Patch "ipv6: sit: better validate user provided tunnel names" has been added to the 4.9-stable tree

This is a note to let you know that I've just added the patch titled

ipv6: sit: better validate user provided tunnel names

to the 4.9-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
ipv6-sit-better-validate-user-provided-tunnel-names.patch
and it can be found in the queue-4.9 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: Eric Dumazet <[email protected]>
Date: Thu, 5 Apr 2018 06:39:28 -0700
Subject: ipv6: sit: better validate user provided tunnel names

From: Eric Dumazet <[email protected]>

[ Upstream commit b95211e066fc3494b7c115060b2297b4ba21f025 ]

Use dev_valid_name() to make sure user does not provide illegal device name.

syzbot caught the following bug :

BUG: KASAN: stack-out-of-bounds in strlcpy include/linux/string.h:300 [inline]
BUG: KASAN: stack-out-of-bounds in ipip6_tunnel_locate+0x63b/0xaa0 net/ipv6/sit.c:254
Write of size 33 at addr ffff8801b64076d8 by task syzkaller932654/4453

CPU: 0 PID: 4453 Comm: syzkaller932654 Not tainted 4.16.0+ #1
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:17 [inline]
 dump_stack+0x1b9/0x29f lib/dump_stack.c:53
 print_address_description+0x6c/0x20b mm/kasan/report.c:256
 kasan_report_error mm/kasan/report.c:354 [inline]
 kasan_report.cold.7+0xac/0x2f5 mm/kasan/report.c:412
 check_memory_region_inline mm/kasan/kasan.c:260 [inline]
 check_memory_region+0x13e/0x1b0 mm/kasan/kasan.c:267
 memcpy+0x37/0x50 mm/kasan/kasan.c:303
 strlcpy include/linux/string.h:300 [inline]
 ipip6_tunnel_locate+0x63b/0xaa0 net/ipv6/sit.c:254
 ipip6_tunnel_ioctl+0xe71/0x241b net/ipv6/sit.c:1221
 dev_ifsioc+0x43e/0xb90 net/core/dev_ioctl.c:334
 dev_ioctl+0x69a/0xcc0 net/core/dev_ioctl.c:525
 sock_ioctl+0x47e/0x680 net/socket.c:1015
 vfs_ioctl fs/ioctl.c:46 [inline]
 file_ioctl fs/ioctl.c:500 [inline]
 do_vfs_ioctl+0x1cf/0x1650 fs/ioctl.c:684
 ksys_ioctl+0xa9/0xd0 fs/ioctl.c:701
 SYSC_ioctl fs/ioctl.c:708 [inline]
 SyS_ioctl+0x24/0x30 fs/ioctl.c:706
 do_syscall_64+0x29e/0x9d0 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x42/0xb7

---
 net/ipv6/sit.c |    8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

@@ -244,11 +244,13 @@ static struct ip_tunnel *ipip6_tunnel_lo
 	if (!create)
 		goto failed;
 
-	if (parms->name[0])
+	if (parms->name[0]) {
+		if (!dev_valid_name(parms->name))
+			goto failed;
 		strlcpy(name, parms->name, IFNAMSIZ);
-	else
+	} else {
 		strcpy(name, "sit%d");
-
+	}
 	dev = alloc_netdev(sizeof(*t), name, NET_NAME_UNKNOWN,
 			   ipip6_tunnel_setup);
 	if (!dev)

Patches currently in stable-queue which might be from [email protected] are

queue-4.9/tcp-better-validation-of-received-ack-sequences.patch queue-4.9/sctp-sctp_sockaddr_af-must-check-minimal-addr-length-for-af_inet6.patch queue-4.9/net-fix-possible-out-of-bound-read-in-skb_network_protocol.patch queue-4.9/pptp-remove-a-buggy-dst-release-in-pptp_connect.patch queue-4.9/x86-asm-don-t-use-rbp-as-a-temporary-register-in-csum_partial_copy_generic.patch queue-4.9/net-fool-proof-dev_valid_name.patch queue-4.9/ipv6-the-entire-ipv6-header-chain-must-fit-the-first-fragment.patch queue-4.9/vti6-better-validate-user-provided-tunnel-names.patch queue-4.9/ipv6-sit-better-validate-user-provided-tunnel-names.patch queue-4.9/ip6_tunnel-better-validate-user-provided-tunnel-names.patch queue-4.9/sctp-do-not-leak-kernel-memory-to-user-space.patch queue-4.9/ip_tunnel-better-validate-user-provided-tunnel-names.patch queue-4.9/skbuff-only-inherit-relevant-tx_flags.patch queue-4.9/netlink-make-sure-nladdr-has-correct-size-in-netlink_connect.patch queue-4.9/ip6_gre-better-validate-user-provided-tunnel-names.patch