ARM: 9202/1: kasan: support CONFIG_KASAN_VMALLOC
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>
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@ -75,6 +75,7 @@ config ARM
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select HAVE_ARCH_KFENCE if MMU && !XIP_KERNEL
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select HAVE_ARCH_KGDB if !CPU_ENDIAN_BE32 && MMU
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select HAVE_ARCH_KASAN if MMU && !XIP_KERNEL
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select HAVE_ARCH_KASAN_VMALLOC if HAVE_ARCH_KASAN
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select HAVE_ARCH_MMAP_RND_BITS if MMU
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select HAVE_ARCH_PFN_VALID
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select HAVE_ARCH_SECCOMP
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@ -236,7 +236,11 @@ void __init kasan_init(void)
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clear_pgds(KASAN_SHADOW_START, KASAN_SHADOW_END);
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kasan_populate_early_shadow(kasan_mem_to_shadow((void *)VMALLOC_START),
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if (!IS_ENABLED(CONFIG_KASAN_VMALLOC))
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kasan_populate_early_shadow(kasan_mem_to_shadow((void *)VMALLOC_START),
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kasan_mem_to_shadow((void *)VMALLOC_END));
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kasan_populate_early_shadow(kasan_mem_to_shadow((void *)VMALLOC_END),
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kasan_mem_to_shadow((void *)-1UL) + 1);
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for_each_mem_range(i, &pa_start, &pa_end) {
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