From: Ard Biesheuvel <[email protected]> The zero page should contain only zero bytes, and so mapping it read-write is unnecessary. Move it to __ro_after_init instead.
Signed-off-by: Ard Biesheuvel <[email protected]> --- arch/arm64/mm/mmu.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/arch/arm64/mm/mmu.c b/arch/arm64/mm/mmu.c index 2a18637ecc15..d978b07ab7b8 100644 --- a/arch/arm64/mm/mmu.c +++ b/arch/arm64/mm/mmu.c @@ -68,7 +68,8 @@ long __section(".mmuoff.data.write") __early_cpu_boot_status; * Empty_zero_page is a special page that is used for zero-initialized data * and COW. */ -unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)] __page_aligned_bss; +unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)] + __ro_after_init __aligned(PAGE_SIZE); EXPORT_SYMBOL(empty_zero_page); static DEFINE_SPINLOCK(swapper_pgdir_lock); -- 2.52.0.457.g6b5491de43-goog
