syzbot

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BUG: KMSAN: kernel-infoleak in _copy_to_user+0x15d/0x1f0 lib/usercopy.c:31
CPU: 1 PID: 6730 Comm: syz-executor2 Not tainted 4.19.0-rc4+ #57
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+0x2f6/0x430 lib/dump_stack.c:113
 kmsan_report+0x183/0x2b0 mm/kmsan/kmsan.c:956
 kmsan_internal_check_memory+0x138/0x1f0 mm/kmsan/kmsan.c:1001
 kmsan_copy_to_user+0x79/0xc0 mm/kmsan/kmsan_hooks.c:482
 _copy_to_user+0x15d/0x1f0 lib/usercopy.c:31
 copy_to_user include/linux/uaccess.h:183 [inline]
 semctl_main+0x2e07/0x57a0 ipc/sem.c:1455
 ksys_semctl+0x4d1/0x630 ipc/sem.c:1670
 __do_sys_semctl ipc/sem.c:1694 [inline]
 __se_sys_semctl+0xb8/0xd0 ipc/sem.c:1692
 __x64_sys_semctl+0x56/0x70 ipc/sem.c:1692
 do_syscall_64+0xb8/0x100 arch/x86/entry/common.c:291
 entry_SYSCALL_64_after_hwframe+0x63/0xe7
RIP: 0033:0x457579
Code: 1d b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 eb b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f1cb3661c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000042
RAX: ffffffffffffffda RBX: 00007f1cb3661c90 RCX: 0000000000457579
RDX: 000000000000000d RSI: 0000000000000000 RDI: 0000000000000000
RBP: 000000000072bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000020000000 R11: 0000000000000246 R12: 00007f1cb36626d4
R13: 00000000004c3362 R14: 00000000004d4fd0 R15: 0000000000000003

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:694
 kmsan_alloc_page+0x75/0xd0 mm/kmsan/kmsan_hooks.c:250
 __alloc_pages_nodemask+0x11ef/0x6370 mm/page_alloc.c:4410
 alloc_pages_current+0x51f/0x760 mm/mempolicy.c:2093
 alloc_pages include/linux/gfp.h:511 [inline]
 __vmalloc_area_node mm/vmalloc.c:1689 [inline]
 __vmalloc_node_range+0x8c6/0x1140 mm/vmalloc.c:1754
 __vmalloc_node mm/vmalloc.c:1799 [inline]
 __vmalloc_node_flags_caller+0x12b/0x140 mm/vmalloc.c:1821
 kvmalloc_node+0x3a1/0x3e0 mm/util.c:432
 kvmalloc include/linux/mm.h:577 [inline]
 kvmalloc_array include/linux/mm.h:595 [inline]
 semctl_main+0x503b/0x57a0 ipc/sem.c:1436
 ksys_semctl+0x4d1/0x630 ipc/sem.c:1670
 __do_sys_semctl ipc/sem.c:1694 [inline]
 __se_sys_semctl+0xb8/0xd0 ipc/sem.c:1692
 __x64_sys_semctl+0x56/0x70 ipc/sem.c:1692
 do_syscall_64+0xb8/0x100 arch/x86/entry/common.c:291
 entry_SYSCALL_64_after_hwframe+0x63/0xe7

Bytes 4096-8192 of 16398 are uninitialized
Memory access starts at ffffc9000dc8f000
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