linux-hardening - Re: [PATCH] ionic: replace deprecated strncpy with strscpy

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Date: Wed, 11 Oct 2023 15:25:29 -0700
From: Justin Stitt <justinstitt@...gle.com>
To: "Nelson, Shannon" <shannon.nelson@....com>
Cc: Brett Creeley <brett.creeley@....com>, drivers@...sando.io, 
	"David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, 
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, netdev@...r.kernel.org, 
	linux-kernel@...r.kernel.org, linux-hardening@...r.kernel.org
Subject: Re: [PATCH] ionic: replace deprecated strncpy with strscpy

On Wed, Oct 11, 2023 at 3:17 PM Nelson, Shannon <shannon.nelson@....com> wrote:
>
> On 10/11/2023 2:53 PM, 'Justin Stitt' via Pensando Drivers wrote:
> >
> > strncpy() is deprecated for use on NUL-terminated destination strings
> > [1] and as such we should prefer more robust and less ambiguous string
> > interfaces.
> >
> > NUL-padding is not needed due to `ident` being memset'd to 0 just before
> > the copy.
> >
> > Considering the above, a suitable replacement is `strscpy` [2] due to
> > the fact that it guarantees NUL-termination on the destination buffer
> > without unnecessarily NUL-padding.
> >
> > Link: https://www.kernel.org/doc/html/latest/process/deprecated.html#strncpy-on-nul-terminated-strings [1]
> > Link: https://manpages.debian.org/testing/linux-manual-4.8/strscpy.9.en.html [2]
> > Link: https://github.com/KSPP/linux/issues/90
> > Cc: linux-hardening@...r.kernel.org
> > Signed-off-by: Justin Stitt <justinstitt@...gle.com>
>
> Thanks, I suspected this was coming soon :-)
>
> Reviewed-by: Shannon Nelson <shannon.nelson@....com>

Thanks Shannon!

>
>
> > ---
> > Note: build-tested only.
> >
> > Found with: $ rg "strncpy\("
> > ---
> >   drivers/net/ethernet/pensando/ionic/ionic_main.c | 4 ++--
> >   1 file changed, 2 insertions(+), 2 deletions(-)
> >
> > diff --git a/drivers/net/ethernet/pensando/ionic/ionic_main.c b/drivers/net/ethernet/pensando/ionic/ionic_main.c
> > index 1dc79cecc5cc..835577392178 100644
> > --- a/drivers/net/ethernet/pensando/ionic/ionic_main.c
> > +++ b/drivers/net/ethernet/pensando/ionic/ionic_main.c
> > @@ -554,8 +554,8 @@ int ionic_identify(struct ionic *ionic)
> >          memset(ident, 0, sizeof(*ident));
> >
> >          ident->drv.os_type = cpu_to_le32(IONIC_OS_TYPE_LINUX);
> > -       strncpy(ident->drv.driver_ver_str, UTS_RELEASE,
> > -               sizeof(ident->drv.driver_ver_str) - 1);
> > +       strscpy(ident->drv.driver_ver_str, UTS_RELEASE,
> > +               sizeof(ident->drv.driver_ver_str));
> >
> >          mutex_lock(&ionic->dev_cmd_lock);
> >
> >
> > ---
> > base-commit: cbf3a2cb156a2c911d8f38d8247814b4c07f49a2
> > change-id: 20231011-strncpy-drivers-net-ethernet-pensando-ionic-ionic_main-c-709f8f1ea312
> >
> > Best regards,
> > --
> > Justin Stitt <justinstitt@...gle.com>
> >