The series is intended for stable@vger.kernel.org # 5.4+
Syzkaller reported the following bug on linux-5.{4, 10, 15}.y: https://syzkaller.appspot.com/bug?id=ce5575575f074c33ff80d104f5baee26f22e95f...
The upstream commit that introduces this bug is: 1ed1d5921139 ("net: skip virtio_net_hdr_set_proto if protocol already set")
Upstream fixes the bug with the following commits, one of which introduces new support: e9d3f80935b6 ("net/af_packet: make sure to pull mac header") dfed913e8b55 ("net/af_packet: add VLAN support for AF_PACKET SOCK_RAW GSO")
The additional logic and risk backported seems manageable.
The blammed commit introduces a kernel BUG in __skb_gso_segment for AF_PACKET SOCK_RAW GSO VLAN tagged packets. What happens is that virtio_net_hdr_set_proto() exists early as skb->protocol is already set to ETH_P_ALL. Then in packet_parse_headers() skb->protocol is set to ETH_P_8021AD, but neither the network header position is adjusted, nor the mac header is pulled. Thus when we get to validate the xmit skb and enter skb_mac_gso_segment(), skb->mac_len has value 14, but vlan_depth gets updated to 18 after skb_network_protocol() is called. This causes the BUG_ON from __skb_pull(skb, vlan_depth) to be hit, as the mac header has not been pulled yet.
The fixes from upstream backported cleanly without conflicts. I updated the commit message of the first patch to describe the problem encountered, and added Cc, Fixes, Reported-by and Tested-by tags. For the second patch I just added Cc to stable indicating the versions to be fixed, and added my Tested and Signed-off-by tags.
I tested the patches on linux-5.{4, 10, 15}.y.
Eric Dumazet (1): net/af_packet: make sure to pull mac header
Hangbin Liu (1): net/af_packet: add VLAN support for AF_PACKET SOCK_RAW GSO
net/packet/af_packet.c | 20 +++++++++++++++----- 1 file changed, 15 insertions(+), 5 deletions(-)
From: Hangbin Liu liuhangbin@gmail.com
[ Upstream commit dfed913e8b55a0c2c4906f1242fd38fd9a116e49 ]
Before the blammed commit, the kernel drops GSO VLAN tagged packet if it's created with socket(AF_PACKET, SOCK_RAW, 0) plus virtio_net_hdr. The reason is AF_PACKET doesn't adjust the skb network header if there is a VLAN tag. Then after virtio_net_hdr_set_proto() called, the skb->protocol will be set to ETH_P_IP/IPv6. And in later inet/ipv6_gso_segment() the skb is dropped as network header position is invalid.
The blammed commit introduces a kernel BUG in __skb_gso_segment for AF_PACKET SOCK_RAW GSO VLAN tagged packets. What happens is that virtio_net_hdr_set_proto() exists early as skb->protocol is already set to ETH_P_ALL. Then in packet_parse_headers() skb->protocol is set to ETH_P_8021AD, but neither the network header position is adjusted, nor the mac header is pulled. Thus when we get to validate the xmit skb and enter skb_mac_gso_segment(), skb->mac_len has value 14, but vlan_depth gets updated to 18 after skb_network_protocol() is called. This causes the BUG_ON from __skb_pull(skb, vlan_depth) to be hit, as the mac header has not been pulled yet.
Let's handle VLAN packets by adjusting network header position in packet_parse_headers(). The adjustment is safe and does not affect the later xmit as tap device also did that. The mac header pull is handled in a following commit: commit e9d3f80935b6 ("net/af_packet: make sure to pull mac header")
In packet_snd(), packet_parse_headers() need to be moved before calling virtio_net_hdr_set_proto(), so we can set correct skb->protocol and network header first.
There is no need to update tpacket_snd() as it calls packet_parse_headers() in tpacket_fill_skb(), which is already before calling virtio_net_hdr_* functions.
skb->no_fcs setting is also moved upper to make all skb settings together and keep consistency with function packet_sendmsg_spkt().
