cve-2024-36933
Vulnerability from cvelistv5
Published
2024-05-30 15:29
Modified
2024-09-12 16:02
Severity
Summary
nsh: Restore skb->{protocol,data,mac_header} for outer header in nsh_gso_segment().
References
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnsh: Restore skb-\u003e{protocol,data,mac_header} for outer header in nsh_gso_segment().\n\nsyzbot triggered various splats (see [0] and links) by a crafted GSO\npacket of VIRTIO_NET_HDR_GSO_UDP layering the following protocols:\n\n ETH_P_8021AD + ETH_P_NSH + ETH_P_IPV6 + IPPROTO_UDP\n\nNSH can encapsulate IPv4, IPv6, Ethernet, NSH, and MPLS. As the inner\nprotocol can be Ethernet, NSH GSO handler, nsh_gso_segment(), calls\nskb_mac_gso_segment() to invoke inner protocol GSO handlers.\n\nnsh_gso_segment() does the following for the original skb before\ncalling skb_mac_gso_segment()\n\n 1. reset skb-\u003enetwork_header\n 2. save the original skb-\u003e{mac_heaeder,mac_len} in a local variable\n 3. pull the NSH header\n 4. resets skb-\u003emac_header\n 5. set up skb-\u003emac_len and skb-\u003eprotocol for the inner protocol.\n\nand does the following for the segmented skb\n\n 6. set ntohs(ETH_P_NSH) to skb-\u003eprotocol\n 7. push the NSH header\n 8. restore skb-\u003emac_header\n 9. set skb-\u003emac_header + mac_len to skb-\u003enetwork_header\n 10. restore skb-\u003emac_len\n\nThere are two problems in 6-7 and 8-9.\n\n (a)\n After 6 \u0026 7, skb-\u003edata points to the NSH header, so the outer header\n (ETH_P_8021AD in this case) is stripped when skb is sent out of netdev.\n\n Also, if NSH is encapsulated by NSH + Ethernet (so NSH-Ethernet-NSH),\n skb_pull() in the first nsh_gso_segment() will make skb-\u003edata point\n to the middle of the outer NSH or Ethernet header because the Ethernet\n header is not pulled by the second nsh_gso_segment().\n\n (b)\n While restoring skb-\u003e{mac_header,network_header} in 8 \u0026 9,\n nsh_gso_segment() does not assume that the data in the linear\n buffer is shifted.\n\n However, udp6_ufo_fragment() could shift the data and change\n skb-\u003emac_header accordingly as demonstrated by syzbot.\n\n If this happens, even the restored skb-\u003emac_header points to\n the middle of the outer header.\n\nIt seems nsh_gso_segment() has never worked with outer headers so far.\n\nAt the end of nsh_gso_segment(), the outer header must be restored for\nthe segmented skb, instead of the NSH header.\n\nTo do that, let\u0027s calculate the outer header position relatively from\nthe inner header and set skb-\u003e{data,mac_header,protocol} properly.\n\n[0]:\nBUG: KMSAN: uninit-value in ipvlan_process_outbound drivers/net/ipvlan/ipvlan_core.c:524 [inline]\nBUG: KMSAN: uninit-value in ipvlan_xmit_mode_l3 drivers/net/ipvlan/ipvlan_core.c:602 [inline]\nBUG: KMSAN: uninit-value in ipvlan_queue_xmit+0xf44/0x16b0 drivers/net/ipvlan/ipvlan_core.c:668\n ipvlan_process_outbound drivers/net/ipvlan/ipvlan_core.c:524 [inline]\n ipvlan_xmit_mode_l3 drivers/net/ipvlan/ipvlan_core.c:602 [inline]\n ipvlan_queue_xmit+0xf44/0x16b0 drivers/net/ipvlan/ipvlan_core.c:668\n ipvlan_start_xmit+0x5c/0x1a0 drivers/net/ipvlan/ipvlan_main.c:222\n __netdev_start_xmit include/linux/netdevice.h:4989 [inline]\n netdev_start_xmit include/linux/netdevice.h:5003 [inline]\n xmit_one net/core/dev.c:3547 [inline]\n dev_hard_start_xmit+0x244/0xa10 net/core/dev.c:3563\n __dev_queue_xmit+0x33ed/0x51c0 net/core/dev.c:4351\n dev_queue_xmit include/linux/netdevice.h:3171 [inline]\n packet_xmit+0x9c/0x6b0 net/packet/af_packet.c:276\n packet_snd net/packet/af_packet.c:3081 [inline]\n