Messages in this thread | | | Subject | Re: [PATCH v2 3/3] kasan: arm64: Fix pcpu_page_first_chunk crash with KASAN_VMALLOC | From | Kefeng Wang <> | Date | Thu, 22 Jul 2021 20:14:33 +0800 |
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On 2021/7/22 19:00, Marco Elver wrote: > On Tue, Jul 20, 2021 at 10:51AM +0800, 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. >> >> Signed-off-by: Kefeng Wang <wangkefeng.wang@huawei.com> > Acked-by: Marco Elver <elver@google.com> > > for the kasan bits. Thanks Marco.
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