diff options
Diffstat (limited to 'arch/powerpc/mm/pgtable-hash64.c')
| -rw-r--r-- | arch/powerpc/mm/pgtable-hash64.c | 36 |
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 |