CVE-2024-42317

一、漏洞信息
 漏洞编号：[CVE-2024-42317](https://nvd.nist.gov/vuln/detail/CVE-2024-42317)
 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 None
  Vector：CVSS：2.0/
 漏洞简述：
  In the Linux kernel, the following vulnerability has been resolved:mm/huge_memory: avoid PMD-size page cache if neededxarray can t support arbitrary page cache size.  the largest and supportedpage cache size is defined as MAX_PAGECACHE_ORDER by commit 099d90642a71( mm/filemap: make MAX_PAGECACHE_ORDER acceptable to xarray ).  However,it s possible to have 512MB page cache in the huge memory s collapsingpath on ARM64 system whose base page size is 64KB.  512MB page cache isbreaking the limitation and a warning is raised when the xarray entry issplit as shown in the following example.[root@dhcp-10-26-1-207 ~]# cat /proc/1/smaps | grep KernelPageSizeKernelPageSize:       64 kB[root@dhcp-10-26-1-207 ~]# cat /tmp/test.c   :int main(int argc, char **argv){	const char *filename = TEST_XFS_FILENAME;	int fd = 0;	void *buf = (void *)-1, *p;	int pgsize = getpagesize();	int ret = 0;	if (pgsize != 0x10000) {		fprintf(stdout,  System with 64KB base page size is required! n );		return -EPERM;	}	system( echo 0 > /sys/devices/virtual/bdi/253:0/read_ahead_kb );	system( echo 1 > /proc/sys/vm/drop_caches );	/* Open the xfs file */	fd = open(filename, O_RDONLY);	assert(fd > 0);	/* Create VMA */	buf = mmap(NULL, TEST_MEM_SIZE, PROT_READ, MAP_SHARED, fd, 0);	assert(buf != (void *)-1);	fprintf(stdout,  mapped buffer at 0x%p n , buf);	/* Populate VMA */	ret = madvise(buf, TEST_MEM_SIZE, MADV_NOHUGEPAGE);	assert(ret == 0);	ret = madvise(buf, TEST_MEM_SIZE, MADV_POPULATE_READ);	assert(ret == 0);	/* Collapse VMA */	ret = madvise(buf, TEST_MEM_SIZE, MADV_HUGEPAGE);	assert(ret == 0);	ret = madvise(buf, TEST_MEM_SIZE, MADV_COLLAPSE);	if (ret) {		fprintf(stdout,  Error %d to madvise(MADV_COLLAPSE) n , errno);		goto out;	}	/* Split xarray entry. Write permission is needed */	munmap(buf, TEST_MEM_SIZE);	buf = (void *)-1;	close(fd);	fd = open(filename, O_RDWR);	assert(fd > 0);	fallocate(fd, FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE, 		  TEST_MEM_SIZE - pgsize, pgsize);out:	if (buf != (void *)-1)		munmap(buf, TEST_MEM_SIZE);	if (fd > 0)		close(fd);	return ret;}[root@dhcp-10-26-1-207 ~]# gcc /tmp/test.c -o /tmp/test[root@dhcp-10-26-1-207 ~]# /tmp/test ------------[ cut here ]------------ WARNING: CPU: 25 PID: 7560 at lib/xarray.c:1025 xas_split_alloc+0xf8/0x128 Modules linked in: 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 virtio_net    sha1_ce net_failover virtio_blk virtio_console failover dimlib virtio_mmio CPU: 25 PID: 7560 Comm: test Kdump: loaded Not tainted 6.10.0-rc7-gavin+ #9 Hardware name: QEMU KVM Virtual Machine, BIOS edk2-20240524-1.el9 05/24/2024 pstate: 83400005 (Nzcv daif +PAN -UAO +TCO +DIT -SSBS BTYPE=--) pc : xas_split_alloc+0xf8/0x128 lr : split_huge_page_to_list_to_order+0x1c4/0x780 sp : ffff8000ac32f660 x29: ffff8000ac32f660 x28: ffff0000e0969eb0 x27: ffff8000ac32f6c0 x26: 0000000000000c40 x25: ffff0000e0969eb0 x24: 000000000000000d x23: ffff8000ac32f6c0 x22: ffffffdfc0700000 x21: 0000000000000000 x20: 0000000000000000 x19: ffffffdfc0700000 