CVE-2022-49052

一、漏洞信息
 漏洞编号：[CVE-2022-49052](https://nvd.nist.gov/vuln/detail/CVE-2022-49052)
 漏洞归属组件：[kernel](https://gitee.com/src-openeuler/kernel)
 漏洞归属的版本：4.19.140,4.19.194,4.19.90,5.10.0,6.1.19,6.1.8,6.4.0,6.6.0
 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: fix unexpected zeroed page mapping with zram swapTwo processes under CLONE_VM cloning, user process can be corrupted byseeing zeroed page unexpectedly.      CPU A                        CPU B  do_swap_page                do_swap_page  SWP_SYNCHRONOUS_IO path     SWP_SYNCHRONOUS_IO path  swap_readpage valid data    swap_slot_free_notify      delete zram entry                              swap_readpage zeroed(invalid) data                              pte_lock                              map the *zero data* to userspace                              pte_unlock  pte_lock  if (!pte_same)    goto out_nomap;  pte_unlock  return and next refault will  read zeroed dataThe swap_slot_free_notify is bogus for CLONE_VM case since it doesn tincrease the refcount of swap slot at copy_mm so it couldn t catch upwhether it s safe or not to discard data from backing device.  In thecase, only the lock it could rely on to synchronize swap slot freeing ispage table lock.  Thus, this patch gets rid of the swap_slot_free_notifyfunction.  With this patch, CPU A will see correct data.      CPU A                        CPU B  do_swap_page                do_swap_page  SWP_SYNCHRONOUS_IO path     SWP_SYNCHRONOUS_IO path                              swap_readpage original data                              pte_lock                              map the original data                              swap_free                                swap_range_free                                  bd_disk->fops->swap_slot_free_notify  swap_readpage read zeroed data                              pte_unlock  pte_lock  if (!pte_same)    goto out_nomap;  pte_unlock  return  on next refault will see mapped data by CPU BThe concern of the patch would increase memory consumption since itcould keep wasted memory with compressed form in zram as well asuncompressed form in address space.  However, most of cases of zram usesno readahead and do_swap_page is followed by swap_free so it will freethe compressed form from in zram quickly.
 漏洞公开时间：2025-02-26 15:00:42
 漏洞创建时间：2025-02-26 15:14:10
 漏洞详情参考链接：
  https://nvd.nist.gov/vuln/detail/CVE-2022-49052
<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/12ba1d38115a101c45d8e0ca3aa1181fd148e57f |  |
| 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | https://git.kernel.org/stable/c/20ed94f8181a25212e7404e44958e234f407624b |  |
| 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | https://git.kernel.org/stable/c/afac4b88699a06c8b9369f9d759a1ec3c254b788 |  |
| 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | https://git.kernel.org/stable/c/e914d8f00391520ecc4495dd0ca0124538ab7119 |  |
| 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | https://git.kernel.org/stable/c/f098f8b9820fe3f2e41aefc4329dfe8a3859d1c1 |  |
| 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | https://git.kernel.org/stable/c/f86d55cf616199404c05f5b0c5c41b17351baa02 |  |
| suse_bugzilla | http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2022-49052 | https://bugzilla.suse.com/show_bug.cgi?id=1237917 |
| suse_bugzilla | https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2022/CVE-2022-49052.mbox | https://bugzilla.suse.com/show_bug.cgi?id=1237917 |
| suse_bugzilla | https://git.kernel.org/stable/c/f86d55cf616199404c05f5b0c5c41b17351baa02 | https://bugzilla.suse.com/show_bug.cgi?id=1237917 |
| suse_bugzilla | https://git.kernel.org/stable/c/f098f8b9820fe3f2e41aefc4329dfe8a3859d1c1 | https://bugzilla.suse.com/show_bug.cgi?id=1237917 |
| suse_bugzilla | https://git.kernel.org/stable/c/20ed94f8181a25212e7404e44958e234f407624b | https://bugzilla.suse.com/show_bug.cgi?id=1237917 |
| suse_bugzilla | https://git.kernel.org/stable/c/12ba1d38115a101c45d8e0ca3aa1181fd148e57f | https://bugzilla.suse.com/show_bug.cgi?id=1237917 |
| suse_bugzilla | https://git.kernel.org/stable/c/afac4b88699a06c8b9369f9d759a1ec3c254b788 | https://bugzilla.suse.com/show_bug.cgi?id=1237917 |
| suse_bugzilla | https://git.kernel.org/stable/c/e914d8f00391520ecc4495dd0ca0124538ab7119 | https://bugzilla.suse.com/show_bug.cgi?id=1237917 |
| suse_bugzilla | https://bugzilla.redhat.com/show_bug.cgi?id=2347838 | https://bugzilla.suse.com/show_bug.cgi?id=1237917 |
| redhat_bugzilla | https://lore.kernel.org/linux-cve-announce/2025022651-CVE-2022-49052-4ea2@gregkh/T | https://bugzilla.redhat.com/show_bug.cgi?id=2347838 |

