CVE-2023-52879

一、漏洞信息
 漏洞编号：[CVE-2023-52879](https://nvd.nist.gov/vuln/detail/CVE-2023-52879)
 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:tracing: Have trace_event_file have ref countersThe following can crash the kernel: # cd /sys/kernel/tracing # echo  p:sched schedule  > kprobe_events # exec 5>>events/kprobes/sched/enable # > kprobe_events # exec 5>&-The above commands: 1. Change directory to the tracefs directory 2. Create a kprobe event (doesn t matter what one) 3. Open bash file descriptor 5 on the enable file of the kprobe event 4. Delete the kprobe event (removes the files too) 5. Close the bash file descriptor 5The above causes a crash! BUG: kernel NULL pointer dereference, address: 0000000000000028 #PF: supervisor read access in kernel mode #PF: error_code(0x0000) - not-present page PGD 0 P4D 0 Oops: 0000 [#1] PREEMPT SMP PTI CPU: 6 PID: 877 Comm: bash Not tainted 6.5.0-rc4-test-00008-g2c6b6b1029d4-dirty #186 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014 RIP: 0010:tracing_release_file_tr+0xc/0x50What happens here is that the kprobe event creates a trace_event_file file  descriptor that represents the file in tracefs to the event. Itmaintains state of the event (is it enabled for the given instance?).Opening the  enable  file gets a reference to the event  file  descriptorvia the open file descriptor. When the kprobe event is deleted, the file isalso deleted from the tracefs system which also frees the event  file descriptor.But as the tracefs file is still opened by user space, it will not betotally removed until the final dput() is called on it. But this is nottrue with the event  file  descriptor that is already freed. If the userdoes a write to or simply closes the file descriptor it will reference theevent  file  descriptor that was just freed, causing a use-after-free bug.To solve this, add a ref count to the event  file  descriptor as well as anew flag called  FREED . The  file  will not be freed until the lastreference is released. But the FREE flag will be set when the event isremoved to prevent any more modifications to that event from happening,even if there s still a reference to the event  file  descriptor.
 漏洞公开时间：2024-05-22 00:15:24
 漏洞创建时间：2024-05-22 16:44:11
 漏洞详情参考链接：
  https://nvd.nist.gov/vuln/detail/CVE-2023-52879
<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/2c9de867ca285c397cd71af703763fe416265706 |  |
| 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | https://git.kernel.org/stable/c/2fa74d29fc1899c237d51bf9a6e132ea5c488976 |  |
| 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | https://git.kernel.org/stable/c/9034c87d61be8cff989017740a91701ac8195a1d |  |
| 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | https://git.kernel.org/stable/c/961c4511c7578d6b8f39118be919016ec3db1c1e |  |
| 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | https://git.kernel.org/stable/c/a98172e36e5f1b3d29ad71fade2d611cfcc2fe6f |  |
| 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | https://git.kernel.org/stable/c/bb32500fb9b78215e4ef6ee8b4345c5f5d7eafb4 |  |
| 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | https://git.kernel.org/stable/c/cbc7c29dff0fa18162f2a3889d82eeefd67305e0 |  |
| suse_bugzilla | http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2023-52879 | https://bugzilla.suse.com/show_bug.cgi?id=1225101 |
| suse_bugzilla | https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2023/CVE-2023-52879.mbox | https://bugzilla.suse.com/show_bug.cgi?id=1225101 |
| suse_bugzilla | https://git.kernel.org/stable/c/961c4511c7578d6b8f39118be919016ec3db1c1e | https://bugzilla.suse.com/show_bug.cgi?id=1225101 |
| suse_bugzilla | https://git.kernel.org/stable/c/a98172e36e5f1b3d29ad71fade2d611cfcc2fe6f | https://bugzilla.suse.com/show_bug.cgi?id=1225101 |
| suse_bugzilla | https://git.kernel.org/stable/c/cbc7c29dff0fa18162f2a3889d82eeefd67305e0 | https://bugzilla.suse.com/show_bug.cgi?id=1225101 |
| suse_bugzilla | https://git.kernel.org/stable/c/2fa74d29fc1899c237d51bf9a6e132ea5c488976 | https://bugzilla.suse.com/show_bug.cgi?id=1225101 |
| suse_bugzilla | https://git.kernel.org/stable/c/2c9de867ca285c397cd71af703763fe416265706 | https://bugzilla.suse.com/show_bug.cgi?id=1225101 |
| suse_bugzilla | https://git.kernel.org/stable/c/9034c87d61be8cff989017740a91701ac8195a1d | https://bugzilla.suse.com/show_bug.cgi?id=1225101 |
| suse_bugzilla | https://git.kernel.org/stable/c/bb32500fb9b78215e4ef6ee8b4345c5f5d7eafb4 | https://bugzilla.suse.com/show_bug.cgi?id=1225101 |
| suse_bugzilla | https://www.cve.org/CVERecord?id=CVE-2023-52879 | https://bugzilla.suse.com/show_bug.cgi?id=1225101 |
| redhat_bugzilla | https://lore.kernel.org/linux-cve-announce/2024052122-CVE-2023-52879-fa4d@gregkh/T | https://bugzilla.redhat.com/show_bug.cgi?id=2282730 |
| ubuntu | https://www.cve.org/CVERecord?id=CVE-2023-52879 | https://ubuntu.com/security/CVE-2023-52879 |
| ubuntu | https://git.kernel.org/linus/bb32500fb9b78215e4ef6ee8b4345c5f5d7eafb4 (6.7-rc1) | https://ubuntu.com/security/CVE-2023-52879 |
| ubuntu | https://git.kernel.org/stable/c/961c4511c7578d6b8f39118be919016ec3db1c1e | https://ubuntu.com/security/CVE-2023-52879 |
| ubuntu | https://git.kernel.org/stable/c/a98172e36e5f1b3d29ad71fade2d611cfcc2fe6f | https://ubuntu.com/security/CVE-2023-52879 |
| ubuntu | https://git.kernel.org/stable/c/cbc7c29dff0fa18162f2a3889d82eeefd67305e0 | https://ubuntu.com/security/CVE-2023-52879 |
| ubuntu | https://git.kernel.org/stable/c/2fa74d29fc1899c237d51bf9a6e132ea5c488976 | https://ubuntu.com/security/CVE-2023-52879 |
| ubuntu | https://git.kernel.org/stable/c/2c9de867ca285c397cd71af703763fe416265706 | https://ubuntu.com/security/CVE-2023-52879 |
| ubuntu | https://git.kernel.org/stable/c/9034c87d61be8cff989017740a91701ac8195a1d | https://ubuntu.com/security/CVE-2023-52879 |
| ubuntu | https://git.kernel.org/stable/c/bb32500fb9b78215e4ef6ee8b4345c5f5d7eafb4 | https://ubuntu.com/security/CVE-2023-52879 |
| ubuntu | https://nvd.nist.gov/vuln/detail/CVE-2023-52879 | https://ubuntu.com/security/CVE-2023-52879 |
| ubuntu | https://launchpad.net/bugs/cve/CVE-2023-52879 | https://ubuntu.com/security/CVE-2023-52879 |
| ubuntu | https://security-tracker.debian.org/tracker/CVE-2023-52879 | https://ubuntu.com/security/CVE-2023-52879 |
| debian |  | https://security-tracker.debian.org/tracker/CVE-2023-52879 |
| anolis |  | https://anas.openanolis.cn/cves/detail/CVE-2023-52879 |

