From: Kefeng Wang <wangkefeng.wang@huawei.com>
To: Marco Elver <elver@google.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>,
Will Deacon <will@kernel.org>,
Andrey Ryabinin <ryabinin.a.a@gmail.com>,
Andrey Konovalov <andreyknvl@gmail.com>,
Dmitry Vyukov <dvyukov@google.com>,
<linux-arm-kernel@lists.infradead.org>,
<linux-kernel@vger.kernel.org>, <kasan-dev@googlegroups.com>,
<linux-mm@kvack.org>
Subject: Re: [PATCH v2 3/3] kasan: arm64: Fix pcpu_page_first_chunk crash with KASAN_VMALLOC
Date: Thu, 22 Jul 2021 20:14:33 +0800 [thread overview]
Message-ID: <99a9334e-ccda-dde9-954f-6717946324f8@huawei.com> (raw)
In-Reply-To: <YPlP6h4O1WA0NVDs@elver.google.com>
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.
next prev parent reply other threads:[~2021-07-22 12:14 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-07-20 2:51 [PATCH v2 0/3] arm64: support page mapping percpu first chunk allocator Kefeng Wang
2021-07-20 2:51 ` [PATCH v2 1/3] vmalloc: Choose a better start address in vm_area_register_early() Kefeng Wang
2021-08-01 15:23 ` Catalin Marinas
2021-08-02 2:39 ` Kefeng Wang
2021-08-04 11:14 ` Catalin Marinas
2021-08-05 12:46 ` Kefeng Wang
2021-07-20 2:51 ` [PATCH v2 2/3] arm64: Support page mapping percpu first chunk allocator Kefeng Wang
2021-08-01 15:53 ` Catalin Marinas
2021-08-02 2:47 ` Kefeng Wang
2021-07-20 2:51 ` [PATCH v2 3/3] kasan: arm64: Fix pcpu_page_first_chunk crash with KASAN_VMALLOC Kefeng Wang
2021-07-22 11:00 ` Marco Elver
2021-07-22 12:14 ` Kefeng Wang [this message]
2021-07-26 1:19 ` [PATCH v2 0/3] arm64: support page mapping percpu first chunk allocator Kefeng Wang
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