linux-kernel - Re: [PATCH] ubsan: build ubsan.c more conservatively

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Date:   Mon, 22 Jul 2019 14:52:59 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     Andrey Ryabinin <aryabinin@...tuozzo.com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        "# 3.4.x" <stable@...r.kernel.org>,
        Sodagudi Prasad <psodagud@...eaurora.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Kees Cook <keescook@...omium.org>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        "David S. Miller" <davem@...emloft.net>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        clang-built-linux <clang-built-linux@...glegroups.com>
Subject: Re: [PATCH] ubsan: build ubsan.c more conservatively

On Mon, Jul 22, 2019 at 2:25 PM Andrey Ryabinin <aryabinin@...tuozzo.com> wrote:
> On 7/22/19 12:10 PM, Arnd Bergmann wrote:

> >
> > Fixes: 42440c1f9911 ("lib/ubsan: add type mismatch handler for new GCC/Clang")
>
> There was no uaccess validataion at that time, so the right fixes line is probably this:
>
> Fixes: d08965a27e84 ("x86/uaccess, ubsan: Fix UBSAN vs. SMAP")
>
> > Link: > +CFLAGS_ubsan.o := $(call cc-option, -fno-conserve-stack) $(call cc-option, -fno-stack-protector) $(DISABLE_STACKLEAK_PLUGIN)
>
> $(call cc-option, -fno-conserve-stack) can be removed entirely. It's just copy paste from kasan Makefile.
> It was added in kasan purely for performance reasons.

Ok, I addressed both of these and sent an updated patch, thanks for the review.

       Arnd