CVE-2024-45000

一、漏洞信息
 漏洞编号：[CVE-2024-45000](https://nvd.nist.gov/vuln/detail/CVE-2024-45000)
 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 V3.0分值：
  BaseScore：5.5 Medium
  Vector：CVSS：3.0/AV:L/AC:L/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:fs/netfs/fscache_cookie: add missing  n_accesses  checkThis fixes a NULL pointer dereference bug due to a data race whichlooks like this:  BUG: kernel NULL pointer dereference, address: 0000000000000008  #PF: supervisor read access in kernel mode  #PF: error_code(0x0000) - not-present page  PGD 0 P4D 0  Oops: 0000 [#1] SMP PTI  CPU: 33 PID: 16573 Comm: kworker/u97:799 Not tainted 6.8.7-cm4all1-hp+ #43  Hardware name: HP ProLiant DL380 Gen9/ProLiant DL380 Gen9, BIOS P89 10/17/2018  Workqueue: events_unbound netfs_rreq_write_to_cache_work  RIP: 0010:cachefiles_prepare_write+0x30/0xa0  Code: 57 41 56 45 89 ce 41 55 49 89 cd 41 54 49 89 d4 55 53 48 89 fb 48 83 ec 08 48 8b 47 08 48 83 7f 10 00 48 89 34 24 48 8b 68 20 <48> 8b 45 08 4c 8b 38 74 45 49 8b 7f 50 e8 4e a9 b0 ff 48 8b 73 10  RSP: 0018:ffffb4e78113bde0 EFLAGS: 00010286  RAX: ffff976126be6d10 RBX: ffff97615cdb8438 RCX: 0000000000020000  RDX: ffff97605e6c4c68 RSI: ffff97605e6c4c60 RDI: ffff97615cdb8438  RBP: 0000000000000000 R08: 0000000000278333 R09: 0000000000000001  R10: ffff97605e6c4600 R11: 0000000000000001 R12: ffff97605e6c4c68  R13: 0000000000020000 R14: 0000000000000001 R15: ffff976064fe2c00  FS:  0000000000000000(0000) GS:ffff9776dfd40000(0000) knlGS:0000000000000000  CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033  CR2: 0000000000000008 CR3: 000000005942c002 CR4: 00000000001706f0  Call Trace:   <TASK>   ? __die+0x1f/0x70   ? page_fault_oops+0x15d/0x440   ? search_module_extables+0xe/0x40   ? fixup_exception+0x22/0x2f0   ? exc_page_fault+0x5f/0x100   ? asm_exc_page_fault+0x22/0x30   ? cachefiles_prepare_write+0x30/0xa0   netfs_rreq_write_to_cache_work+0x135/0x2e0   process_one_work+0x137/0x2c0   worker_thread+0x2e9/0x400   ? __pfx_worker_thread+0x10/0x10   kthread+0xcc/0x100   ? __pfx_kthread+0x10/0x10   ret_from_fork+0x30/0x50   ? __pfx_kthread+0x10/0x10   ret_from_fork_asm+0x1b/0x30   </TASK>  Modules linked in:  CR2: 0000000000000008  ---[ end trace 0000000000000000 ]---This happened because fscache_cookie_state_machine() was slow and wasstill running while another process invoked fscache_unuse_cookie();this led to a fscache_cookie_lru_do_one() call, setting theFSCACHE_COOKIE_DO_LRU_DISCARD flag, which was picked up byfscache_cookie_state_machine(), withdrawing the cookie viacachefiles_withdraw_cookie(), clearing cookie->cache_priv.At the same time, yet another process invokedcachefiles_prepare_write(), which found a NULL pointer in this codeline:  struct cachefiles_object *object = cachefiles_cres_object(cres);The next line crashes, obviously:  struct cachefiles_cache *cache = object->volume->cache;During cachefiles_prepare_write(), the  n_accesses  counter isnon-zero (via fscache_begin_operation()).  The cookie must not bewithdrawn until it drops to zero.The counter is checked by fscache_cookie_state_machine() beforeswitching to FSCACHE_COOKIE_STATE_RELINQUISHING andFSCACHE_COOKIE_STATE_WITHDRAWING (in  caseFSCACHE_COOKIE_STATE_FAILED ), but not forFSCACHE_COOKIE_STATE_LRU_DISCARDING ( caseFSCACHE_COOKIE_STATE_ACTIVE ).This patch adds the missing check.  With a non-zero access counter,the function returns and the next fscache_end_cookie_access() callwill queue another fscache_cookie_state_machine() call to handle thestill-pending FSCACHE_COOKIE_DO_LRU_DISCARD.
