CVE-2022-49443

一、漏洞信息
 漏洞编号：[CVE-2022-49443](https://nvd.nist.gov/vuln/detail/CVE-2022-49443)
 漏洞归属组件：[kernel](https://gitee.com/src-openeuler/kernel)
 漏洞归属的版本：4.19.140,4.19.194,4.19.90,5.10.0,6.1.19,6.4.0,6.6.0
 CVSS V3.0分值：
  BaseScore：4.7 Medium
  Vector：CVSS：3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
 漏洞简述：
  In the Linux kernel, the following vulnerability has been resolved:list: fix a data-race around ep->rdllistep_poll() first calls ep_events_available() with no lock held and checksif ep->rdllist is empty by list_empty_careful(), which readsrdllist->prev.  Thus all accesses to it need some protection to avoidstore/load-tearing.Note INIT_LIST_HEAD_RCU() already has the annotation for both prevand next.Commit bf3b9f6372c4 ( epoll: Add busy poll support to epoll with socketfds. ) added the first lockless ep_events_available(), and commitc5a282e9635e ( fs/epoll: reduce the scope of wq lock in epoll_wait() )made some ep_events_available() calls lockless and added single call undera lock, finally commit e59d3c64cba6 ( epoll: eliminate unnecessary lockfor zero timeout ) made the last ep_events_available() lockless.BUG: KCSAN: data-race in do_epoll_wait / do_epoll_waitwrite to 0xffff88810480c7d8 of 8 bytes by task 1802 on cpu 0: INIT_LIST_HEAD include/linux/list.h:38 [inline] list_splice_init include/linux/list.h:492 [inline] ep_start_scan fs/eventpoll.c:622 [inline] ep_send_events fs/eventpoll.c:1656 [inline] ep_poll fs/eventpoll.c:1806 [inline] do_epoll_wait+0x4eb/0xf40 fs/eventpoll.c:2234 do_epoll_pwait fs/eventpoll.c:2268 [inline] __do_sys_epoll_pwait fs/eventpoll.c:2281 [inline] __se_sys_epoll_pwait+0x12b/0x240 fs/eventpoll.c:2275 __x64_sys_epoll_pwait+0x74/0x80 fs/eventpoll.c:2275 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xaeread to 0xffff88810480c7d8 of 8 bytes by task 1799 on cpu 1: list_empty_careful include/linux/list.h:329 [inline] ep_events_available fs/eventpoll.c:381 [inline] ep_poll fs/eventpoll.c:1797 [inline] do_epoll_wait+0x279/0xf40 fs/eventpoll.c:2234 do_epoll_pwait fs/eventpoll.c:2268 [inline] __do_sys_epoll_pwait fs/eventpoll.c:2281 [inline] __se_sys_epoll_pwait+0x12b/0x240 fs/eventpoll.c:2275 __x64_sys_epoll_pwait+0x74/0x80 fs/eventpoll.c:2275 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xaevalue changed: 0xffff88810480c7d0 -> 0xffff888103c15098Reported by Kernel Concurrency Sanitizer on:CPU: 1 PID: 1799 Comm: syz-fuzzer Tainted: G        W         5.17.0-rc7-syzkaller-dirty #0Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 漏洞公开时间：2025-02-26 15:01:20
 漏洞创建时间：2025-02-26 18:04:21
 漏洞详情参考链接：
  https://nvd.nist.gov/vuln/detail/CVE-2022-49443
<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/5d5d993f16be15d124be7b8ec71b28ef7b7dc3af |  |
| 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | https://git.kernel.org/stable/c/cb3e48f7a35033deb9455abe3932e63cb500b9eb |  |
| 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | https://git.kernel.org/stable/c/d679ae94fdd5d3ab00c35078f5af5f37e068b03d |  |
| 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | https://git.kernel.org/stable/c/e039c0b5985999b150594126225e1ee51df7b4c9 |  |
| suse_bugzilla | http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2022-49443 | https://bugzilla.suse.com/show_bug.cgi?id=1238434 |
| suse_bugzilla | https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2022/CVE-2022-49443.mbox | https://bugzilla.suse.com/show_bug.cgi?id=1238434 |
| suse_bugzilla | https://git.kernel.org/stable/c/5d5d993f16be15d124be7b8ec71b28ef7b7dc3af | https://bugzilla.suse.com/show_bug.cgi?id=1238434 |
| suse_bugzilla | https://git.kernel.org/stable/c/cb3e48f7a35033deb9455abe3932e63cb500b9eb | https://bugzilla.suse.com/show_bug.cgi?id=1238434 |
| suse_bugzilla | https://git.kernel.org/stable/c/e039c0b5985999b150594126225e1ee51df7b4c9 | https://bugzilla.suse.com/show_bug.cgi?id=1238434 |
| suse_bugzilla | https://git.kernel.org/stable/c/d679ae94fdd5d3ab00c35078f5af5f37e068b03d | https://bugzilla.suse.com/show_bug.cgi?id=1238434 |
| suse_bugzilla | https://bugzilla.redhat.com/show_bug.cgi?id=2348240 | https://bugzilla.suse.com/show_bug.cgi?id=1238434 |
| anolis |  | https://anas.openanolis.cn/cves/detail/CVE-2022-49443 |

