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

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Date:   Wed, 24 May 2023 12:15:16 +0000
From:   Sakari Ailus <sakari.ailus@...ux.intel.com>
To:     Azeem Shaikh <azeemshaikh38@...il.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

Hi Azeema,

On Tue, May 23, 2023 at 10:34:34AM -0400, Azeem Shaikh wrote:
> 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

All instances are replaced, so you can drop "all non-returning ".

> 
> 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

Looks good to me.

> 
> > 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.

Oops, my mistake then. :-) I thought I already had changed this. Oh well.

-- 
Regards,

Sakari Ailus