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

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Date:   Sat,  9 Jan 2021 18:32:48 +0800
From:   Lecopzer Chen <lecopzer@...il.com>
To:     linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        kasan-dev@...glegroups.com, linux-arm-kernel@...ts.infradead.org
Cc:     dan.j.williams@...el.com, aryabinin@...tuozzo.com,
        glider@...gle.com, dvyukov@...gle.com, akpm@...ux-foundation.org,
        linux-mediatek@...ts.infradead.org, yj.chiang@...iatek.com,
        will@...nel.org, catalin.marinas@....com, ardb@...nel.org,
        andreyknvl@...gle.com, broonie@...nel.org, linux@...ck-us.net,
        rppt@...nel.org, tyhicks@...ux.microsoft.com, robin.murphy@....com,
        vincenzo.frascino@....com, gustavoars@...nel.org,
        Lecopzer Chen <lecopzer@...il.com>,
        Lecopzer Chen <lecopzer.chen@...iatek.com>
Subject: [PATCH v2 0/4] arm64: kasan: support CONFIG_KASAN_VMALLOC

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