CVE-2021-47408

一、漏洞信息
 漏洞编号：[CVE-2021-47408](https://nvd.nist.gov/vuln/detail/CVE-2021-47408)
 漏洞归属组件：[kernel](https://gitee.com/src-openeuler/kernel)
 漏洞归属的版本：4.19.140,4.19.194,4.19.90,5.10.0,6.1.0,6.1.14,6.1.19,6.1.5,6.1.6,6.1.8,6.4.0,6.6.0
 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:netfilter: conntrack: serialize hash resizes and cleanupsSyzbot was able to trigger the following warning [1]No repro found by syzbot yet but I was able to trigger similar issueby having 2 scripts running in parallel, changing conntrack hash sizes,and:for j in `seq 1 1000` ; do unshare -n /bin/true >/dev/null ; doneIt would take more than 5 minutes for net_namespace structuresto be cleaned up.This is because nf_ct_iterate_cleanup() has to restart everytimea resize happened.By adding a mutex, we can serialize hash resizes and cleanupsand also make get_next_corpse() faster by skipping over emptybuckets.Even without resizes in the picture, this patch considerablyspeeds up network namespace dismantles.[1]INFO: task syz-executor.0:8312 can t die for more than 144 seconds.task:syz-executor.0  state:R  running task     stack:25672 pid: 8312 ppid:  6573 flags:0x00004006Call Trace: context_switch kernel/sched/core.c:4955 [inline] __schedule+0x940/0x26f0 kernel/sched/core.c:6236 preempt_schedule_common+0x45/0xc0 kernel/sched/core.c:6408 preempt_schedule_thunk+0x16/0x18 arch/x86/entry/thunk_64.S:35 __local_bh_enable_ip+0x109/0x120 kernel/softirq.c:390 local_bh_enable include/linux/bottom_half.h:32 [inline] get_next_corpse net/netfilter/nf_conntrack_core.c:2252 [inline] nf_ct_iterate_cleanup+0x15a/0x450 net/netfilter/nf_conntrack_core.c:2275 nf_conntrack_cleanup_net_list+0x14c/0x4f0 net/netfilter/nf_conntrack_core.c:2469 ops_exit_list+0x10d/0x160 net/core/net_namespace.c:171 setup_net+0x639/0xa30 net/core/net_namespace.c:349 copy_net_ns+0x319/0x760 net/core/net_namespace.c:470 create_new_namespaces+0x3f6/0xb20 kernel/nsproxy.c:110 unshare_nsproxy_namespaces+0xc1/0x1f0 kernel/nsproxy.c:226 ksys_unshare+0x445/0x920 kernel/fork.c:3128 __do_sys_unshare kernel/fork.c:3202 [inline] __se_sys_unshare kernel/fork.c:3200 [inline] __x64_sys_unshare+0x2d/0x40 kernel/fork.c:3200 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+0x44/0xaeRIP: 0033:0x7f63da68e739RSP: 002b:00007f63d7c05188 EFLAGS: 00000246 ORIG_RAX: 0000000000000110RAX: ffffffffffffffda RBX: 00007f63da792f80 RCX: 00007f63da68e739RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000040000000RBP: 00007f63da6e8cc4 R08: 0000000000000000 R09: 0000000000000000R10: 0000000000000000 R11: 0000000000000246 R12: 00007f63da792f80R13: 00007fff50b75d3f R14: 00007f63d7c05300 R15: 0000000000022000Showing all locks held in the system:1 lock held by khungtaskd/27: #0: ffffffff8b980020 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:64462 locks held by kworker/u4:2/153: #0: ffff888010c69138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] #0: ffff888010c69138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: arch_atomic_long_set include/linux/atomic/atomic-long.h:41 [inline] #0: ffff888010c69138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: atomic_long_set include/linux/atomic/atomic-instrumented.h:1198 [inline] #0: ffff888010c69138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:634 [inline] #0: ffff888010c69138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:661 [inline] #0: ffff888010c69138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x896/0x1690 kernel/workqueue.c:2268 #1: ffffc9000140fdb0 ((kfence_timer).work){+.+.}-{0:0}, at: process_one_work+0x8ca/0x1690 kernel/workqueue.c:22721 lock held by systemd-udevd/2970:1 lock held by in:imklog/6258: #0: ffff88807f970ff0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:9903 locks held by kworker/1:6/8158:1 lock held by syz-executor.0/8312:2 locks held by kworker/u4:13/9320:1 lock held by---truncated---