</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>

无
</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: fix unexpected zeroed page mapping with zram swapTwo processes under CLONE_VM cloning, user process can be corrupted byseeing zeroed page unexpectedly.      CPU A                        CPU B  do_swap_page                do_swap_page  SWP_SYNCHRONOUS_IO path     SWP_SYNCHRONOUS_IO path  swap_readpage valid data    swap_slot_free_notify      delete zram entry                              swap_readpage zeroed(invalid) data                              pte_lock                              map the *zero data* to userspace                              pte_unlock  pte_lock  if (!pte_same)    goto out_nomap;  pte_unlock  return and next refault will  read zeroed dataThe swap_slot_free_notify is bogus for CLONE_VM case since it doesn tincrease the refcount of swap slot at copy_mm so it couldn t catch upwhether it s safe or not to discard data from backing device.  In thecase, only the lock it could rely on to synchronize swap slot freeing ispage table lock.  Thus, this patch gets rid of the swap_slot_free_notifyfunction.  With this patch, CPU A will see correct data.      CPU A                        CPU B  do_swap_page                do_swap_page  SWP_SYNCHRONOUS_IO path     SWP_SYNCHRONOUS_IO path                              swap_readpage original data                              pte_lock                              map the original data                              swap_free                                swap_range_free                                  bd_disk->fops->swap_slot_free_notify  swap_readpage read zeroed data                              pte_unlock  pte_lock  if (!pte_same)    goto out_nomap;  pte_unlock  return  on next refault will see mapped data by CPU BThe concern of the patch would increase memory consumption since itcould keep wasted memory with compressed form in zram as well asuncompressed form in address space.  However, most of cases of zram usesno readahead and do_swap_page is followed by swap_free so it will freethe compressed form from in zram quickly.
 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.master(6.6.0):不受影响
3.openEuler-22.03-LTS-SP3(5.10.0):不受影响
4.openEuler-22.03-LTS-SP4:不受影响
5.openEuler-24.03-LTS(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.master(6.6.0):否
2.openEuler-20.03-LTS-SP4(4.19.90):否
3.openEuler-22.03-LTS-SP3(5.10.0):否
4.openEuler-22.03-LTS-SP4:否
5.openEuler-24.03-LTS(6.6.0):否
6.openEuler-24.03-LTS-Next(6.6.0):否
7.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.master(6.6.0):不受影响-漏洞代码不能被攻击者触发
3.openEuler-22.03-LTS-SP3(5.10.0):不受影响-漏洞代码不能被攻击者触发
4.openEuler-22.03-LTS-SP4:不受影响-漏洞代码不能被攻击者触发
5.openEuler-24.03-LTS(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-漏洞代码不能被攻击者触发

三、漏洞修复
安全公告链接：https://www.openeuler.org/zh/security/safety-bulletin/detail/?id=openEuler-SA-2025-1317

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