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[bpf,0/2] Enlarge offset check value in bpf_skb_load_bytes

Message ID 20220411130255.385520-1-liujian56@huawei.com (mailing list archive)
Headers show
Series Enlarge offset check value in bpf_skb_load_bytes | expand

Message

liujian (CE) April 11, 2022, 1:02 p.m. UTC 
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 | 65 +++++++++++++++++++
 .../selftests/bpf/progs/skb_load_bytes.c      | 37 +++++++++++
 3 files changed, 104 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