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| author | Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com> | 2020-11-27 10:14:10 +0530 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2020-12-04 01:01:25 +1100 |
| commit | d94b827e89dc3f92cd871d10f4992a6bd3c861e5 (patch) | |
| tree | cf3fd6317c4c6b93f539381c2bd0d081f272b88c /arch/powerpc/mm/book3s64/hash_pgtable.c | |
| parent | d5b810b5c938e73fd21b2b05ef6a79837eeaa305 (diff) | |
| download | linux-stable-d94b827e89dc3f92cd871d10f4992a6bd3c861e5.tar.gz linux-stable-d94b827e89dc3f92cd871d10f4992a6bd3c861e5.tar.bz2 linux-stable-d94b827e89dc3f92cd871d10f4992a6bd3c861e5.zip | |
powerpc/book3s64/kuap: Use Key 3 for kernel mapping with hash translation
This patch updates kernel hash page table entries to use storage key 3
for its mapping. This implies all kernel access will now use key 3 to
control READ/WRITE. The patch also prevents the allocation of key 3 from
userspace and UAMOR value is updated such that userspace cannot modify key 3.
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
Reviewed-by: Sandipan Das <sandipan@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20201127044424.40686-9-aneesh.kumar@linux.ibm.com
Diffstat (limited to 'arch/powerpc/mm/book3s64/hash_pgtable.c')
| -rw-r--r-- | arch/powerpc/mm/book3s64/hash_pgtable.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/powerpc/mm/book3s64/hash_pgtable.c b/arch/powerpc/mm/book3s64/hash_pgtable.c index fd9c7f91b092..567e0c6b3978 100644 --- a/arch/powerpc/mm/book3s64/hash_pgtable.c +++ b/arch/powerpc/mm/book3s64/hash_pgtable.c @@ -443,7 +443,7 @@ void hash__mark_initmem_nx(void) start = (unsigned long)__init_begin; end = (unsigned long)__init_end; - pp = htab_convert_pte_flags(pgprot_val(PAGE_KERNEL)); + pp = htab_convert_pte_flags(pgprot_val(PAGE_KERNEL), HPTE_USE_KERNEL_KEY); WARN_ON(!hash__change_memory_range(start, end, pp)); } |