packet_sendmsg+0x8aef/0x9f10 net/packet/af_packet.c:3113\n sock_sendmsg_nosec net/socket.c:730 [inline]\n __sock_sendmsg net/socket.c:745 [inline]\n __sys_sendto+0x735/0xa10 net/socket.c:2191\n __do_sys_sendto net/socket.c:2203 [inline]\n __se_sys_sendto net/socket.c:2199 [inline]\n __x64_sys_sendto+0x125/0x1c0 net/socket.c:2199\n do_syscall_x64 arch/x86/entry/common.c:52 [inline]\n do_syscall_64+0xcf/0x1e0 arch/x86/entry/common.c:83\n entry_SYSCALL_64_after_hwframe+0x63/0x6b\n\nUninit was created at:\n slab_post_alloc_hook mm/slub.c:3819 [inline]\n slab_alloc_node mm/slub.c:3860 [inline]\n __do_kmalloc_node mm/slub.c:3980 [inline]\n __kmalloc_node_track_caller+0x705/0x1000 mm/slub.c:4001\n kmalloc_reserve+0x249/0x4a0 net/core/skbuff.c:582\n __\n---truncated---"
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"title": "nsh: Restore skb-\u003e{protocol,data,mac_header} for outer header in nsh_gso_segment().",
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"nvd": "{\"cve\":{\"id\":\"CVE-2024-36933\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-05-30T16:15:16.463\",\"lastModified\":\"2024-06-27T14:15:14.717\",\"vulnStatus\":\"Awaiting Analysis\",\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nnsh: Restore skb-\u003e{protocol,data,mac_header} for outer header in nsh_gso_segment().\\n\\nsyzbot triggered various splats (see [0] and links) by a crafted GSO\\npacket of VIRTIO_NET_HDR_GSO_UDP layering the following protocols:\\n\\n ETH_P_8021AD + ETH_P_NSH + ETH_P_IPV6 + IPPROTO_UDP\\n\\nNSH can encapsulate IPv4, IPv6, Ethernet, NSH, and MPLS. As the inner\\nprotocol can be Ethernet, NSH GSO handler, nsh_gso_segment(), calls\\nskb_mac_gso_segment() to invoke inner protocol GSO handlers.\\n\\nnsh_gso_segment() does the following for the original skb before\\ncalling skb_mac_gso_segment()\\n\\n 1. reset skb-\u003enetwork_header\\n 2. save the original skb-\u003e{mac_heaeder,mac_len} in a local variable\\n 3. pull the NSH header\\n 4. resets skb-\u003emac_header\\n 5. set up skb-\u003emac_len and skb-\u003eprotocol for the inner protocol.\\n\\nand does the following for the segmented skb\\n\\n 6. set ntohs(ETH_P_NSH) to skb-\u003eprotocol\\n 7. push the NSH header\\n 8. restore skb-\u003emac_header\\n 9. set skb-\u003emac_header + mac_len to skb-\u003enetwork_header\\n 10. restore skb-\u003emac_len\\n\\nThere are two problems in 6-7 and 8-9.\\n\\n (a)\\n After 6 \u0026 7, skb-\u003edata points to the NSH header, so the outer header\\n (ETH_P_8021AD in this case) is stripped when skb is sent out of netdev.\\n\\n Also, if NSH is encapsulated by NSH + Ethernet (so NSH-Ethernet-NSH),\\n skb_pull() in the first nsh_gso_segment() will make skb-\u003edata point\\n to the middle of the outer NSH or Ethernet header because the Ethernet\\n header is not pulled by the second nsh_gso_segment().\\n\\n (b)\\n While restoring skb-\u003e{mac_header,network_header} in 8 \u0026 9,\\n nsh_gso_segment() does not assume that the data in the linear\\n buffer is shifted.\\n\\n However, udp6_ufo_fragment() could shift the data and change\\n skb-\u003emac_header accordingly as demonstrated by syzbot.\\n\\n If this happens, even the restored skb-\u003emac_header points to\\n the middle of the outer header.\\n\\nIt seems nsh_gso_segment() has never worked with outer headers so far.\\n\\nAt the end of nsh_gso_segment(), the outer header must be restored for\\nthe segmented skb, instead of the NSH header.\\n\\nTo do that, let\u0027s calculate the outer header position relatively from\\nthe inner header and set skb-\u003e{data,mac_header,protocol} properly.