linux-kernel - Re: [PATCH v2] drivers/bluetooth: Remove all strcpy() uses

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Message-Id: <B9CF4857-98A5-418D-B689-A13A230A6641@holtmann.org>
Date:   Thu, 29 Jul 2021 13:47:25 +0200
From:   Marcel Holtmann <marcel@...tmann.org>
To:     Len Baker <len.baker@....com>
Cc:     Kees Cook <keescook@...omium.org>,
        Johan Hedberg <johan.hedberg@...il.com>,
        Luiz Augusto von Dentz <luiz.dentz@...il.com>,
        Adam Sampson <ats@...og.org>, linux-bluetooth@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-hardening@...r.kernel.org
Subject: Re: [PATCH v2] drivers/bluetooth: Remove all strcpy() uses

Hi Len,

> strcpy() performs no bounds checking on the destination buffer. This
> could result in linear overflows beyond the end of the buffer, leading
> to all kinds of misbehaviors. The safe replacement is strscpy() but in
> this case it is better to use the scnprintf to simplify the arithmetic.
> 
> This is a previous step in the path to remove the strcpy() function
> entirely from the kernel.
> 
> Signed-off-by: Len Baker <len.baker@....com>
> ---
> Changelog v1 -> v2
> - Add spaces to the "plus" sign.
> - Use the correct size for the fw_dump_ptr buffer (Adam Sampson)
> 
> drivers/bluetooth/btmrvl_sdio.c | 29 ++++++++++++++---------------
> 1 file changed, 14 insertions(+), 15 deletions(-)

patch has been applied to bluetooth-next tree.

Regards

Marcel