CVE-2022-48644

一、漏洞信息
 漏洞编号：[CVE-2022-48644](https://nvd.nist.gov/vuln/detail/CVE-2022-48644)
 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 Medium
  Vector：CVSS：2.0/
 漏洞简述：
  In the Linux kernel, the following vulnerability has been resolved:net/sched: taprio: avoid disabling offload when it was never enabledIn an incredibly strange API design decision, qdisc->destroy() getscalled even if qdisc->init() never succeeded, not exclusively sincecommit 87b60cfacf9f ( net_sched: fix error recovery at qdisc creation ),but apparently also earlier (in the case of qdisc_create_dflt()).The taprio qdisc does not fully acknowledge this when it attempts fulloffload, because it starts off with q->flags = TAPRIO_FLAGS_INVALID intaprio_init(), then it replaces q->flags with TCA_TAPRIO_ATTR_FLAGSparsed from netlink (in taprio_change(), tail called from taprio_init()).But in taprio_destroy(), we call taprio_disable_offload(), and thisdetermines what to do based on FULL_OFFLOAD_IS_ENABLED(q->flags).But looking at the implementation of FULL_OFFLOAD_IS_ENABLED()(a bitwise check of bit 1 in q->flags), it is invalid to call this macroon q->flags when it contains TAPRIO_FLAGS_INVALID, because that is setto U32_MAX, and therefore FULL_OFFLOAD_IS_ENABLED() will return true onan invalid set of flags.As a result, it is possible to crash the kernel if user space forces anerror between setting q->flags = TAPRIO_FLAGS_INVALID, and the callingof taprio_enable_offload(). This is because drivers do not expect theoffload to be disabled when it was never enabled.The error that we force here is to attach taprio as a non-root qdisc,but instead as child of an mqprio root qdisc:$ tc qdisc add dev swp0 root handle 1:  	mqprio num_tc 8 map 0 1 2 3 4 5 6 7  	queues 1@0 1@1 1@2 1@3 1@4 1@5 1@6 1@7 hw 0$ tc qdisc replace dev swp0 parent 1:1  	taprio num_tc 8 map 0 1 2 3 4 5 6 7  	queues 1@0 1@1 1@2 1@3 1@4 1@5 1@6 1@7 base-time 0  	sched-entry S 0x7f 990000 sched-entry S 0x80 100000  	flags 0x0 clockid CLOCK_TAIUnable to handle kernel paging request at virtual address fffffffffffffff8[fffffffffffffff8] pgd=0000000000000000, p4d=0000000000000000Internal error: Oops: 96000004 [#1] PREEMPT SMPCall trace: taprio_dump+0x27c/0x310 vsc9959_port_setup_tc+0x1f4/0x460 felix_port_setup_tc+0x24/0x3c dsa_slave_setup_tc+0x54/0x27c taprio_disable_offload.isra.0+0x58/0xe0 taprio_destroy+0x80/0x104 qdisc_create+0x240/0x470 tc_modify_qdisc+0x1fc/0x6b0 rtnetlink_rcv_msg+0x12c/0x390 netlink_rcv_skb+0x5c/0x130 rtnetlink_rcv+0x1c/0x2cFix this by keeping track of the operations we made, and undo theoffload only if we actually did it.I ve added  bool offloaded  inside a 4 byte hole between  int clockid and  atomic64_t picos_per_byte . Now the first cache line looks likebelow:$ pahole -C taprio_sched net/sched/sch_taprio.ostruct taprio_sched {        struct Qdisc * *           qdiscs;               /*     0     8 */        struct Qdisc *             root;                 /*     8     8 */        u32                        flags;                /*    16     4 */        enum tk_offsets            tk_offset;            /*    20     4 */        int                        clockid;              /*    24     4 */        bool                       offloaded;            /*    28     1 */        /* XXX 3 bytes hole, try to pack */        atomic64_t                 picos_per_byte;       /*    32     0 */        /* XXX 8 bytes hole, try to pack */        spinlock_t                 current_entry_lock;   /*    40     0 */        /* XXX 8 bytes hole, try to pack */        struct sched_entry *       current_entry;        /*    48     8 */        struct sched_gate_list *   oper_sched;           /*    56     8 */        /* --- cacheline 1 boundary (64 bytes) --- */
 漏洞公开时间：2024-04-28 21:15:07
 漏洞创建时间：2024-04-28 22:59:06
 漏洞详情参考链接：
  https://nvd.nist.gov/vuln/detail/CVE-2022-48644
<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/586def6ebed195f3594a4884f7c5334d0e1ad1bb |  |
| 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | https://git.kernel.org/stable/c/c7c9c7eb305ab8b4e93e4e4e1b78d8cfcbc26323 |  |
| 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | https://git.kernel.org/stable/c/d12a1eb07003e597077329767c6aa86a7e972c76 |  |