x18: 0000000000000000 x17: 0000000000000000 x16: ffffd5f3708ffc70 x15: 0000000000000000 x14: 0000000000000000 x13: 0000000000000000 x12: 0000000000000000 x11: ffffffffffffffc0 x10: 0000000000000040 x9 : ffffd5f3708e692c x8 : 0000000000000003 x7 : 0000000000000000 x6 : ffff0000e0969eb8 x5 : ffffd5f37289e378 x4 : 0000000000000000 x3 : 0000000000000c40 x2 : 000000000000000d x1 : 000000000000000c x0 : 0000000000000000 Call trace:  xas_split_alloc+0xf8/0x128  split_huge_page_to_list_to_order+0x1c4/0x780  truncate_inode_partial_folio+0xdc/0x160  truncate_inode_pages_range+0x1b4/0x4a8  truncate_pagecache_range+0x84/0xa---truncated---
 漏洞公开时间：2024-08-17 17:15:11
 漏洞创建时间：2024-08-18 02:15:49
 漏洞详情参考链接：
  https://nvd.nist.gov/vuln/detail/CVE-2024-42317
<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/d659b715e94ac039803d7601505d3473393fc0be |  |
| 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | https://git.kernel.org/stable/c/e60f62f75c99740a28e2bf7e6044086033012a16 |  |
| suse_bugzilla | http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2024-42317 | https://bugzilla.suse.com/show_bug.cgi?id=1229352 |
| suse_bugzilla | https://www.cve.org/CVERecord?id=CVE-2024-42317 | https://bugzilla.suse.com/show_bug.cgi?id=1229352 |
| suse_bugzilla | https://git.kernel.org/stable/c/d659b715e94ac039803d7601505d3473393fc0be | https://bugzilla.suse.com/show_bug.cgi?id=1229352 |
| suse_bugzilla | https://git.kernel.org/stable/c/e60f62f75c99740a28e2bf7e6044086033012a16 | https://bugzilla.suse.com/show_bug.cgi?id=1229352 |
| suse_bugzilla | https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2024/CVE-2024-42317.mbox | https://bugzilla.suse.com/show_bug.cgi?id=1229352 |
| ubuntu | https://www.cve.org/CVERecord?id=CVE-2024-42317 | https://ubuntu.com/security/CVE-2024-42317 |
| ubuntu | https://git.kernel.org/linus/d659b715e94ac039803d7601505d3473393fc0be (6.11-rc1) | https://ubuntu.com/security/CVE-2024-42317 |
| ubuntu | https://git.kernel.org/stable/c/e60f62f75c99740a28e2bf7e6044086033012a16 | https://ubuntu.com/security/CVE-2024-42317 |
| ubuntu | https://git.kernel.org/stable/c/d659b715e94ac039803d7601505d3473393fc0be | https://ubuntu.com/security/CVE-2024-42317 |
| ubuntu | https://nvd.nist.gov/vuln/detail/CVE-2024-42317 | https://ubuntu.com/security/CVE-2024-42317 |
| ubuntu | https://launchpad.net/bugs/cve/CVE-2024-42317 | https://ubuntu.com/security/CVE-2024-42317 |
| ubuntu | https://security-tracker.debian.org/tracker/CVE-2024-42317 | https://ubuntu.com/security/CVE-2024-42317 |
| debian |  | https://security-tracker.debian.org/tracker/CVE-2024-42317 |

</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/d659b715e94ac039803d7601505d3473393fc0be | 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/huge_memory: avoid PMD-size page cache if neededxarray can_x27;t support arbitrary page cache size.  the largest and supportedpage cache size is defined as MAX_PAGECACHE_ORDER by commit 099d90642a71( mm/filemap: make MAX_PAGECACHE_ORDER acceptable to xarray ).  However,it_x27;s possible to have 512MB page cache in the huge memory_x27;s collapsingpath on ARM64 system whose base page size is 64KB.  512MB page cache isbreaking the limitation and a warning is raised when the xarray entry issplit as shown in the following example.