netdev - Re: [PATCH bpf 1/2] bpf: bpf_probe_read_kernel_str() has to return amount of data read on success

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Date:   Tue, 16 Jun 2020 08:54:49 +0200
From:   Christoph Hellwig <hch@....de>
To:     Andrii Nakryiko <andriin@...com>
Cc:     bpf@...r.kernel.org, netdev@...r.kernel.org, ast@...com,
        daniel@...earbox.net, andrii.nakryiko@...il.com,
        kernel-team@...com, Christoph Hellwig <hch@....de>
Subject: Re: [PATCH bpf 1/2] bpf: bpf_probe_read_kernel_str() has to return
 amount of data read on success

On Mon, Jun 15, 2020 at 10:04:30PM -0700, Andrii Nakryiko wrote:
> During recent refactorings, bpf_probe_read_kernel_str() started returning 0 on
> success, instead of amount of data successfully read. This majorly breaks
> applications relying on bpf_probe_read_kernel_str() and bpf_probe_read_str()
> and their results. Fix this by returning actual number of bytes read.
> 
> Cc: Christoph Hellwig <hch@....de>
> Fixes: 8d92db5c04d1 ("bpf: rework the compat kernel probe handling")
> Signed-off-by: Andrii Nakryiko <andriin@...com>

Looks good, thanks for fixing this up:

Reviewed-by: Christoph Hellwig <hch@....de>