linux-kernel - Re: [PATCH v2 0/4] arm64: kasan: support CONFIG_KASAN

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Date:   Fri, 22 Jan 2021 19:05:01 +0000
From:   Will Deacon <will@...nel.org>
To:     Andrey Konovalov <andreyknvl@...gle.com>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Linux Memory Management List <linux-mm@...ck.org>,
        kasan-dev <kasan-dev@...glegroups.com>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Dan Williams <dan.j.williams@...el.com>,
        Andrey Ryabinin <aryabinin@...tuozzo.com>,
        Alexander Potapenko <glider@...gle.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        "moderated list:ARM/Mediatek SoC..." 
        <linux-mediatek@...ts.infradead.org>, yj.chiang@...iatek.com,
        Catalin Marinas <catalin.marinas@....com>,
        Ard Biesheuvel <ardb@...nel.org>,
        Mark Brown <broonie@...nel.org>,
        Guenter Roeck <linux@...ck-us.net>, rppt@...nel.org,
        tyhicks@...ux.microsoft.com, Robin Murphy <robin.murphy@....com>,
        Vincenzo Frascino <vincenzo.frascino@....com>,
        gustavoars@...nel.org, Lecopzer Chen <lecopzer@...il.com>,
        Lecopzer Chen <lecopzer.chen@...iatek.com>
Subject: Re: [PATCH v2 0/4] arm64: kasan: support CONFIG_KASAN_VMALLOC

On Thu, Jan 21, 2021 at 06:44:14PM +0100, Andrey Konovalov wrote:
> On Sat, Jan 9, 2021 at 11:33 AM Lecopzer Chen <lecopzer@...il.com> wrote:
> >
> > Linux supports KAsan for VMALLOC since commit 3c5c3cfb9ef4da9
> > ("kasan: support backing vmalloc space with real shadow memory")
> >
> > Acroding to how x86 ported it [1], they early allocated p4d and pgd,
> > but in arm64 I just simulate how KAsan supports MODULES_VADDR in arm64
> > by not to populate the vmalloc area except for kimg address.
> >
> > Test environment:
> >     4G and 8G Qemu virt,
> >     39-bit VA + 4k PAGE_SIZE with 3-level page table,
> >     test by lib/test_kasan.ko and lib/test_kasan_module.ko
> >
> > It also works in Kaslr with CONFIG_RANDOMIZE_MODULE_REGION_FULL
> > and randomize module region inside vmalloc area.
> >
> >
> > [1]: commit 0609ae011deb41c ("x86/kasan: support KASAN_VMALLOC")
> >
> > Signed-off-by: Lecopzer Chen <lecopzer.chen@...iatek.com>
> > Acked-by: Andrey Konovalov <andreyknvl@...gle.com>
> > Tested-by: Andrey Konovalov <andreyknvl@...gle.com>
> >
> >
> > v2 -> v1
> >         1. kasan_init.c tweak indent
> >         2. change Kconfig depends only on HAVE_ARCH_KASAN
> >         3. support randomized module region.
> >
> > v1:
> > https://lore.kernel.org/lkml/20210103171137.153834-1-lecopzer@gmail.com/
> >
> > Lecopzer Chen (4):
> >   arm64: kasan: don't populate vmalloc area for CONFIG_KASAN_VMALLOC
> >   arm64: kasan: abstract _text and _end to KERNEL_START/END
> >   arm64: Kconfig: support CONFIG_KASAN_VMALLOC
> >   arm64: kaslr: support randomized module area with KASAN_VMALLOC
> >
> >  arch/arm64/Kconfig         |  1 +
> >  arch/arm64/kernel/kaslr.c  | 18 ++++++++++--------
> >  arch/arm64/kernel/module.c | 16 +++++++++-------
> >  arch/arm64/mm/kasan_init.c | 29 +++++++++++++++++++++--------
> >  4 files changed, 41 insertions(+), 23 deletions(-)
> >
> > --
> > 2.25.1
> >
> 
> Hi Will,
> 
> Could you PTAL at the arm64 changes?

Sorry, wanted to get to this today but I ran out of time in the end. On the
list for next week!

Will