linux-kernel - Re: [PATCH] staging: rtl*: Remove tasklet callback casts

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Date:   Fri, 15 Nov 2019 08:49:24 -0800
From:   Kees Cook <keescook@...omium.org>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Larry Finger <Larry.Finger@...inger.net>,
        Florian Schilhabel <florian.c.schilhabel@...glemail.com>,
        devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org,
        kernel-hardening@...ts.openwall.com,
        Romain Perier <romain.perier@...il.com>
Subject: Re: [PATCH] staging: rtl*: Remove tasklet callback casts

On Fri, Nov 15, 2019 at 02:16:10PM +0800, Greg Kroah-Hartman wrote:
> On Thu, Nov 14, 2019 at 09:39:00PM -0800, Kees Cook wrote:
> > In order to make the entire kernel usable under Clang's Control Flow
> > Integrity protections, function prototype casts need to be avoided
> > because this will trip CFI checks at runtime (i.e. a mismatch between
> > the caller's expected function prototype and the destination function's
> > prototype). Many of these cases can be found with -Wcast-function-type,
> > which found that the rtl wifi drivers had a bunch of needless function
> > casts. Remove function casts for tasklet callbacks in the various drivers.
> > 
> > Signed-off-by: Kees Cook <keescook@...omium.org>
> > ---
> >  drivers/staging/rtl8188eu/hal/rtl8188eu_recv.c        |  3 +--
> >  drivers/staging/rtl8188eu/hal/rtl8188eu_xmit.c        |  3 +--
> >  drivers/staging/rtl8188eu/include/rtl8188e_recv.h     |  2 +-
> >  drivers/staging/rtl8188eu/include/rtl8188e_xmit.h     |  2 +-
> >  drivers/staging/rtl8188eu/os_dep/usb_ops_linux.c      |  4 ++--
> >  drivers/staging/rtl8192e/rtllib_softmac.c             |  7 +++----
> >  .../staging/rtl8192u/ieee80211/ieee80211_softmac.c    |  7 +++----
> >  drivers/staging/rtl8192u/r8192U_core.c                |  8 ++++----
> >  drivers/staging/rtl8712/rtl8712_recv.c                | 11 +++++------
> >  drivers/staging/rtl8712/rtl871x_xmit.c                |  5 ++---
> >  drivers/staging/rtl8712/rtl871x_xmit.h                |  2 +-
> >  drivers/staging/rtl8712/usb_ops_linux.c               |  4 ++--
> >  drivers/staging/rtl8723bs/hal/rtl8723bs_recv.c        | 11 ++++-------
> >  13 files changed, 30 insertions(+), 39 deletions(-)
> 
> This fails to apply to my staging-next branch of staging.git.  Can you
> rebase and resend?

Ah, hrm, sorry. I think I was based on Linus's master. I will adjust!

-- 
Kees Cook