</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/bb32500fb9b78215e4ef6ee8b4345c5f5d7eafb4 | https://git.kernel.org/linus/f5ca233e2e66dc1c249bf07eefa37e34a6c9346a | ubuntu |
| linux |  | https://git.kernel.org/linus/9034c87d61be8cff989017740a91701ac8195a1d | https://git.kernel.org/linus/f5ca233e2e66dc1c249bf07eefa37e34a6c9346a | 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:tracing: Have trace_event_file have ref countersThe following can crash the kernel: # cd /sys/kernel/tracing # echo  p:sched schedule  > kprobe_events # exec 5>>events/kprobes/sched/enable # > kprobe_events # exec 5>&-The above commands: 1. Change directory to the tracefs directory 2. Create a kprobe event (doesn t matter what one) 3. Open bash file descriptor 5 on the enable file of the kprobe event 4. Delete the kprobe event (removes the files too) 5. Close the bash file descriptor 5The above causes a crash! BUG: kernel NULL pointer dereference, address: 0000000000000028 #PF: supervisor read access in kernel mode #PF: error_code(0x0000) - not-present page PGD 0 P4D 0 Oops: 0000 [#1] PREEMPT SMP PTI CPU: 6 PID: 877 Comm: bash Not tainted 6.5.0-rc4-test-00008-g2c6b6b1029d4-dirty #186 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014 RIP: 0010:tracing_release_file_tr+0xc/0x50What happens here is that the kprobe event creates a trace_event_file file  descriptor that represents the file in tracefs to the event. Itmaintains state of the event (is it enabled for the given instance?).Opening the  enable  file gets a reference to the event  file  descriptorvia the open file descriptor. When the kprobe event is deleted, the file isalso deleted from the tracefs system which also frees the event  file descriptor.But as the tracefs file is still opened by user space, it will not betotally removed until the final dput() is called on it. But this is nottrue with the event  file  descriptor that is already freed. If the userdoes a write to or simply closes the file descriptor it will reference theevent  file  descriptor that was just freed, causing a use-after-free bug.To solve this, add a ref count to the event  file  descriptor as well as anew flag called  FREED . The  file  will not be freed until the lastreference is released. But the FREE flag will be set when the event isremoved to prevent any more modifications to that event from happening,even if there s still a reference to the event  file  descriptor. 
 openEuler评分：
  4.4
 Vector：CVSS：3.0/AV:L/AC:L/PR:H/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-22.03-LTS-SP1(5.10.0):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-20.03-LTS-SP4(4.19.90):不受影响
5.master(6.6.0):不受影响
6.openEuler-24.03-LTS(6.6.0):不受影响
7.openEuler-24.03-LTS-Next(6.6.0):不受影响
8.openEuler-24.03-LTS-SP2(6.6.0):

