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UPSTREAM: ARM: 9202/1: kasan: support CONFIG_KASAN_VMALLOC

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Simply make shadow of vmalloc area mapped on demand.

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.

Signed-off-by: Lecopzer Chen <lecopzer.chen@mediatek.com>
Tested-by: Linus Walleij <linus.walleij@linaro.org>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>

Bug: 275526617
(cherry picked from commit 565cbaad83)
Signed-off-by: Lecopzer Chen <lecopzer.chen@mediatek.com>
Change-Id: Ic2cb62e294dad96ba5a98b2ca48fa5efea2c2e57
This commit is contained in:
Lecopzer Chen
2022-04-27 15:29:01 +01:00
committed by Treehugger Robot
parent 09c11ea376
commit 8f11c7aa84
2 changed files with 6 additions and 1 deletions
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1
arch/arm/Kconfig
View File

@@ -72,6 +72,7 @@ config ARM
select HAVE_ARCH_JUMP_LABEL if !XIP_KERNEL && !CPU_ENDIAN_BE32 && MMU
select HAVE_ARCH_KGDB if !CPU_ENDIAN_BE32 && MMU
select HAVE_ARCH_KASAN if MMU && !XIP_KERNEL
select HAVE_ARCH_KASAN_VMALLOC if HAVE_ARCH_KASAN
select HAVE_ARCH_MMAP_RND_BITS if MMU
select HAVE_ARCH_PFN_VALID
select HAVE_ARCH_SECCOMP

6
arch/arm/mm/kasan_init.c
View File

@@ -236,7 +236,11 @@ void __init kasan_init(void)
clear_pgds(KASAN_SHADOW_START, KASAN_SHADOW_END);
kasan_populate_early_shadow(kasan_mem_to_shadow((void *)VMALLOC_START),
if (!IS_ENABLED(CONFIG_KASAN_VMALLOC))
kasan_populate_early_shadow(kasan_mem_to_shadow((void *)VMALLOC_START),
kasan_mem_to_shadow((void *)VMALLOC_END));
kasan_populate_early_shadow(kasan_mem_to_shadow((void *)VMALLOC_END),
kasan_mem_to_shadow((void *)-1UL) + 1);
for_each_mem_range(i, &pa_start, &pa_end) {