From cd65d69713349fc7b33fa9de2b32989b99c9fb39 Mon Sep 17 00:00:00 2001 From: Balbir Singh Date: Thu, 29 Jun 2017 03:04:08 +1000 Subject: powerpc/mm/hash: Implement mark_rodata_ro() for hash With hash we update the bolted pte to mark it read-only. We rely on the MMU_FTR_KERNEL_RO to generate the correct permissions for read-only text. The radix implementation just prints a warning in this implementation Signed-off-by: Balbir Singh [mpe: Make the warning louder when we don't have MMU_FTR_KERNEL_RO] Signed-off-by: Michael Ellerman --- arch/powerpc/mm/pgtable_64.c | 13 +++++++++++++ 1 file changed, 13 insertions(+) (limited to 'arch/powerpc/mm/pgtable_64.c') diff --git a/arch/powerpc/mm/pgtable_64.c b/arch/powerpc/mm/pgtable_64.c index bce0ed50789c..fc2e6def2eb7 100644 --- a/arch/powerpc/mm/pgtable_64.c +++ b/arch/powerpc/mm/pgtable_64.c @@ -491,3 +491,16 @@ void mmu_partition_table_set_entry(unsigned int lpid, unsigned long dw0, } EXPORT_SYMBOL_GPL(mmu_partition_table_set_entry); #endif /* CONFIG_PPC_BOOK3S_64 */ + +#ifdef CONFIG_STRICT_KERNEL_RWX +void mark_rodata_ro(void) +{ + if (!mmu_has_feature(MMU_FTR_KERNEL_RO)) { + pr_warn("Warning: Unable to mark rodata read only on this CPU.\n"); + return; + } + + if (!radix_enabled()) + hash__mark_rodata_ro(); +} +#endif -- cgit v1.2.3