\\n\\n[0]:\\nBUG: KMSAN: uninit-value in ipvlan_process_outbound drivers/net/ipvlan/ipvlan_core.c:524 [inline]\\nBUG: KMSAN: uninit-value in ipvlan_xmit_mode_l3 drivers/net/ipvlan/ipvlan_core.c:602 [inline]\\nBUG: KMSAN: uninit-value in ipvlan_queue_xmit+0xf44/0x16b0 drivers/net/ipvlan/ipvlan_core.c:668\\n ipvlan_process_outbound drivers/net/ipvlan/ipvlan_core.c:524 [inline]\\n ipvlan_xmit_mode_l3 drivers/net/ipvlan/ipvlan_core.c:602 [inline]\\n ipvlan_queue_xmit+0xf44/0x16b0 drivers/net/ipvlan/ipvlan_core.c:668\\n ipvlan_start_xmit+0x5c/0x1a0 drivers/net/ipvlan/ipvlan_main.c:222\\n __netdev_start_xmit include/linux/netdevice.h:4989 [inline]\\n netdev_start_xmit include/linux/netdevice.h:5003 [inline]\\n xmit_one net/core/dev.c:3547 [inline]\\n dev_hard_start_xmit+0x244/0xa10 net/core/dev.c:3563\\n __dev_queue_xmit+0x33ed/0x51c0 net/core/dev.c:4351\\n dev_queue_xmit include/linux/netdevice.h:3171 [inline]\\n packet_xmit+0x9c/0x6b0 net/packet/af_packet.c:276\\n packet_snd net/packet/af_packet.c:3081 [inline]\\n packet_sendmsg+0x8aef/0x9f10 net/packet/af_packet.c:3113\\n sock_sendmsg_nosec net/socket.c:730 [inline]\\n __sock_sendmsg net/socket.c:745 [inline]\\n __sys_sendto+0x735/0xa10 net/socket.c:2191\\n __do_sys_sendto net/socket.c:2203 [inline]\\n __se_sys_sendto net/socket.c:2199 [inline]\\n __x64_sys_sendto+0x125/0x1c0 net/socket.c:2199\\n do_syscall_x64 arch/x86/entry/common.c:52 [inline]\\n do_syscall_64+0xcf/0x1e0 arch/x86/entry/common.c:83\\n entry_SYSCALL_64_after_hwframe+0x63/0x6b\\n\\nUninit was created at:\\n slab_post_alloc_hook mm/slub.c:3819 [inline]\\n slab_alloc_node mm/slub.c:3860 [inline]\\n __do_kmalloc_node mm/slub.c:3980 [inline]\\n __kmalloc_node_track_caller+0x705/0x1000 mm/slub.c:4001\\n kmalloc_reserve+0x249/0x4a0 net/core/skbuff.c:582\\n __\\n---truncated---\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: nsh: restaurar skb-\u0026gt;{protocol,data,mac_header} para el encabezado externo en nsh_gso_segment(). syzbot activ\u00f3 varios s\u00edmbolos (ver [0] y enlaces) mediante un paquete GSO manipulado de VIRTIO_NET_HDR_GSO_UDP que superpone los siguientes protocolos: ETH_P_8021AD + ETH_P_NSH + ETH_P_IPV6 + IPPROTO_UDP NSH puede encapsular IPv4, IPv6, Ethernet, NSH y MPLS. Como el protocolo interno puede ser Ethernet, el controlador NSH GSO, nsh_gso_segment(), llama a skb_mac_gso_segment() para invocar los controladores GSO del protocolo interno. nsh_gso_segment() hace lo siguiente para el skb original antes de llamar a skb_mac_gso_segment() 1. restablecer skb-\u0026gt;network_header 2. guardar el skb-\u0026gt;{mac_heaeder,mac_len} original en una variable local 3. extraer el encabezado NSH 4. restablece skb- \u0026gt;mac_header 5. Configure skb-\u0026gt;mac_len y skb-\u0026gt;protocol para el protocolo interno. y hace lo siguiente para el skb segmentado 6. configurar ntohs(ETH_P_NSH) en skb-\u0026gt;protocol 7. empujar el encabezado NSH 8. restaurar skb-\u0026gt;mac_header 9. configurar skb-\u0026gt;mac_header + mac_len en skb-\u0026gt;network_header 10. restaurar skb-\u0026gt;mac_len Hay dos problemas en 6-7 y 8-9. (a) Despu\u00e9s de 6 y 7, skb-\u0026gt;data apunta al encabezado NSH, por lo que el encabezado externo (ETH_P_8021AD en este caso) se elimina cuando skb se env\u00eda fuera de netdev. Adem\u00e1s, si NSH est\u00e1 encapsulado por NSH + Ethernet (es decir, NSH-Ethernet-NSH), skb_pull() en el primer nsh_gso_segment() har\u00e1 que skb-\u0026gt;data apunte al medio del encabezado NSH o Ethernet externo porque el encabezado Ethernet es no arrastrado