</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  |
| ------- | -------- | ------- | -------- | --------- |
|  |  | https://git.kernel.org/stable/c/5d5d993f16be15d124be7b8ec71b28ef7b7dc3af |  | nvd |
|  |  | https://git.kernel.org/stable/c/cb3e48f7a35033deb9455abe3932e63cb500b9eb |  | nvd |
|  |  | https://git.kernel.org/stable/c/d679ae94fdd5d3ab00c35078f5af5f37e068b03d |  | nvd |
|  |  | https://git.kernel.org/stable/c/e039c0b5985999b150594126225e1ee51df7b4c9 |  | nvd |

</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:list: fix a data-race around ep->rdllistep_poll() first calls ep_events_available() with no lock held and checksif ep->rdllist is empty by list_empty_careful(), which readsrdllist->prev.  Thus all accesses to it need some protection to avoidstore/load-tearing.Note INIT_LIST_HEAD_RCU() already has the annotation for both prevand next.Commit bf3b9f6372c4 ( epoll: Add busy poll support to epoll with socketfds. ) added the first lockless ep_events_available(), and commitc5a282e9635e ( fs/epoll: reduce the scope of wq lock in epoll_wait() )made some ep_events_available() calls lockless and added single call undera lock, finally commit e59d3c64cba6 ( epoll: eliminate unnecessary lockfor zero timeout ) made the last ep_events_available() lockless.BUG: KCSAN: data-race in do_epoll_wait / do_epoll_waitwrite to 0xffff88810480c7d8 of 8 bytes by task 1802 on cpu 0: INIT_LIST_HEAD include/linux/list.h:38 [inline] list_splice_init include/linux/list.h:492 [inline] ep_start_scan fs/eventpoll.c:622 [inline] ep_send_events fs/eventpoll.c:1656 [inline] ep_poll fs/eventpoll.c:1806 [inline] do_epoll_wait+0x4eb/0xf40 fs/eventpoll.c:2234 do_epoll_pwait fs/eventpoll.c:2268 [inline] __do_sys_epoll_pwait fs/eventpoll.c:2281 [inline] __se_sys_epoll_pwait+0x12b/0x240 fs/eventpoll.c:2275 __x64_sys_epoll_pwait+0x74/0x80 fs/eventpoll.c:2275 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xaeread to 0xffff88810480c7d8 of 8 bytes by task 1799 on cpu 1: list_empty_careful include/linux/list.h:329 [inline] ep_events_available fs/eventpoll.c:381 [inline] ep_poll fs/eventpoll.c:1797 [inline] do_epoll_wait+0x279/0xf40 fs/eventpoll.c:2234 do_epoll_pwait fs/eventpoll.c:2268 [inline] __do_sys_epoll_pwait fs/eventpoll.c:2281 [inline] __se_sys_epoll_pwait+0x12b/0x240 fs/eventpoll.c:2275 __x64_sys_epoll_pwait+0x74/0x80 fs/eventpoll.c:2275 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xaevalue changed: 0xffff88810480c7d0 -> 0xffff888103c15098Reported by Kernel Concurrency Sanitizer on:CPU: 1 PID: 1799 Comm: syz-fuzzer Tainted: G        W         5.17.0-rc7-syzkaller-dirty #0Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 openEuler评分：
  4.7
 Vector：CVSS：3.0/AV:L/AC:H/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-SP4(4.19.90):受影响
2.openEuler-22.03-LTS-SP3(5.10.0):受影响
3.openEuler-22.03-LTS-SP4(5.10.0):受影响
4.master(6.6.0):不受影响
5.openEuler-24.03-LTS(6.6.0):不受影响
6.openEuler-24.03-LTS-Next(6.6.0):不受影响
7.openEuler-24.03-LTS-SP1(6.6.0):不受影响

修复是否涉及abi变化(是/否)：
  1.openEuler-20.03-LTS-SP4(4.19.90):否
2.openEuler-22.03-LTS-SP3(5.10.0):否
3.master(6.6.0):否
4.openEuler-24.03-LTS(6.6.0):否
5.openEuler-24.03-LTS-Next(6.6.0):否
6.openEuler-22.03-LTS-SP4(5.10.0):否
7.openEuler-24.03-LTS-SP1(6.6.0):否

原因说明：
  1.openEuler-20.03-LTS-SP4(4.19.90):不修复-超出修复范围
2.openEuler-22.03-LTS-SP3(5.10.0):不修复-超出修复范围
3.openEuler-22.03-LTS-SP4(5.10.0):不修复-超出修复范围
4.master(6.6.0):不受影响-漏洞代码不能被攻击者触发
5.openEuler-24.03-LTS-Next(6.6.0):不受影响-漏洞代码不能被攻击者触发
6.openEuler-24.03-LTS(6.6.0):不受影响-漏洞代码不存在
7.openEuler-24.03-LTS-SP1(6.6.0):不受影响-漏洞代码不存在

三、漏洞修复
安全公告链接：https://www.openeuler.org/zh/security/safety-bulletin/detail/?id=openEuler-SA-2025-1410

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