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Date:   Fri, 24 Nov 2017 10:46:28 +0100
From:   Daniel Borkmann <>
To:     Josef Bacik <>,,,,,,,,
Cc:     Josef Bacik <>
Subject: Re: [PATCH v7 3/5] bpf: add a bpf_override_function helper

On 11/22/2017 10:23 PM, Josef Bacik wrote:
> From: Josef Bacik <>
> 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 <>
> Acked-by: Ingo Molnar <>
> Signed-off-by: Josef Bacik <>

Series looks good to me as well; BPF bits:

Acked-by: Daniel Borkmann <>

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