netdev - [PATCH 0/2] bpf: permit bpf program narrower loads for ctx fields

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Date:   Tue, 13 Jun 2017 15:52:12 -0700
From:   Yonghong Song <yhs@...com>
To:     <ast@...com>, <daniel@...earbox.net>, <netdev@...r.kernel.org>
CC:     <kernel-team@...com>
Subject: [PATCH 0/2] bpf: permit bpf program narrower loads for ctx fields

Today, if users try to access a ctx field through a narrower load, e.g.,
__be16 prot = __sk_buff->protocol, verifier will fail.
This set contains the verifier change to permit such loads for
certain ctx fields as well as the new test cases in selftests/bpf.

Yonghong Song (2):
  bpf: permits narrower load from bpf program context fields
  selftests/bpf: Add test cases to test narrower ctx field loads

 include/linux/bpf.h                              |   2 +-
 include/linux/bpf_verifier.h                     |   1 +
 kernel/bpf/verifier.c                            |  71 +++++---
 kernel/trace/bpf_trace.c                         |  21 ++-
 net/core/filter.c                                |  56 +++++--
 tools/testing/selftests/bpf/Makefile             |   3 +-
 tools/testing/selftests/bpf/test_pkt_md_access.c |  35 ++++
 tools/testing/selftests/bpf/test_progs.c         |  21 +++
 tools/testing/selftests/bpf/test_verifier.c      | 200 ++++++++++++++++++-----
 9 files changed, 324 insertions(+), 86 deletions(-)
 create mode 100644 tools/testing/selftests/bpf/test_pkt_md_access.c

-- 
2.9.3