Hi all,
Triggered with ubsan:
UBSAN: Undefined behaviour in drivers/acpi/sysfs.c:845:33
shift exponent 64 is too large for 64-bit type 'long long unsigned int'
CPU: 2 PID: 1 Comm: swapper/0 Not tainted 4.14.0-rc5+ #532
Hardware name: LENOVO 80MX/Lenovo E31-80, BIOS DCCN34WW(V2.03) 12/01/2015
Call Trace:
dump_stack+0xab/0xfe
? _atomic_dec_and_lock+0x112/0x112
? get_unsigned_val+0x48/0x91
ubsan_epilogue+0x9/0x49
__ubsan_handle_shift_out_of_bounds+0x1ea/0x241
? __ubsan_handle_load_invalid_value+0x136/0x136
? do_raw_spin_unlock+0xf5/0x1d0
? do_raw_spin_trylock+0x90/0x90
? __lock_is_held+0x71/0x150
? _raw_spin_unlock_irqrestore+0x32/0x50
? trace_hardirqs_on_caller+0x184/0x360
? acpi_gpe_apply_masked_gpes+0x95/0xfd
acpi_gpe_apply_masked_gpes+0x95/0xfd
? acpi_gpe_set_masked_gpes+0xc1/0xc1
? acpi_get_table+0xff/0x114
acpi_scan_init+0x1cf/0x3fe
? acpi_match_madt+0xa7/0xa7
? bus_register+0x386/0x450
? subsys_register.part.1+0x140/0x140
acpi_init+0x41f/0x492
? acpi_sleep_proc_init+0x30/0x30
? console_unlock+0x524/0x7a0
? trace_hardirqs_on_caller+0x184/0x360
? scan_for_dmi_ipmi+0x22/0x202
? fb_console_init+0x14f/0x1e6
? acpi_sleep_proc_init+0x30/0x30
do_one_initcall+0xa3/0x256
? parameq+0xe0/0xe0
? initcall_blacklisted+0x160/0x160
? down_write_nested+0x110/0x110
? kasan_unpoison_shadow+0x30/0x40
kernel_init_freeable+0x3ee/0x47f
? rest_init+0xf0/0xf0
kernel_init+0xf/0x140
? rest_init+0xf0/0xf0
ret_from_fork+0x27/0x40
Code is:
#define ACPI_MASKABLE_GPE_MAX 0x80
...
void __init acpi_gpe_apply_masked_gpes(void)
{
acpi_handle handle;
acpi_status status;
u8 gpe;
for (gpe = 0;
gpe < min_t(u8, ACPI_MASKABLE_GPE_MAX, acpi_current_gpe_count);
gpe++) {
if (acpi_masked_gpes & ((u64)1<<gpe)) {
...
Left shift on the last line is bound by ACPI_MASKABLE_GPE_MAX which is 0x80.
Regards,
Tvrtko
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