Hi Wysocki and Brown, May I know wether you have checked this? Thanks! On Fri, Dec 22, 2017 at 11:11:10PM +0800, changbin.du@xxxxxxxxx wrote: > From: Changbin Du <changbin.du@xxxxxxxxx> > > The ACPI_MASKABLE_GPE_MAX is larger than the number of bits that u64 can > represent. This result in shift-overflow. So actually we need a bitmap. > > [ 1.003153] ====================================================================== > [ 1.003257] UBSAN: Undefined behaviour in drivers/acpi/sysfs.c:849:33 > [ 1.003314] shift exponent 64 is too large for 64-bit type 'long long unsigned int' > [ 1.003381] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 4.15.0-rc4+ #40 > [ 1.003436] Hardware name: LENOVO 20HAS02515/20HAS02515, BIOS N1VET36W (1.26 ) 10/03/2017 > [ 1.003504] Call Trace: > [ 1.003542] dump_stack+0xe3/0x177 > [ 1.003582] ? _atomic_dec_and_lock+0x219/0x219 > [ 1.003653] ubsan_epilogue+0xd/0x4e > [ 1.003695] __ubsan_handle_shift_out_of_bounds+0x1f8/0x23d > [ 1.003754] ? __ubsan_handle_load_invalid_value+0x13b/0x13b > [ 1.003817] ? trace_hardirqs_on_caller+0x1f3/0x370 > [ 1.003868] ? trace_hardirqs_on+0xd/0x10 > [ 1.003917] ? up+0xe9/0x160 > [ 1.003957] ? sugov_should_update_freq+0xa1/0x1f0 > [ 1.004000] ? trace_hardirqs_on+0xd/0x10 > [ 1.004000] acpi_gpe_apply_masked_gpes+0xa4/0x125 > [ 1.004000] ? acpi_gpe_apply_masked_gpes+0xa4/0x125 > [ 1.004000] ? acpi_gpe_set_masked_gpes+0xe3/0xe3 > [ 1.004000] ? acpi_get_table+0x111/0x127 > [ 1.004000] acpi_scan_init+0x299/0x598 > [ 1.004000] ? acpi_match_madt+0xae/0xae > [ 1.004000] ? sysfs_add_file_mode_ns+0x160/0x320 > [ 1.004000] ? kobject_put+0x23/0x220 > [ 1.004000] ? bus_create_file+0x75/0x90 > [ 1.004000] ? bus_register+0x44a/0x540 > [ 1.004000] ? subsys_register.part.1+0x140/0x140 > [ 1.004000] acpi_init+0x532/0x5d8 > [ 1.004000] ? acpi_sleep_proc_init+0x36/0x36 > [ 1.004000] ? console_trylock+0x60/0x60 > [ 1.004000] ? sysfs_add_file_mode_ns+0x160/0x320 > [ 1.004000] ? sysfs_create_file_ns+0x56/0x80 > [ 1.004000] ? video_setup+0x13c/0x13c > [ 1.004000] ? fb_console_init+0x16c/0x1fc > [ 1.004000] ? acpi_sleep_proc_init+0x36/0x36 > [ 1.004000] do_one_initcall+0xae/0x282 > [ 1.004000] ? initcall_blacklisted+0x1c0/0x1c0 > [ 1.004000] ? up_write+0x92/0x100 > [ 1.004000] ? down_write_nested+0x110/0x110 > [ 1.004000] ? kasan_unpoison_shadow+0x35/0x50 > [ 1.004000] kernel_init_freeable+0x4af/0x573 > [ 1.004000] ? start_kernel+0x6b1/0x6b1 > [ 1.004000] ? rest_init+0x100/0x100 > [ 1.004000] kernel_init+0x13/0x13d > [ 1.004000] ? rest_init+0x100/0x100 > [ 1.004000] ? rest_init+0x100/0x100 > [ 1.004000] ret_from_fork+0x24/0x30 > [ 1.004000] ====================================================================== > > Fixes: 9c4aa1eecb48 ("ACPI / sysfs: Provide quirk mechanism to prevent GPE flooding") > Signed-off-by: Changbin Du <changbin.du@xxxxxxxxx> > --- > drivers/acpi/sysfs.c | 7 ++++--- > 1 file changed, 4 insertions(+), 3 deletions(-) > > diff --git a/drivers/acpi/sysfs.c b/drivers/acpi/sysfs.c > index 06a150b..60ade0b 100644 > --- a/drivers/acpi/sysfs.c > +++ b/drivers/acpi/sysfs.c > @@ -823,7 +823,7 @@ static ssize_t counter_set(struct kobject *kobj, > */ > #define ACPI_MASKABLE_GPE_MAX 0x80 > > -static u64 __initdata acpi_masked_gpes; > +static __initdata DECLARE_BITMAP(acpi_masked_gpes, ACPI_MASKABLE_GPE_MAX); > > static int __init acpi_gpe_set_masked_gpes(char *val) > { > @@ -831,7 +831,8 @@ static int __init acpi_gpe_set_masked_gpes(char *val) > > if (kstrtou8(val, 0, &gpe) || gpe > ACPI_MASKABLE_GPE_MAX) > return -EINVAL; > - acpi_masked_gpes |= ((u64)1<<gpe); > + > + set_bit(gpe, acpi_masked_gpes); > > return 1; > } > @@ -846,7 +847,7 @@ void __init acpi_gpe_apply_masked_gpes(void) > for (gpe = 0; > gpe < min_t(u8, ACPI_MASKABLE_GPE_MAX, acpi_current_gpe_count); > gpe++) { > - if (acpi_masked_gpes & ((u64)1<<gpe)) { > + if (test_bit(gpe, acpi_masked_gpes)) { > status = acpi_get_gpe_device(gpe, &handle); > if (ACPI_SUCCESS(status)) { > pr_info("Masking GPE 0x%x.\n", gpe); > -- > 2.7.4 > -- Thanks, Changbin Du -- To unsubscribe from this list: send the line "unsubscribe linux-acpi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html