linux-hardening - Re: [PATCH] ath10k: replace deprecated strncpy with strtomem

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Message-ID: <57a56da6-a86f-4bc3-beb6-8ef6dbbbb3bd@quicinc.com>
Date: Tue, 24 Oct 2023 16:25:35 -0700
From: Jeff Johnson <quic_jjohnson@...cinc.com>
To: Kees Cook <keescook@...omium.org>
CC: Kalle Valo <kvalo@...nel.org>, Justin Stitt <justinstitt@...gle.com>,
        <ath10k@...ts.infradead.org>, <linux-wireless@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <linux-hardening@...r.kernel.org>
Subject: Re: [PATCH] ath10k: replace deprecated strncpy with strtomem_pad

On 10/24/2023 2:43 PM, Kees Cook wrote:
> On Tue, Oct 24, 2023 at 07:11:51AM -0700, Jeff Johnson wrote:
>> On 10/24/2023 6:03 AM, Kalle Valo wrote:
>>> What about using just memcpy() to make it clear it's not really a proper
>>> string:
>>>
>>> arvif->u.ap.ssid_len = 4;
>>> memcpy(arvif->u.ap.ssid, "mesh", arvif->u.ap.ssid_len);
>>>
>>
>> In the "changed & BSS_CHANGED_SSID" case that comes soon after this we just
>> set the length and use memcpy without clearing the rest of the buffer, so
>> doing the same here, as you suggest, would be consistent.
> 
> Ah, please ignore my other email asking about memcpy safety -- I'm
> reading threads backwards.  :)
> 
And I'm replying without first reading through my mail queue