Messages in this thread | | | Subject | Re: [PATCH v3 3/3] kasan: arm64: Fix pcpu_page_first_chunk crash with KASAN_VMALLOC | From | Kefeng Wang <> | Date | Mon, 9 Aug 2021 21:34:57 +0800 |
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On 2021/8/9 19:21, Marco Elver wrote: > On Mon, 9 Aug 2021 at 13:10, Kefeng Wang <wangkefeng.wang@huawei.com> wrote: >> >> On 2021/8/9 17:37, Kefeng Wang wrote: >>> With KASAN_VMALLOC and NEED_PER_CPU_PAGE_FIRST_CHUNK, it crashs, >>> >>> Unable to handle kernel paging request at virtual address ffff7000028f2000 >>> ... >>> swapper pgtable: 64k pages, 48-bit VAs, pgdp=0000000042440000 >>> [ffff7000028f2000] pgd=000000063e7c0003, p4d=000000063e7c0003, pud=000000063e7c0003, pmd=000000063e7b0003, pte=0000000000000000 >>> Internal error: Oops: 96000007 [#1] PREEMPT SMP >>> Modules linked in: >>> CPU: 0 PID: 0 Comm: swapper Not tainted 5.13.0-rc4-00003-gc6e6e28f3f30-dirty #62 >>> Hardware name: linux,dummy-virt (DT) >>> pstate: 200000c5 (nzCv daIF -PAN -UAO -TCO BTYPE=--) >>> pc : kasan_check_range+0x90/0x1a0 >>> lr : memcpy+0x88/0xf4 >>> sp : ffff80001378fe20 >>> ... >>> Call trace: >>> kasan_check_range+0x90/0x1a0 >>> pcpu_page_first_chunk+0x3f0/0x568 >>> setup_per_cpu_areas+0xb8/0x184 >>> start_kernel+0x8c/0x328 >>> >>> The vm area used in vm_area_register_early() has no kasan shadow memory, >>> Let's add a new kasan_populate_early_vm_area_shadow() function to populate >>> the vm area shadow memory to fix the issue. >> Should add Acked-by: Marco Elver <elver@google.com> [for KASAN parts] , > My Ack is still valid, thanks for noting. Thanks, Marco ;)
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