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26fc181e6c
Both gue_err() and gue6_err() incorrectly assume
linear skbs. Fix them to use pskb_may_pull().
BUG: KMSAN: uninit-value in gue6_err+0x475/0xc40 net/ipv6/fou6.c:101
CPU: 0 PID: 18083 Comm: syz-executor1 Not tainted 5.0.0-rc1+ #7
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
<IRQ>
__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
__msan_warning+0x82/0xf0 mm/kmsan/kmsan_instr.c:313
gue6_err+0x475/0xc40 net/ipv6/fou6.c:101
__udp6_lib_err_encap_no_sk net/ipv6/udp.c:434 [inline]
__udp6_lib_err_encap net/ipv6/udp.c:491 [inline]
__udp6_lib_err+0x18d0/0x2590 net/ipv6/udp.c:522
udplitev6_err+0x118/0x130 net/ipv6/udplite.c:27
icmpv6_notify+0x462/0x9f0 net/ipv6/icmp.c:784
icmpv6_rcv+0x18ac/0x3fa0 net/ipv6/icmp.c:872
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
do_softirq_own_stack+0x49/0x80 arch/x86/entry/entry_64.S:1039
</IRQ>
do_softirq kernel/softirq.c:338 [inline]
__local_bh_enable_ip+0x16f/0x1a0 kernel/softirq.c:190
local_bh_enable+0x36/0x40 include/linux/bottom_half.h:32
rcu_read_unlock_bh include/linux/rcupdate.h:696 [inline]
ip6_finish_output2+0x1d64/0x25f0 net/ipv6/ip6_output.c:121
ip6_finish_output+0xae4/0xbc0 net/ipv6/ip6_output.c:154
NF_HOOK_COND include/linux/netfilter.h:278 [inline]
ip6_output+0x5ca/0x710 net/ipv6/ip6_output.c:171
dst_output include/net/dst.h:444 [inline]
ip6_local_out+0x164/0x1d0 net/ipv6/output_core.c:176
ip6_send_skb+0xfa/0x390 net/ipv6/ip6_output.c:1727
udp_v6_send_skb+0x1733/0x1d20 net/ipv6/udp.c:1169
udpv6_sendmsg+0x424e/0x45d0 net/ipv6/udp.c:1466
inet_sendmsg+0x54a/0x720 net/ipv4/af_inet.c:798
sock_sendmsg_nosec net/socket.c:621 [inline]
sock_sendmsg net/socket.c:631 [inline]
___sys_sendmsg+0xdb9/0x11b0 net/socket.c:2116
__sys_sendmmsg+0x580/0xad0 net/socket.c:2211
__do_sys_sendmmsg net/socket.c:2240 [inline]
__se_sys_sendmmsg+0xbd/0xe0 net/socket.c:2237
__x64_sys_sendmmsg+0x56/0x70 net/socket.c:2237
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:00007f4a5204fc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000133
RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 0000000000457ec9
RDX: 00000000040001ab RSI: 0000000020000240 RDI: 0000000000000003
RBP: 000000000073bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f4a520506d4
R13: 00000000004c4ce5 R14: 00000000004d85d8 R15: 00000000ffffffff
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
kmsan_slab_alloc+0xe/0x10 mm/kmsan/kmsan_hooks.c:185
slab_post_alloc_hook mm/slab.h:446 [inline]
slab_alloc_node mm/slub.c:2754 [inline]
__kmalloc_node_track_caller+0xe9e/0xff0 mm/slub.c:4377
__kmalloc_reserve net/core/skbuff.c:140 [inline]
__alloc_skb+0x309/0xa20 net/core/skbuff.c:208
alloc_skb include/linux/skbuff.h:1012 [inline]
alloc_skb_with_frags+0x1c7/0xac0 net/core/skbuff.c:5288
sock_alloc_send_pskb+0xafd/0x10a0 net/core/sock.c:2091
sock_alloc_send_skb+0xca/0xe0 net/core/sock.c:2108
__ip6_append_data+0x42ed/0x5dc0 net/ipv6/ip6_output.c:1443
ip6_append_data+0x3c2/0x650 net/ipv6/ip6_output.c:1619
icmp6_send+0x2f5c/0x3c40 net/ipv6/icmp.c:574
icmpv6_send+0xe5/0x110 net/ipv6/ip6_icmp.c:43
ip6_link_failure+0x5c/0x2c0 net/ipv6/route.c:2231
dst_link_failure include/net/dst.h:427 [inline]
vti_xmit net/ipv4/ip_vti.c:229 [inline]
vti_tunnel_xmit+0xf3b/0x1ea0 net/ipv4/ip_vti.c:265
__netdev_start_xmit include/linux/netdevice.h:4382 [inline]
netdev_start_xmit include/linux/netdevice.h:4391 [inline]
xmit_one net/core/dev.c:3278 [inline]
dev_hard_start_xmit+0x604/0xc40 net/core/dev.c:3294
__dev_queue_xmit+0x2e48/0x3b80 net/core/dev.c:3864
dev_queue_xmit+0x4b/0x60 net/core/dev.c:3897
neigh_direct_output+0x42/0x50 net/core/neighbour.c:1511
neigh_output include/net/neighbour.h:508 [inline]
ip6_finish_output2+0x1d4e/0x25f0 net/ipv6/ip6_output.c:120
ip6_finish_output+0xae4/0xbc0 net/ipv6/ip6_output.c:154
NF_HOOK_COND include/linux/netfilter.h:278 [inline]
ip6_output+0x5ca/0x710 net/ipv6/ip6_output.c:171
dst_output include/net/dst.h:444 [inline]
ip6_local_out+0x164/0x1d0 net/ipv6/output_core.c:176
ip6_send_skb+0xfa/0x390 net/ipv6/ip6_output.c:1727
udp_v6_send_skb+0x1733/0x1d20 net/ipv6/udp.c:1169
udpv6_sendmsg+0x424e/0x45d0 net/ipv6/udp.c:1466
inet_sendmsg+0x54a/0x720 net/ipv4/af_inet.c:798
sock_sendmsg_nosec net/socket.c:621 [inline]
sock_sendmsg net/socket.c:631 [inline]
___sys_sendmsg+0xdb9/0x11b0 net/socket.c:2116
__sys_sendmmsg+0x580/0xad0 net/socket.c:2211
__do_sys_sendmmsg net/socket.c:2240 [inline]
__se_sys_sendmmsg+0xbd/0xe0 net/socket.c:2237
__x64_sys_sendmmsg+0x56/0x70 net/socket.c:2237
do_syscall_64+0xbc/0xf0 arch/x86/entry/common.c:291
