hat.com, davem@...emloft.net, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, ast@...nel.org, kernel-team@...com
CC:     Josef Bacik <jbacik@...com>
Subject: Re: [PATCH 1/2] bpf: add a bpf_override_function helper

On 11/07/2017 09:28 PM, Josef Bacik wrote:
> From: Josef Bacik <jbacik@...com>
>
> Error injection is sloppy and very ad-hoc.  BPF could fill this niche
> perfectly with it's kprobe functionality.  We could make sure errors are
> only triggered in specific call chains that we care about with very
> specific situations.  Accomplish this with the bpf_override_funciton
> helper.  This will modify the probe'd callers return value to the
> specified value and set the PC to an override function that simply
> returns, bypassing the originally probed function.  This gives us a nice
> clean way to implement systematic error injection for all of our code
> paths.
>
> Acked-by: Alexei Starovoitov <ast@...nel.org>
> Signed-off-by: Josef Bacik <jbacik@...com>

BPF bits:

Acked-by: Daniel Borkmann <daniel@...earbox.net>