CVE-2024-42241

一、漏洞信息
 漏洞编号：[CVE-2024-42241](https://nvd.nist.gov/vuln/detail/CVE-2024-42241)
 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:mm/shmem: disable PMD-sized page cache if neededFor shmem files, it s possible that PMD-sized page cache can t besupported by xarray.  For example, 512MB page cache on ARM64 when the basepage size is 64KB can t be supported by xarray.  It leads to errors as thefollowing messages indicate when this sort of xarray entry is split.WARNING: CPU: 34 PID: 7578 at lib/xarray.c:1025 xas_split_alloc+0xf8/0x128Modules linked in: binfmt_misc nft_fib_inet nft_fib_ipv4 nft_fib_ipv6    nft_fib nft_reject_inet nf_reject_ipv4 nf_reject_ipv6 nft_reject         nft_ct nft_chain_nat nf_nat nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4   ip_set rfkill nf_tables nfnetlink vfat fat virtio_balloon drm fuse xfs   libcrc32c crct10dif_ce ghash_ce sha2_ce sha256_arm64 sha1_ce virtio_net  net_failover virtio_console virtio_blk failover dimlib virtio_mmioCPU: 34 PID: 7578 Comm: test Kdump: loaded Tainted: G W 6.10.0-rc5-gavin+ #9Hardware name: QEMU KVM Virtual Machine, BIOS edk2-20240524-1.el9 05/24/2024pstate: 83400005 (Nzcv daif +PAN -UAO +TCO +DIT -SSBS BTYPE=--)pc : xas_split_alloc+0xf8/0x128lr : split_huge_page_to_list_to_order+0x1c4/0x720sp : ffff8000882af5f0x29: ffff8000882af5f0 x28: ffff8000882af650 x27: ffff8000882af768x26: 0000000000000cc0 x25: 000000000000000d x24: ffff00010625b858x23: ffff8000882af650 x22: ffffffdfc0900000 x21: 0000000000000000x20: 0000000000000000 x19: ffffffdfc0900000 x18: 0000000000000000x17: 0000000000000000 x16: 0000018000000000 x15: 52f8004000000000x14: 0000e00000000000 x13: 0000000000002000 x12: 0000000000000020x11: 52f8000000000000 x10: 52f8e1c0ffff6000 x9 : ffffbeb9619a681cx8 : 0000000000000003 x7 : 0000000000000000 x6 : ffff00010b02ddb0x5 : ffffbeb96395e378 x4 : 0000000000000000 x3 : 0000000000000cc0x2 : 000000000000000d x1 : 000000000000000c x0 : 0000000000000000Call trace: xas_split_alloc+0xf8/0x128 split_huge_page_to_list_to_order+0x1c4/0x720 truncate_inode_partial_folio+0xdc/0x160 shmem_undo_range+0x2bc/0x6a8 shmem_fallocate+0x134/0x430 vfs_fallocate+0x124/0x2e8 ksys_fallocate+0x4c/0xa0 __arm64_sys_fallocate+0x24/0x38 invoke_syscall.constprop.0+0x7c/0xd8 do_el0_svc+0xb4/0xd0 el0_svc+0x44/0x1d8 el0t_64_sync_handler+0x134/0x150 el0t_64_sync+0x17c/0x180Fix it by disabling PMD-sized page cache when HPAGE_PMD_ORDER is largerthan MAX_PAGECACHE_ORDER.  As Matthew Wilcox pointed, the page cache in ashmem file isn t represented by a multi-index entry and doesn t have thislimitation when the xarry entry is split until commit 6b24ca4a1a8d ( mm:Use multi-index entries in the page cache ).
 漏洞公开时间：2024-08-08 00:15:46
 漏洞创建时间：2024-08-08 08:48:35
 漏洞详情参考链接：
  https://nvd.nist.gov/vuln/detail/CVE-2024-42241
<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/93893eacb372b0a4a30f7de6609b08c3ba6c4fd9 |  |
| 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | https://git.kernel.org/stable/c/9fd154ba926b34c833b7bfc4c14ee2e931b3d743 |  |
| 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | https://git.kernel.org/stable/c/cd25208ca9b0097f8e079d692fc678f36fdbc3f9 |  |
| suse_bugzilla | http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2024-42241 | https://bugzilla.suse.com/show_bug.cgi?id=1228986 |
| suse_bugzilla | https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2024/CVE-2024-42241.mbox | https://bugzilla.suse.com/show_bug.cgi?id=1228986 |
| suse_bugzilla | https://git.kernel.org/stable/c/93893eacb372b0a4a30f7de6609b08c3ba6c4fd9 | https://bugzilla.suse.com/show_bug.cgi?id=1228986 |
| suse_bugzilla | https://git.kernel.org/stable/c/cd25208ca9b0097f8e079d692fc678f36fdbc3f9 | https://bugzilla.suse.com/show_bug.cgi?id=1228986 |
| suse_bugzilla | https://git.kernel.org/stable/c/9fd154ba926b34c833b7bfc4c14ee2e931b3d743 | https://bugzilla.suse.com/show_bug.cgi?id=1228986 |
| suse_bugzilla | https://www.cve.org/CVERecord?id=CVE-2024-42241 | https://bugzilla.suse.com/show_bug.cgi?id=1228986 |
| ubuntu | https://www.cve.org/CVERecord?id=CVE-2024-42241 | https://ubuntu.com/security/CVE-2024-42241 |
| ubuntu | https://git.kernel.org/linus/9fd154ba926b34c833b7bfc4c14ee2e931b3d743 (6.10) | https://ubuntu.com/security/CVE-2024-42241 |
| ubuntu | https://git.kernel.org/stable/c/93893eacb372b0a4a30f7de6609b08c3ba6c4fd9 | https://ubuntu.com/security/CVE-2024-42241 |
| ubuntu | https://git.kernel.org/stable/c/cd25208ca9b0097f8e079d692fc678f36fdbc3f9 | https://ubuntu.com/security/CVE-2024-42241 |
| ubuntu | https://git.kernel.org/stable/c/9fd154ba926b34c833b7bfc4c14ee2e931b3d743 | https://ubuntu.com/security/CVE-2024-42241 |
| ubuntu | https://nvd.nist.gov/vuln/detail/CVE-2024-42241 | https://ubuntu.com/security/CVE-2024-42241 |
| ubuntu | https://launchpad.net/bugs/cve/CVE-2024-42241 | https://ubuntu.com/security/CVE-2024-42241 |
| ubuntu | https://security-tracker.debian.org/tracker/CVE-2024-42241 | https://ubuntu.com/security/CVE-2024-42241 |
| debian |  | https://security-tracker.debian.org/tracker/CVE-2024-42241 |

