linux-kernel - RE: [Intel-wired-lan] [PATCH v1 net-next 4/7] i40e: use scnprintf over strncpy+strncat

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Message-ID: <BL0PR11MB3122A776FB2F62D5044B1D60BDD7A@BL0PR11MB3122.namprd11.prod.outlook.com>
Date:   Mon, 16 Oct 2023 08:45:38 +0000
From:   "Pucha, HimasekharX Reddy" <himasekharx.reddy.pucha@...el.com>
To:     Justin Stitt <justinstitt@...gle.com>,
        "Brandeburg, Jesse" <jesse.brandeburg@...el.com>,
        "Nguyen, Anthony L" <anthony.l.nguyen@...el.com>,
        "David S. Miller" <davem@...emloft.net>,
        "Eric Dumazet" <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>
CC:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "intel-wired-lan@...ts.osuosl.org" <intel-wired-lan@...ts.osuosl.org>,
        "linux-hardening@...r.kernel.org" <linux-hardening@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [Intel-wired-lan] [PATCH v1 net-next 4/7] i40e: use scnprintf
 over strncpy+strncat

> -----Original Message-----
> From: Intel-wired-lan <intel-wired-lan-bounces@...osl.org> On Behalf Of Justin Stitt
> Sent: Wednesday, October 11, 2023 3:57 AM
> To: Brandeburg, Jesse <jesse.brandeburg@...el.com>; Nguyen, Anthony L <anthony.l.nguyen@...el.com>; David S. Miller <davem@...emloft.net>; Eric Dumazet <edumazet@...gle.com>; Jakub Kicinski <kuba@...nel.org>; Paolo Abeni <pabeni@...hat.com>
> Cc: netdev@...r.kernel.org; Justin Stitt <justinstitt@...gle.com>; intel-wired-lan@...ts.osuosl.org; linux-hardening@...r.kernel.org; linux-kernel@...r.kernel.org
> Subject: [Intel-wired-lan] [PATCH v1 net-next 4/7] i40e: use scnprintf over strncpy+strncat
>
> `strncpy` is deprecated for use on NUL-terminated destination strings
> [1] and as such we should prefer more robust and less ambiguous string
> interfaces.
>
> Moreover, `strncat` shouldn't really be used either as per
> fortify-string.h:
>  * Do not use this function. While FORTIFY_SOURCE tries to avoid
>  * read and write overflows, this is only possible when the sizes
>  * of @p and @q are known to the compiler. Prefer building the
>  * string with formatting, via scnprintf() or similar.
>
> Instead, use `scnprintf` with "%s%s" format string. This code is now
> more readable and robust.
>
> 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>
>
> ---
> Note: build-tested only.
> ---
>  drivers/net/ethernet/intel/i40e/i40e_ddp.c | 7 +++----
>  1 file changed, 3 insertions(+), 4 deletions(-)
>

Tested-by: Pucha Himasekhar Reddy <himasekharx.reddy.pucha@...el.com> (A Contingent worker at Intel)