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BUG: KMSAN: kernel-infoleak in kmsan_copy_to_user+0x9c/0xb0 mm/kmsan/kmsan_hooks.c:252
CPU: 0 PID: 25125 Comm: syz-executor.3 Not tainted 5.13.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:79 [inline]
 dump_stack+0x24c/0x2e0 lib/dump_stack.c:120
 kmsan_report+0xfb/0x1e0 mm/kmsan/kmsan_report.c:121
 kmsan_internal_check_memory+0x29c/0x500 mm/kmsan/kmsan.c:420
 kmsan_copy_to_user+0x9c/0xb0 mm/kmsan/kmsan_hooks.c:252
 instrument_copy_to_user include/linux/instrumented.h:126 [inline]
 copyout lib/iov_iter.c:189 [inline]
 _copy_to_iter+0x6b2/0x3da0 lib/iov_iter.c:661
 copy_to_iter include/linux/uio.h:145 [inline]
 simple_copy_to_iter+0xf6/0x150 net/core/datagram.c:519
 __skb_datagram_iter+0x2cb/0x1210 net/core/datagram.c:425
 skb_copy_datagram_iter+0xd8/0x200 net/core/datagram.c:533
 skb_copy_datagram_msg include/linux/skbuff.h:3602 [inline]
 netlink_recvmsg+0x772/0x1bc0 net/netlink/af_netlink.c:1987
 sock_recvmsg_nosec net/socket.c:888 [inline]
 sock_recvmsg net/socket.c:906 [inline]
 __sys_recvfrom+0x6a2/0x9f0 net/socket.c:2021
 __do_sys_recvfrom net/socket.c:2039 [inline]
 __se_sys_recvfrom net/socket.c:2035 [inline]
 __x64_sys_recvfrom+0x19d/0x210 net/socket.c:2035
 do_syscall_64+0xb3/0x180 arch/x86/entry/common.c:53
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x4665e9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f81b97ae188 EFLAGS: 00000246 ORIG_RAX: 000000000000002d
RAX: ffffffffffffffda RBX: 000000000056bf80 RCX: 00000000004665e9
RDX: fffffffffffffd1b RSI: 0000000020000000 RDI: 0000000000000003
RBP: 00000000004bfcc4 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf80
R13: 0000000000a9fb1f R14: 00007f81b97ae300 R15: 0000000000022000

Uninit was stored to memory at:
 kmsan_save_stack_with_flags mm/kmsan/kmsan.c:120 [inline]
 kmsan_internal_chain_origin+0xad/0x130 mm/kmsan/kmsan.c:288
 kmsan_memcpy_memmove_metadata+0x25e/0x2d0 mm/kmsan/kmsan.c:225
 kmsan_memcpy_metadata+0xb/0x10 mm/kmsan/kmsan.c:245
 __msan_memcpy+0x46/0x60 mm/kmsan/kmsan_instr.c:110
 __nla_put lib/nlattr.c:994 [inline]
 nla_put+0x2eb/0x3c0 lib/nlattr.c:1052
 nla_put_u32 include/net/netlink.h:1311 [inline]
 vti6_fill_info+0x5ad/0x670 net/ipv6/ip6_vti.c:1086
 rtnl_link_info_fill net/core/rtnetlink.c:670 [inline]
 rtnl_link_fill net/core/rtnetlink.c:691 [inline]
 rtnl_fill_ifinfo+0x5a30/0x7d20 net/core/rtnetlink.c:1796
 rtnl_dump_ifinfo+0x1c8c/0x27d0 net/core/rtnetlink.c:2129
 netlink_dump+0xb92/0x1650 net/netlink/af_netlink.c:2278
 netlink_recvmsg+0x1046/0x1bc0 net/netlink/af_netlink.c:2012
 sock_recvmsg_nosec net/socket.c:888 [inline]
 sock_recvmsg net/socket.c:906 [inline]
 __sys_recvfrom+0x6a2/0x9f0 net/socket.c:2021
 __do_sys_recvfrom net/socket.c:2039 [inline]
 __se_sys_recvfrom net/socket.c:2035 [inline]
 __x64_sys_recvfrom+0x19d/0x210 net/socket.c:2035
 do_syscall_64+0xb3/0x180 arch/x86/entry/common.c:53
 entry_SYSCALL_64_after_hwframe+0x44/0xae

