linux-kernel - Re: [fortify] 54d9469bc5: WARNING:at_net/wireless/wext-core.c:#wireless_send

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Message-ID: <202210102312.1CC8197@keescook>
Date:   Mon, 10 Oct 2022 23:17:58 -0700
From:   Kees Cook <keescook@...omium.org>
To:     kernel test robot <yujie.liu@...el.com>
Cc:     lkp@...ts.01.org, lkp@...el.com, linux-kernel@...r.kernel.org,
        linux-hardening@...r.kernel.org,
        "Gustavo A. R. Silva" <gustavoars@...nel.org>,
        Hawkins Jiawei <yin31149@...il.com>,
        Johannes Berg <johannes.berg@...el.com>,
        linux-wireless@...r.kernel.org
Subject: Re: [fortify] 54d9469bc5:
 WARNING:at_net/wireless/wext-core.c:#wireless_send_event

On Tue, Oct 11, 2022 at 11:46:21AM +0800, kernel test robot wrote:
> commit: 54d9469bc515dc5fcbc20eecbe19cea868b70d68 ("fortify: Add run-time WARN for cross-field memcpy()")
> https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git master
> [...]
> caused below changes (please refer to attached dmesg/kmsg for entire log/backtrace):
> [...]
> [   95.913726][   T36] memcpy: detected field-spanning write (size 16) of single field "&compat_event->pointer" at net/wireless/wext-core.c:623 (size 4)

This was fixed with:
e3e6e1d16a4c ("wifi: wext: use flex array destination for memcpy()")

I expect this will land before -rc1 closes, but Johannes will know more
about the schedule.

-- 
Kees Cook