netdev - [PATCH bpf v2 0/2] Enlarge offset check value in bpf_skb_load

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Date:   Wed, 13 Apr 2022 14:21:29 +0800
From:   Liu Jian <liujian56@...wei.com>
To:     <ast@...nel.org>, <daniel@...earbox.net>, <andrii@...nel.org>,
        <kafai@...com>, <songliubraving@...com>, <yhs@...com>,
        <john.fastabend@...il.com>, <kpsingh@...nel.org>,
        <davem@...emloft.net>, <kuba@...nel.org>, <sdf@...gle.com>,
        <netdev@...r.kernel.org>, <bpf@...r.kernel.org>
CC:     <liujian56@...wei.com>
Subject: [PATCH bpf v2 0/2] Enlarge offset check value in bpf_skb_load_bytes

The data length of skb frags + frag_list may be greater than 0xffff,
and skb_header_pointer can not handle negative offset and negative len.
So here INT_MAX is used to check the validity of offset and len.

And add the test case for the change.

Liu Jian (2):
  net: Enlarge offset check value from 0xffff to INT_MAX in
    bpf_skb_load_bytes
  selftests: bpf: add test for skb_load_bytes

 net/core/filter.c                             |  4 +-
 .../selftests/bpf/prog_tests/skb_load_bytes.c | 45 +++++++++++++++++++
 .../selftests/bpf/progs/skb_load_bytes.c      | 19 ++++++++
 3 files changed, 66 insertions(+), 2 deletions(-)
 create mode 100644 tools/testing/selftests/bpf/prog_tests/skb_load_bytes.c
 create mode 100644 tools/testing/selftests/bpf/progs/skb_load_bytes.c

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2.17.1