================================================================== BUG: KMSAN: kernel-infoleak in _copy_to_user+0x16b/0x1f0 lib/usercopy.c:32 CPU: 1 PID: 10527 Comm: syz-executor.2 Not tainted 5.0.0-rc1+ #9 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 sctp_getsockopt+0x2530/0x17f70 include/linux/uaccess.h:174 sock_common_getsockopt+0x13f/0x180 net/core/sock.c:2950 __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: 0033:0x457e29 Code: ad b8 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 7b b8 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f4aaab5ec78 EFLAGS: 00000246 ORIG_RAX: 0000000000000037 RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 0000000000457e29 RDX: 0000000000000070 RSI: 0000000000000084 RDI: 0000000000000005 RBP: 000000000073c180 R08: 0000000020000300 R09: 0000000000000000 R10: 0000000020000200 R11: 0000000000000246 R12: 00007f4aaab5f6d4 R13: 00000000004c9a88 R14: 00000000004d02f8 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_getsockopt_assoc_stats net/sctp/socket.c:6984 [inline] sctp_getsockopt+0xbcb9/0x17f70 net/sctp/socket.c:7653 sock_common_getsockopt+0x13f/0x180 net/core/sock.c:2950 __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_max_rto include/net/sctp/sctp.h:280 [inline] sctp_do_8_2_transport_strike+0x9c8/0xab0 net/sctp/sm_sideeffect.c:596 sctp_cmd_interpreter net/sctp/sm_sideeffect.c:1669 [inline] sctp_side_effects net/sctp/sm_sideeffect.c:1220 [inline] sctp_do_sm+0x1c1b/0x9af0 net/sctp/sm_sideeffect.c:1191 sctp_primitive_REQUESTHEARTBEAT+0x175/0x1a0 net/sctp/primitive.c:200 sctp_apply_peer_addr_params+0x210/0x1d60 net/sctp/socket.c:2529 sctp_setsockopt_peer_addr_params net/sctp/socket.c:2781 [inline] sctp_setsockopt+0x12e42/0x13560 net/sctp/socket.c:4405 sock_common_setsockopt+0x13b/0x170 net/core/sock.c:2991 __sys_setsockopt+0x493/0x540 net/socket.c:1902 __do_sys_setsockopt net/socket.c:1913 [inline] __se_sys_setsockopt+0xdd/0x100 net/socket.c:1910 __x64_sys_setsockopt+0x62/0x80 net/socket.c:1910 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_transport_init net/sctp/transport.c:61 [inline] sctp_transport_new+0x16d/0x9a0 net/sctp/transport.c:115 sctp_assoc_add_peer+0x532/0x1f70 net/sctp/associola.c:637 sctp_process_param net/sctp/sm_make_chunk.c:2543 [inline] sctp_process_init+0x1a1b/0x3ed0 net/sctp/sm_make_chunk.c:2356 sctp_sf_do_5_1D_ce+0xe22/0x3080 net/sctp/sm_statefuns.c:782 sctp_do_sm+0x2c8/0x9af0 net/sctp/sm_sideeffect.c:1188 sctp_endpoint_bh_rcv+0xd5b/0x1000 net/sctp/endpointola.c:456 sctp_inq_push+0x300/0x420 net/sctp/inqueue.c:95 sctp_rcv+0x3c2f/0x54f0 net/sctp/input.c:271 sctp6_rcv+0x41/0x70 net/sctp/ipv6.c:1065 ip6_protocol_deliver_rcu+0xb5a/0x23a0 net/ipv6/ip6_input.c:394 ip6_input_finish net/ipv6/ip6_input.c:434 [inline] NF_HOOK include/linux/netfilter.h:289 [inline] ip6_input+0x2b6/0x350 net/ipv6/ip6_input.c:443 dst_input include/net/dst.h:450 [inline] ip6_rcv_finish+0x4e7/0x6d0 net/ipv6/ip6_input.c:76 NF_HOOK include/linux/netfilter.h:289 [inline] ipv6_rcv+0x34b/0x3f0 net/ipv6/ip6_input.c:272 __netif_receive_skb_one_core net/core/dev.c:4973 [inline] __netif_receive_skb net/core/dev.c:5083 [inline] process_backlog+0x756/0x10e0 net/core/dev.c:5923 napi_poll net/core/dev.c:6346 [inline] net_rx_action+0x78b/0x1a60 net/core/dev.c:6412 __do_softirq+0x53f/0x93a kernel/softirq.c:293 Local variable description: ----addr.i@sctp_process_init Variable was created at: sctp_process_init+0xb5/0x3ed0 net/sctp/sm_make_chunk.c:2319 sctp_sf_do_5_1D_ce+0xe22/0x3080 net/sctp/sm_statefuns.c:782 Bytes 16-23 of 256 are uninitialized Memory access of size 256 starts at ffff88804dfbfc28 Data copied to user address 0000000020000200 ==================================================================