From: Kees Cook <keescook@chromium.org>
To: Azeem Shaikh <azeemshaikh38@gmail.com>
Cc: Jakub Kicinski <kuba@kernel.org>,
linux-hardening@vger.kernel.org, linux-wireless@vger.kernel.org,
linux-kernel@vger.kernel.org, Kalle Valo <kvalo@kernel.org>,
Matthias Brugger <matthias.bgg@gmail.com>,
AngeloGioacchino Del Regno
<angelogioacchino.delregno@collabora.com>,
linux-arm-kernel@lists.infradead.org,
linux-mediatek@lists.infradead.org
Subject: Re: [PATCH] net/mediatek: strlcpy withreturn
Date: Tue, 13 Jun 2023 12:23:59 -0700 [thread overview]
Message-ID: <202306131223.F8F403D386@keescook> (raw)
In-Reply-To: <20230613003458.3538812-1-azeemshaikh38@gmail.com>
On Tue, Jun 13, 2023 at 12:34:57AM +0000, 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 DEV_ASSIGN is only used by
> TRACE macros and the return values are ignored.
>
> [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@gmail.com>
Yup double-checked the users of the macros. Looks good to me.
Reviewed-by: Kees Cook <keescook@chromium.org>
--
Kees Cook
next prev parent reply other threads:[~2023-06-13 19:24 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-06-13 0:34 [PATCH] net/mediatek: strlcpy withreturn Azeem Shaikh
2023-06-13 8:35 ` Kalle Valo
2023-06-13 14:11 ` Azeem Shaikh
2023-06-13 19:23 ` Kees Cook [this message]
2023-06-15 7:46 ` wifi: mt7601u: replace strlcpy() with strscpy() Kalle Valo
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