CVE-2024-42305

一、漏洞信息
 漏洞编号：[CVE-2024-42305](https://nvd.nist.gov/vuln/detail/CVE-2024-42305)
 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：0.0 None
  Vector：CVSS：3.0/
 漏洞简述：
  In the Linux kernel, the following vulnerability has been resolved:ext4: check dot and dotdot of dx_root before making dir indexedSyzbot reports a issue as follows:============================================BUG: unable to handle page fault for address: ffffed11022e24fePGD 23ffee067 P4D 23ffee067 PUD 0Oops: Oops: 0000 [#1] PREEMPT SMP KASAN PTICPU: 0 PID: 5079 Comm: syz-executor306 Not tainted 6.10.0-rc5-g55027e689933 #0Call Trace: <TASK> make_indexed_dir+0xdaf/0x13c0 fs/ext4/namei.c:2341 ext4_add_entry+0x222a/0x25d0 fs/ext4/namei.c:2451 ext4_rename fs/ext4/namei.c:3936 [inline] ext4_rename2+0x26e5/0x4370 fs/ext4/namei.c:4214[...]============================================The immediate cause of this problem is that there is only one valid dentryfor the block to be split during do_split, so split==0 results in out ofbounds accesses to the map triggering the issue.    do_split      unsigned split      dx_make_map       count = 1      split = count/2 = 0;      continued = hash2 == map[split - 1].hash;       ---> map[4294967295]The maximum length of a filename is 255 and the minimum block size is 1024,so it is always guaranteed that the number of entries is greater than orequal to 2 when do_split() is called.But syzbot s crafted image has no dot and dotdot in dir, and the dentrydistribution in dirblock is as follows:  bus     dentry1          hole           dentry2           free|xx--|xx-------------|...............|xx-------------|...............|0   12 (8+248)=256  268     256     524 (8+256)=264 788     236     1024So when renaming dentry1 increases its name_len length by 1, neither holenor free is sufficient to hold the new dentry, and make_indexed_dir() iscalled.In make_indexed_dir() it is assumed that the first two entries of thedirblock must be dot and dotdot, so bus and dentry1 are left in dx_rootbecause they are treated as dot and dotdot, and only dentry2 is movedto the new leaf block. That s why count is equal to 1.Therefore add the ext4_check_dx_root() helper function to add more sanitychecks to dot and dotdot before starting the conversion to avoid the aboveissue.
 漏洞公开时间：2024-08-17 17:15:10
 漏洞创建时间：2024-08-21 02:09:36
 漏洞详情参考链接：
  https://nvd.nist.gov/vuln/detail/CVE-2024-42305
<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/19e13b4d7f0303186fcc891aba8d0de7c8fdbda8 |  |
| 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | https://git.kernel.org/stable/c/42d420517072028fb0eb852c358056b7717ba5aa |  |
| 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | https://git.kernel.org/stable/c/50ea741def587a64e08879ce6c6a30131f7111e7 |  |
| 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | https://git.kernel.org/stable/c/8afe06ed3be7a874b3cd82ef5f8959aca8d6429a |  |
| 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | https://git.kernel.org/stable/c/9d241b7a39af192d1bb422714a458982c7cc67a2 |  |
| 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | https://git.kernel.org/stable/c/abb411ac991810c0bcbe51c2e76d2502bf611b5c |  |
| 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | https://git.kernel.org/stable/c/b80575ffa98b5bb3a5d4d392bfe4c2e03e9557db |  |
| 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | https://git.kernel.org/stable/c/cdd345321699042ece4a9d2e70754d2397d378c5 |  |
| suse_bugzilla | http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2024-42305 | https://bugzilla.suse.com/show_bug.cgi?id=1229363 |
| suse_bugzilla | https://www.cve.org/CVERecord?id=CVE-2024-42305 | https://bugzilla.suse.com/show_bug.cgi?id=1229363 |
| suse_bugzilla | https://git.kernel.org/stable/c/50ea741def587a64e08879ce6c6a30131f7111e7 | https://bugzilla.suse.com/show_bug.cgi?id=1229363 |
| suse_bugzilla | https://git.kernel.org/stable/c/9d241b7a39af192d1bb422714a458982c7cc67a2 | https://bugzilla.suse.com/show_bug.cgi?id=1229363 |
| suse_bugzilla | https://git.kernel.org/stable/c/abb411ac991810c0bcbe51c2e76d2502bf611b5c | https://bugzilla.suse.com/show_bug.cgi?id=1229363 |
| suse_bugzilla | https://git.kernel.org/stable/c/cdd345321699042ece4a9d2e70754d2397d378c5 | https://bugzilla.suse.com/show_bug.cgi?id=1229363 |
| suse_bugzilla | https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2024/CVE-2024-42305.mbox | https://bugzilla.suse.com/show_bug.cgi?id=1229363 |
| suse_bugzilla | https://git.kernel.org/stable/c/19e13b4d7f0303186fcc891aba8d0de7c8fdbda8 | https://bugzilla.suse.com/show_bug.cgi?id=1229363 |
| suse_bugzilla | https://git.kernel.org/stable/c/42d420517072028fb0eb852c358056b7717ba5aa | https://bugzilla.suse.com/show_bug.cgi?id=1229363 |
| suse_bugzilla | https://git.kernel.org/stable/c/8afe06ed3be7a874b3cd82ef5f8959aca8d6429a | https://bugzilla.suse.com/show_bug.cgi?id=1229363 |
| suse_bugzilla | https://git.kernel.org/stable/c/b80575ffa98b5bb3a5d4d392bfe4c2e03e9557db | https://bugzilla.suse.com/show_bug.cgi?id=1229363 |
| ubuntu | https://www.cve.org/CVERecord?id=CVE-2024-42305 | https://ubuntu.com/security/CVE-2024-42305 |
| ubuntu | https://git.kernel.org/linus/50ea741def587a64e08879ce6c6a30131f7111e7 (6.11-rc1) | https://ubuntu.com/security/CVE-2024-42305 |
| ubuntu | https://git.kernel.org/stable/c/abb411ac991810c0bcbe51c2e76d2502bf611b5c | https://ubuntu.com/security/CVE-2024-42305 |
| ubuntu | https://git.kernel.org/stable/c/9d241b7a39af192d1bb422714a458982c7cc67a2 | https://ubuntu.com/security/CVE-2024-42305 |
| ubuntu | https://git.kernel.org/stable/c/cdd345321699042ece4a9d2e70754d2397d378c5 | https://ubuntu.com/security/CVE-2024-42305 |
| ubuntu | https://git.kernel.org/stable/c/50ea741def587a64e08879ce6c6a30131f7111e7 | https://ubuntu.com/security/CVE-2024-42305 |
| ubuntu | https://git.kernel.org/stable/c/b80575ffa98b5bb3a5d4d392bfe4c2e03e9557db | https://ubuntu.com/security/CVE-2024-42305 |
| ubuntu | https://git.kernel.org/stable/c/19e13b4d7f0303186fcc891aba8d0de7c8fdbda8 | https://ubuntu.com/security/CVE-2024-42305 |
| ubuntu | https://git.kernel.org/stable/c/42d420517072028fb0eb852c358056b7717ba5aa | https://ubuntu.com/security/CVE-2024-42305 |
| ubuntu | https://git.kernel.org/stable/c/8afe06ed3be7a874b3cd82ef5f8959aca8d6429a | https://ubuntu.com/security/CVE-2024-42305 |
| ubuntu | https://nvd.nist.gov/vuln/detail/CVE-2024-42305 | https://ubuntu.com/security/CVE-2024-42305 |
| ubuntu | https://launchpad.net/bugs/cve/CVE-2024-42305 | https://ubuntu.com/security/CVE-2024-42305 |
| ubuntu | https://security-tracker.debian.org/tracker/CVE-2024-42305 | https://ubuntu.com/security/CVE-2024-42305 |
| debian |  | https://security-tracker.debian.org/tracker/CVE-2024-42305 |
| anolis |  | https://anas.openanolis.cn/cves/detail/CVE-2024-42305 |
| mageia |  | http://advisories.mageia.org/MGASA-2024-0309.html |

