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Date: Fri, 7 Apr 2023 16:46:06 +0800
From: Feng zhou <zhoufeng.zf@...edance.com>
To: martin.lau@...ux.dev, ast@...nel.org, daniel@...earbox.net,
andrii@...nel.org, song@...nel.org, yhs@...com,
john.fastabend@...il.com, kpsingh@...nel.org, sdf@...gle.com,
haoluo@...gle.com, jolsa@...nel.org, davem@...emloft.net,
edumazet@...gle.com, kuba@...nel.org, pabeni@...hat.com,
mykolal@...com, shuah@...nel.org
Cc: bpf@...r.kernel.org, linux-kernel@...r.kernel.org,
netdev@...r.kernel.org, linux-kselftest@...r.kernel.org,
yangzhenze@...edance.com, wangdongdong.6@...edance.com,
zhouchengming@...edance.com, zhoufeng.zf@...edance.com
Subject: [PATCH v2 0/2] Fix failure to access u32* argument of tracked function
From: Feng Zhou <zhoufeng.zf@...edance.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:
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 | 5 ++---
net/bpf/test_run.c | 8 +++++++-
.../testing/selftests/bpf/verifier/btf_ctx_access.c | 13 +++++++++++++
3 files changed, 22 insertions(+), 4 deletions(-)
--
2.20.1
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