From: Jakub Kicinski <kuba@kernel.org>
To: Daniel Rosenberg <drosen@google.com>
Cc: bpf@vger.kernel.org, Alexei Starovoitov <ast@kernel.org>,
Daniel Borkmann <daniel@iogearbox.net>,
John Fastabend <john.fastabend@gmail.com>,
Andrii Nakryiko <andrii@kernel.org>,
Martin KaFai Lau <martin.lau@linux.dev>,
Song Liu <song@kernel.org>, Yonghong Song <yhs@fb.com>,
KP Singh <kpsingh@kernel.org>,
Stanislav Fomichev <sdf@google.com>, Hao Luo <haoluo@google.com>,
Jiri Olsa <jolsa@kernel.org>, Shuah Khan <shuah@kernel.org>,
Jonathan Corbet <corbet@lwn.net>,
Joanne Koong <joannelkoong@gmail.com>,
Mykola Lysenko <mykolal@fb.com>,
linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org,
kernel-team@android.com
Subject: Re: [PATCH v2 1/3] bpf: Allow NULL buffers in bpf_dynptr_slice(_rw)
Date: Tue, 18 Jul 2023 08:26:15 -0700 [thread overview]
Message-ID: <20230718082615.08448806@kernel.org> (raw)
In-Reply-To: <20230502005218.3627530-1-drosen@google.com>
On Mon, 1 May 2023 17:52:16 -0700 Daniel Rosenberg wrote:
> --- a/include/linux/skbuff.h
> +++ b/include/linux/skbuff.h
> @@ -4033,7 +4033,7 @@ __skb_header_pointer(const struct sk_buff *skb, int offset, int len,
> if (likely(hlen - offset >= len))
> return (void *)data + offset;
>
> - if (!skb || unlikely(skb_copy_bits(skb, offset, buffer, len) < 0))
> + if (!skb || !buffer || unlikely(skb_copy_bits(skb, offset, buffer, len) < 0))
> return NULL;
First off - please make sure you CC netdev on changes to networking!
Please do not add stupid error checks to core code for BPF safety.
Wrap the call if you can't guarantee that value is sane, this is
a very bad precedent.
next prev parent reply other threads:[~2023-07-18 15:26 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-05-02 0:52 [PATCH v2 1/3] bpf: Allow NULL buffers in bpf_dynptr_slice(_rw) Daniel Rosenberg
2023-05-02 0:52 ` [PATCH v2 2/3] selftests/bpf: Test allowing NULL buffer in dynptr slice Daniel Rosenberg
2023-05-03 16:20 ` Alexei Starovoitov
2023-05-02 0:52 ` [PATCH v2 3/3] selftests/bpf: Check overflow in optional buffer Daniel Rosenberg
2023-05-03 18:49 ` [PATCH v2 1/3] bpf: Allow NULL buffers in bpf_dynptr_slice(_rw) Andrii Nakryiko
2023-07-18 15:26 ` Jakub Kicinski [this message]
2023-07-18 15:52 ` Alexei Starovoitov
2023-07-18 16:06 ` Jakub Kicinski
2023-07-18 16:52 ` Alexei Starovoitov
2023-07-18 17:18 ` Jakub Kicinski
2023-07-18 17:50 ` Alexei Starovoitov
2023-07-18 18:11 ` Jakub Kicinski
2023-07-18 20:34 ` Alexei Starovoitov
2023-07-18 23:06 ` Jakub Kicinski
2023-07-18 23:17 ` Alexei Starovoitov
2023-07-18 23:21 ` Jakub Kicinski
2023-07-18 23:22 ` Alexei Starovoitov
2023-07-19 14:51 ` Daniel Borkmann
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