netdev - Re: [PATCH v6 7/9] tracing: Replace strncpy() with strscpy()

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Message-ID: <CAFhGd8oBmBVooQha7EB+_wenO8TfOjqJsZAzgHLuDUSYmwxy=w@mail.gmail.com>
Date: Tue, 13 Aug 2024 15:31:26 -0700
From: Justin Stitt <justinstitt@...gle.com>
To: Yafang Shao <laoar.shao@...il.com>
Cc: akpm@...ux-foundation.org, torvalds@...ux-foundation.org, 
	ebiederm@...ssion.com, alexei.starovoitov@...il.com, rostedt@...dmis.org, 
	catalin.marinas@....com, penguin-kernel@...ove.sakura.ne.jp, 
	linux-mm@...ck.org, linux-fsdevel@...r.kernel.org, 
	linux-trace-kernel@...r.kernel.org, audit@...r.kernel.org, 
	linux-security-module@...r.kernel.org, selinux@...r.kernel.org, 
	bpf@...r.kernel.org, netdev@...r.kernel.org, dri-devel@...ts.freedesktop.org, 
	Masami Hiramatsu <mhiramat@...nel.org>, Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
Subject: Re: [PATCH v6 7/9] tracing: Replace strncpy() with strscpy()

On Tue, Aug 13, 2024 at 3:19 PM Justin Stitt <justinstitt@...gle.com> wrote:
>
> Hi,
>
> On Mon, Aug 12, 2024 at 10:29:31AM GMT, Yafang Shao wrote:
> > Using strscpy() to read the task comm ensures that the name is
> > always NUL-terminated, regardless of the source string. This approach also
> > facilitates future extensions to the task comm.
>
> Thanks for sending patches replacing str{n}cpy's!
>
> I believe there's at least two more instances of strncpy in trace.c as
> well as in trace_events_hist.c (for a grand total of 6 instances in the
> files you've touched in this specific patch).
>
> It'd be great if you could replace those instances in this patch as well :>)
>
> This would help greatly with [1].
>

I just saw that Jinjie Ruan sent replacements for these strncpy's too
and tracked down and replaced an instance of strscpy() that was
present in trace.c but was moved to trace_sched_switch.c during a
refactor.

They even used the new 2-argument strscpy which is pretty neat.

See their patch here:
https://lore.kernel.org/all/20240731075058.617588-1-ruanjinjie@huawei.com/

> Link: https://github.com/KSPP/linux/issues/90 [1]
> Link: https://lore.kernel.org/all/CAHk-=whWtUC-AjmGJveAETKOMeMFSTwKwu99v7+b6AyHMmaDFA@mail.gmail.com/ [2]
>
> Thanks
> Justin