linux-kernel - [PATCH v3 0/2] arm: kasan: support CONFIG_KASAN

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Message-ID: <20220227134726.27584-1-lecopzer.chen@mediatek.com>
Date:   Sun, 27 Feb 2022 21:47:24 +0800
From:   Lecopzer Chen <lecopzer.chen@...iatek.com>
To:     <linus.walleij@...aro.org>, <linux-kernel@...r.kernel.org>
CC:     <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>, <lecopzer.chen@...iatek.com>,
        <linux-arm-kernel@...ts.infradead.org>, <linux@...linux.org.uk>,
        <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 v3 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 provide the first step to support CONFIG_VMAP_STACK with Arm.

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.

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

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/include/asm/kasan_def.h | 11 ++++++++++-
 arch/arm/mm/kasan_init.c         |  6 +++++-
 3 files changed, 17 insertions(+), 2 deletions(-)

-- 
2.25.1