================================================================== BUG: KMSAN: kernel-infoleak in _copy_to_user+0x16b/0x1f0 lib/usercopy.c:32 CPU: 0 PID: 12622 Comm: syz-executor5 Not tainted 4.20.0-rc7+ #6 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+0x173/0x1d0 lib/dump_stack.c:113 kmsan_report+0x12e/0x2a0 mm/kmsan/kmsan.c:600 kmsan_internal_check_memory+0x465/0xb10 mm/kmsan/kmsan.c:663 kmsan_copy_to_user+0xab/0xc0 mm/kmsan/kmsan_hooks.c:601 _copy_to_user+0x16b/0x1f0 lib/usercopy.c:32 copy_to_user include/linux/uaccess.h:177 [inline] sctp_getsockopt_local_addrs net/sctp/socket.c:5981 [inline] sctp_getsockopt+0x164ef/0x17530 net/sctp/socket.c:7460 sock_common_getsockopt+0x13f/0x180 net/core/sock.c:2937 __sys_getsockopt+0x489/0x550 net/socket.c:1939 __do_sys_getsockopt net/socket.c:1950 [inline] __se_sys_getsockopt+0xe1/0x100 net/socket.c:1947 __x64_sys_getsockopt+0x62/0x80 net/socket.c:1947 do_syscall_64+0xbc/0xf0 arch/x86/entry/common.c:291 entry_SYSCALL_64_after_hwframe+0x63/0xe7 RIP: 0033:0x457ec9 Code: 6d b7 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 3b b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007fdf46430c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000037 RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 0000000000457ec9 RDX: 000000000000006d RSI: 0000000000000084 RDI: 0000000000000003 RBP: 000000000073bf00 R08: 0000000020000080 R09: 0000000000000000 R10: 0000000020ad2000 R11: 0000000000000246 R12: 00007fdf464316d4 R13: 00000000004c9068 R14: 00000000004cfc38 R15: 00000000ffffffff Uninit was stored to memory at: kmsan_save_stack_with_flags mm/kmsan/kmsan.c:205 [inline] kmsan_save_stack mm/kmsan/kmsan.c:220 [inline] kmsan_internal_chain_origin+0x134/0x230 mm/kmsan/kmsan.c:426 kmsan_memcpy_memmove_metadata+0xcf2/0xf10 mm/kmsan/kmsan.c:304 kmsan_memcpy_metadata+0xb/0x10 mm/kmsan/kmsan.c:324 __msan_memcpy+0x58/0x70 mm/kmsan/kmsan_instr.c:139 sctp_copy_laddrs net/sctp/socket.c:5884 [inline] sctp_getsockopt_local_addrs net/sctp/socket.c:5950 [inline] sctp_getsockopt+0x16cee/0x17530 net/sctp/socket.c:7460 sock_common_getsockopt+0x13f/0x180 net/core/sock.c:2937 __sys_getsockopt+0x489/0x550 net/socket.c:1939 __do_sys_getsockopt net/socket.c:1950 [inline] __se_sys_getsockopt+0xe1/0x100 net/socket.c:1947 __x64_sys_getsockopt+0x62/0x80 net/socket.c:1947 do_syscall_64+0xbc/0xf0 arch/x86/entry/common.c:291 entry_SYSCALL_64_after_hwframe+0x63/0xe7 Uninit was stored to memory at: kmsan_save_stack_with_flags mm/kmsan/kmsan.c:205 [inline] kmsan_save_stack mm/kmsan/kmsan.c:220 [inline] kmsan_internal_chain_origin+0x134/0x230 mm/kmsan/kmsan.c:426 kmsan_memcpy_memmove_metadata+0xcf2/0xf10 mm/kmsan/kmsan.c:304 kmsan_memcpy_metadata+0xb/0x10 mm/kmsan/kmsan.c:324 __msan_memcpy+0x58/0x70 mm/kmsan/kmsan_instr.c:139 sctp_copy_laddrs net/sctp/socket.c:5873 [inline] sctp_getsockopt_local_addrs net/sctp/socket.c:5950 [inline] sctp_getsockopt+0x16b9a/0x17530 net/sctp/socket.c:7460 sock_common_getsockopt+0x13f/0x180 net/core/sock.c:2937 __sys_getsockopt+0x489/0x550 net/socket.c:1939 __do_sys_getsockopt net/socket.c:1950 [inline] __se_sys_getsockopt+0xe1/0x100 net/socket.c:1947 __x64_sys_getsockopt+0x62/0x80 net/socket.c:1947 do_syscall_64+0xbc/0xf0 arch/x86/entry/common.c:291 entry_SYSCALL_64_after_hwframe+0x63/0xe7 Uninit was created at: kmsan_save_stack_with_flags mm/kmsan/kmsan.c:205 [inline] kmsan_internal_poison_shadow+0x92/0x150 mm/kmsan/kmsan.c:159 kmsan_kmalloc+0xa6/0x130 mm/kmsan/kmsan_hooks.c:176 kmem_cache_alloc_trace+0x55a/0xb90 mm/slub.c:2789 kmalloc include/linux/slab.h:546 [inline] sctp_inet6addr_event+0x5c9/0xc10 net/sctp/ipv6.c:100 notifier_call_chain kernel/notifier.c:93 [inline] __atomic_notifier_call_chain kernel/notifier.c:183 [inline] atomic_notifier_call_chain+0x13d/0x240 kernel/notifier.c:193 inet6addr_notifier_call_chain+0x76/0x90 net/ipv6/addrconf_core.c:107 ipv6_add_addr+0x2361/0x2620 net/ipv6/addrconf.c:1115 inet6_addr_add+0xc75/0x1bd0 net/ipv6/addrconf.c:2912 inet6_rtm_newaddr+0x15be/0x3ab0 net/ipv6/addrconf.c:4757 rtnetlink_rcv_msg+0x115b/0x1550 net/core/rtnetlink.c:4950 netlink_rcv_skb+0x444/0x640 net/netlink/af_netlink.c:2477 rtnetlink_rcv+0x50/0x60 net/core/rtnetlink.c:4968 netlink_unicast_kernel net/netlink/af_netlink.c:1310 [inline] netlink_unicast+0xf40/0x1020 net/netlink/af_netlink.c:1336 netlink_sendmsg+0x127f/0x1300 net/netlink/af_netlink.c:1917 sock_sendmsg_nosec net/socket.c:621 [inline] sock_sendmsg net/socket.c:631 [inline] __sys_sendto+0x8c4/0xac0 net/socket.c:1788 __do_sys_sendto net/socket.c:1800 [inline] __se_sys_sendto+0x107/0x130 net/socket.c:1796 __x64_sys_sendto+0x6e/0x90 net/socket.c:1796 do_syscall_64+0xbc/0xf0 arch/x86/entry/common.c:291 entry_SYSCALL_64_after_hwframe+0x63/0xe7 Bytes 32-35 of 2800 are uninitialized Memory access of size 2800 starts at ffff88801b1f0000 Data copied to user address 0000000020ad2008 ==================================================================