CVE-2024-40955

一、漏洞信息
 漏洞编号：[CVE-2024-40955](https://nvd.nist.gov/vuln/detail/CVE-2024-40955)
 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:ext4: fix slab-out-of-bounds in ext4_mb_find_good_group_avg_frag_lists()We can trigger a slab-out-of-bounds with the following commands:    mkfs.ext4 -F /dev/$disk 10G    mount /dev/$disk /tmp/test    echo 2147483647 > /sys/fs/ext4/$disk/mb_group_prealloc    echo test > /tmp/test/file && sync==================================================================BUG: KASAN: slab-out-of-bounds in ext4_mb_find_good_group_avg_frag_lists+0x8a/0x200 [ext4]Read of size 8 at addr ffff888121b9d0f0 by task kworker/u2:0/11CPU: 0 PID: 11 Comm: kworker/u2:0 Tainted: GL 6.7.0-next-20240118 #521Call Trace: dump_stack_lvl+0x2c/0x50 kasan_report+0xb6/0xf0 ext4_mb_find_good_group_avg_frag_lists+0x8a/0x200 [ext4] ext4_mb_regular_allocator+0x19e9/0x2370 [ext4] ext4_mb_new_blocks+0x88a/0x1370 [ext4] ext4_ext_map_blocks+0x14f7/0x2390 [ext4] ext4_map_blocks+0x569/0xea0 [ext4] ext4_do_writepages+0x10f6/0x1bc0 [ext4][...]==================================================================The flow of issue triggering is as follows:// Set s_mb_group_prealloc to 2147483647 via sysfsext4_mb_new_blocks  ext4_mb_normalize_request    ext4_mb_normalize_group_request      ac->ac_g_ex.fe_len = EXT4_SB(sb)->s_mb_group_prealloc  ext4_mb_regular_allocator    ext4_mb_choose_next_group      ext4_mb_choose_next_group_best_avail        mb_avg_fragment_size_order          order = fls(len) - 2 = 29        ext4_mb_find_good_group_avg_frag_lists          frag_list = &sbi->s_mb_avg_fragment_size[order]          if (list_empty(frag_list)) // Trigger SOOB!At 4k block size, the length of the s_mb_avg_fragment_size list is 14,but an oversized s_mb_group_prealloc is set, causing slab-out-of-boundsto be triggered by an attempt to access an element at index 29.Add a new attr_id attr_clusters_in_group with values in the range[0, sbi->s_clusters_per_group] and declare mb_group_prealloc asthat type to fix the issue. In addition avoid returning an orderfrom mb_avg_fragment_size_order() greater than MB_NUM_ORDERS(sb)and reduce some useless loops.
 漏洞公开时间：2024-07-12 21:15:17
 漏洞创建时间：2024-07-15 13:45:04
 漏洞详情参考链接：
  https://nvd.nist.gov/vuln/detail/CVE-2024-40955
<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/13df4d44a3aaabe61cd01d277b6ee23ead2a5206 |  |
| 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | https://git.kernel.org/stable/c/677ff4589f1501578fa903a25bb14831d0607992 |  |
| 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | https://git.kernel.org/stable/c/b829687ae1229224262bcabf49accfa2dbf8db06 |  |
| suse_bugzilla | http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2024-40955 | https://bugzilla.suse.com/show_bug.cgi?id=1227809 |
| suse_bugzilla | https://www.cve.org/CVERecord?id=CVE-2024-40955 | https://bugzilla.suse.com/show_bug.cgi?id=1227809 |
| suse_bugzilla | https://git.kernel.org/stable/c/13df4d44a3aaabe61cd01d277b6ee23ead2a5206 | https://bugzilla.suse.com/show_bug.cgi?id=1227809 |
| suse_bugzilla | https://git.kernel.org/stable/c/677ff4589f1501578fa903a25bb14831d0607992 | https://bugzilla.suse.com/show_bug.cgi?id=1227809 |
| suse_bugzilla | https://git.kernel.org/stable/c/b829687ae1229224262bcabf49accfa2dbf8db06 | https://bugzilla.suse.com/show_bug.cgi?id=1227809 |
| suse_bugzilla | https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2024/CVE-2024-40955.mbox | https://bugzilla.suse.com/show_bug.cgi?id=1227809 |
| ubuntu | https://www.cve.org/CVERecord?id=CVE-2024-40955 | https://ubuntu.com/security/CVE-2024-40955 |
| ubuntu | https://git.kernel.org/linus/13df4d44a3aaabe61cd01d277b6ee23ead2a5206 (6.10-rc1) | https://ubuntu.com/security/CVE-2024-40955 |
| ubuntu | https://git.kernel.org/stable/c/677ff4589f1501578fa903a25bb14831d0607992 | https://ubuntu.com/security/CVE-2024-40955 |
| ubuntu | https://git.kernel.org/stable/c/b829687ae1229224262bcabf49accfa2dbf8db06 | https://ubuntu.com/security/CVE-2024-40955 |
| ubuntu | https://git.kernel.org/stable/c/13df4d44a3aaabe61cd01d277b6ee23ead2a5206 | https://ubuntu.com/security/CVE-2024-40955 |
| ubuntu | https://nvd.nist.gov/vuln/detail/CVE-2024-40955 | https://ubuntu.com/security/CVE-2024-40955 |
| ubuntu | https://launchpad.net/bugs/cve/CVE-2024-40955 | https://ubuntu.com/security/CVE-2024-40955 |
| ubuntu | https://security-tracker.debian.org/tracker/CVE-2024-40955 | https://ubuntu.com/security/CVE-2024-40955 |
| debian |  | https://security-tracker.debian.org/tracker/CVE-2024-40955 |
| cve_search |  | https://git.kernel.org/stable/c/677ff4589f1501578fa903a25bb14831d0607992 |
| cve_search |  | https://git.kernel.org/stable/c/b829687ae1229224262bcabf49accfa2dbf8db06 |
| cve_search |  | https://git.kernel.org/stable/c/13df4d44a3aaabe61cd01d277b6ee23ead2a5206 |

