linux-kernel - Re: [PATCH v7 0/2] bpftool: Refactor config parsing and add CET symbol matching

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Message-ID: <aKznVD6BjdBCvm0e@krava>
Date: Tue, 26 Aug 2025 00:44:36 +0200
From: Jiri Olsa <olsajiri@...il.com>
To: chenyuan_fl@....com
Cc: olsajiri@...il.com, aef2617b-ce03-4830-96a7-39df0c93aaad@...nel.org,
	andrii@...nel.org, ast@...nel.org, bpf@...r.kernel.org,
	chenyuan@...inos.cn, daniel@...earbox.net,
	linux-kernel@...r.kernel.org, qmo@...nel.org,
	yonghong.song@...ux.dev
Subject: Re: [PATCH v7 0/2] bpftool: Refactor config parsing and add CET
 symbol matching

On Mon, Aug 25, 2025 at 03:20:00AM +0100, chenyuan_fl@....com wrote:
> From: Yuan CHen <chenyuan@...inos.cn>
> 
> 1. **Refactor kernel config parsing**  
>    - Moves duplicate config file handling from feature.c to common.c  
>    - Keeps all existing functionality while enabling code reuse  
> 
> 2. **Add CET-aware symbol matching**  
>    - Adjusts kprobe hook detection for x86_64 CET (endbr32/64 prefixes)  
>    - Matches symbols at both original and CET-adjusted addresses  
> 
> Changed in PATCH v4:
> * Refactor repeated code into a function.
> * Add detection for the x86 architecture.
> 
> Changed int PATH v5:
> * Remove detection for the x86 architecture.
> 
>  Changed in PATCH v6:
> * Add new helper patch (1/2) to refactor kernel config reading
> * Use the new read_kernel_config() in CET symbol matching (2/2) to check CONFIG_X86_KERNEL_IBT
> 
> Changed in PATCH v7:
> * Display actual kprobe attachment addresses instead of symbol addresses

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

thanks,
jirka


> 
> Yuan Chen (2):
>   bpftool: Refactor kernel config reading into common helper
>   bpftool: Add CET-aware symbol matching for x86_64 architectures
> 
>  tools/bpf/bpftool/common.c  | 93 +++++++++++++++++++++++++++++++++++++
>  tools/bpf/bpftool/feature.c | 86 ++--------------------------------
>  tools/bpf/bpftool/link.c    | 38 ++++++++++++++-
>  tools/bpf/bpftool/main.h    |  9 ++++
>  4 files changed, 142 insertions(+), 84 deletions(-)
> 
> -- 
> 2.39.5
>