linux-kernel - Re: [PATCH 2/3] kasan: move kasan

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Message-ID: <20200528151554.GC2702@lca.pw>
Date:   Thu, 28 May 2020 11:15:54 -0400
From:   Qian Cai <cai@....pw>
To:     Andrey Konovalov <andreyknvl@...gle.com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Andrey Ryabinin <aryabinin@...tuozzo.com>,
        Alexander Potapenko <glider@...gle.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        kasan-dev <kasan-dev@...glegroups.com>,
        Linux Memory Management List <linux-mm@...ck.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Leon Romanovsky <leonro@...lanox.com>,
        Leon Romanovsky <leon@...nel.org>,
        Randy Dunlap <rdunlap@...radead.org>,
        Josh Poimboeuf <jpoimboe@...hat.com>
Subject: Re: [PATCH 2/3] kasan: move kasan_report() into report.c

On Thu, May 28, 2020 at 05:00:54PM +0200, 'Andrey Konovalov' via kasan-dev wrote:
> On Thu, May 28, 2020 at 3:49 PM Qian Cai <cai@....pw> wrote:
> >
> > On Tue, May 12, 2020 at 05:33:20PM +0200, 'Andrey Konovalov' via kasan-dev wrote:
> > > The kasan_report() functions belongs to report.c, as it's a common
> > > functions that does error reporting.
> > >
> > > Reported-by: Leon Romanovsky <leon@...nel.org>
> > > Signed-off-by: Andrey Konovalov <andreyknvl@...gle.com>
> >
> > Today's linux-next produced this with Clang 11.
> >
> > mm/kasan/report.o: warning: objtool: kasan_report()+0x8a: call to __stack_chk_fail() with UACCESS enabled
> >
> > kasan_report at mm/kasan/report.c:536
> 
> Hm, the first patch in the series ("kasan: consistently disable
> debugging features") disables stack protector for kasan files. Is that
> patch in linux-next?

Yes, it is there,

+CFLAGS_report.o := $(call cc-option, -fno-conserve-stack -fno-stack-protector)

It seems that will not work for Clang?