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9a0732efa7
linux/arch/arm64
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Lecopzer Chen 9a0732efa7 arm64: kasan: don't populate vmalloc area for CONFIG_KASAN_VMALLOC 
Linux support KAsan for VMALLOC since commit 3c5c3cfb9e
("kasan: support backing vmalloc space with real shadow memory")

Like how the MODULES_VADDR does now, just not to early populate
the VMALLOC_START between VMALLOC_END.

Before:

MODULE_VADDR: no mapping, no zero shadow at init
VMALLOC_VADDR: backed with zero shadow at init

After:

MODULE_VADDR: no mapping, no zero shadow at init
VMALLOC_VADDR: no mapping, no zero shadow at init

Thus the mapping will get allocated on demand by the core function
of KASAN_VMALLOC.

  -----------  vmalloc_shadow_start
 |           |
 |           |
 |           | <= non-mapping
 |           |
 |           |
 |-----------|
 |///////////|<- kimage shadow with page table mapping.
 |-----------|
 |           |
 |           | <= non-mapping
 |           |
 ------------- vmalloc_shadow_end
 |00000000000|
 |00000000000| <= Zero shadow
 |00000000000|
 ------------- KASAN_SHADOW_END

Signed-off-by: Lecopzer Chen <lecopzer.chen@mediatek.com>
Acked-by: Andrey Konovalov <andreyknvl@gmail.com>
Tested-by: Andrey Konovalov <andreyknvl@gmail.com>
Tested-by: Ard Biesheuvel <ardb@kernel.org>
Link: https://lore.kernel.org/r/20210324040522.15548-2-lecopzer.chen@mediatek.com
[catalin.marinas@arm.com: add a build check on VMALLOC_START != MODULES_END]
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2021-03-29 12:34:00 +01:00
..
boot regulator: Updates for v5.12 2021-02-22 09:16:38 -08:00
configs Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/hid/hid 2021-02-23 14:52:22 -08:00
crypto crypto: arm64/crc-t10dif - move NEON yield to C code 2021-02-10 17:55:58 +11:00
include More fixes for ARM and x86. 2021-03-14 12:35:02 -07:00
kernel More fixes for ARM and x86. 2021-03-14 12:35:02 -07:00
kvm More fixes for ARM and x86. 2021-03-14 12:35:02 -07:00
lib arm64: kasan: simplify and inline MTE functions 2021-02-26 09:41:03 -08:00
mm arm64: kasan: don't populate vmalloc area for CONFIG_KASAN_VMALLOC 2021-03-29 12:34:00 +01:00
net bpf: Rename BPF_XADD and prepare to encode other atomics in .imm 2021-01-14 18:34:29 -08:00
xen
Kbuild
Kconfig arm64/mm: Drop THP conditionality from FORCE_MAX_ZONEORDER 2021-03-08 13:03:54 +00:00
Kconfig.debug
Kconfig.platforms Updates for the irq subsystem: 2021-02-21 11:53:06 -08:00
Makefile arm64: do not descend to vdso directories twice 2021-01-20 12:18:46 +00:00