por el segundo nsh_gso_segment(). (b) Al restaurar skb-\u0026gt;{mac_header,network_header} en 8 y 9, nsh_gso_segment() no supone que los datos en el b\u00fafer lineal se hayan desplazado. Sin embargo, udp6_ufo_fragment() podr\u00eda cambiar los datos y cambiar skb-\u0026gt;mac_header en consecuencia, como lo demuestra syzbot. Si esto sucede, incluso el skb-\u0026gt;mac_header restaurado apunta al centro del encabezado externo. Parece que nsh_gso_segment() nunca ha funcionado con encabezados externos hasta ahora. Al final de nsh_gso_segment(), se debe restaurar el encabezado externo para el skb segmentado, en lugar del encabezado NSH. Para hacer eso, calculemos la posici\u00f3n del encabezado externo relativamente desde el encabezado interno y configuremos skb-\u0026gt;{data,mac_header,protocol} correctamente. [0]: ERROR: KMSAN: valor uninit en ipvlan_process_outbound drivers/net/ipvlan/ipvlan_core.c:524 [en l\u00ednea] ERROR: KMSAN: valor uninit en ipvlan_xmit_mode_l3 drivers/net/ipvlan/ipvlan_core.c:602 [en l\u00ednea] ERROR: KMSAN: valor uninit en ipvlan_queue_xmit+0xf44/0x16b0 drivers/net/ipvlan/ipvlan_core.c:668 ipvlan_process_outbound drivers/net/ipvlan/ipvlan_core.c:524 [en l\u00ednea] ipvlan_xmit_mode_l3 drivers/net/ipvlan/ipvlan_core.c: 602 [en l\u00ednea] ipvlan_queue_xmit+0xf44/0x16b0 drivers/net/ipvlan/ipvlan_core.c:668 ipvlan_start_xmit+0x5c/0x1a0 drivers/net/ipvlan/ipvlan_main.c:222 __netdev_start_xmit include/linux/netdevice.h:4989 [en l\u00ednea] _xmitir include/linux/netdevice.h:5003 [en l\u00ednea] xmit_one net/core/dev.c:3547 [en l\u00ednea] dev_hard_start_xmit+0x244/0xa10 net/core/dev.c:3563 __dev_queue_xmit+0x33ed/0x51c0 net/core/dev. c:4351 dev_queue_xmit include/linux/netdevice.h:3171 [en l\u00ednea] paquete_xmit+0x9c/0x6b0 net/packet/af_packet.c:276 paquete_snd net/packet/af_packet.c:3081 [en l\u00ednea] paquete_sendmsg+0x8aef/0x9f10 net/ paquete/af_packet.c:3113 sock_sendmsg_nosec net/socket.c:730 [en l\u00ednea] __sock_sendmsg net/socket.c:745 [en l\u00ednea] __sys_sendto+0x735/0xa10 net/socket.c:2191 __do_sys_sendto net/socket.c:2203 [ en l\u00ednea] __se_sys_sendto net/socket.c:2199 [en l\u00ednea] __x64_sys_sendto+0x125/0x1c0 net/socket.c:2199 do_syscall_x64 arch/x86/entry/common.c:52 [en l\u00ednea] do_syscall_64+0xcf/0x1e0 arch/x86/entry /common.c:83 Entry_SYSCALL_64_after_hwframe+0x63/0x6b Uninit se cre\u00f3 en: slab_post_alloc_hook mm/slub.c:3819 [en l\u00ednea] slab_alloc_node mm/slub.c:3860 [en l\u00ednea] __do_kmalloc_node mm/slub.c:3980---truncado---\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/29a07f2ee4d273760c2acbfc756e29eccd82470a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/37ed6f244ec5bda2e90b085084e322ea55d0aaa2\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/46134031c20fd313d03b90169d64b2e05ca6b65c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/4b911a9690d72641879ea6d13cce1de31d346d79\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/5a4603fbc285752d19e4b415466db18ef3617e4a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/696d18bb59727a2e0526c0802a812620be1c9340\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/a7c2c3c1caabcb4a3d6c47284c397507aaf54fe9\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/bbccf0caef2fa917d6d0692385a06ce3c262a216\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://lists.debian.org/debian-lts-announce/2024/06/msg00019.html\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://lists.debian.org/debian-lts-announce/2024/06/msg00020.html\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
}
}