From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753010AbdH1Ixi (ORCPT ); Mon, 28 Aug 2017 04:53:38 -0400 Received: from mail.linuxfoundation.org ([140.211.169.12]:34046 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753105AbdH1ILj (ORCPT ); Mon, 28 Aug 2017 04:11:39 -0400 From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Alexander Potapenko , Xin Long , Marcelo Ricardo Leitner , "David S. Miller" Subject: [PATCH 4.9 13/84] sctp: fully initialize the IPv6 address in sctp_v6_to_addr() Date: Mon, 28 Aug 2017 10:04:38 +0200 Message-Id: <20170828080530.053048990@linuxfoundation.org> X-Mailer: git-send-email 2.14.1 In-Reply-To: <20170828080529.526391781@linuxfoundation.org> References: <20170828080529.526391781@linuxfoundation.org> User-Agent: quilt/0.65 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 4.9-stable review patch. If anyone has any objections, please let me know. ------------------ From: Alexander Potapenko [ Upstream commit 15339e441ec46fbc3bf3486bb1ae4845b0f1bb8d ] 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: Alexander Potapenko Reviewed-by: Xin Long Acked-by: Marcelo Ricardo Leitner Signed-off-by: David S. Miller Signed-off-by: Greg Kroah-Hartman --- net/sctp/ipv6.c | 2 ++ 1 file changed, 2 insertions(+) --- a/net/sctp/ipv6.c +++ b/net/sctp/ipv6.c @@ -512,7 +512,9 @@ static void sctp_v6_to_addr(union sctp_a { addr->sa.sa_family = AF_INET6; addr->v6.sin6_port = port; + addr->v6.sin6_flowinfo = 0; addr->v6.sin6_addr = *saddr; + addr->v6.sin6_scope_id = 0; } /* Compare addresses exactly.