</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/93893eacb372b0a4a30f7de6609b08c3ba6c4fd9 |  | nvd |
|  |  | https://git.kernel.org/stable/c/9fd154ba926b34c833b7bfc4c14ee2e931b3d743 |  | nvd |
|  |  | https://git.kernel.org/stable/c/cd25208ca9b0097f8e079d692fc678f36fdbc3f9 |  | nvd |
| linux |  | https://git.kernel.org/linus/9fd154ba926b34c833b7bfc4c14ee2e931b3d743 | https://git.kernel.org/linus/6b24ca4a1a8d4ee3221d6d44ddbb99f542e4bda3 | 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:mm/shmem: disable PMD-sized page cache if neededFor shmem files, it&#39;s possible that PMD-sized page cache can&#39;t besupported by xarray.  For example, 512MB page cache on ARM64 when the basepage size is 64KB can&#39;t be supported by xarray.  It leads to errors as thefollowing messages indicate when this sort of xarray entry is split.WARNING: CPU: 34 PID: 7578 at lib/xarray.c:1025 xas_split_alloc+0xf8/0x128Modules linked in: binfmt_misc nft_fib_inet nft_fib_ipv4 nft_fib_ipv6    nft_fib nft_reject_inet nf_reject_ipv4 nf_reject_ipv6 nft_reject         nft_ct nft_chain_nat nf_nat nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4   ip_set rfkill nf_tables nfnetlink vfat fat virtio_balloon drm fuse xfs   libcrc32c crct10dif_ce ghash_ce sha2_ce sha256_arm64 sha1_ce virtio_net  net_failover virtio_console virtio_blk failover dimlib virtio_mmioCPU: 34 PID: 7578 Comm: test Kdump: loaded Tainted: G W 6.10.0-rc5-gavin+ #9Hardware name: QEMU KVM Virtual Machine, BIOS edk2-20240524-1.el9 05/24/2024pstate: 83400005 (Nzcv daif +PAN -UAO +TCO +DIT -SSBS BTYPE=--)pc : xas_split_alloc+0xf8/0x128lr : split_huge_page_to_list_to_order+0x1c4/0x720sp : ffff8000882af5f0x29: ffff8000882af5f0 x28: ffff8000882af650 x27: ffff8000882af768x26: 0000000000000cc0 x25: 000000000000000d x24: ffff00010625b858x23: ffff8000882af650 x22: ffffffdfc0900000 x21: 0000000000000000x20: 0000000000000000 x19: ffffffdfc0900000 x18: 0000000000000000x17: 0000000000000000 x16: 0000018000000000 x15: 52f8004000000000x14: 0000e00000000000 x13: 0000000000002000 x12: 0000000000000020x11: 52f8000000000000 x10: 52f8e1c0ffff6000 x9 : ffffbeb9619a681cx8 : 0000000000000003 x7 : 0000000000000000 x6 : ffff00010b02ddb0x5 : ffffbeb96395e378 x4 : 0000000000000000 x3 : 0000000000000cc0x2 : 000000000000000d x1 : 000000000000000c x0 : 0000000000000000Call trace: xas_split_alloc+0xf8/0x128 split_huge_page_to_list_to_order+0x1c4/0x720 truncate_inode_partial_folio+0xdc/0x160 shmem_undo_range+0x2bc/0x6a8 shmem_fallocate+0x134/0x430 vfs_fallocate+0x124/0x2e8 ksys_fallocate+0x4c/0xa0 __arm64_sys_fallocate+0x24/0x38 invoke_syscall.constprop.0+0x7c/0xd8 do_el0_svc+0xb4/0xd0 el0_svc+0x44/0x1d8 el0t_64_sync_handler+0x134/0x150 el0t_64_sync+0x17c/0x180Fix it by disabling PMD-sized page cache when HPAGE_PMD_ORDER is largerthan MAX_PAGECACHE_ORDER.  As Matthew Wilcox pointed, the page cache in ashmem file isn&#39;t represented by a multi-index entry and doesn&#39;t have thislimitation when the xarry entry is split until commit 6b24ca4a1a8d (&#34;mm:Use multi-index entries in the page cache&#34;).The Linux kernel CVE team has assigned CVE-2024-42241 to this issue. 
 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-2024-2124

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