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

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Message-ID: <20220818181506.0d838d02@gandalf.local.home>
Date:   Thu, 18 Aug 2022 18:15:06 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
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>,
        Petr Mladek <pmladek@...e.com>,
        Sergey Senozhatsky <senozhatsky@...omium.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, 18 Aug 2022 23:02:01 +0200
Wolfram Sang <wsa+renesas@...g-engineering.com> 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/

Grumble.

"So it's a completely useless function if you can't implicitly trust
the source string - but that is almost always why people think they
should use it!"

But in my cases I actually do trust the source string. They are all
generated from the kernel (not user input). With the exception of the
trace_inject, which I didn't write, and that should definitely be converted.

But eh, I'm not going to argue this one.

-- Steve