linux-kernel - Re: 4.10 ACPI: UBSAN: Undefined behaviour in drivers/acpi/sysfs.c:757:33

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Date:   Fri, 10 Mar 2017 17:46:58 +0100
From:   "Rafael J. Wysocki" <rafael@...nel.org>
To:     Meelis Roos <mroos@...ux.ee>, Lv <lv.zheng@...el.com>
Cc:     Linux Kernel list <linux-kernel@...r.kernel.org>,
        ACPI Devel Maling List <linux-acpi@...r.kernel.org>
Subject: Re: 4.10 ACPI: UBSAN: Undefined behaviour in drivers/acpi/sysfs.c:757:33

+Lv

On Fri, Mar 10, 2017 at 4:53 PM, Meelis Roos <mroos@...ux.ee> wrote:
>> Tried 4.10 on a PC with Ahlon64 X2 CPU and Asun M2N-E maiboard and got
>> this UBSAN warning that was not here with 4.9:
>>
>> [    0.217716] ================================================================================
>> [    0.217950] UBSAN: Undefined behaviour in drivers/acpi/sysfs.c:757:33
>> [    0.218082] shift exponent 64 is too large for 64-bit type 'long long unsigned int'
>> [    0.218316] CPU: 1 PID: 1 Comm: swapper/0 Not tainted 4.10.0 #18
>> [    0.218446] Hardware name: System manufacturer System Product Name/M2N-E, BIOS ASUS M2N-E ACPI BIOS Revision 1703 01/25/2010
>> [    0.218684] Call Trace:
>> [    0.218815]  ? dump_stack+0x47/0x6c
>> [    0.218943]  ? ubsan_epilogue+0x9/0x40
>> [    0.219071]  ? __ubsan_handle_shift_out_of_bounds+0x124/0x160
>> [    0.219203]  ? ktime_get+0x4d/0xf0
>> [    0.219332]  ? wakeup_source_add+0x60/0x100
>> [    0.219462]  ? acpi_gpe_apply_masked_gpes+0x3c/0x7d

So should ACPI_MASKABLE_GPE_MAX be 64?

It looks like that.

>> [    0.219592]  ? acpi_scan_init+0x261/0x287
>> [    0.219721]  ? acpi_init+0x2f3/0x343
>> [    0.219849]  ? acpi_sleep_proc_init+0x22/0x22
>> [    0.219979]  ? do_one_initcall+0x56/0x1f0
>> [    0.220000]  ? kernel_init_freeable+0x245/0x2d2
>> [    0.220000]  ? rest_init+0x70/0x70
>> [    0.220000]  ? kernel_init+0x6/0x110
>> [    0.220000]  ? rest_init+0x70/0x70
>> [    0.220000]  ? ret_from_fork+0x23/0x30
>> [    0.220000]
>> ================================================================================
>
> And the same happens on Sun Ultra 20 Opteron workstation, with a
> slightly different backtrace:
>
> [    0.196897] ================================================================================
> [    0.196927] UBSAN: Undefined behaviour in drivers/acpi/sysfs.c:757:33
> [    0.196946] shift exponent 64 is too large for 64-bit type 'long long unsigned int'
> [    0.196977] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 4.10.0-09686-g9e314890292c #21
> [    0.197004] Hardware name: Sun Microsystems Sun Ultra 20 Workstation/2864, BIOS 2.3.0  05/15/2008
> [    0.197032] Call Trace:
> [    0.197056]  ? dump_stack+0x47/0x65
> [    0.197075]  ? ubsan_epilogue+0x9/0x40
> [    0.197093]  ? __ubsan_handle_shift_out_of_bounds+0xf8/0x140
> [    0.197112]  ? __kmalloc_track_caller+0xb4/0x230
> [    0.197131]  ? ktime_get+0x4d/0xf0
> [    0.197149]  ? wakeup_source_add+0x82/0x110
> [    0.197169]  ? acpi_gpe_apply_masked_gpes+0x3c/0x7d
> [    0.197187]  ? acpi_scan_init+0x261/0x287
> [    0.197204]  ? acpi_init+0x2f3/0x343
> [    0.197222]  ? acpi_sleep_proc_init+0x22/0x22
> [    0.197240]  ? do_one_initcall+0x46/0x1d0
> [    0.197260]  ? kernel_init_freeable+0x245/0x2d2
> [    0.197279]  ? rest_init+0x80/0x80
> [    0.197296]  ? kernel_init+0x6/0x110
> [    0.197313]  ? rest_init+0x80/0x80
> [    0.197330]  ? ret_from_fork+0x23/0x30
> [    0.197346] ================================================================================

This probably is not functionally problematic, but we'll need to fix it.

Thanks,
Rafael