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From:   Feng zhou <zhoufeng.zf@bytedance.com>
To:     martin.lau@linux.dev, ast@kernel.org, daniel@iogearbox.net,
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Cc:     bpf@vger.kernel.org, linux-kernel@vger.kernel.org,
        netdev@vger.kernel.org, linux-kselftest@vger.kernel.org,
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        zhouchengming@bytedance.com, zhoufeng.zf@bytedance.com
Subject: [PATCH v3 0/2] Fix failure to access u32* argument of tracked function
Date:   Mon, 10 Apr 2023 16:59:06 +0800
Message-Id: <20230410085908.98493-1-zhoufeng.zf@bytedance.com>
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From: Feng Zhou <zhoufeng.zf@bytedance.com>

When access traced function arguments with type is u32*, bpf verifier failed.
Because u32 have typedef, needs to skip modifier. Add btf_type_is_modifier in
is_int_ptr. Add a selftest to check it.

Feng Zhou (2):
  bpf/btf: Fix is_int_ptr()
  selftests/bpf: Add test to access u32 ptr argument in tracing program

Changelog:
v2->v3: Addressed comments from jirka
- Fix an issue that caused other test items to fail
Details in here:
https://lore.kernel.org/all/20230407084608.62296-1-zhoufeng.zf@bytedance.com/

v1->v2: Addressed comments from Martin KaFai Lau
- Add a selftest.
- use btf_type_skip_modifiers.
Some details in here:
https://lore.kernel.org/all/20221012125815.76120-1-zhouchengming@bytedance.com/

 kernel/bpf/btf.c                                    |  8 ++------
 net/bpf/test_run.c                                  |  8 +++++++-
 .../testing/selftests/bpf/verifier/btf_ctx_access.c | 13 +++++++++++++
 3 files changed, 22 insertions(+), 7 deletions(-)

-- 
2.20.1