netdev - [PATCH bpf-next v4 0/3] Enlarge offset check value in bpf_skb_load

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Date:   Sat, 16 Apr 2022 18:57:58 +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>,
        <pabeni@...hat.com>
CC:     <liujian56@...wei.com>
Subject: [PATCH bpf-next v4 0/3] 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.
So here INT_MAX is used to check the validity of offset.

And add the test case for the change.

Liu Jian (3):
  net: Enlarge offset check value from 0xffff to INT_MAX in
    bpf_skb_load_bytes
  net: change skb_ensure_writable()'s write_len param to unsigned int
    type
  selftests: bpf: add test for skb_load_bytes

 include/linux/skbuff.h                        |  2 +-
 net/core/filter.c                             |  4 +-
 net/core/skbuff.c                             |  2 +-
 .../selftests/bpf/prog_tests/skb_load_bytes.c | 45 +++++++++++++++++++
 .../selftests/bpf/progs/skb_load_bytes.c      | 19 ++++++++
 5 files changed, 68 insertions(+), 4 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

-- 
2.17.1