Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > linux.kernel > #1330500

Re: [PATCH v2] arm64: disable kasan when accessing frame->fp in unwind_frame

Show all headers | View raw

On 2/9/2016 8:54 AM, Will Deacon wrote:
> On Mon, Feb 08, 2016 at 09:13:09AM -0800, Yang Shi wrote:
>> When boot arm64 kernel with KASAN enabled, the below error is reported by
>> kasan:
>>
>> BUG: KASAN: out-of-bounds in unwind_frame+0xec/0x260 at addr ffffffc064d57ba0
>> Read of size 8 by task pidof/499
>> page:ffffffbdc39355c0 count:0 mapcount:0 mapping:          (null) index:0x0
>> flags: 0x0()
>> page dumped because: kasan: bad access detected
>> CPU: 2 PID: 499 Comm: pidof Not tainted 4.5.0-rc1 #119
>> Hardware name: Freescale Layerscape 2085a RDB Board (DT)
>> Call trace:
>> [<ffffffc00008d078>] dump_backtrace+0x0/0x290
>> [<ffffffc00008d32c>] show_stack+0x24/0x30
>> [<ffffffc0006a981c>] dump_stack+0x8c/0xd8
>> [<ffffffc0002e4400>] kasan_report_error+0x558/0x588
>> [<ffffffc0002e4958>] kasan_report+0x60/0x70
>> [<ffffffc0002e3188>] __asan_load8+0x60/0x78
>> [<ffffffc00008c92c>] unwind_frame+0xec/0x260
>> [<ffffffc000087e60>] get_wchan+0x110/0x160
>> [<ffffffc0003b647c>] do_task_stat+0xb44/0xb68
>> [<ffffffc0003b7730>] proc_tgid_stat+0x40/0x50
>> [<ffffffc0003ac840>] proc_single_show+0x88/0xd8
>> [<ffffffc000345be8>] seq_read+0x370/0x770
>> [<ffffffc00030aba0>] __vfs_read+0xc8/0x1d8
>> [<ffffffc00030c0ec>] vfs_read+0x94/0x168
>> [<ffffffc00030d458>] SyS_read+0xb8/0x128
>> [<ffffffc000086530>] el0_svc_naked+0x24/0x28
>> Memory state around the buggy address:
>>   ffffffc064d57a80: 00 00 00 00 00 00 00 00 f1 f1 f1 f1 00 00 f4 f4
>>   ffffffc064d57b00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>>> ffffffc064d57b80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>>                                    ^
>>   ffffffc064d57c00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>>   ffffffc064d57c80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>>
>> Since the shadow byte pointed by the report is 0, so it may mean it is just hit
>> oob in non-current task. So, disable the instrumentation to silence these
>> warnings.
>
> Curious, but how did you trigger this? I'm just trying to confirm that
> mainline is affected, but my machine boots happily with KASAN and STACKTRACE
> selected and I can cat /proc/self/{stack,stat} quite happily.
>
> What am I missing?

I'm using mainline 4.5-rc1 kernel with gcc 5.2. And, my rootfs is NFS 
mounted.

Not sure if other kernel configs, i.e tracing stuff will have impact on 
the trigger since I'm not using the defconfig.

Thanks,
Yang

>
> Will
>

Back to linux.kernel | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread

Thread

[PATCH v2] arm64: disable kasan when accessing frame->fp in unwind_frame Yang Shi <yang.shi@linaro.org> - 2016-02-08 18:40 +0100
  Re: [PATCH v2] arm64: disable kasan when accessing frame->fp in  unwind_frame Will Deacon <will.deacon@arm.com> - 2016-02-09 14:30 +0100
  Re: [PATCH v2] arm64: disable kasan when accessing frame->fp in  unwind_frame Andrey Ryabinin <aryabinin@virtuozzo.com> - 2016-02-09 14:50 +0100
  Re: [PATCH v2] arm64: disable kasan when accessing frame->fp in  unwind_frame Will Deacon <will.deacon@arm.com> - 2016-02-09 18:00 +0100
    Re: [PATCH v2] arm64: disable kasan when accessing frame->fp in  unwind_frame "Shi, Yang" <yang.shi@linaro.org> - 2016-02-09 18:20 +0100
      Re: [PATCH v2] arm64: disable kasan when accessing frame->fp in  unwind_frame Will Deacon <will.deacon@arm.com> - 2016-02-09 18:30 +0100
        Re: [PATCH v2] arm64: disable kasan when accessing frame->fp in  unwind_frame "Shi, Yang" <yang.shi@linaro.org> - 2016-02-09 18:40 +0100

csiph-web