linux-kernel - Re: [PATCH v4 1/3] kasan: No KASAN's memmove check if archs don't have it.

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Date:   Mon, 18 Nov 2019 09:41:06 +0100
From:   Dmitry Vyukov <dvyukov@...gle.com>
To:     Paul Walmsley <paul.walmsley@...ive.com>
Cc:     Alexander Potapenko <glider@...gle.com>,
        Andrey Ryabinin <aryabinin@...tuozzo.com>,
        Nick Hu <nickhu@...estech.com>,
        Jonathan Corbet <corbet@....net>, palmer@...ive.com,
        aou@...s.berkeley.edu, Thomas Gleixner <tglx@...utronix.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        alankao@...estech.com, Anup.Patel@....com, atish.patra@....com,
        kasan-dev <kasan-dev@...glegroups.com>,
        "open list:DOCUMENTATION" <linux-doc@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        linux-riscv@...ts.infradead.org, Linux-MM <linux-mm@...ck.org>,
        green.hu@...il.com
Subject: Re: [PATCH v4 1/3] kasan: No KASAN's memmove check if archs don't
 have it.

On Sun, Nov 17, 2019 at 5:58 AM Paul Walmsley <paul.walmsley@...ive.com> wrote:
>
> Hello Andrey, Alexander, Dmitry,
>
> On Mon, 28 Oct 2019, Nick Hu wrote:
>
> > If archs don't have memmove then the C implementation from lib/string.c is used,
> > and then it's instrumented by compiler. So there is no need to add KASAN's
> > memmove to manual checks.
> >
> > Signed-off-by: Nick Hu <nickhu@...estech.com>
>
> If you're happy with this revision of this patch, could you please ack it
> so we can merge it as part of the RISC-V KASAN patch set?
>
> Or if you'd prefer to take this patch yourself, please let me know.

Hi Paul,

Acked-by: Dmitry Vyukov <dvyukov@...gle.com>

We don't have separate tree for kasan. Merging this via RISC-V tree
should be fine.

Thanks

> -
>
> > ---
> >  mm/kasan/common.c | 2 ++
> >  1 file changed, 2 insertions(+)
> >
> > diff --git a/mm/kasan/common.c b/mm/kasan/common.c
> > index 6814d6d6a023..897f9520bab3 100644
> > --- a/mm/kasan/common.c
> > +++ b/mm/kasan/common.c
> > @@ -107,6 +107,7 @@ void *memset(void *addr, int c, size_t len)
> >       return __memset(addr, c, len);
> >  }
> >
> > +#ifdef __HAVE_ARCH_MEMMOVE
> >  #undef memmove
> >  void *memmove(void *dest, const void *src, size_t len)
> >  {
> > @@ -115,6 +116,7 @@ void *memmove(void *dest, const void *src, size_t len)
> >
> >       return __memmove(dest, src, len);
> >  }
> > +#endif
> >
> >  #undef memcpy
> >  void *memcpy(void *dest, const void *src, size_t len)
> > --
> > 2.17.0
> >
> >
> > _______________________________________________
> > linux-riscv mailing list
> > linux-riscv@...ts.infradead.org
> > http://lists.infradead.org/mailman/listinfo/linux-riscv
> >
>
>
> - Paul

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