 漏洞公开时间：2024-05-21 23:15:26
 漏洞创建时间：2024-05-22 03:27:29
 漏洞详情参考链接：
  https://nvd.nist.gov/vuln/detail/CVE-2021-47408
<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/7ea6f5848281182ce0cff6cafdcf3fbdeb8ca7e1 |  |
| 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | https://git.kernel.org/stable/c/e2d192301a0df8160d1555b66ae8611e8050e424 |  |
| 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | https://git.kernel.org/stable/c/e9edc188fc76499b0b9bd60364084037f6d03773 |  |
| suse_bugzilla | http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2021-47408 | https://bugzilla.suse.com/show_bug.cgi?id=1225236 |
| suse_bugzilla | https://www.cve.org/CVERecord?id=CVE-2021-47408 | https://bugzilla.suse.com/show_bug.cgi?id=1225236 |
| suse_bugzilla | https://git.kernel.org/stable/c/7ea6f5848281182ce0cff6cafdcf3fbdeb8ca7e1 | https://bugzilla.suse.com/show_bug.cgi?id=1225236 |
| suse_bugzilla | https://git.kernel.org/stable/c/e2d192301a0df8160d1555b66ae8611e8050e424 | https://bugzilla.suse.com/show_bug.cgi?id=1225236 |
| suse_bugzilla | https://git.kernel.org/stable/c/e9edc188fc76499b0b9bd60364084037f6d03773 | https://bugzilla.suse.com/show_bug.cgi?id=1225236 |
| suse_bugzilla | https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2021/CVE-2021-47408.mbox | https://bugzilla.suse.com/show_bug.cgi?id=1225236 |
| suse_bugzilla | https://bugzilla.redhat.com/show_bug.cgi?id=2282328 | https://bugzilla.suse.com/show_bug.cgi?id=1225236 |
| redhat_bugzilla | https://lore.kernel.org/linux-cve-announce/2024052151-CVE-2021-47408-ad88@gregkh/T | https://bugzilla.redhat.com/show_bug.cgi?id=2282328 |
| ubuntu | https://www.cve.org/CVERecord?id=CVE-2021-47408 | https://ubuntu.com/security/CVE-2021-47408 |
| ubuntu | https://git.kernel.org/linus/e9edc188fc76499b0b9bd60364084037f6d03773 (5.15-rc4) | https://ubuntu.com/security/CVE-2021-47408 |
| ubuntu | https://git.kernel.org/stable/c/e2d192301a0df8160d1555b66ae8611e8050e424 | https://ubuntu.com/security/CVE-2021-47408 |
| ubuntu | https://git.kernel.org/stable/c/7ea6f5848281182ce0cff6cafdcf3fbdeb8ca7e1 | https://ubuntu.com/security/CVE-2021-47408 |
| ubuntu | https://git.kernel.org/stable/c/e9edc188fc76499b0b9bd60364084037f6d03773 | https://ubuntu.com/security/CVE-2021-47408 |
| ubuntu | https://nvd.nist.gov/vuln/detail/CVE-2021-47408 | https://ubuntu.com/security/CVE-2021-47408 |
| ubuntu | https://launchpad.net/bugs/cve/CVE-2021-47408 | https://ubuntu.com/security/CVE-2021-47408 |
| ubuntu | https://security-tracker.debian.org/tracker/CVE-2021-47408 | https://ubuntu.com/security/CVE-2021-47408 |

</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/e9edc188fc76499b0b9bd60364084037f6d03773 | https://git.kernel.org/linus/1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 | 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:netfilter: conntrack: serialize hash resizes and cleanupsSyzbot was able to trigger the following warning [1]No repro found by syzbot yet but I was able to trigger similar issueby having 2 scripts running in parallel, changing conntrack hash sizes,and:for j in `seq 1 1000` ; do unshare -n /bin/true >/dev/null ; doneIt would take more than 5 minutes for net_namespace structuresto be cleaned up.This is because nf_ct_iterate_cleanup() has to restart everytimea resize happened.By adding a mutex, we can serialize hash resizes and cleanupsand also make get_next_corpse() faster by skipping over emptybuckets.Even without resizes in the picture, this patch considerablyspeeds up network namespace dismantles.