 漏洞公开时间：2024-09-05 04:15:08
 漏洞创建时间：2024-09-05 12:40:47
 漏洞详情参考链接：
  https://nvd.nist.gov/vuln/detail/CVE-2024-45000
<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/0a4d41fa14b2a0efd40e350cfe8ec6a4c998ac1d |  |
| 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | https://git.kernel.org/stable/c/b8a50877f68efdcc0be3fcc5116e00c31b90e45b |  |
| 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | https://git.kernel.org/stable/c/dfaa39b05a6cf34a16c525a2759ee6ab26b5fef6 |  |
| 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | https://git.kernel.org/stable/c/f71aa06398aabc2e3eaac25acdf3d62e0094ba70 |  |
| suse_bugzilla | http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2024-45000 | https://bugzilla.suse.com/show_bug.cgi?id=1230170 |
| suse_bugzilla | https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2024/CVE-2024-45000.mbox | https://bugzilla.suse.com/show_bug.cgi?id=1230170 |
| suse_bugzilla | https://git.kernel.org/stable/c/b8a50877f68efdcc0be3fcc5116e00c31b90e45b | https://bugzilla.suse.com/show_bug.cgi?id=1230170 |
| suse_bugzilla | https://git.kernel.org/stable/c/dfaa39b05a6cf34a16c525a2759ee6ab26b5fef6 | https://bugzilla.suse.com/show_bug.cgi?id=1230170 |
| suse_bugzilla | https://git.kernel.org/stable/c/0a4d41fa14b2a0efd40e350cfe8ec6a4c998ac1d | https://bugzilla.suse.com/show_bug.cgi?id=1230170 |
| suse_bugzilla | https://git.kernel.org/stable/c/f71aa06398aabc2e3eaac25acdf3d62e0094ba70 | https://bugzilla.suse.com/show_bug.cgi?id=1230170 |
| suse_bugzilla | https://www.cve.org/CVERecord?id=CVE-2024-45000 | https://bugzilla.suse.com/show_bug.cgi?id=1230170 |
| suse_bugzilla | https://bugzilla.redhat.com/show_bug.cgi?id=2309863 | https://bugzilla.suse.com/show_bug.cgi?id=1230170 |
| redhat_bugzilla | https://lore.kernel.org/linux-cve-announce/2024090449-CVE-2024-45000-fd6f@gregkh/T | https://bugzilla.redhat.com/show_bug.cgi?id=2309863 |
| ubuntu | https://www.cve.org/CVERecord?id=CVE-2024-45000 | https://ubuntu.com/security/CVE-2024-45000 |
| ubuntu | https://git.kernel.org/linus/f71aa06398aabc2e3eaac25acdf3d62e0094ba70 (6.11-rc4) | https://ubuntu.com/security/CVE-2024-45000 |
| ubuntu | https://git.kernel.org/stable/c/b8a50877f68efdcc0be3fcc5116e00c31b90e45b | https://ubuntu.com/security/CVE-2024-45000 |
| ubuntu | https://git.kernel.org/stable/c/dfaa39b05a6cf34a16c525a2759ee6ab26b5fef6 | https://ubuntu.com/security/CVE-2024-45000 |
| ubuntu | https://git.kernel.org/stable/c/0a4d41fa14b2a0efd40e350cfe8ec6a4c998ac1d | https://ubuntu.com/security/CVE-2024-45000 |
| ubuntu | https://git.kernel.org/stable/c/f71aa06398aabc2e3eaac25acdf3d62e0094ba70 | https://ubuntu.com/security/CVE-2024-45000 |
| ubuntu | https://nvd.nist.gov/vuln/detail/CVE-2024-45000 | https://ubuntu.com/security/CVE-2024-45000 |
| ubuntu | https://launchpad.net/bugs/cve/CVE-2024-45000 | https://ubuntu.com/security/CVE-2024-45000 |
| ubuntu | https://security-tracker.debian.org/tracker/CVE-2024-45000 | https://ubuntu.com/security/CVE-2024-45000 |
| debian |  | https://security-tracker.debian.org/tracker/CVE-2024-45000 |

</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/0a4d41fa14b2a0efd40e350cfe8ec6a4c998ac1d |  | nvd |
|  |  | https://git.kernel.org/stable/c/b8a50877f68efdcc0be3fcc5116e00c31b90e45b |  | nvd |
|  |  | https://git.kernel.org/stable/c/dfaa39b05a6cf34a16c525a2759ee6ab26b5fef6 |  | nvd |
|  |  | https://git.kernel.org/stable/c/f71aa06398aabc2e3eaac25acdf3d62e0094ba70 |  | nvd |
