• Alexander Potapenko's avatar
    sctp: fully initialize the IPv6 address in sctp_v6_to_addr() · 15339e44
    Alexander Potapenko authored
    KMSAN reported use of uninitialized sctp_addr->v4.sin_addr.s_addr and
    sctp_addr->v6.sin6_scope_id in sctp_v6_cmp_addr() (see below).
    Make sure all fields of an IPv6 address are initialized, which
    guarantees that the IPv4 fields are also initialized.
    
    ==================================================================
     BUG: KMSAN: use of uninitialized memory in sctp_v6_cmp_addr+0x8d4/0x9f0
     net/sctp/ipv6.c:517
     CPU: 2 PID: 31056 Comm: syz-executor1 Not tainted 4.11.0-rc5+ #2944
     Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs
     01/01/2011
     Call Trace:
      dump_stack+0x172/0x1c0 lib/dump_stack.c:42
      is_logbuf_locked mm/kmsan/kmsan.c:59 [inline]
      kmsan_report+0x12a/0x180 mm/kmsan/kmsan.c:938
      native_save_fl arch/x86/include/asm/irqflags.h:18 [inline]
      arch_local_save_flags arch/x86/include/asm/irqflags.h:72 [inline]
      arch_local_irq_save arch/x86/include/asm/irqflags.h:113 [inline]
      __msan_warning_32+0x61/0xb0 mm/kmsan/kmsan_instr.c:467
      sctp_v6_cmp_addr+0x8d4/0x9f0 net/sctp/ipv6.c:517
      sctp_v6_get_dst+0x8c7/0x1630 net/sctp/ipv6.c:290
      sctp_transport_route+0x101/0x570 net/sctp/transport.c:292
      sctp_assoc_add_peer+0x66d/0x16f0 net/sctp/associola.c:651
      sctp_sendmsg+0x35a5/0x4f90 net/sctp/socket.c:1871
      inet_sendmsg+0x498/0x670 net/ipv4/af_inet.c:762
      sock_sendmsg_nosec net/socket.c:633 [inline]
      sock_sendmsg net/socket.c:643 [inline]
      SYSC_sendto+0x608/0x710 net/socket.c:1696
      SyS_sendto+0x8a/0xb0 net/socket.c:1664
      entry_SYSCALL_64_fastpath+0x13/0x94
     RIP: 0033:0x44b479
     RSP: 002b:00007f6213f21c08 EFLAGS: 00000286 ORIG_RAX: 000000000000002c
     RAX: ffffffffffffffda RBX: 0000000020000000 RCX: 000000000044b479
     RDX: 0000000000000041 RSI: 0000000020edd000 RDI: 0000000000000006
     RBP: 00000000007080a8 R08: 0000000020b85fe4 R09: 000000000000001c
     R10: 0000000000040005 R11: 0000000000000286 R12: 00000000ffffffff
     R13: 0000000000003760 R14: 00000000006e5820 R15: 0000000000ff8000
     origin description: ----dst_saddr@sctp_v6_get_dst
     local variable created at:
      sk_fullsock include/net/sock.h:2321 [inline]
      inet6_sk include/linux/ipv6.h:309 [inline]
      sctp_v6_get_dst+0x91/0x1630 net/sctp/ipv6.c:241
      sctp_transport_route+0x101/0x570 net/sctp/transport.c:292
    ==================================================================
     BUG: KMSAN: use of uninitialized memory in sctp_v6_cmp_addr+0x8d4/0x9f0
     net/sctp/ipv6.c:517
     CPU: 2 PID: 31056 Comm: syz-executor1 Not tainted 4.11.0-rc5+ #2944
     Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs
     01/01/2011
     Call Trace:
      dump_stack+0x172/0x1c0 lib/dump_stack.c:42
      is_logbuf_locked mm/kmsan/kmsan.c:59 [inline]
      kmsan_report+0x12a/0x180 mm/kmsan/kmsan.c:938
      native_save_fl arch/x86/include/asm/irqflags.h:18 [inline]
      arch_local_save_flags arch/x86/include/asm/irqflags.h:72 [inline]
      arch_local_irq_save arch/x86/include/asm/irqflags.h:113 [inline]
      __msan_warning_32+0x61/0xb0 mm/kmsan/kmsan_instr.c:467
      sctp_v6_cmp_addr+0x8d4/0x9f0 net/sctp/ipv6.c:517
      sctp_v6_get_dst+0x8c7/0x1630 net/sctp/ipv6.c:290
      sctp_transport_route+0x101/0x570 net/sctp/transport.c:292
      sctp_assoc_add_peer+0x66d/0x16f0 net/sctp/associola.c:651
      sctp_sendmsg+0x35a5/0x4f90 net/sctp/socket.c:1871
      inet_sendmsg+0x498/0x670 net/ipv4/af_inet.c:762
      sock_sendmsg_nosec net/socket.c:633 [inline]
      sock_sendmsg net/socket.c:643 [inline]
      SYSC_sendto+0x608/0x710 net/socket.c:1696
      SyS_sendto+0x8a/0xb0 net/socket.c:1664
      entry_SYSCALL_64_fastpath+0x13/0x94
     RIP: 0033:0x44b479
     RSP: 002b:00007f6213f21c08 EFLAGS: 00000286 ORIG_RAX: 000000000000002c
     RAX: ffffffffffffffda RBX: 0000000020000000 RCX: 000000000044b479
     RDX: 0000000000000041 RSI: 0000000020edd000 RDI: 0000000000000006
     RBP: 00000000007080a8 R08: 0000000020b85fe4 R09: 000000000000001c
     R10: 0000000000040005 R11: 0000000000000286 R12: 00000000ffffffff
     R13: 0000000000003760 R14: 00000000006e5820 R15: 0000000000ff8000
     origin description: ----dst_saddr@sctp_v6_get_dst
     local variable created at:
      sk_fullsock include/net/sock.h:2321 [inline]
      inet6_sk include/linux/ipv6.h:309 [inline]
      sctp_v6_get_dst+0x91/0x1630 net/sctp/ipv6.c:241
      sctp_transport_route+0x101/0x570 net/sctp/transport.c:292
    ==================================================================
    Signed-off-by: default avatarAlexander Potapenko <glider@google.com>
    Reviewed-by: default avatarXin Long <lucien.xin@gmail.com>
    Acked-by: default avatarMarcelo Ricardo Leitner <marcelo.leitner@gmail.com>
    Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
    15339e44
ipv6.c 29.2 KB