CVE-2021-47099

一、漏洞信息
 漏洞编号：[CVE-2021-47099](https://nvd.nist.gov/vuln/detail/CVE-2021-47099)
 漏洞归属组件：[kernel](https://gitee.com/src-openeuler/kernel)
 漏洞归属的版本：4.19.140,4.19.194,4.19.90,5.10.0,6.1.0,6.1.14,6.1.19,6.1.5,6.1.6,6.1.8,6.4.0
 CVSS V2.0分值：
  BaseScore：0.0 Low
  Vector：CVSS：2.0/
 漏洞简述：
  In the Linux kernel, the following vulnerability has been resolved:veth: ensure skb entering GRO are not cloned.After commit d3256efd8e8b ( veth: allow enabling NAPI even without XDP ),if GRO is enabled on a veth device and TSO is disabled on the peerdevice, TCP skbs will go through the NAPI callback. If there is no XDPprogram attached, the veth code does not perform any share check, andshared/cloned skbs could enter the GRO engine.Ignat reported a BUG triggered later-on due to the above condition:[   53.970529][    C1] kernel BUG at net/core/skbuff.c:3574![   53.981755][    C1] invalid opcode: 0000 [#1] PREEMPT SMP KASAN PTI[   53.982634][    C1] CPU: 1 PID: 19 Comm: ksoftirqd/1 Not tainted 5.16.0-rc5+ #25[   53.982634][    C1] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 0.0.0 02/06/2015[   53.982634][    C1] RIP: 0010:skb_shift+0x13ef/0x23b0[   53.982634][    C1] Code: ea 03 0f b6 04 02 48 89 fa 83 e2 07 38 d07f 08 84 c0 0f 85 41 0c 00 00 41 80 7f 02 00 4d 8d b5 d0 00 00 00 0f85 74 f5 ff ff <0f> 0b 4d 8d 77 20 be 04 00 00 00 4c 89 44 24 78 4c 89f7 4c 89 8c[   53.982634][    C1] RSP: 0018:ffff8881008f7008 EFLAGS: 00010246[   53.982634][    C1] RAX: 0000000000000000 RBX: ffff8881180b4c80 RCX: 0000000000000000[   53.982634][    C1] RDX: 0000000000000002 RSI: ffff8881180b4d3c RDI: ffff88810bc9cac2[   53.982634][    C1] RBP: ffff8881008f70b8 R08: ffff8881180b4cf4 R09: ffff8881180b4cf0[   53.982634][    C1] R10: ffffed1022999e5c R11: 0000000000000002 R12: 0000000000000590[   53.982634][    C1] R13: ffff88810f940c80 R14: ffff88810f940d50 R15: ffff88810bc9cac0[   53.982634][    C1] FS:  0000000000000000(0000) GS:ffff888235880000(0000) knlGS:0000000000000000[   53.982634][    C1] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033[   53.982634][    C1] CR2: 00007ff5f9b86680 CR3: 0000000108ce8004 CR4: 0000000000170ee0[   53.982634][    C1] Call Trace:[   53.982634][    C1]  <TASK>[   53.982634][    C1]  tcp_sacktag_walk+0xaba/0x18e0[   53.982634][    C1]  tcp_sacktag_write_queue+0xe7b/0x3460[   53.982634][    C1]  tcp_ack+0x2666/0x54b0[   53.982634][    C1]  tcp_rcv_established+0x4d9/0x20f0[   53.982634][    C1]  tcp_v4_do_rcv+0x551/0x810[   53.982634][    C1]  tcp_v4_rcv+0x22ed/0x2ed0[   53.982634][    C1]  ip_protocol_deliver_rcu+0x96/0xaf0[   53.982634][    C1]  ip_local_deliver_finish+0x1e0/0x2f0[   53.982634][    C1]  ip_sublist_rcv_finish+0x211/0x440[   53.982634][    C1]  ip_list_rcv_finish.constprop.0+0x424/0x660[   53.982634][    C1]  ip_list_rcv+0x2c8/0x410[   53.982634][    C1]  __netif_receive_skb_list_core+0x65c/0x910[   53.982634][    C1]  netif_receive_skb_list_internal+0x5f9/0xcb0[   53.982634][    C1]  napi_complete_done+0x188/0x6e0[   53.982634][    C1]  gro_cell_poll+0x10c/0x1d0[   53.982634][    C1]  __napi_poll+0xa1/0x530[   53.982634][    C1]  net_rx_action+0x567/0x1270[   53.982634][    C1]  __do_softirq+0x28a/0x9ba[   53.982634][    C1]  run_ksoftirqd+0x32/0x60[   53.982634][    C1]  smpboot_thread_fn+0x559/0x8c0[   53.982634][    C1]  kthread+0x3b9/0x490[   53.982634][    C1]  ret_from_fork+0x22/0x30[   53.982634][    C1]  </TASK>Address the issue by skipping the GRO stage for shared or cloned skbs.To reduce the chance of OoO, try to unclone the skbs before giving up.v1 -> v2: - use avoid skb_copy and fallback to netif_receive_skb  - Eric
 漏洞公开时间：2024-03-05 02:15:08
 漏洞创建时间：2024-03-05 02:38:32
 漏洞详情参考链接：
  https://nvd.nist.gov/vuln/detail/CVE-2021-47099
<details>
<summary>更多参考(点击展开)</summary>

