From: Christophe Leroy christophe.leroy@c-s.fr
commit 663c0c9496a69f80011205ba3194049bcafd681d upstream.
When loading modules, from time to time an Oops is encountered during the init of shadow area for globals. This is due to the last page not always being mapped depending on the exact distance between the start and the end of the shadow area and the alignment with the page addresses.
Fix this by aligning the starting address with the page address.
Fixes: 2edb16efc899 ("powerpc/32: Add KASAN support") Cc: stable@vger.kernel.org # v5.2+ Reported-by: Erhard F. erhard_f@mailbox.org Signed-off-by: Christophe Leroy christophe.leroy@c-s.fr Signed-off-by: Michael Ellerman mpe@ellerman.id.au Link: https://lore.kernel.org/r/4f887e9b77d0d725cbb52035c7ece485c1c5fc14.156536188... Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- arch/powerpc/mm/kasan/kasan_init_32.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- a/arch/powerpc/mm/kasan/kasan_init_32.c +++ b/arch/powerpc/mm/kasan/kasan_init_32.c @@ -87,7 +87,7 @@ static int __ref kasan_init_region(void if (!slab_is_available()) block = memblock_alloc(k_end - k_start, PAGE_SIZE);
- for (k_cur = k_start; 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_offset(pud_offset(pgd_offset_k(k_cur), k_cur), k_cur); void *va = block ? block + k_cur - k_start : kasan_get_one_page(); pte_t pte = pfn_pte(PHYS_PFN(__pa(va)), PAGE_KERNEL);