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Date: Mon, 29 Apr 2024 12:52:49 -0700
From: Kees Cook <keescook@chromium.org>
To: Kalle Valo <kvalo@kernel.org>
Cc: "Gustavo A. R. Silva" <gustavoars@kernel.org>,
	Jeff Johnson <quic_jjohnson@quicinc.com>,
	linux-wireless@vger.kernel.org, linux-kernel@vger.kernel.org,
	linux-hardening@vger.kernel.org
Subject: Re: [PATCH v2][next] wifi: wil6210: wmi: Use __counted_by() in
 struct wmi_set_link_monitor_cmd and avoid -Wfamnae warning
Message-ID: <202404291251.9CBC42E481@keescook>
References: <ZgSTCmdP+omePvWg@neat>
 <171222554691.1806092.8730005090791383928.kvalo@kernel.org>
 <202404291008.51DB333F@keescook>
 <877cggqdwb.fsf@kernel.org>
 <202404291109.331E1704@keescook>
 <87bk5sf003.fsf@kernel.org>
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On Mon, Apr 29, 2024 at 10:21:32PM +0300, Kalle Valo wrote:
> Kees Cook <keescook@chromium.org> writes:
> 
> > On Mon, Apr 29, 2024 at 08:25:56PM +0300, Kalle Valo wrote:
> >
> >> Kees Cook <keescook@chromium.org> writes:
> >> 
> >> > On Thu, Apr 04, 2024 at 10:12:28AM +0000, Kalle Valo wrote:
> >> >
> >> >> "Gustavo A. R. Silva" <gustavoars@kernel.org> wrote:
> >> >> 
> >> >> > Prepare for the coming implementation by GCC and Clang of the
> >> >> > __counted_by attribute. Flexible array members annotated with
> >> >> > __counted_by can have their accesses bounds-checked at run-time
> >> >> > via CONFIG_UBSAN_BOUNDS (for array indexing) and CONFIG_FORTIFY_SOURCE
> >> >> > (for strcpy/memcpy-family functions).
> >> >> > 
> >> >> > Also, -Wflex-array-member-not-at-end is coming in GCC-14, and we are
> >> >> > getting ready to enable it globally.
> >> >> > 
> >> >> > So, use the `DEFINE_FLEX()` helper for an on-stack definition of
> >> >> > a flexible structure where the size of the flexible-array member
> >> >> > is known at compile-time, and refactor the rest of the code,
> >> >> > accordingly.
> >> >> > 
> >> >> > So, with these changes, fix the following warning:
> >> >> > drivers/net/wireless/ath/wil6210/wmi.c:4018:49: warning: structure
> >> >> > containing a flexible array member is not at the end of another
> >> >> > structure [-Wflex-array-member-not-at-end]
> >> >> > 
> >> >> > Link: https://github.com/KSPP/linux/issues/202
> >> >> > Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
> >> >> > Reviewed-by: Jeff Johnson <quic_jjohnson@quicinc.com>
> >> >> > Signed-off-by: Kalle Valo <quic_kvalo@quicinc.com>
> >> >> 
> >> >> Patch applied to ath-next branch of ath.git, thanks.
> >> >> 
> >> >> cbb0697e0ded wifi: wil6210: wmi: Use __counted_by() in struct
> >> >> wmi_set_link_monitor_cmd and avoid -Wfamnae warning
> >> >
> >> > Hi,
> >> >
> >> > I was just walking through our patch tracker and noticed that I don't
> >> > see this patch include in -next yet (as of next-20240429). Is there a
> >> > flush of the ath-next queue planned soon? Or did I miss some change?
> >> 
> >> Yeah, wireless-next was pulled last week so most likely we will create
> >> ath-next pull request this week.
> >> 
> >> BTW we are planning to move ath.git to a new location, rename branches
> >> etc. I think we'll see if we can also setup it so that it can be pulled
> >> to linux-next, so that you don't need to ask this every time ;)
> >> 
> >> (Just joking of course, there a lot of benefits from having the tree in
> >> linux-next)
> >
> > Ah-ha! Thanks. Yeah, sorry if I keep asking about that. It's different
> > from other trees, so it doesn't stick in my head. :) I should keep
> > better notes!
> 
> BTW I think all vendor specific wireless driver trees are not pulled to
> linux-next: iwlwifi, mt76, rtw (Realtek) and ath. So with all of these it will
> take a while before the commit is in linux-next.

How long is "a while"? And if the latency can be reduced for these, it'd
be nice since it would allow for longer bake-time in -next.

-- 
Kees Cook