linux-kernel - Re: [PATCH v3 0/2] Fix failure to access u32* argument of tracked function

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Date:   Mon, 10 Apr 2023 20:41:21 +0100
From:   Jiri Olsa <olsajiri@...il.com>
To:     Feng zhou <zhoufeng.zf@...edance.com>
Cc:     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, davem@...emloft.net, edumazet@...gle.com,
        kuba@...nel.org, pabeni@...hat.com, mykolal@...com,
        shuah@...nel.org, 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
Subject: Re: [PATCH v3 0/2] Fix failure to access u32* argument of tracked
 function

On Mon, Apr 10, 2023 at 04:59:06PM +0800, Feng zhou wrote:
> 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:
> 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/

Acked-by: Jiri Olsa <jolsa@...nel.org>

jirka

> 
> 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
>