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-rw-r--r--arch/powerpc/mm/pgtable-hash64.c36
1 files changed, 36 insertions, 0 deletions
diff --git a/arch/powerpc/mm/pgtable-hash64.c b/arch/powerpc/mm/pgtable-hash64.c
index a0facee58811..188b4107584d 100644
--- a/arch/powerpc/mm/pgtable-hash64.c
+++ b/arch/powerpc/mm/pgtable-hash64.c
@@ -11,8 +11,12 @@
#include <linux/sched.h>
#include <linux/mm_types.h>
+#include <linux/mm.h>
#include <asm/pgalloc.h>
+#include <asm/pgtable.h>
+#include <asm/sections.h>
+#include <asm/mmu.h>
#include <asm/tlb.h>
#include "mmu_decl.h"
@@ -419,3 +423,35 @@ int hash__has_transparent_hugepage(void)
return 1;
}
#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
+
+#ifdef CONFIG_STRICT_KERNEL_RWX
+void hash__mark_rodata_ro(void)
+{
+ unsigned long start = (unsigned long)_stext;
+ unsigned long end = (unsigned long)__init_begin;
+ unsigned long idx;
+ unsigned int step, shift;
+ unsigned long newpp = PP_RXXX;
+
+ shift = mmu_psize_defs[mmu_linear_psize].shift;
+ step = 1 << shift;
+
+ start = ((start + step - 1) >> shift) << shift;
+ end = (end >> shift) << shift;
+
+ pr_devel("marking ro start %lx, end %lx, step %x\n",
+ start, end, step);
+
+ if (start == end) {
+ pr_warn("could not set rodata ro, relocate the start"
+ " of the kernel to a 0x%x boundary\n", step);
+ return;
+ }
+
+ for (idx = start; idx < end; idx += step)
+ /* Not sure if we can do much with the return value */
+ mmu_hash_ops.hpte_updateboltedpp(newpp, idx, mmu_linear_psize,
+ mmu_kernel_ssize);
+
+}
+#endif