===================================================== BUG: KMSAN: kernel-infoleak in kmsan_copy_to_user+0x9c/0xb0 mm/kmsan/kmsan_hooks.c:251 CPU: 0 PID: 17431 Comm: syz-executor.0 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+0x1f5/0x500 mm/kmsan/kmsan.c:399 kmsan_copy_to_user+0x9c/0xb0 mm/kmsan/kmsan_hooks.c:251 instrument_copy_to_user include/linux/instrumented.h:121 [inline] copyout lib/iov_iter.c:189 [inline] _copy_to_iter+0x2a2d/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 ____sys_recvmsg+0x57f/0xd50 net/socket.c:888 ___sys_recvmsg net/socket.c:2598 [inline] do_recvmmsg+0xa97/0x22d0 net/socket.c:2692 __sys_recvmmsg net/socket.c:2773 [inline] __do_sys_recvmmsg net/socket.c:2794 [inline] __se_sys_recvmmsg+0x2dc/0x410 net/socket.c:2787 __x64_sys_recvmmsg+0x62/0x80 net/socket.c:2787 do_syscall_64+0xb3/0x180 arch/x86/entry/common.c:49 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x4665d9 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:00007f0dda70e188 EFLAGS: 00000246 ORIG_RAX: 000000000000012b RAX: ffffffffffffffda RBX: 000000000056bf80 RCX: 00000000004665d9 RDX: 0800000000000197 RSI: 00000000200037c0 RDI: 0000000000000003 RBP: 00000000004bfcb9 R08: 0000000020003700 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf80 R13: 0000000000a9fb1f R14: 00007f0dda70e300 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 ____sys_recvmsg+0x57f/0xd50 net/socket.c:888 ___sys_recvmsg net/socket.c:2598 [inline] do_recvmmsg+0xa97/0x22d0 net/socket.c:2692 __sys_recvmmsg net/socket.c:2773 [inline] __do_sys_recvmmsg net/socket.c:2794 [inline] __se_sys_recvmmsg+0x2dc/0x410 net/socket.c:2787 __x64_sys_recvmmsg+0x62/0x80 net/socket.c:2787 do_syscall_64+0xb3/0x180 arch/x86/entry/common.c:49 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 ____sys_recvmsg+0x57f/0xd50 net/socket.c:888 ___sys_recvmsg net/socket.c:2598 [inline] do_recvmmsg+0xa97/0x22d0 net/socket.c:2692 __sys_recvmmsg net/socket.c:2773 [inline] __do_sys_recvmmsg net/socket.c:2794 [inline] __se_sys_recvmmsg+0x2dc/0x410 net/socket.c:2787 __x64_sys_recvmmsg+0x62/0x80 net/socket.c:2787 do_syscall_64+0xb3/0x180 arch/x86/entry/common.c:49 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+0x4a/0x70 fs/ioctl.c:1055 do_syscall_64+0xb3/0x180 arch/x86/entry/common.c:49 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 Bytes 941-944 of 3141 are uninitialized Memory access of size 3141 starts at ffff88812a3450af =====================================================