</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/50ea741def587a64e08879ce6c6a30131f7111e7 | https://git.kernel.org/linus/ac27a0ec112a089f1a5102bc8dffc79c8c815571 | 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: check dot and dotdot of dx_root before making dir indexedSyzbot reports a issue as follows:============================================BUG: unable to handle page fault for address: ffffed11022e24fePGD 23ffee067 P4D 23ffee067 PUD 0Oops: Oops: 0000 [#1] PREEMPT SMP KASAN PTICPU: 0 PID: 5079 Comm: syz-executor306 Not tainted 6.10.0-rc5-g55027e689933 #0Call Trace: <TASK> make_indexed_dir+0xdaf/0x13c0 fs/ext4/namei.c:2341 ext4_add_entry+0x222a/0x25d0 fs/ext4/namei.c:2451 ext4_rename fs/ext4/namei.c:3936 [inline] ext4_rename2+0x26e5/0x4370 fs/ext4/namei.c:4214[...]============================================The immediate cause of this problem is that there is only one valid dentryfor the block to be split during do_split, so split==0 results in out ofbounds accesses to the map triggering the issue.    do_split      unsigned split      dx_make_map       count = 1      split = count/2 = 0;      continued = hash2 == map[split - 1].hash;       ---> map[4294967295]The maximum length of a filename is 255 and the minimum block size is 1024,so it is always guaranteed that the number of entries is greater than orequal to 2 when do_split() is called.But syzbot s crafted image has no dot and dotdot in dir, and the dentrydistribution in dirblock is as follows:  bus     dentry1          hole           dentry2           free|xx--|xx-------------|...............|xx-------------|...............|0   12 (8+248)=256  268     256     524 (8+256)=264 788     236     1024So when renaming dentry1 increases its name_len length by 1, neither holenor free is sufficient to hold the new dentry, and make_indexed_dir() iscalled.In make_indexed_dir() it is assumed that the first two entries of thedirblock must be dot and dotdot, so bus and dentry1 are left in dx_rootbecause they are treated as dot and dotdot, and only dentry2 is movedto the new leaf block. That s why count is equal to 1.Therefore add the ext4_check_dx_root() helper function to add more sanitychecks to dot and dotdot before starting the conversion to avoid the aboveissue.
 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-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.openEuler-24.03-LTS(6.6.0):受影响
5.master(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-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
8.openEuler-24.03-LTS-SP1(6.6.0):否

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

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