[PATCH] powerpc/kasan: Fix kasan_remap_early_shadow_ro()

[PATCH] powerpc/kasan: Fix kasan_remap_early_shadow_ro()

[Christophe Leroy]

At the moment kasan_remap_early_shadow_ro() does nothing, because
k_end is 0 and k_cur < 0 is always true.

Change the test to k_cur != k_end, as done in
kasan_init_shadow_page_tables()

Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Fixes: cbd18991e24f ("powerpc/mm: Fix an Oops in kasan_mmu_init()")
Cc: stable@vger.kernel.org
---
 arch/powerpc/mm/kasan/kasan_init_32.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/powerpc/mm/kasan/kasan_init_32.c b/arch/powerpc/mm/kasan/kasan_init_32.c
index f19526e7d3dc..1a29cf469903 100644
--- a/arch/powerpc/mm/kasan/kasan_init_32.c
+++ b/arch/powerpc/mm/kasan/kasan_init_32.c
@@ -101,7 +101,7 @@ static void __init kasan_remap_early_shadow_ro(void)
 
 	kasan_populate_pte(kasan_early_shadow_pte, prot);
 
-	for (k_cur = k_start & PAGE_MASK; k_cur < k_end; k_cur += PAGE_SIZE) {
+	for (k_cur = k_start & PAGE_MASK; k_cur != k_end; k_cur += PAGE_SIZE) {
 		pmd_t *pmd = pmd_ptr_k(k_cur);
 		pte_t *ptep = pte_offset_kernel(pmd, k_cur);
 
-- 
2.25.0

Re: [PATCH] powerpc/kasan: Fix kasan_remap_early_shadow_ro()

[Michael Ellerman]

On Fri, 2020-03-06 at 15:09:40 UTC, Christophe Leroy wrote:
> At the moment kasan_remap_early_shadow_ro() does nothing, because
> k_end is 0 and k_cur < 0 is always true.
> 
> Change the test to k_cur != k_end, as done in
> kasan_init_shadow_page_tables()
> 
> Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
> Fixes: cbd18991e24f ("powerpc/mm: Fix an Oops in kasan_mmu_init()")
> Cc: stable@vger.kernel.org

Applied to powerpc next, thanks.

https://git.kernel.org/powerpc/c/af92bad615be75c6c0d1b1c5b48178360250a187

cheers