</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/13df4d44a3aaabe61cd01d277b6ee23ead2a5206 |  | nvd |
|  |  | https://git.kernel.org/stable/c/677ff4589f1501578fa903a25bb14831d0607992 |  | nvd |
|  |  | https://git.kernel.org/stable/c/b829687ae1229224262bcabf49accfa2dbf8db06 |  | nvd |
| linux |  | https://git.kernel.org/linus/13df4d44a3aaabe61cd01d277b6ee23ead2a5206 | https://git.kernel.org/linus/7e170922f06bf46effa7c57f6035fc463d6edc7e | 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:ext4: fix slab-out-of-bounds in ext4_mb_find_good_group_avg_frag_lists()We can trigger a slab-out-of-bounds with the following commands:    mkfs.ext4 -F /dev/$disk 10G    mount /dev/$disk /tmp/test    echo 2147483647 > /sys/fs/ext4/$disk/mb_group_prealloc    echo test > /tmp/test/file && sync==================================================================BUG: KASAN: slab-out-of-bounds in ext4_mb_find_good_group_avg_frag_lists+0x8a/0x200 [ext4]Read of size 8 at addr ffff888121b9d0f0 by task kworker/u2:0/11CPU: 0 PID: 11 Comm: kworker/u2:0 Tainted: GL 6.7.0-next-20240118 #521Call Trace: dump_stack_lvl+0x2c/0x50 kasan_report+0xb6/0xf0 ext4_mb_find_good_group_avg_frag_lists+0x8a/0x200 [ext4] ext4_mb_regular_allocator+0x19e9/0x2370 [ext4] ext4_mb_new_blocks+0x88a/0x1370 [ext4] ext4_ext_map_blocks+0x14f7/0x2390 [ext4] ext4_map_blocks+0x569/0xea0 [ext4] ext4_do_writepages+0x10f6/0x1bc0 [ext4][...]==================================================================The flow of issue triggering is as follows:// Set s_mb_group_prealloc to 2147483647 via sysfsext4_mb_new_blocks  ext4_mb_normalize_request    ext4_mb_normalize_group_request      ac->ac_g_ex.fe_len = EXT4_SB(sb)->s_mb_group_prealloc  ext4_mb_regular_allocator    ext4_mb_choose_next_group      ext4_mb_choose_next_group_best_avail        mb_avg_fragment_size_order          order = fls(len) - 2 = 29        ext4_mb_find_good_group_avg_frag_lists          frag_list = &sbi->s_mb_avg_fragment_size[order]          if (list_empty(frag_list)) // Trigger SOOB!At 4k block size, the length of the s_mb_avg_fragment_size list is 14,but an oversized s_mb_group_prealloc is set, causing slab-out-of-boundsto be triggered by an attempt to access an element at index 29.Add a new attr_id attr_clusters_in_group with values in the range[0, sbi->s_clusters_per_group] and declare mb_group_prealloc asthat type to fix the issue. In addition avoid returning an orderfrom mb_avg_fragment_size_order() greater than MB_NUM_ORDERS(sb)and reduce some useless loops.
 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(6.1.0):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-2024-2076

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