| 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | https://git.kernel.org/stable/c/db46e3a88a09c5cf7e505664d01da7238cd56c92 |  |
| 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | https://git.kernel.org/stable/c/f58e43184226e5e9662088ccf1389e424a3a4cbd |  |
| suse_bugzilla | http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2022-48644 | https://bugzilla.suse.com/show_bug.cgi?id=1223511 |
| suse_bugzilla | https://www.cve.org/CVERecord?id=CVE-2022-48644 | https://bugzilla.suse.com/show_bug.cgi?id=1223511 |
| suse_bugzilla | https://git.kernel.org/stable/c/586def6ebed195f3594a4884f7c5334d0e1ad1bb | https://bugzilla.suse.com/show_bug.cgi?id=1223511 |
| suse_bugzilla | https://git.kernel.org/stable/c/c7c9c7eb305ab8b4e93e4e4e1b78d8cfcbc26323 | https://bugzilla.suse.com/show_bug.cgi?id=1223511 |
| suse_bugzilla | https://git.kernel.org/stable/c/d12a1eb07003e597077329767c6aa86a7e972c76 | https://bugzilla.suse.com/show_bug.cgi?id=1223511 |
| suse_bugzilla | https://git.kernel.org/stable/c/db46e3a88a09c5cf7e505664d01da7238cd56c92 | https://bugzilla.suse.com/show_bug.cgi?id=1223511 |
| suse_bugzilla | https://git.kernel.org/stable/c/f58e43184226e5e9662088ccf1389e424a3a4cbd | https://bugzilla.suse.com/show_bug.cgi?id=1223511 |
| suse_bugzilla | https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2022/CVE-2022-48644.mbox | https://bugzilla.suse.com/show_bug.cgi?id=1223511 |
| redhat_bugzilla | https://lore.kernel.org/linux-cve-announce/2024042856-CVE-2022-48644-757e@gregkh/T | https://bugzilla.redhat.com/show_bug.cgi?id=2277819 |
| ubuntu | https://www.cve.org/CVERecord?id=CVE-2022-48644 | https://ubuntu.com/security/CVE-2022-48644 |
| ubuntu | https://git.kernel.org/linus/db46e3a88a09c5cf7e505664d01da7238cd56c92 (6.0-rc7) | https://ubuntu.com/security/CVE-2022-48644 |
| ubuntu | https://git.kernel.org/stable/c/d12a1eb07003e597077329767c6aa86a7e972c76 | https://ubuntu.com/security/CVE-2022-48644 |
| ubuntu | https://git.kernel.org/stable/c/586def6ebed195f3594a4884f7c5334d0e1ad1bb | https://ubuntu.com/security/CVE-2022-48644 |
| ubuntu | https://git.kernel.org/stable/c/f58e43184226e5e9662088ccf1389e424a3a4cbd | https://ubuntu.com/security/CVE-2022-48644 |
| ubuntu | https://git.kernel.org/stable/c/c7c9c7eb305ab8b4e93e4e4e1b78d8cfcbc26323 | https://ubuntu.com/security/CVE-2022-48644 |
| ubuntu | https://git.kernel.org/stable/c/db46e3a88a09c5cf7e505664d01da7238cd56c92 | https://ubuntu.com/security/CVE-2022-48644 |
| ubuntu | https://nvd.nist.gov/vuln/detail/CVE-2022-48644 | https://ubuntu.com/security/CVE-2022-48644 |
| ubuntu | https://launchpad.net/bugs/cve/CVE-2022-48644 | https://ubuntu.com/security/CVE-2022-48644 |
| ubuntu | https://security-tracker.debian.org/tracker/CVE-2022-48644 | https://ubuntu.com/security/CVE-2022-48644 |
| cve_search |  | https://git.kernel.org/stable/c/d12a1eb07003e597077329767c6aa86a7e972c76 |
| cve_search |  | https://git.kernel.org/stable/c/586def6ebed195f3594a4884f7c5334d0e1ad1bb |
| cve_search |  | https://git.kernel.org/stable/c/f58e43184226e5e9662088ccf1389e424a3a4cbd |
| cve_search |  | https://git.kernel.org/stable/c/c7c9c7eb305ab8b4e93e4e4e1b78d8cfcbc26323 |
| cve_search |  | https://git.kernel.org/stable/c/db46e3a88a09c5cf7e505664d01da7238cd56c92 |

</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/db46e3a88a09c5cf7e505664d01da7238cd56c92 | https://git.kernel.org/linus/9c66d15646760eb8982242b4531c4d4fd36118fd | ubuntu |

</details>

二、漏洞分析结构反馈
 影响性分析说明：
    Reserved. 
 openEuler评分：
  4.0
 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-22.03-LTS-SP1(5.10.0):受影响
2.openEuler-20.03-LTS-SP4(4.19.90):不受影响
3.openEuler-22.03-LTS-SP3(5.10.0):不受影响
4.openEuler-22.03-LTS-SP4(5.10.0):不受影响
5.master(6.1.0):不受影响
6.openEuler-24.03-LTS(6.6.0):不受影响
7.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-SP4(4.19.90):否
2.openEuler-22.03-LTS-SP1(5.10.0):否
3.openEuler-22.03-LTS-SP3(5.10.0):否
4.master(6.1.0):否
5.openEuler-24.03-LTS(6.6.0):否
6.openEuler-24.03-LTS-Next(6.6.0):否
7.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-2024-2080

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