linux-kernel - Re: [PATCH] crypto: hisilicon - fix strncpy warning with strlcpy

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Message-ID: <f8dceec5-6835-c064-bb43-fd12668c2dbb@linaro.org>
Date:   Fri, 5 Jun 2020 17:34:32 +0800
From:   Zhangfei Gao <zhangfei.gao@...aro.org>
To:     Herbert Xu <herbert@...dor.apana.org.au>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jonathan Cameron <Jonathan.Cameron@...wei.com>,
        wangzhou1 <wangzhou1@...ilicon.com>,
        linux-kernel@...r.kernel.org, linux-crypto@...r.kernel.org,
        kbuild-all@...ts.01.org
Subject: Re: [PATCH] crypto: hisilicon - fix strncpy warning with strlcpy



On 2020/6/4 下午2:50, Herbert Xu wrote:
> On Thu, Jun 04, 2020 at 02:44:16PM +0800, Zhangfei Gao wrote:
>> I think it is fine.
>> 1. Currently the name size is 64, bigger enough.
>> Simply grep in driver name, 64 should be enough.
>> We can make it larger when there is a request.
>> 2. it does not matter what the name is, since it is just an interface.
>> cat /sys/class/uacce/hisi_zip-0/flags
>> cat /sys/class/uacce/his-0/flags
>> should be both fine to app only they can be distinguished.
>> 3. It maybe a hard restriction to fail just because of a long name.
> I think we should err on the side of caution.  IOW, unless you
> know that you need it to succeed when it exceeds the limit, then
> you should just make it fail.
Thanks Herbert
Will add a check after the copy.

         strlcpy(interface.name, pdev->driver->name, 
sizeof(interface.name));
         if (strlen(pdev->driver->name) != strlen(interface.name))
                 return -EINVAL;

Will resend the fix after rc1 is open.

Thanks