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BUG: KMSAN: kernel-infoleak in copy_to_user include/linux/uaccess.h:184 [inline]
BUG: KMSAN: kernel-infoleak in semctl_main+0x12e0/0x58b0 ipc/sem.c:1434
CPU: 1 PID: 18696 Comm: syz-executor5 Not tainted 4.17.0+ #22
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x185/0x1d0 lib/dump_stack.c:113
 kmsan_report+0x188/0x2a0 mm/kmsan/kmsan.c:990
 kmsan_internal_check_memory+0x138/0x1f0 mm/kmsan/kmsan.c:1035
 kmsan_copy_to_user+0x73/0xb0 mm/kmsan/kmsan_hooks.c:479
 copy_to_user include/linux/uaccess.h:184 [inline]
 semctl_main+0x12e0/0x58b0 ipc/sem.c:1434
 ksys_semctl+0x4d5/0x640 ipc/sem.c:1647
 __do_sys_semctl ipc/sem.c:1671 [inline]
 __se_sys_semctl ipc/sem.c:1669 [inline]
 __x64_sys_semctl+0x11e/0x170 ipc/sem.c:1669
 do_syscall_64+0x15b/0x230 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x63/0xe7
RIP: 0033:0x455ba9
RSP: 002b:00007f051307fc68 EFLAGS: 00000246 ORIG_RAX: 0000000000000042
RAX: ffffffffffffffda RBX: 00007f05130806d4 RCX: 0000000000455ba9
RDX: 000000000000000d RSI: 0000000000000000 RDI: 0000000000000000
RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000020000680 R11: 0000000000000246 R12: 0000000000000014
R13: 00000000004c0d2d R14: 00000000004d0db0 R15: 0000000000000000

Uninit was created at:
 kmsan_save_stack_with_flags mm/kmsan/kmsan.c:256 [inline]
 kmsan_internal_alloc_meta_for_pages+0x146/0x700 mm/kmsan/kmsan.c:702
 kmsan_alloc_page+0x75/0xd0 mm/kmsan/kmsan_hooks.c:250
 __alloc_pages_nodemask+0xf7b/0x5cc0 mm/page_alloc.c:4404
 alloc_pages_current+0x6b1/0x970 mm/mempolicy.c:2093
 alloc_pages include/linux/gfp.h:494 [inline]
 __vmalloc_area_node mm/vmalloc.c:1702 [inline]
 __vmalloc_node_range+0x8bf/0x1170 mm/vmalloc.c:1767
 __vmalloc_node mm/vmalloc.c:1812 [inline]
 __vmalloc_node_flags_caller+0x12b/0x140 mm/vmalloc.c:1834
 kvmalloc_node+0x2be/0x2f0 mm/util.c:430
 kvmalloc include/linux/mm.h:550 [inline]
 kvmalloc_array include/linux/mm.h:566 [inline]
 semctl_main+0xcda/0x58b0 ipc/sem.c:1415
 ksys_semctl+0x4d5/0x640 ipc/sem.c:1647
 __do_sys_semctl ipc/sem.c:1671 [inline]
 __se_sys_semctl ipc/sem.c:1669 [inline]
 __x64_sys_semctl+0x11e/0x170 ipc/sem.c:1669
 do_syscall_64+0x15b/0x230 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x63/0xe7

Byte 4096 of 32782 is uninitialized
Memory access starts at ffffc900015a0000
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