RDX: 000000000000006f RSI: 00000000200000c0 RDI: 0000000000000003
RBP: 000000000072bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000001622914
R13: 00000000004c292a R14: 00000000004d5c18 R15: 0000000000000004
==================================================================
BUG: KMSAN: kernel-infoleak in copyout+0x1a4/0x250 lib/iov_iter.c:143
CPU: 0 PID: 7249 Comm: syz-executor0 Not tainted 4.20.0-rc5+ #109
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+0x32d/0x480 lib/dump_stack.c:113
 kmsan_report+0x12d/0x290 mm/kmsan/kmsan.c:683
 kmsan_internal_check_memory+0x9ce/0xa50 mm/kmsan/kmsan.c:769
 kmsan_copy_to_user+0x8d/0xa0 mm/kmsan/kmsan_hooks.c:620
 copyout+0x1a4/0x250 lib/iov_iter.c:143
 copy_page_to_iter_iovec lib/iov_iter.c:215 [inline]
 copy_page_to_iter+0x6d9/0x19b0 lib/iov_iter.c:885
 generic_file_buffered_read mm/filemap.c:2113 [inline]
 generic_file_read_iter+0x36a8/0x4fc0 mm/filemap.c:2290
 blkdev_read_iter+0x20d/0x270 fs/block_dev.c:1936
 call_read_iter include/linux/fs.h:1851 [inline]
 new_sync_read fs/read_write.c:406 [inline]
 __vfs_read+0x874/0xb00 fs/read_write.c:418
 vfs_read+0x3b3/0x6f0 fs/read_write.c:452
 ksys_read fs/read_write.c:578 [inline]
 __do_sys_read fs/read_write.c:588 [inline]
 __se_sys_read+0x17a/0x370 fs/read_write.c:586
 __x64_sys_read+0x4a/0x70 fs/read_write.c:586
 do_syscall_64+0xcd/0x110 arch/x86/entry/common.c:291
 entry_SYSCALL_64_after_hwframe+0x63/0xe7
RIP: 0033:0x457569
Code: fd b3 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 cb b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007ffcd211f988 EFLAGS: 00000246 ORIG_RAX: 0000000000000000
RAX: ffffffffffffffda RBX: 00007ffcd211f9a0 RCX: 0000000000457569
RDX: 000000000000006f RSI: 00000000200000c0 RDI: 0000000000000003
RBP: 000000000072bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000001622914
R13: 00000000004c292a R14: 00000000004d5c18 R15: 0000000000000004

Uninit was created at:
 kmsan_save_stack_with_flags+0x7a/0x130 mm/kmsan/kmsan.c:246
 kmsan_internal_alloc_meta_for_pages+0x113/0x640 mm/kmsan/kmsan_hooks.c:102
 kmsan_alloc_page+0x77/0xc0 mm/kmsan/kmsan_hooks.c:402
 __alloc_pages_nodemask+0x171b/0x63b0 mm/page_alloc.c:4416
 alloc_pages_current+0x566/0x820 mm/mempolicy.c:2080
 alloc_pages include/linux/gfp.h:511 [inline]
 __page_cache_alloc+0xdb/0x4a0 mm/filemap.c:925
 page_cache_alloc include/linux/pagemap.h:234 [inline]
 generic_file_buffered_read mm/filemap.c:2201 [inline]
 generic_file_read_iter+0x2749/0x4fc0 mm/filemap.c:2290
 blkdev_read_iter+0x20d/0x270 fs/block_dev.c:1936
 call_read_iter include/linux/fs.h:1851 [inline]
 new_sync_read fs/read_write.c:406 [inline]
 __vfs_read+0x874/0xb00 fs/read_write.c:418
 vfs_read+0x3b3/0x6f0 fs/read_write.c:452
 ksys_read fs/read_write.c:578 [inline]
 __do_sys_read fs/read_write.c:588 [inline]
 __se_sys_read+0x17a/0x370 fs/read_write.c:586
 __x64_sys_read+0x4a/0x70 fs/read_write.c:586
 do_syscall_64+0xcd/0x110 arch/x86/entry/common.c:291
 entry_SYSCALL_64_after_hwframe+0x63/0xe7

Bytes 0-110 of 111 are uninitialized
Memory access of size 111 starts at ffff8881989f8000
Data copied to user address 00000000200000c0
==================================================================