linux-kernel - Re: [PATCH] kernel: move from strlcpy with unused retval to strscpy

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Message-ID: <YwdAknZFyKxCXZuL@alley>
Date:   Thu, 25 Aug 2022 11:27:46 +0200
From:   Petr Mladek <pmladek@...e.com>
To:     Wolfram Sang <wsa+renesas@...g-engineering.com>
Cc:     linux-kernel@...r.kernel.org, Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>,
        Martin KaFai Lau <martin.lau@...ux.dev>,
        Song Liu <song@...nel.org>, Yonghong Song <yhs@...com>,
        John Fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...nel.org>,
        Stanislav Fomichev <sdf@...gle.com>,
        Hao Luo <haoluo@...gle.com>, Jiri Olsa <jolsa@...nel.org>,
        Tejun Heo <tj@...nel.org>, Zefan Li <lizefan.x@...edance.com>,
        Johannes Weiner <hannes@...xchg.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Sergey Senozhatsky <senozhatsky@...omium.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        John Ogness <john.ogness@...utronix.de>,
        John Stultz <jstultz@...gle.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Stephen Boyd <sboyd@...nel.org>, bpf@...r.kernel.org,
        cgroups@...r.kernel.org, linux-perf-users@...r.kernel.org
Subject: Re: [PATCH] kernel: move from strlcpy with unused retval to strscpy

On Thu 2022-08-18 23:02:01, Wolfram Sang wrote:
> Follow the advice of the below link and prefer 'strscpy' in this
> subsystem. Conversion is 1:1 because the return value is not used.
> Generated by a coccinelle script.
> 
> Link: https://lore.kernel.org/r/CAHk-=wgfRnXz0W3D37d01q3JFkr_i_uTL=V6A6G1oUZcprmknw@mail.gmail.com/
> Signed-off-by: Wolfram Sang <wsa+renesas@...g-engineering.com>
>
> ---
>  kernel/acct.c                         |  2 +-
>  kernel/bpf/preload/bpf_preload_kern.c |  4 ++--
>  kernel/cgroup/cgroup-v1.c             |  4 ++--
>  kernel/events/core.c                  |  6 +++---
>  kernel/kallsyms.c                     |  4 ++--
>  kernel/params.c                       |  2 +-
>  kernel/printk/printk.c                |  2 +-
>  kernel/relay.c                        |  4 ++--
>  kernel/time/clocksource.c             |  2 +-
>  kernel/trace/ftrace.c                 | 18 +++++++++---------
>  kernel/trace/trace.c                  |  8 ++++----
>  kernel/trace/trace_events.c           |  2 +-
>  kernel/trace/trace_events_inject.c    |  4 ++--
>  kernel/trace/trace_kprobe.c           |  2 +-
>  kernel/trace/trace_probe.c            |  2 +-
>  15 files changed, 33 insertions(+), 33 deletions(-)

This fixes only small part of the kernel code. It would make sense to
do a tree-wide change using a script.

Would you mind to create one and send it to Linus?

You might want to use Coccinelle if a simple sed/awk gets too
complicated. See
https://www.kernel.org/doc/html/v4.15/dev-tools/coccinelle.html

Best Regards,
Petr