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| author | Balbir Singh <bsingharora@gmail.com> | 2017-06-28 19:04:08 +0200 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2017-07-04 03:35:16 +0200 |
| commit | cd65d69713349fc7b33fa9de2b32989b99c9fb39 (patch) | |
| tree | 31d67b092228886108a0339c6953064c01b2a3b0 /arch/powerpc/mm/pgtable_64.c | |
| parent | powerpc/vmlinux.lds: Align __init_begin to 16M (diff) | |
| download | linux-cd65d69713349fc7b33fa9de2b32989b99c9fb39.tar.xz linux-cd65d69713349fc7b33fa9de2b32989b99c9fb39.zip | |
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 <bsingharora@gmail.com>
[mpe: Make the warning louder when we don't have MMU_FTR_KERNEL_RO]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'arch/powerpc/mm/pgtable_64.c')
| -rw-r--r-- | arch/powerpc/mm/pgtable_64.c | 13 |
1 files changed, 13 insertions, 0 deletions
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 |