linux-kernel - [PATCH v5 0/2] arm: kasan: support CONFIG_KASAN

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Date:   Wed, 27 Apr 2022 17:59:14 +0800
From:   Lecopzer Chen <lecopzer.chen@...iatek.com>
To:     <linus.walleij@...aro.org>, <linux@...linux.org.uk>
CC:     <lecopzer.chen@...iatek.com>, <andreyknvl@...il.com>,
        <anshuman.khandual@....com>, <ardb@...nel.org>, <arnd@...db.de>,
        <dvyukov@...gle.com>, <geert+renesas@...der.be>,
        <glider@...gle.com>, <kasan-dev@...glegroups.com>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <lukas.bulwahn@...il.com>,
        <mark.rutland@....com>, <masahiroy@...nel.org>,
        <matthias.bgg@...il.com>, <rmk+kernel@...linux.org.uk>,
        <ryabinin.a.a@...il.com>, <yj.chiang@...iatek.com>
Subject: [PATCH v5 0/2] arm: kasan: support CONFIG_KASAN_VMALLOC

Since the framework of KASAN_VMALLOC is well-developed,
It's easy to support for ARM that simply not to map shadow of VMALLOC
area on kasan_init.

Since the virtual address of vmalloc for Arm is also between
MODULE_VADDR and 0x100000000 (ZONE_HIGHMEM), which means the shadow
address has already included between KASAN_SHADOW_START and
KASAN_SHADOW_END.
Thus we need to change nothing for memory map of Arm.

This can fix ARM_MODULE_PLTS with KASan, support KASan for higmem
and support CONFIG_VMAP_STACK with KASan.

Test on
1. Qemu with memory 2G and vmalloc=500M for 3G/1G mapping.
2. Qemu with memory 2G and vmalloc=500M for 3G/1G mapping + LPAE.
3. Qemu with memory 2G and vmalloc=500M for 2G/2G mapping.

v5:
    rebase on 5.18-rc4

v4:
    rebase on 5.17-rc8.
    remove simple doc for "arm: kasan: support CONFIG_KASAN_VMALLOC"
    rewrite the description for VMAP_STACK

https://lore.kernel.org/lkml/20220315090157.27001-1-lecopzer.chen@mediatek.com/

v3:
    rebase on 5.17-rc5.
    Add simple doc for "arm: kasan: support CONFIG_KASAN_VMALLOC"
    Tweak commit message.

https://lore.kernel.org/lkml/20220227134726.27584-1-lecopzer.chen@mediatek.com/

v2:
    rebase on 5.17-rc3

Lecopzer Chen (2):
  arm: kasan: support CONFIG_KASAN_VMALLOC
  arm: kconfig: fix MODULE_PLTS for KASAN with KASAN_VMALLOC

 arch/arm/Kconfig         | 2 ++
 arch/arm/mm/kasan_init.c | 6 +++++-
 2 files changed, 7 insertions(+), 1 deletion(-)

-- 
2.18.0