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BUG: KMSAN: kernel-infoleak in copyout+0x16b/0x1f0 lib/iov_iter.c:145
CPU: 0 PID: 12265 Comm: syz-execprog Not tainted 5.3.0-rc7+ #0
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+0x191/0x1f0 lib/dump_stack.c:113
 kmsan_report+0x162/0x2d0 mm/kmsan/kmsan_report.c:109
 kmsan_internal_check_memory+0x7be/0x8d0 mm/kmsan/kmsan.c:553
 kmsan_copy_to_user+0xa9/0xb0 mm/kmsan/kmsan_hooks.c:493
 copyout+0x16b/0x1f0 lib/iov_iter.c:145
 copy_page_to_iter_iovec lib/iov_iter.c:217 [inline]
 copy_page_to_iter+0x6dc/0x1940 lib/iov_iter.c:906
 pipe_read+0x4b4/0x12d0 fs/pipe.c:306
 call_read_iter include/linux/fs.h:1864 [inline]
 new_sync_read fs/read_write.c:414 [inline]
 __vfs_read+0xa67/0xc90 fs/read_write.c:427
 vfs_read+0x359/0x6f0 fs/read_write.c:461
 ksys_read+0x265/0x430 fs/read_write.c:587
 __do_sys_read fs/read_write.c:597 [inline]
 __se_sys_read+0x92/0xb0 fs/read_write.c:595
 __x64_sys_read+0x4a/0x70 fs/read_write.c:595
 do_syscall_64+0xbc/0xf0 arch/x86/entry/common.c:297
 entry_SYSCALL_64_after_hwframe+0x63/0xe7
RIP: 0033:0x482944
Code: ff ff cc cc cc cc e8 0b f9 fa ff 48 8b 7c 24 10 48 8b 74 24 18 48 8b 54 24 20 45 31 d2 45 31 c0 45 31 c9 48 8b 44 24 08 0f 05 <48> 3d 01 f0 ff ff 76 20 48 c7 44 24 28 ff ff ff ff 48 c7 44 24 30
RSP: 002b:000000c420026d88 EFLAGS: 00000246 ORIG_RAX: 0000000000000000
RAX: ffffffffffffffda RBX: 000000c420028a80 RCX: 0000000000482944
RDX: 0000000000020000 RSI: 000000c4203ac000 RDI: 0000000000000006
RBP: 000000c420026dd8 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
R13: 000000c4203840c0 R14: 0000000000000001 R15: 0000000000000000

Uninit was created at:
 kmsan_save_stack_with_flags+0x37/0x70 mm/kmsan/kmsan.c:189
 kmsan_internal_alloc_meta_for_pages+0x123/0x510 mm/kmsan/kmsan_hooks.c:114
 kmsan_alloc_page+0x7a/0xf0 mm/kmsan/kmsan_hooks.c:244
 __alloc_pages_nodemask+0x142d/0x5fa0 mm/page_alloc.c:4757
 alloc_pages_current+0x68d/0x9a0 mm/mempolicy.c:2153
 alloc_pages include/linux/gfp.h:511 [inline]
 push_pipe+0x660/0xbd0 lib/iov_iter.c:528
 __pipe_get_pages lib/iov_iter.c:1244 [inline]
 pipe_get_pages_alloc lib/iov_iter.c:1353 [inline]
 iov_iter_get_pages_alloc+0x1879/0x1e40 lib/iov_iter.c:1371
 default_file_splice_read+0x294/0x1060 fs/splice.c:388
 do_splice_to fs/splice.c:877 [inline]
 do_splice fs/splice.c:1184 [inline]
 __do_sys_splice fs/splice.c:1425 [inline]
 __se_sys_splice+0x2ec1/0x3320 fs/splice.c:1405
 __x64_sys_splice+0x6e/0x90 fs/splice.c:1405
 do_syscall_64+0xbc/0xf0 arch/x86/entry/common.c:297
 entry_SYSCALL_64_after_hwframe+0x63/0xe7

Bytes 0-7 of 8 are uninitialized
Memory access of size 8 starts at ffff8880a9b0a000
Data copied to user address 000000c4203ac000
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