[PATCH 5.11 454/601] powerpc/64s: Use htab_convert_pte_flags() in hash__mark_rodata_ro()

Greg Kroah-Hartman
2021-05-12T17:55:35Z

From: Michael Ellerman <mpe@ellerman.id.au>

[ Upstream commit 2c02e656a29d5f64193eb93da92781bcf0517146 ]

In hash__mark_rodata_ro() we pass the raw PP_RXXX value to
hash__change_memory_range(). That has the effect of setting the key to
zero, because PP_RXXX contains no key value.

Fix it by using htab_convert_pte_flags(), which knows how to convert a
pgprot into a pp value, including the key.

Fixes: d94b827e89dc ("powerpc/book3s64/kuap: Use Key 3 for kernel mapping with hash translation")
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Reviewed-by: Daniel Axtens <dja@axtens.net>
Link: https://lore.kernel.org/r/20210331003845.216246-3-mpe@ellerman.id.au
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
arch/powerpc/mm/book3s64/hash_pgtable.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/arch/powerpc/mm/book3s64/hash_pgtable.c b/arch/powerpc/mm/book3s64/hash_pgtable.c
index 567e0c6b3978..03819c259f0a 100644
--- a/arch/powerpc/mm/book3s64/hash_pgtable.c
+++ b/arch/powerpc/mm/book3s64/hash_pgtable.c
@@ -428,12 +428,14 @@ static bool hash__change_memory_range(unsigned long start, unsigned long end,

void hash__mark_rodata_ro(void)
{
- unsigned long start, end;
+ unsigned long start, end, pp;

start = (unsigned long)_stext;
end = (unsigned long)__init_begin;

- WARN_ON(!hash__change_memory_range(start, end, PP_RXXX));
+ pp = htab_convert_pte_flags(pgprot_val(PAGE_KERNEL_ROX), HPTE_USE_KERNEL_KEY);
+
+ WARN_ON(!hash__change_memory_range(start, end, pp));
}

void hash__mark_initmem_nx(void)
--
2.30.2