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From: Christoph Hellwig <hch@lst.de>
To: Andrii Nakryiko <andriin@fb.com>
Cc: bpf@vger.kernel.org, netdev@vger.kernel.org, ast@fb.com,
	daniel@iogearbox.net, andrii.nakryiko@gmail.com,
	kernel-team@fb.com, Christoph Hellwig <hch@lst.de>
Subject: Re: [PATCH bpf 1/2] bpf: bpf_probe_read_kernel_str() has to return amount of data read on success
Date: Tue, 16 Jun 2020 08:54:49 +0200	[thread overview]
Message-ID: <20200616065449.GA17288@lst.de> (raw)
In-Reply-To: <20200616050432.1902042-1-andriin@fb.com>

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@lst.de>
> Fixes: 8d92db5c04d1 ("bpf: rework the compat kernel probe handling")
> Signed-off-by: Andrii Nakryiko <andriin@fb.com>

Looks good, thanks for fixing this up:

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

  parent reply	other threads:[~2020-06-16  6:54 UTC|newest]

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-06-16  5:04 [PATCH bpf 1/2] bpf: bpf_probe_read_kernel_str() has to return amount of data read on success Andrii Nakryiko
2020-06-16  5:04 ` [PATCH bpf 2/2] selftests/bpf: add variable-length data concatenation pattern test Andrii Nakryiko
2020-06-16 20:21   ` Daniel Borkmann
2020-06-16 21:27     ` Andrii Nakryiko
2020-06-16 22:23       ` Daniel Borkmann
2020-06-16 23:14         ` Andrii Nakryiko
2020-06-17 15:51           ` Daniel Borkmann
2020-06-18 19:09   ` John Fastabend
2020-06-18 21:59     ` Andrii Nakryiko
2020-06-18 23:48       ` John Fastabend
2020-06-19  0:09         ` Andrii Nakryiko
2020-06-16  6:54 ` Christoph Hellwig [this message]
2020-06-16  7:01 ` [PATCH bpf 1/2] bpf: bpf_probe_read_kernel_str() has to return amount of data read on success John Fastabend

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