Re: [PATCH 2/3] kasan: move kasan_report() into report.c

[Andrey Konovalov]

On Thu, May 28, 2020 at 5:15 PM Qian Cai <cai@xxxxxx> wrote:
>
> 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@xxxxxx> 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@xxxxxxxxxx>
> > > > Signed-off-by: Andrey Konovalov <andreyknvl@xxxxxxxxxx>
> > >
> > > 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?

Ah, Clang doesn't have -fno-conserve-stack and that makes the whole
cc-option expression fail? OK, I'll send a fix.