Dear Linux folks, On 12/13/17 14:13, Paul Menzel wrote:
I enabled the undefined behavior sanitizer, and built Linus’ master branch under Ubuntu 17.10 with gcc (Ubuntu 7.2.0-8ubuntu3) 7.2.0.``` $ grep UBSAN /boot/config-4.15.0-rc3+ CONFIG_ARCH_HAS_UBSAN_SANITIZE_ALL=y # CONFIG_ARCH_WANTS_UBSAN_NO_NULL is not set CONFIG_UBSAN=y CONFIG_UBSAN_SANITIZE_ALL=y # CONFIG_UBSAN_ALIGNMENT is not set CONFIG_UBSAN_NULL=y ``` Starting the system the messages below are printed. ```[ 0.758899] ================================================================================[ 0.758960] UBSAN: Undefined behaviour in drivers/acpi/sysfs.c:849:33 [ 0.759008] shift exponent 64 is too large for 64-bit type 'long long unsigned int' [ 0.759064] CPU: 2 PID: 1 Comm: swapper/0 Not tainted 4.15.0-rc3+ #12 [ 0.759076] Hardware name: Notebook N24_25BU/N24_25BU, BIOS 5.12 07/07/2017 [ 0.759088] Call Trace: [ 0.759118] ? ftrace_graph_caller+0x98/0x98 [ 0.759133] dump_stack+0x70/0xae [ 0.759167] ubsan_epilogue+0x9/0x40 [ 0.759188] __ubsan_handle_shift_out_of_bounds+0x12b/0x170 [ 0.759214] ? ftrace_graph_caller+0x68/0x98 [ 0.759293] ? acpi_gpe_apply_masked_gpes+0x50/0xa9 [ 0.759314] acpi_gpe_apply_masked_gpes+0x50/0xa9 [ 0.759348] ? ftrace_graph_caller+0x98/0x98 [ 0.759363] acpi_scan_init+0x145/0x2e4 [ 0.759385] ? acpi_sleep_proc_init+0x24/0x24 [ 0.759413] ? acpi_sleep_proc_init+0x24/0x24 [ 0.759429] ? ftrace_graph_caller+0x98/0x98 [ 0.759444] acpi_init+0x340/0x3a0 [ 0.759500] ? ftrace_graph_caller+0x98/0x98 [ 0.759515] do_one_initcall+0x173/0x200 [ 0.759553] ? acpi_sleep_proc_init+0x24/0x24 [ 0.759573] ? do_one_initcall+0x5/0x200 [ 0.759612] ? ftrace_graph_caller+0x98/0x98 [ 0.759628] kernel_init_freeable+0x305/0x395 [ 0.759653] ? rest_init+0xd0/0xd0 [ 0.759689] kernel_init+0xb/0x119 [ 0.759705] ? rest_init+0xd0/0xd0 [ 0.759721] ret_from_fork+0x1f/0x30[ 0.759815] ================================================================================``` Please tell me, if you need anything else to address this.
I created bug #198481 [1], so this is not forgotten about. Kind regards, Paul [1] https://bugzilla.kernel.org/show_bug.cgi?id=198481
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