Uninit was stored to memory at:
 kmsan_save_stack_with_flags mm/kmsan/kmsan.c:120 [inline]
 kmsan_internal_chain_origin+0xad/0x130 mm/kmsan/kmsan.c:288
 __msan_chain_origin+0x54/0xa0 mm/kmsan/kmsan_instr.c:147
 nla_put_u32 include/net/netlink.h:1309 [inline]
 vti6_fill_info+0x60e/0x670 net/ipv6/ip6_vti.c:1086
 rtnl_link_info_fill net/core/rtnetlink.c:670 [inline]
 rtnl_link_fill net/core/rtnetlink.c:691 [inline]
 rtnl_fill_ifinfo+0x5a30/0x7d20 net/core/rtnetlink.c:1796
 rtnl_dump_ifinfo+0x1c8c/0x27d0 net/core/rtnetlink.c:2129
 netlink_dump+0xb92/0x1650 net/netlink/af_netlink.c:2278
 netlink_recvmsg+0x1046/0x1bc0 net/netlink/af_netlink.c:2012
 sock_recvmsg_nosec net/socket.c:888 [inline]
 sock_recvmsg net/socket.c:906 [inline]
 __sys_recvfrom+0x6a2/0x9f0 net/socket.c:2021
 __do_sys_recvfrom net/socket.c:2039 [inline]
 __se_sys_recvfrom net/socket.c:2035 [inline]
 __x64_sys_recvfrom+0x19d/0x210 net/socket.c:2035
 do_syscall_64+0xb3/0x180 arch/x86/entry/common.c:53
 entry_SYSCALL_64_after_hwframe+0x44/0xae

Uninit was stored to memory at:
 kmsan_save_stack_with_flags mm/kmsan/kmsan.c:120 [inline]
 kmsan_internal_chain_origin+0xad/0x130 mm/kmsan/kmsan.c:288
 kmsan_memcpy_memmove_metadata+0x25e/0x2d0 mm/kmsan/kmsan.c:225
 kmsan_memcpy_metadata+0xb/0x10 mm/kmsan/kmsan.c:245
 __msan_memcpy+0x46/0x60 mm/kmsan/kmsan_instr.c:110
 vti6_tnl_create net/ipv6/ip6_vti.c:226 [inline]
 vti6_locate net/ipv6/ip6_vti.c:277 [inline]
 vti6_ioctl+0x2816/0x3980 net/ipv6/ip6_vti.c:840
 dev_do_ioctl net/core/dev_ioctl.c:230 [inline]
 dev_ifsioc+0x12ed/0x1560 net/core/dev_ioctl.c:336
 dev_ioctl+0xb6e/0x1260 net/core/dev_ioctl.c:530
 sock_ioctl+0xd41/0xef0 net/socket.c:1091
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:1069 [inline]
 __se_sys_ioctl+0x311/0x4d0 fs/ioctl.c:1055
 __x64_sys_ioctl+0xd8/0x110 fs/ioctl.c:1055
 do_syscall_64+0xb3/0x180 arch/x86/entry/common.c:53
 entry_SYSCALL_64_after_hwframe+0x44/0xae

Local variable ----p1@vti6_ioctl created at:
 vti6_ioctl+0xb5/0x3980 net/ipv6/ip6_vti.c:805
 vti6_ioctl+0xb5/0x3980 net/ipv6/ip6_vti.c:805

Byte 10280 of 11080 is uninitialized
Memory access of size 11080 starts at ffff888167bb4ec7
Data copied to user address 0000000020000000
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