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From: Kefeng Wang <wangkefeng.wang@huawei.com>
To: Marco Elver <elver@google.com>
Cc: <will@kernel.org>, <catalin.marinas@arm.com>,
<ryabinin.a.a@gmail.com>, <andreyknvl@gmail.com>,
<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 v3 3/3] kasan: arm64: Fix pcpu_page_first_chunk crash with KASAN_VMALLOC
Date: Mon, 9 Aug 2021 21:34:57 +0800 [thread overview]
Message-ID: <03828e22-9869-7c57-3ad0-f266a435e427@huawei.com> (raw)
In-Reply-To: <CANpmjNOM-fzk2_q9LNLgM1wSReHWj42MxHBeDBLg8Ga5vv8HhQ@mail.gmail.com>
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 ;)
next prev parent reply other threads:[~2021-08-09 13:35 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-08-09 9:37 [PATCH v3 0/3] arm64: support page mapping percpu first chunk allocator Kefeng Wang
2021-08-09 9:37 ` [PATCH v3 1/3] vmalloc: Choose a better start address in vm_area_register_early() Kefeng Wang
2021-08-25 17:59 ` Catalin Marinas
2021-08-27 8:36 ` Kefeng Wang
2021-08-09 9:37 ` [PATCH v3 2/3] arm64: Support page mapping percpu first chunk allocator Kefeng Wang
2021-08-25 18:08 ` Catalin Marinas
2021-08-09 9:37 ` [PATCH v3 3/3] kasan: arm64: Fix pcpu_page_first_chunk crash with KASAN_VMALLOC Kefeng Wang
2021-08-09 11:10 ` Kefeng Wang
2021-08-09 11:21 ` Marco Elver
2021-08-09 13:34 ` Kefeng Wang [this message]
2021-08-09 18:21 ` Andrey Konovalov
2021-08-12 6:07 ` [PATCH v3 0/3] arm64: support page mapping percpu first chunk allocator Kefeng Wang
2021-08-23 2:29 ` Kefeng Wang
2021-08-25 18:11 ` Catalin Marinas
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