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-SP2(6.6.0):

原因说明：
  1.master(6.6.0):
2.openEuler-20.03-LTS-SP4(4.19.90):
3.openEuler-22.03-LTS-SP3(5.10.0):
4.openEuler-22.03-LTS-SP4(5.10.0):
5.openEuler-24.03-LTS(6.6.0):
6.openEuler-24.03-LTS-Next(6.6.0):
7.openEuler-24.03-LTS-SP1(6.6.0):
8.openEuler-24.03-LTS-SP2(6.6.0):

Hi openeuler-ci-bot, welcome to the openEuler Community.
I'm the Bot here serving you. You can find the instructions on how to interact with me at Here.
If you have any questions, please contact the SIG: Kernel, and any of the maintainers.

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**issue处理注意事项:** 
**1. 当前issue受影响的分支提交pr时, 须在pr描述中填写当前issue编号进行关联, 否则无法关闭当前issue;**
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************************************************************************
影响性分析说明:

openEuler评分: (评分和向量)

受影响版本排查(受影响/不受影响): 
1.master(6.1.0):
2.openEuler-20.03-LTS-SP1(4.19.90):
3.openEuler-20.03-LTS-SP4(4.19.90):
4.openEuler-22.03-LTS(5.10.0):
5.openEuler-22.03-LTS-Next(5.10.0):
6.openEuler-22.03-LTS-SP1(5.10.0):
7.openEuler-22.03-LTS-SP2(5.10.0):
8.openEuler-22.03-LTS-SP3(5.10.0):
9.openEuler-22.03-LTS-SP4:
10.openEuler-24.03-LTS:
11.openEuler-24.03-LTS-Next:

修复是否涉及abi变化(是/否)：
1.master(6.1.0):
2.openEuler-20.03-LTS-SP1(4.19.90):
3.openEuler-20.03-LTS-SP4(4.19.90):
4.openEuler-22.03-LTS(5.10.0):
5.openEuler-22.03-LTS-Next(5.10.0):
6.openEuler-22.03-LTS-SP1(5.10.0):
7.openEuler-22.03-LTS-SP2(5.10.0):
8.openEuler-22.03-LTS-SP3(5.10.0):
9.openEuler-22.03-LTS-SP4:
10.openEuler-24.03-LTS:
11.openEuler-24.03-LTS-Next:

