The original x86_64-only version of KASAN mapped its zero page
read-only, but this got lost when the code was generalised and
ported to arm64, since, at the time, the PAGE_KERNEL_RO define
did not exist. It has been added to arm64 in the mean time, so
let's use it.
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@xxxxxxxxxx>
---
mm/kasan/kasan_init.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/mm/kasan/kasan_init.c b/mm/kasan/kasan_init.c
index 3f9a41cf0ac6..8726a92604ad 100644
--- a/mm/kasan/kasan_init.c
+++ b/mm/kasan/kasan_init.c
@@ -49,7 +49,7 @@ static void __init zero_pte_populate(pmd_t *pmd, unsigned long addr,
pte_t *pte = pte_offset_kernel(pmd, addr);
pte_t zero_pte;
- zero_pte = pfn_pte(PFN_DOWN(__pa(kasan_zero_page)), PAGE_KERNEL);
+ zero_pte = pfn_pte(PFN_DOWN(__pa(kasan_zero_page)), PAGE_KERNEL_RO);
zero_pte = pte_wrprotect(zero_pte);
while (addr + PAGE_SIZE <= end) {
--
2.5.0
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