Date: Fri, 15 Nov 2019 10:40:03 +0300 From: Dan Carpenter <dan.carpenter@...cle.com> To: Kees Cook <keescook@...omium.org> Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, devel@...verdev.osuosl.org, Florian Schilhabel <florian.c.schilhabel@...glemail.com>, kernel-hardening@...ts.openwall.com, linux-kernel@...r.kernel.org, Romain Perier <romain.perier@...il.com>, Larry Finger <Larry.Finger@...inger.net> Subject: Re: [PATCH] staging: rtl*: Remove tasklet callback casts 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> Clang should treat void pointers as a special case. If void pointers are bad, surely replacing them with unsigned long is even more ambigous and worse. regards, dan carpenter
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