[root@dhcp-10-26-1-207 ~]# cat /proc/1/smaps | grep KernelPageSizeKernelPageSize:       64 kB[root@dhcp-10-26-1-207 ~]# cat /tmp/test.c   :int main(int argc, char **argv){const char *filename = TEST_XFS_FILENAME;int fd = 0;void *buf = (void *)-1, *p;int pgsize = getpagesize();int ret = 0;if (pgsize != 0x10000) {fprintf(stdout,  System with 64KB base page size is required! n );return -EPERM;}system( echo 0 &gt; /sys/devices/virtual/bdi/253:0/read_ahead_kb );system( echo 1 &gt; /proc/sys/vm/drop_caches );/* Open the xfs file */fd = open(filename, O_RDONLY);assert(fd &gt; 0);/* Create VMA */buf = mmap(NULL, TEST_MEM_SIZE, PROT_READ, MAP_SHARED, fd, 0);assert(buf != (void *)-1);fprintf(stdout,  mapped buffer at 0x%p n , buf);/* Populate VMA */ret = madvise(buf, TEST_MEM_SIZE, MADV_NOHUGEPAGE);assert(ret == 0);ret = madvise(buf, TEST_MEM_SIZE, MADV_POPULATE_READ);assert(ret == 0);/* Collapse VMA */ret = madvise(buf, TEST_MEM_SIZE, MADV_HUGEPAGE);assert(ret == 0);ret = madvise(buf, TEST_MEM_SIZE, MADV_COLLAPSE);if (ret) {fprintf(stdout,  Error %d to madvise(MADV_COLLAPSE) n , errno);goto out;}/* Split xarray entry. Write permission is needed */munmap(buf, TEST_MEM_SIZE);buf = (void *)-1;close(fd);fd = open(filename, O_RDWR);assert(fd &gt; 0);fallocate(fd, FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE,   TEST_MEM_SIZE - pgsize, pgsize);out:if (buf != (void *)-1)munmap(buf, TEST_MEM_SIZE);if (fd &gt; 0)close(fd);return ret;}[root@dhcp-10-26-1-207 ~]# gcc /tmp/test.c -o /tmp/test[root@dhcp-10-26-1-207 ~]# /tmp/test ------------[ cut here ]------------ WARNING: CPU: 25 PID: 7560 at lib/xarray.c:1025 xas_split_alloc+0xf8/0x128 Modules linked in: 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 virtio_net    sha1_ce net_failover virtio_blk virtio_console failover dimlib virtio_mmio CPU: 25 PID: 7560 Comm: test Kdump: loaded Not tainted 6.10.0-rc7-gavin+ #9 Hardware name: QEMU KVM Virtual Machine, BIOS edk2-20240524-1.el9 05/24/2024 pstate: 83400005 (Nzcv daif +PAN -UAO +TCO +DIT -SSBS BTYPE=--) pc : xas_split_alloc+0xf8/0x128 lr : split_huge_page_to_list_to_order+0x1c4/0x780 sp : ffff8000ac32f660 x29: ffff8000ac32f660 x28: ffff0000e0969eb0 x27: ffff8000ac32f6c0 x26: 0000000000000c40 x25: ffff0000e0969eb0 x24: 000000000000000d x23: ffff8000ac32f6c0 x22: ffffffdfc0700000 x21: 0000000000000000 x20: 0000000000000000 x19: ffffffdfc0700000 x18: 0000000000000000 x17: 0000000000000000 x16: ffffd5f3708ffc70 x15: 0000000000000000 x14: 0000000000000000 x13: 0000000000000000 x12: 0000000000000000 x11: ffffffffffffffc0 x10: 0000000000000040 x9 : ffffd5f3708e692c x8 : 0000000000000003 x7 : 0000000000000000 x6 : ffff0000e0969eb8 x5 : ffffd5f37289e378 x4 : 0000000000000000 x3 : 0000000000000c40 x2 : 000000000000000d x1 : 000000000000000c x0 : 0000000000000000 Call trace:  xas_split_alloc+0xf8/0x128  split_huge_page_to_list_to_order+0x1c4/0x780  truncate_inode_partial_folio+0xdc/0x160  truncate_inode_pages_range+0x1b4/0x4a8
 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

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