linux-hardening - Re: [PATCH v3] usbip: usbip_host: Replace strlcpy with strscpy

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Date:   Thu, 22 Jun 2023 09:30:33 -0600
From:   Shuah Khan <skhan@...uxfoundation.org>
To:     Kees Cook <keescook@...omium.org>,
        Azeem Shaikh <azeemshaikh38@...il.com>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Valentina Manea <valentina.manea.m@...il.com>,
        Shuah Khan <shuah@...nel.org>, linux-hardening@...r.kernel.org,
        Hongren Zheng <i@...ithal.me>, linux-usb@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Shuah Khan <skhan@...uxfoundation.org>
Subject: Re: [PATCH v3] usbip: usbip_host: Replace strlcpy with strscpy

On 6/21/23 21:10, Kees Cook wrote:
> On Thu, Jun 15, 2023 at 06:05:04PM +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 return value of -errno
>> is used to check for truncation instead of sizeof(dest).
>>
>> [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>
> 
> Reviewed-by: Kees Cook <keescook@...omium.org>
> 

Acked-by: Shuah Khan <skhan@...uxfoundation.org>

thanks,
-- Shuah