entry_SYSCALL_64_after_hwframe+0x63/0xe7
Fixes: b8a51b38e4
("fou, fou6: ICMP error handlers for FoU and GUE")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Reported-by: syzbot <syzkaller@googlegroups.com>
Cc: Stefano Brivio <sbrivio@redhat.com>
Cc: Sabrina Dubroca <sd@queasysnail.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
226 lines
4.9 KiB
C
226 lines
4.9 KiB
C
#include <linux/module.h>
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#include <linux/errno.h>
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#include <linux/socket.h>
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#include <linux/skbuff.h>
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#include <linux/ip.h>
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#include <linux/udp.h>
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#include <linux/icmpv6.h>
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#include <linux/types.h>
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#include <linux/kernel.h>
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#include <net/fou.h>
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#include <net/ip.h>
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#include <net/ip6_tunnel.h>
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#include <net/ip6_checksum.h>
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#include <net/protocol.h>
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#include <net/udp.h>
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#include <net/udp_tunnel.h>
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#if IS_ENABLED(CONFIG_IPV6_FOU_TUNNEL)
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static void fou6_build_udp(struct sk_buff *skb, struct ip_tunnel_encap *e,
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struct flowi6 *fl6, u8 *protocol, __be16 sport)
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{
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struct udphdr *uh;
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skb_push(skb, sizeof(struct udphdr));
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skb_reset_transport_header(skb);
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uh = udp_hdr(skb);
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uh->dest = e->dport;
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uh->source = sport;
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uh->len = htons(skb->len);
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udp6_set_csum(!(e->flags & TUNNEL_ENCAP_FLAG_CSUM6), skb,
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&fl6->saddr, &fl6->daddr, skb->len);
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*protocol = IPPROTO_UDP;
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}
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static int fou6_build_header(struct sk_buff *skb, struct ip_tunnel_encap *e,
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u8 *protocol, struct flowi6 *fl6)
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{
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__be16 sport;
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int err;
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int type = e->flags & TUNNEL_ENCAP_FLAG_CSUM6 ?
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SKB_GSO_UDP_TUNNEL_CSUM : SKB_GSO_UDP_TUNNEL;
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err = __fou_build_header(skb, e, protocol, &sport, type);
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if (err)
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return err;
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fou6_build_udp(skb, e, fl6, protocol, sport);
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return 0;
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}
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static int gue6_build_header(struct sk_buff *skb, struct ip_tunnel_encap *e,
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u8 *protocol, struct flowi6 *fl6)
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{
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__be16 sport;
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int err;
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int type = e->flags & TUNNEL_ENCAP_FLAG_CSUM6 ?
