linux-hardening - Re: [PATCH] i2c: Replace all non-returning strlcpy with strscpy

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Date:   Tue, 23 May 2023 10:34:34 -0400
From:   Azeem Shaikh <azeemshaikh38@...il.com>
To:     Sakari Ailus <sakari.ailus@...ux.intel.com>
Cc:     Lee Jones <lee@...nel.org>, Sakari Ailus <sakari.ailus@....fi>,
        linux-hardening@...r.kernel.org, linux-leds@...r.kernel.org,
        linux-kernel@...r.kernel.org, Pavel Machek <pavel@....cz>
Subject: Re: [PATCH] i2c: Replace all non-returning strlcpy with strscpy

Thanks for the quick response Lee and Sakari.

On Tue, May 23, 2023 at 5:13 AM Sakari Ailus
<sakari.ailus@...ux.intel.com> wrote:
>
> Hi Lee, Azeem,
>
> On Tue, May 23, 2023 at 10:05:40AM +0100, Lee Jones wrote:
> > On Tue, 23 May 2023, Azeem Shaikh wrote:
> >
> > > strlcpy() reads the entire source buffer first.
> > > This read may exceed the destination size limit.
> > > This is both inefficient and can lead to linear read
> > > overflows if a source string is not NUL-terminated [1].
> > > In an effort to remove strlcpy() completely [2], replace
> > > strlcpy() here with strscpy().
> > > No return values were used, so direct replacement is safe.
> > >
> > > [1] https://www.kernel.org/doc/html/latest/process/deprecated.html#strlcpy
> > > [2] https://github.com/KSPP/linux/issues/89
> > >
> > > Signed-off-by: Azeem Shaikh <azeemshaikh38@...il.com>
> > > ---
> > >  drivers/leds/flash/leds-as3645a.c |    4 ++--
> > >  1 file changed, 2 insertions(+), 2 deletions(-)
> >
> > Please resubmit, taking the time to check the subject line please.
>
> I'd say also shorter description will suffice. Nowadays people understand
> the motivation replacing strlcpy() by strscpy() without too much
> elaboration. Lines may be up to 74 characters long, too, and period isn't
> automatically followed by a newline.
>

Let me know if this commit log looks good to you both and I'll send over a v2.

Subject: [PATCH] leds: as3645a: Replace all non-returning strlcpy with strscpy

Part of a tree-wide effort to remove deprecated strlcpy()[1] and replace
it with strscpy()[2]. No return values were used, so direct replacement
is safe.

[1] https://www.kernel.org/doc/html/latest/process/deprecated.html#strlcpy
[2] https://github.com/KSPP/linux/issues/89

> I also prefer my @linux.intel.com address, as in MAINTAINERS for this
> driver.

Fyi that the email address mentioned for this driver is not the
@linux.intel.com -
https://github.com/torvalds/linux/blob/44c026a73be8038f03dbdeef028b642880cf1511/MAINTAINERS#L3070.
I'm happy to send the v2 patch to sakari.ailus@...ux.intel.com if you
prefer that instead.