linux-hardening - Re: [PATCH v2] usbip: usbip_host: Replace strlcpy with strscpy

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Date:   Thu, 15 Jun 2023 11:33:34 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Azeem Shaikh <azeemshaikh38@...il.com>
Cc:     Valentina Manea <valentina.manea.m@...il.com>,
        Shuah Khan <shuah@...nel.org>,
        Shuah Khan <skhan@...uxfoundation.org>,
        Kees Cook <keescook@...omium.org>,
        linux-hardening@...r.kernel.org, Hongren Zheng <i@...ithal.me>,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] usbip: usbip_host: Replace strlcpy with strscpy

On Wed, Jun 14, 2023 at 02:10:26PM +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>
> ---
> v1: https://lore.kernel.org/all/20230613004402.3540432-1-azeemshaikh38@gmail.com/
> 
> Changes from v1 - uses "< 0" instead of "== -E2BIG".

Please fix the reported errors from the build bot.

thanks

greg k-h