| linux |  | https://git.kernel.org/linus/f71aa06398aabc2e3eaac25acdf3d62e0094ba70 | https://git.kernel.org/linus/12bb21a29c19aae50cfad4e2bb5c943108f34a7d | 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:fs/netfs/fscache_cookie: add missing  n_accesses  checkThis fixes a NULL pointer dereference bug due to a data race whichlooks like this:  BUG: kernel NULL pointer dereference, address: 0000000000000008  #PF: supervisor read access in kernel mode  #PF: error_code(0x0000) - not-present page  PGD 0 P4D 0  Oops: 0000 [#1] SMP PTI  CPU: 33 PID: 16573 Comm: kworker/u97:799 Not tainted 6.8.7-cm4all1-hp+ #43  Hardware name: HP ProLiant DL380 Gen9/ProLiant DL380 Gen9, BIOS P89 10/17/2018  Workqueue: events_unbound netfs_rreq_write_to_cache_work  RIP: 0010:cachefiles_prepare_write+0x30/0xa0  Code: 57 41 56 45 89 ce 41 55 49 89 cd 41 54 49 89 d4 55 53 48 89 fb 48 83 ec 08 48 8b 47 08 48 83 7f 10 00 48 89 34 24 48 8b 68 20 <48> 8b 45 08 4c 8b 38 74 45 49 8b 7f 50 e8 4e a9 b0 ff 48 8b 73 10  RSP: 0018:ffffb4e78113bde0 EFLAGS: 00010286  RAX: ffff976126be6d10 RBX: ffff97615cdb8438 RCX: 0000000000020000  RDX: ffff97605e6c4c68 RSI: ffff97605e6c4c60 RDI: ffff97615cdb8438  RBP: 0000000000000000 R08: 0000000000278333 R09: 0000000000000001  R10: ffff97605e6c4600 R11: 0000000000000001 R12: ffff97605e6c4c68  R13: 0000000000020000 R14: 0000000000000001 R15: ffff976064fe2c00  FS:  0000000000000000(0000) GS:ffff9776dfd40000(0000) knlGS:0000000000000000  CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033  CR2: 0000000000000008 CR3: 000000005942c002 CR4: 00000000001706f0  Call Trace:   <TASK>   ? __die+0x1f/0x70   ? page_fault_oops+0x15d/0x440   ? search_module_extables+0xe/0x40   ? fixup_exception+0x22/0x2f0   ? exc_page_fault+0x5f/0x100   ? asm_exc_page_fault+0x22/0x30   ? cachefiles_prepare_write+0x30/0xa0   netfs_rreq_write_to_cache_work+0x135/0x2e0   process_one_work+0x137/0x2c0   worker_thread+0x2e9/0x400   ? __pfx_worker_thread+0x10/0x10   kthread+0xcc/0x100   ? __pfx_kthread+0x10/0x10   ret_from_fork+0x30/0x50   ? __pfx_kthread+0x10/0x10   ret_from_fork_asm+0x1b/0x30   </TASK>  Modules linked in:  CR2: 0000000000000008  ---[ end trace 0000000000000000 ]---This happened because fscache_cookie_state_machine() was slow and wasstill running while another process invoked fscache_unuse_cookie();this led to a fscache_cookie_lru_do_one() call, setting theFSCACHE_COOKIE_DO_LRU_DISCARD flag, which was picked up byfscache_cookie_state_machine(), withdrawing the cookie viacachefiles_withdraw_cookie(), clearing cookie->cache_priv.At the same time, yet another process invokedcachefiles_prepare_write(), which found a NULL pointer in this codeline:  struct cachefiles_object *object = cachefiles_cres_object(cres);The next line crashes, obviously:  struct cachefiles_cache *cache = object->volume->cache;During cachefiles_prepare_write(), the  n_accesses  counter isnon-zero (via fscache_begin_operation()).  The cookie must not bewithdrawn until it drops to zero.The counter is checked by fscache_cookie_state_machine() beforeswitching to FSCACHE_COOKIE_STATE_RELINQUISHING andFSCACHE_COOKIE_STATE_WITHDRAWING (in  caseFSCACHE_COOKIE_STATE_FAILED ), but not forFSCACHE_COOKIE_STATE_LRU_DISCARDING ( caseFSCACHE_COOKIE_STATE_ACTIVE ).This patch adds the missing check.  With a non-zero access counter,the function returns and the next fscache_end_cookie_access() callwill queue another fscache_cookie_state_machine() call to handle thestill-pending FSCACHE_COOKIE_DO_LRU_DISCARD.   
 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-24.03-LTS(6.6.0):受影响
2.openEuler-20.03-LTS-SP4(4.19.90):不受影响
3.openEuler-22.03-LTS-SP1(5.10.0):不受影响
4.openEuler-22.03-LTS-SP3(5.10.0):不受影响
5.openEuler-22.03-LTS-SP4(5.10.0):不受影响
6.master(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(6.6.0):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-2024-2181

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