linux-hardening - Re: [PATCH] ieee802154: Replace strlcpy with strscpy

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Date:   Fri, 16 Jun 2023 23:32:48 +0200
From:   Stefan Schmidt <stefan@...enfreihafen.org>
To:     Azeem Shaikh <azeemshaikh38@...il.com>,
        Alexander Aring <alex.aring@...il.com>,
        Miquel Raynal <miquel.raynal@...tlin.com>
Cc:     linux-hardening@...r.kernel.org, linux-wpan@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        "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
Subject: Re: [PATCH] ieee802154: Replace strlcpy with strscpy

Hello.

On 13.06.23 02:33, 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().
> 
> Direct replacement is safe here since the return values
> from the helper macros are ignored by the callers.
> 
> [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>
> ---
>   net/ieee802154/trace.h |    2 +-
>   net/mac802154/trace.h  |    2 +-
>   2 files changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/net/ieee802154/trace.h b/net/ieee802154/trace.h
> index e5d8439b9e45..c16db0b326fa 100644
> --- a/net/ieee802154/trace.h
> +++ b/net/ieee802154/trace.h
> @@ -13,7 +13,7 @@
>   
>   #define MAXNAME		32
>   #define WPAN_PHY_ENTRY	__array(char, wpan_phy_name, MAXNAME)
> -#define WPAN_PHY_ASSIGN	strlcpy(__entry->wpan_phy_name,	 \
> +#define WPAN_PHY_ASSIGN	strscpy(__entry->wpan_phy_name,	 \
>   				wpan_phy_name(wpan_phy), \
>   				MAXNAME)
>   #define WPAN_PHY_PR_FMT	"%s"
> diff --git a/net/mac802154/trace.h b/net/mac802154/trace.h
> index 689396d6c76a..1574ecc48075 100644
> --- a/net/mac802154/trace.h
> +++ b/net/mac802154/trace.h
> @@ -14,7 +14,7 @@
>   
>   #define MAXNAME		32
>   #define LOCAL_ENTRY	__array(char, wpan_phy_name, MAXNAME)
> -#define LOCAL_ASSIGN	strlcpy(__entry->wpan_phy_name, \
> +#define LOCAL_ASSIGN	strscpy(__entry->wpan_phy_name, \
>   				wpan_phy_name(local->hw.phy), MAXNAME)
>   #define LOCAL_PR_FMT	"%s"
>   #define LOCAL_PR_ARG	__entry->wpan_phy_name


This patch has been applied to the wpan tree and will be
part of the next pull request to net. Thanks!

regards
Stefan Schmidt