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From: Sami Tolvanen <samitolvanen@google.com>
To: Kees Cook <keescook@chromium.org>
Cc: Johannes Berg <johannes@sipsolutions.net>,
	"David S. Miller" <davem@davemloft.net>,
	Jakub Kicinski <kuba@kernel.org>,
	linux-wireless@vger.kernel.org, netdev@vger.kernel.org,
	LKML <linux-kernel@vger.kernel.org>,
	Sedat Dilek <sedat.dilek@gmail.com>
Subject: Re: [PATCH net] cfg80211: fix callback type mismatches in wext-compat
Date: Tue, 17 Nov 2020 14:07:43 -0800	[thread overview]
Message-ID: <CABCJKudJojTh+is8mdMicczgWiTXw+KwCuepmG5gLVmqPWjnHA@mail.gmail.com> (raw)
In-Reply-To: <202011171338.BB25DBD1E6@keescook>

On Tue, Nov 17, 2020 at 1:45 PM Kees Cook <keescook@chromium.org> wrote:
>
> On Tue, Nov 17, 2020 at 12:59:02PM -0800, Sami Tolvanen wrote:
> > Instead of casting callback functions to type iw_handler, which trips
> > indirect call checking with Clang's Control-Flow Integrity (CFI), add
> > stub functions with the correct function type for the callbacks.
>
> Oh, wow. iw_handler with union iwreq_data look like really nasty hacks.
> Aren't those just totally bypassing type checking? Where do the
> callbacks actually happen? I couldn't find them...

The callbacks to these happen in ioctl_standard_call in wext-core.c.

Sami

  reply	other threads:[~2020-11-17 22:08 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-11-17 20:59 [PATCH net] cfg80211: fix callback type mismatches in wext-compat Sami Tolvanen
2020-11-17 21:44 ` Kees Cook
2020-11-17 22:07   ` Sami Tolvanen [this message]
2020-11-20 19:26     ` Kees Cook
2020-11-20 21:33       ` Johannes Berg
2020-11-20 19:18 ` Kees Cook

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