| 参考来源 | 参考链接 | 来源链接 |
| ------- | -------- | -------- |
| 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | https://git.kernel.org/stable/c/9695b7de5b4760ed22132aca919570c0190cb0ce |  |
| 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | https://git.kernel.org/stable/c/d2269ae48598e05b59ec9ea9e6e44fd33941130d |  |
| suse_bugzilla | http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2021-47099 | https://bugzilla.suse.com/show_bug.cgi?id=1220955 |
| suse_bugzilla | https://www.cve.org/CVERecord?id=CVE-2021-47099 | https://bugzilla.suse.com/show_bug.cgi?id=1220955 |
| suse_bugzilla | https://git.kernel.org/stable/c/9695b7de5b4760ed22132aca919570c0190cb0ce | https://bugzilla.suse.com/show_bug.cgi?id=1220955 |
| suse_bugzilla | https://git.kernel.org/stable/c/d2269ae48598e05b59ec9ea9e6e44fd33941130d | https://bugzilla.suse.com/show_bug.cgi?id=1220955 |
| redhat_bugzilla | https://lore.kernel.org/linux-cve-announce/2024030415-CVE-2021-47099-3127@gregkh/T | https://bugzilla.redhat.com/show_bug.cgi?id=2267919 |
| ubuntu | https://git.kernel.org/linus/9695b7de5b4760ed22132aca919570c0190cb0ce (5.16-rc7) | https://ubuntu.com/security/CVE-2021-47099 |
| ubuntu | https://git.kernel.org/stable/c/d2269ae48598e05b59ec9ea9e6e44fd33941130d | https://ubuntu.com/security/CVE-2021-47099 |
| ubuntu | https://git.kernel.org/stable/c/9695b7de5b4760ed22132aca919570c0190cb0ce | https://ubuntu.com/security/CVE-2021-47099 |
| ubuntu | https://www.cve.org/CVERecord?id=CVE-2021-47099 | https://ubuntu.com/security/CVE-2021-47099 |
| ubuntu | https://nvd.nist.gov/vuln/detail/CVE-2021-47099 | https://ubuntu.com/security/CVE-2021-47099 |
| ubuntu | https://launchpad.net/bugs/cve/CVE-2021-47099 | https://ubuntu.com/security/CVE-2021-47099 |
| ubuntu | https://security-tracker.debian.org/tracker/CVE-2021-47099 | https://ubuntu.com/security/CVE-2021-47099 |
| cve_search |  | https://git.kernel.org/stable/c/d2269ae48598e05b59ec9ea9e6e44fd33941130d |
| cve_search |  | https://git.kernel.org/stable/c/9695b7de5b4760ed22132aca919570c0190cb0ce |
| ubuntu | https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-47099 | https://ubuntu.com/security/CVE-2021-47099 |

</details>

漏洞分析指导链接：
  https://gitee.com/openeuler/cve-manager/blob/master/cve-vulner-manager/doc/md/manual.md
 漏洞数据来源:
  openBrain开源漏洞感知系统
 漏洞补丁信息：
  <details>
<summary>详情(点击展开)</summary>

| 影响的包 | 修复版本 | 修复补丁 | 问题引入补丁 | 来源  |
| ------- | -------- | ------- | -------- | --------- |
| linux |  | https://git.kernel.org/linus/9695b7de5b4760ed22132aca919570c0190cb0ce | https://git.kernel.org/linus/d3256efd8e8b234a6251e4d4580bd2c3c31fdc4c | ubuntu |