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SKB_GSO_UDP_TUNNEL_CSUM : SKB_GSO_UDP_TUNNEL;
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err = __gue_build_header(skb, e, protocol, &sport, type);
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if (err)
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return err;
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fou6_build_udp(skb, e, fl6, protocol, sport);
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return 0;
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}
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static int gue6_err_proto_handler(int proto, struct sk_buff *skb,
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struct inet6_skb_parm *opt,
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u8 type, u8 code, int offset, u32 info)
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{
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const struct inet6_protocol *ipprot;
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ipprot = rcu_dereference(inet6_protos[proto]);
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if (ipprot && ipprot->err_handler) {
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if (!ipprot->err_handler(skb, opt, type, code, offset, info))
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return 0;
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}
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return -ENOENT;
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}
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static int gue6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
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u8 type, u8 code, int offset, __be32 info)
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{
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int transport_offset = skb_transport_offset(skb);
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struct guehdr *guehdr;
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size_t len, optlen;
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int ret;
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len = sizeof(struct udphdr) + sizeof(struct guehdr);
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if (!pskb_may_pull(skb, len))
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return -EINVAL;
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guehdr = (struct guehdr *)&udp_hdr(skb)[1];
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switch (guehdr->version) {
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case 0: /* Full GUE header present */
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break;
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case 1: {
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/* Direct encasulation of IPv4 or IPv6 */
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skb_set_transport_header(skb, -(int)sizeof(struct icmp6hdr));
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switch (((struct iphdr *)guehdr)->version) {
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case 4:
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ret = gue6_err_proto_handler(IPPROTO_IPIP, skb, opt,
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type, code, offset, info);
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goto out;
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case 6:
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ret = gue6_err_proto_handler(IPPROTO_IPV6, skb, opt,
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type, code, offset, info);
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goto out;
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default:
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ret = -EOPNOTSUPP;
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goto out;
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}
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}
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default: /* Undefined version */
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return -EOPNOTSUPP;
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}
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if (guehdr->control)
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return -ENOENT;
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optlen = guehdr->hlen << 2;
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if (!pskb_may_pull(skb, len + optlen))
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return -EINVAL;
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guehdr = (struct guehdr *)&udp_hdr(skb)[1];
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if (validate_gue_flags(guehdr, optlen))
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return -EINVAL;
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/* Handling exceptions for direct UDP encapsulation in GUE would lead to
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* recursion. Besides, this kind of encapsulation can't even be
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* configured currently. Discard this.
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*/
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if (guehdr->proto_ctype == IPPROTO_UDP ||
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guehdr->proto_ctype == IPPROTO_UDPLITE)
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return -EOPNOTSUPP;
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skb_set_transport_header(skb, -(int)sizeof(struct icmp6hdr));
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ret = gue6_err_proto_handler(guehdr->proto_ctype, skb,
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opt, type, code, offset, info);
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out:
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skb_set_transport_header(skb, transport_offset);
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return ret;
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}
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static const struct ip6_tnl_encap_ops fou_ip6tun_ops = {
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.encap_hlen = fou_encap_hlen,
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.build_header = fou6_build_header,
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.err_handler = gue6_err,
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};
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static const struct ip6_tnl_encap_ops gue_ip6tun_ops = {
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.encap_hlen = gue_encap_hlen,
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.build_header = gue6_build_header,
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.err_handler = gue6_err,
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};
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static int ip6_tnl_encap_add_fou_ops(void)
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{
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int ret;
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ret = ip6_tnl_encap_add_ops(&fou_ip6tun_ops, TUNNEL_ENCAP_FOU);
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if (ret < 0) {
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pr_err("can't add fou6 ops\n");
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return ret;
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}
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ret = ip6_tnl_encap_add_ops(&gue_ip6tun_ops, TUNNEL_ENCAP_GUE);
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if (ret < 0) {
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pr_err("can't add gue6 ops\n");
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ip6_tnl_encap_del_ops(&fou_ip6tun_ops, TUNNEL_ENCAP_FOU);
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return ret;
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}
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return 0;
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}
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static void ip6_tnl_encap_del_fou_ops(void)
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{
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ip6_tnl_encap_del_ops(&fou_ip6tun_ops, TUNNEL_ENCAP_FOU);
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ip6_tnl_encap_del_ops(&gue_ip6tun_ops, TUNNEL_ENCAP_GUE);
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}
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#else
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static int ip6_tnl_encap_add_fou_ops(void)
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{
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return 0;
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}
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static void ip6_tnl_encap_del_fou_ops(void)
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{
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}
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#endif
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static int __init fou6_init(void)
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{
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int ret;
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ret = ip6_tnl_encap_add_fou_ops();
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return ret;
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}
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static void __exit fou6_fini(void)
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{
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ip6_tnl_encap_del_fou_ops();
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}
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module_init(fou6_init);
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module_exit(fou6_fini);
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MODULE_AUTHOR("Tom Herbert <therbert@google.com>");
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MODULE_LICENSE("GPL");
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