linux-kernel - Re: [PATCH v2 07/37] kasan: split out shadow.c from common.c

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Date:   Fri, 18 Sep 2020 10:17:42 +0200
From:   Alexander Potapenko <glider@...gle.com>
To:     Andrey Konovalov <andreyknvl@...gle.com>
Cc:     Dmitry Vyukov <dvyukov@...gle.com>,
        Vincenzo Frascino <vincenzo.frascino@....com>,
        Catalin Marinas <catalin.marinas@....com>,
        kasan-dev <kasan-dev@...glegroups.com>,
        Andrey Ryabinin <aryabinin@...tuozzo.com>,
        Marco Elver <elver@...gle.com>,
        Evgenii Stepanov <eugenis@...gle.com>,
        Elena Petrova <lenaptr@...gle.com>,
        Branislav Rankov <Branislav.Rankov@....com>,
        Kevin Brodsky <kevin.brodsky@....com>,
        Will Deacon <will.deacon@....com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Linux Memory Management List <linux-mm@...ck.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 07/37] kasan: split out shadow.c from common.c

> diff --git a/mm/kasan/shadow.c b/mm/kasan/shadow.c
> new file mode 100644
> index 000000000000..4888084ecdfc
> --- /dev/null
> +++ b/mm/kasan/shadow.c
> @@ -0,0 +1,509 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * This file contains KASAN shadow runtime code.

I think it will be nice to mention here which KASAN modes are going to
use this file.



> +#undef memset
> +void *memset(void *addr, int c, size_t len)
> +{
> +       if (!check_memory_region((unsigned long)addr, len, true, _RET_IP_))
> +               return NULL;
> +
> +       return __memset(addr, c, len);
> +}
> +

OOC, don't we need memset and memmove implementations in the
hardware-based mode as well?


> +       region_start = ALIGN(start, PAGE_SIZE * KASAN_GRANULE_SIZE);
> +       region_end = ALIGN_DOWN(end, PAGE_SIZE * KASAN_GRANULE_SIZE);

"PAGE_SIZE * KASAN_GRANULE_SIZE" seems to be a common thing, can we
give it a name?