</details>

二、漏洞分析结构反馈
 影响性分析说明：
  In the Linux kernel, the following vulnerability has been resolved:veth: ensure skb entering GRO are not cloned.After commit d3256efd8e8b ( veth: allow enabling NAPI even without XDP ),if GRO is enabled on a veth device and TSO is disabled on the peerdevice, TCP skbs will go through the NAPI callback. If there is no XDPprogram attached, the veth code does not perform any share check, andshared/cloned skbs could enter the GRO engine.Ignat reported a BUG triggered later-on due to the above condition:[   53.970529][    C1] kernel BUG at net/core/skbuff.c:3574![   53.981755][    C1] invalid opcode: 0000 [#1] PREEMPT SMP KASAN PTI[   53.982634][    C1] CPU: 1 PID: 19 Comm: ksoftirqd/1 Not tainted 5.16.0-rc5+ #25[   53.982634][    C1] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 0.0.0 02/06/2015[   53.982634][    C1] RIP: 0010:skb_shift+0x13ef/0x23b0[   53.982634][    C1] Code: ea 03 0f b6 04 02 48 89 fa 83 e2 07 38 d07f 08 84 c0 0f 85 41 0c 00 00 41 80 7f 02 00 4d 8d b5 d0 00 00 00 0f85 74 f5 ff ff <0f> 0b 4d 8d 77 20 be 04 00 00 00 4c 89 44 24 78 4c 89f7 4c 89 8c[   53.982634][    C1] RSP: 0018:ffff8881008f7008 EFLAGS: 00010246[   53.982634][    C1] RAX: 0000000000000000 RBX: ffff8881180b4c80 RCX: 0000000000000000[   53.982634][    C1] RDX: 0000000000000002 RSI: ffff8881180b4d3c RDI: ffff88810bc9cac2[   53.982634][    C1] RBP: ffff8881008f70b8 R08: ffff8881180b4cf4 R09: ffff8881180b4cf0[   53.982634][    C1] R10: ffffed1022999e5c R11: 0000000000000002 R12: 0000000000000590[   53.982634][    C1] R13: ffff88810f940c80 R14: ffff88810f940d50 R15: ffff88810bc9cac0[   53.982634][    C1] FS:  0000000000000000(0000) GS:ffff888235880000(0000) knlGS:0000000000000000[   53.982634][    C1] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033[   53.982634][    C1] CR2: 00007ff5f9b86680 CR3: 0000000108ce8004 CR4: 0000000000170ee0[   53.982634][    C1] Call Trace:[   53.982634][    C1]  <TASK>[   53.982634][    C1]  tcp_sacktag_walk+0xaba/0x18e0[   53.982634][    C1]  tcp_sacktag_write_queue+0xe7b/0x3460[   53.982634][    C1]  tcp_ack+0x2666/0x54b0[   53.982634][    C1]  tcp_rcv_established+0x4d9/0x20f0[   53.982634][    C1]  tcp_v4_do_rcv+0x551/0x810[   53.982634][    C1]  tcp_v4_rcv+0x22ed/0x2ed0[   53.982634][    C1]  ip_protocol_deliver_rcu+0x96/0xaf0[   53.982634][    C1]  ip_local_deliver_finish+0x1e0/0x2f0[   53.982634][    C1]  ip_sublist_rcv_finish+0x211/0x440[   53.982634][    C1]  ip_list_rcv_finish.constprop.0+0x424/0x660[   53.982634][    C1]  ip_list_rcv+0x2c8/0x410[   53.982634][    C1]  __netif_receive_skb_list_core+0x65c/0x910[   53.982634][    C1]  netif_receive_skb_list_internal+0x5f9/0xcb0[   53.982634][    C1]  napi_complete_done+0x188/0x6e0[   53.982634][    C1]  gro_cell_poll+0x10c/0x1d0[   53.982634][    C1]  __napi_poll+0xa1/0x530[   53.982634][    C1]  net_rx_action+0x567/0x1270[   53.982634][    C1]  __do_softirq+0x28a/0x9ba[   53.982634][    C1]  run_ksoftirqd+0x32/0x60[   53.982634][    C1]  smpboot_thread_fn+0x559/0x8c0[   53.982634][    C1]  kthread+0x3b9/0x490[   53.982634][    C1]  ret_from_fork+0x22/0x30[   53.982634][    C1]  </TASK>Address the issue by skipping the GRO stage for shared or cloned skbs.To reduce the chance of OoO, try to unclone the skbs before giving up.v1 -> v2: - use avoid skb_copy and fallback to netif_receive_skb  - Eric
 openEuler评分：
  5.5
 Vector：CVSS：3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
 受影响版本排查(受影响/不受影响)：
  1.openEuler-20.03-LTS-SP1(4.19.90):不受影响
2.openEuler-20.03-LTS-SP4(4.19.90):不受影响
3.openEuler-22.03-LTS(5.10.0):不受影响
4.openEuler-22.03-LTS-SP1(5.10.0):不受影响
5.openEuler-22.03-LTS-SP2(5.10.0):不受影响
6.openEuler-22.03-LTS-SP3(5.10.0):不受影响
7.master(6.1.0):不受影响
8.openEuler-22.03-LTS-Next(5.10.0):不受影响
9.openEuler-24.03-LTS:不受影响
10.openEuler-24.03-LTS-Next:不受影响

修复是否涉及abi变化(是/否)：
  1.openEuler-20.03-LTS-SP1(4.19.90):否
2.openEuler-20.03-LTS-SP4(4.19.90):否
3.openEuler-22.03-LTS(5.10.0):否
4.openEuler-22.03-LTS-SP1(5.10.0):否
5.openEuler-22.03-LTS-SP2(5.10.0):否
6.openEuler-22.03-LTS-SP3(5.10.0):否
7.master(6.1.0):否
8.openEuler-22.03-LTS-Next(5.10.0):否
9.openEuler-24.03-LTS:否
10.openEuler-24.03-LTS-Next:否

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