[1]INFO: task syz-executor.0:8312 can t die for more than 144 seconds.task:syz-executor.0  state:R  running task     stack:25672 pid: 8312 ppid:  6573 flags:0x00004006Call Trace: context_switch kernel/sched/core.c:4955 [inline] __schedule+0x940/0x26f0 kernel/sched/core.c:6236 preempt_schedule_common+0x45/0xc0 kernel/sched/core.c:6408 preempt_schedule_thunk+0x16/0x18 arch/x86/entry/thunk_64.S:35 __local_bh_enable_ip+0x109/0x120 kernel/softirq.c:390 local_bh_enable include/linux/bottom_half.h:32 [inline] get_next_corpse net/netfilter/nf_conntrack_core.c:2252 [inline] nf_ct_iterate_cleanup+0x15a/0x450 net/netfilter/nf_conntrack_core.c:2275 nf_conntrack_cleanup_net_list+0x14c/0x4f0 net/netfilter/nf_conntrack_core.c:2469 ops_exit_list+0x10d/0x160 net/core/net_namespace.c:171 setup_net+0x639/0xa30 net/core/net_namespace.c:349 copy_net_ns+0x319/0x760 net/core/net_namespace.c:470 create_new_namespaces+0x3f6/0xb20 kernel/nsproxy.c:110 unshare_nsproxy_namespaces+0xc1/0x1f0 kernel/nsproxy.c:226 ksys_unshare+0x445/0x920 kernel/fork.c:3128 __do_sys_unshare kernel/fork.c:3202 [inline] __se_sys_unshare kernel/fork.c:3200 [inline] __x64_sys_unshare+0x2d/0x40 kernel/fork.c:3200 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+0x44/0xaeRIP: 0033:0x7f63da68e739RSP: 002b:00007f63d7c05188 EFLAGS: 00000246 ORIG_RAX: 0000000000000110RAX: ffffffffffffffda RBX: 00007f63da792f80 RCX: 00007f63da68e739RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000040000000RBP: 00007f63da6e8cc4 R08: 0000000000000000 R09: 0000000000000000R10: 0000000000000000 R11: 0000000000000246 R12: 00007f63da792f80R13: 00007fff50b75d3f R14: 00007f63d7c05300 R15: 0000000000022000Showing all locks held in the system:1 lock held by khungtaskd/27: #0: ffffffff8b980020 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:64462 locks held by kworker/u4:2/153: #0: ffff888010c69138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] #0: ffff888010c69138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: arch_atomic_long_set include/linux/atomic/atomic-long.h:41 [inline] #0: ffff888010c69138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: atomic_long_set include/linux/atomic/atomic-instrumented.h:1198 [inline] #0: ffff888010c69138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:634 [inline] #0: ffff888010c69138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:661 [inline] #0: ffff888010c69138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x896/0x1690 kernel/workqueue.c:2268 #1: ffffc9000140fdb0 ((kfence_timer).work){+.+.}-{0:0}, at: process_one_work+0x8ca/0x1690 kernel/workqueue.c:22721 lock held by systemd-udevd/2970:1 lock held by in:imklog/6258: #0: ffff88807f970ff0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:9903 locks held by kworker/1:6/8158:1 lock held by syz-executor.0/8312:2 locks held by kworker/u4:13/9320:1 lock held by---truncated---       
 openEuler评分：
  5.5
 Vector：CVSS：2.0/AV:L/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:N
 受影响版本排查(受影响/不受影响)：
  1.openEuler-20.03-LTS-SP1(4.19.90):受影响
2.openEuler-20.03-LTS-SP4(4.19.90):受影响
3.openEuler-22.03-LTS(5.10.0):受影响
4.openEuler-22.03-LTS-SP1(5.10.0):受影响
5.openEuler-22.03-LTS-SP2(5.10.0):受影响
6.openEuler-22.03-LTS-SP3(5.10.0):受影响
7.openEuler-22.03-LTS-SP4(5.10.0):不受影响
8.master(6.1.0):不受影响
9.openEuler-22.03-LTS-Next(5.10.0):不受影响
10.openEuler-24.03-LTS(6.6.0):不受影响
11.openEuler-24.03-LTS-Next(6.6.0):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(6.6.0):否
10.openEuler-24.03-LTS-Next(6.6.0):否
11.openEuler-22.03-LTS-SP4(5.10.0):否

三、漏洞修复
安全公告链接：https://www.openeuler.org/zh/security/safety-bulletin/detail/?id=openEuler-SA-2024-1692

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