Cc: stable@vger.kernel.org # 5.4+ Fixes: 1ed1d5921139 ("net: skip virtio_net_hdr_set_proto if protocol already set") Reported-by: syzbot+3d91b8dbbcf515400e92@syzkaller.appspotmail.com Signed-off-by: Hangbin Liu liuhangbin@gmail.com Acked-by: Willem de Bruijn willemb@google.com Acked-by: Michael S. Tsirkin mst@redhat.com Link: https://lore.kernel.org/r/20220425014502.985464-1-liuhangbin@gmail.com Signed-off-by: Paolo Abeni pabeni@redhat.com Tested-by: Tudor Ambarus tudor.ambarus@linaro.org [ta: Update commit description, add Cc, Fixes, Reported-by and Tested-by.] Signed-off-by: Tudor Ambarus tudor.ambarus@linaro.org --- net/packet/af_packet.c | 18 +++++++++++++----- 1 file changed, 13 insertions(+), 5 deletions(-)
diff --git a/net/packet/af_packet.c b/net/packet/af_packet.c index ceca0d6c41b5..f25fa75fe651 100644 --- a/net/packet/af_packet.c +++ b/net/packet/af_packet.c @@ -1888,12 +1888,20 @@ static int packet_rcv_spkt(struct sk_buff *skb, struct net_device *dev,
static void packet_parse_headers(struct sk_buff *skb, struct socket *sock) { + int depth; + if ((!skb->protocol || skb->protocol == htons(ETH_P_ALL)) && sock->type == SOCK_RAW) { skb_reset_mac_header(skb); skb->protocol = dev_parse_header_protocol(skb); }
+ /* Move network header to the right position for VLAN tagged packets */ + if (likely(skb->dev->type == ARPHRD_ETHER) && + eth_type_vlan(skb->protocol) && + __vlan_get_protocol(skb, skb->protocol, &depth) != 0) + skb_set_network_header(skb, depth); + skb_probe_transport_header(skb); }
@@ -3008,6 +3016,11 @@ static int packet_snd(struct socket *sock, struct msghdr *msg, size_t len) skb->mark = sockc.mark; skb->tstamp = sockc.transmit_time;
+ if (unlikely(extra_len == 4)) + skb->no_fcs = 1; + + packet_parse_headers(skb, sock); + if (has_vnet_hdr) { err = virtio_net_hdr_to_skb(skb, &vnet_hdr, vio_le()); if (err) @@ -3016,11 +3029,6 @@ static int packet_snd(struct socket *sock, struct msghdr *msg, size_t len) virtio_net_hdr_set_proto(skb, &vnet_hdr); }
- packet_parse_headers(skb, sock); - - if (unlikely(extra_len == 4)) - skb->no_fcs = 1; - err = po->xmit(skb); if (unlikely(err != 0)) { if (err > 0)
From: Eric Dumazet edumazet@google.com
[ Upstream commit e9d3f80935b6607dcdc5682b00b1d4b28e0a0c5d ]
GSO assumes skb->head contains link layer headers.
tun device in some case can provide base 14 bytes, regardless of VLAN being used or not.
After blamed commit, we can end up setting a network header offset of 18+, we better pull the missing bytes to avoid a posible crash in GSO.
syzbot report was: kernel BUG at include/linux/skbuff.h:2699! invalid opcode: 0000 [#1] PREEMPT SMP KASAN CPU: 1 PID: 3601 Comm: syz-executor210 Not tainted 5.18.0-syzkaller-11338-g2c5ca23f7414 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:__skb_pull include/linux/skbuff.h:2699 [inline] RIP: 0010:skb_mac_gso_segment+0x48f/0x530 net/core/gro.c:136 Code: 00 48 c7 c7 00 96 d4 8a c6 05 cb d3 45 06 01 e8 26 bb d0 01 e9 2f fd ff ff 49 c7 c4 ea ff ff ff e9 f1 fe ff ff e8 91 84 19 fa <0f> 0b 48 89 df e8 97 44 66 fa e9 7f fd ff ff e8 ad 44 66 fa e9 48 RSP: 0018:ffffc90002e2f4b8 EFLAGS: 00010293 RAX: 0000000000000000 RBX: 0000000000000012 RCX: 0000000000000000 RDX: ffff88805bb58000 RSI: ffffffff8760ed0f RDI: 0000000000000004 RBP: 0000000000005dbc R08: 0000000000000004 R09: 0000000000000fe0 R10: 0000000000000fe4 R11: 0000000000000000 R12: 0000000000000fe0 R13: ffff88807194d780 R14: 1ffff920005c5e9b R15: 0000000000000012 FS: 000055555730f300(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00000000200015c0 CR3: 0000000071ff8000 CR4: 0000000000350ee0 Call Trace: <TASK> __skb_gso_segment+0x327/0x6e0 net/core/dev.c:3411 skb_gso_segment include/linux/netdevice.h:4749 [inline] validate_xmit_skb+0x6bc/0xf10 net/core/dev.c:3669 validate_xmit_skb_list+0xbc/0x120 net/core/dev.c:3719 sch_direct_xmit+0x3d1/0xbe0 net/sched/sch_generic.c:327 __dev_xmit_skb net/core/dev.c:3815 [inline] __dev_queue_xmit+0x14a1/0x3a00 net/core/dev.c:4219 packet_snd net/packet/af_packet.c:3071 [inline] packet_sendmsg+0x21cb/0x5550 net/packet/af_packet.c:3102 sock_sendmsg_nosec net/socket.c:714 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:734 ____sys_sendmsg+0x6eb/0x810 net/socket.c:2492 ___sys_sendmsg+0xf3/0x170 net/socket.c:2546 __sys_sendmsg net/socket.c:2575 [inline] __do_sys_sendmsg net/socket.c:2584 [inline] __se_sys_sendmsg net/socket.c:2582 [inline] __x64_sys_sendmsg+0x132/0x220 net/socket.c:2582 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x46/0xb0 RIP: 0033:0x7f4b95da06c9 Code: 28 c3 e8 4a 15 00 00 66 2e 0f 1f 84 00 00 00 00 00 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 73 01 c3 48 c7 c1 c0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffd7defc4c8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007ffd7defc4f0 RCX: 00007f4b95da06c9 RDX: 0000000000000000 RSI: 0000000020000140 RDI: 0000000000000003 RBP: 0000000000000003 R08: bb1414ac00000050 R09: bb1414ac00000050 R10: 0000000000000004 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffd7defc4e0 R14: 00007ffd7defc4d8 R15: 00007ffd7defc4d4 </TASK>
Cc: stable@vger.kernel.org # 5.4+ Fixes: dfed913e8b55 ("net/af_packet: add VLAN support for AF_PACKET SOCK_RAW GSO") Signed-off-by: Eric Dumazet edumazet@google.com Reported-by: syzbot syzkaller@googlegroups.com Acked-by: Hangbin Liu liuhangbin@gmail.com Acked-by: Willem de Bruijn willemb@google.com Cc: Michael S. Tsirkin mst@redhat.com Signed-off-by: Jakub Kicinski kuba@kernel.org Tested-by: Tudor Ambarus tudor.ambarus@linaro.org Signed-off-by: Tudor Ambarus tudor.ambarus@linaro.org --- net/packet/af_packet.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/net/packet/af_packet.c b/net/packet/af_packet.c index f25fa75fe651..7f9f2d0ef0e6 100644 --- a/net/packet/af_packet.c +++ b/net/packet/af_packet.c @@ -1899,8 +1899,10 @@ static void packet_parse_headers(struct sk_buff *skb, struct socket *sock) /* Move network header to the right position for VLAN tagged packets */ if (likely(skb->dev->type == ARPHRD_ETHER) && eth_type_vlan(skb->protocol) && - __vlan_get_protocol(skb, skb->protocol, &depth) != 0) - skb_set_network_header(skb, depth); + __vlan_get_protocol(skb, skb->protocol, &depth) != 0) { + if (pskb_may_pull(skb, depth)) + skb_set_network_header(skb, depth); + }
skb_probe_transport_header(skb); }
On Thu, Dec 22, 2022 at 10:35:43AM +0200, Tudor Ambarus wrote:
The series is intended for stable@vger.kernel.org # 5.4+
Syzkaller reported the following bug on linux-5.{4, 10, 15}.y: https://syzkaller.appspot.com/bug?id=ce5575575f074c33ff80d104f5baee26f22e95f...
The upstream commit that introduces this bug is: 1ed1d5921139 ("net: skip virtio_net_hdr_set_proto if protocol already set")
Upstream fixes the bug with the following commits, one of which introduces new support: e9d3f80935b6 ("net/af_packet: make sure to pull mac header") dfed913e8b55 ("net/af_packet: add VLAN support for AF_PACKET SOCK_RAW GSO")
The additional logic and risk backported seems manageable.
The blammed commit introduces a kernel BUG in __skb_gso_segment for AF_PACKET SOCK_RAW GSO VLAN tagged packets. What happens is that virtio_net_hdr_set_proto() exists early as skb->protocol is already set to ETH_P_ALL. Then in packet_parse_headers() skb->protocol is set to ETH_P_8021AD, but neither the network header position is adjusted, nor the mac header is pulled. Thus when we get to validate the xmit skb and enter skb_mac_gso_segment(), skb->mac_len has value 14, but vlan_depth gets updated to 18 after skb_network_protocol() is called. This causes the BUG_ON from __skb_pull(skb, vlan_depth) to be hit, as the mac header has not been pulled yet.
The fixes from upstream backported cleanly without conflicts. I updated the commit message of the first patch to describe the problem encountered, and added Cc, Fixes, Reported-by and Tested-by tags. For the second patch I just added Cc to stable indicating the versions to be fixed, and added my Tested and Signed-off-by tags.
I tested the patches on linux-5.{4, 10, 15}.y.
Eric Dumazet (1): net/af_packet: make sure to pull mac header
Hangbin Liu (1): net/af_packet: add VLAN support for AF_PACKET SOCK_RAW GSO
net/packet/af_packet.c | 20 +++++++++++++++----- 1 file changed, 15 insertions(+), 5 deletions(-)
Now queued up, thanks.
greg k-h
linux-stable-mirror@lists.linaro.org
-
Greg KH -
Tudor Ambarus