From: Christophe Leroy christophe.leroy@csgroup.eu
commit 41ea93cf7ba4e0f0cc46ebfdda8b6ff27c67bc91 upstream.
Doing kasan pages allocation in MMU_init is too early, kernel doesn't have access yet to the entire memory space and memblock_alloc() fails when the kernel is a bit big.
Do it from kasan_init() instead.
Fixes: 2edb16efc899 ("powerpc/32: Add KASAN support") Fixes: d2a91cef9bbd ("powerpc/kasan: Fix shadow pages allocation failure") Cc: stable@vger.kernel.org Reported-by: Erhard F. erhard_f@mailbox.org Signed-off-by: Christophe Leroy christophe.leroy@csgroup.eu Signed-off-by: Michael Ellerman mpe@ellerman.id.au Link: https://bugzilla.kernel.org/show_bug.cgi?id=208181 Link: https://lore.kernel.org/r/63048fcea8a1c02f75429ba3152f80f7853f87fc.159369070... Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- arch/powerpc/mm/kasan/kasan_init_32.c | 25 +++++++++++++------------ 1 file changed, 13 insertions(+), 12 deletions(-)
--- a/arch/powerpc/mm/kasan/kasan_init_32.c +++ b/arch/powerpc/mm/kasan/kasan_init_32.c @@ -120,11 +120,24 @@ static void __init kasan_unmap_early_sha void __init kasan_mmu_init(void) { int ret; + + if (early_mmu_has_feature(MMU_FTR_HPTE_TABLE) || + IS_ENABLED(CONFIG_KASAN_VMALLOC)) { + ret = kasan_init_shadow_page_tables(KASAN_SHADOW_START, KASAN_SHADOW_END); + + if (ret) + panic("kasan: kasan_init_shadow_page_tables() failed"); + } +} + +void __init kasan_init(void) +{ struct memblock_region *reg;
for_each_memblock(memory, reg) { phys_addr_t base = reg->base; phys_addr_t top = min(base + reg->size, total_lowmem); + int ret;
if (base >= top) continue; @@ -134,18 +147,6 @@ void __init kasan_mmu_init(void) panic("kasan: kasan_init_region() failed"); }
- if (early_mmu_has_feature(MMU_FTR_HPTE_TABLE) || - IS_ENABLED(CONFIG_KASAN_VMALLOC)) { - ret = kasan_init_shadow_page_tables(KASAN_SHADOW_START, KASAN_SHADOW_END); - - if (ret) - panic("kasan: kasan_init_shadow_page_tables() failed"); - } - -} - -void __init kasan_init(void) -{ kasan_remap_early_shadow_ro();
clear_page(kasan_early_shadow_page);