-----------------------------------------------------------------------
issue处理具体操作请参考: 
https://gitee.com/openeuler/cve-manager/blob/master/cve-vulner-manager/doc/md/manual.md
pr关联issue具体操作请参考:
https://gitee.com/help/articles/4142

参考网址	关联pr	状态	补丁链接
https://nvd.nist.gov/vuln/detail/CVE-2023-52879	None	None	https://git.kernel.org/stable/c/bb32500fb9b78215e4ef6ee8b4345c5f5d7eafb4 https://git.kernel.org/stable/c/9034c87d61be8cff989017740a91701ac8195a1d https://git.kernel.org/stable/c/a98172e36e5f1b3d29ad71fade2d611cfcc2fe6f https://git.kernel.org/stable/c/2fa74d29fc1899c237d51bf9a6e132ea5c488976 https://git.kernel.org/stable/c/2c9de867ca285c397cd71af703763fe416265706 https://git.kernel.org/stable/c/cbc7c29dff0fa18162f2a3889d82eeefd67305e0 https://git.kernel.org/stable/c/961c4511c7578d6b8f39118be919016ec3db1c1e
https://www.opencve.io/cve/CVE-2023-52879	None	None	https://git.kernel.org/stable/c/bb32500fb9b78215e4ef6ee8b4345c5f5d7eafb4 https://git.kernel.org/stable/c/9034c87d61be8cff989017740a91701ac8195a1d https://git.kernel.org/stable/c/a98172e36e5f1b3d29ad71fade2d611cfcc2fe6f https://git.kernel.org/stable/c/2fa74d29fc1899c237d51bf9a6e132ea5c488976 https://git.kernel.org/stable/c/2c9de867ca285c397cd71af703763fe416265706 https://git.kernel.org/stable/c/cbc7c29dff0fa18162f2a3889d82eeefd67305e0 https://git.kernel.org/stable/c/961c4511c7578d6b8f39118be919016ec3db1c1e
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2023-52879
https://security-tracker.debian.org/tracker/CVE-2023-52879	None	None	https://git.kernel.org/linus/bb32500fb9b78215e4ef6ee8b4345c5f5d7eafb4

说明：补丁链接仅供初步排查参考，实际可用性请人工再次确认，补丁下载验证可使用CVE补丁工具。
若补丁不准确，烦请在此issue下评论 '/report-patch 参考网址补丁链接1,补丁链接2' 反馈正确信息，便于我们不断优化工具，不胜感激。
如 /report-patch https://security-tracker.debian.org/tracker/CVE-2021-3997 https://github.com/systemd/systemd/commit/5b1cf7a9be37e20133c0208005274ce4a5b5c6a1

CVE-2023-52879

影响性分析说明：
In the Linux kernel, the following vulnerability has been resolved:

tracing: Have trace_event_file have ref counters

The following can crash the kernel:

# cd /sys/kernel/tracing
 # echo 'p:sched schedule' > kprobe_events
 # exec 5>>events/kprobes/sched/enable
 # > kprobe_events
 # exec 5>&-

The above commands:

1. Change directory to the tracefs directory
 2. Create a kprobe event (doesn't matter what one)
 3. Open bash file descriptor 5 on the enable file of the kprobe event
 4. Delete the kprobe event (removes the files too)
 5. Close the bash file descriptor 5

The above causes a crash!

BUG: kernel NULL pointer dereference, address: 0000000000000028
 #PF: supervisor read access in kernel mode
 #PF: error_code(0x0000) - not-present page
 PGD 0 P4D 0
 Oops: 0000 [#1] PREEMPT SMP PTI
 CPU: 6 PID: 877 Comm: bash Not tainted 6.5.0-rc4-test-00008-g2c6b6b1029d4-dirty #186
 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
 RIP: 0010:tracing_release_file_tr+0xc/0x50

What happens here is that the kprobe event creates a trace_event_file
"file" descriptor that represents the file in tracefs to the event. It
maintains state of the event (is it enabled for the given instance?).
Opening the "enable" file gets a reference to the event "file" descriptor
via the open file descriptor. When the kprobe event is deleted, the file is
also deleted from the tracefs system which also frees the event "file"
descriptor.

But as the tracefs file is still opened by user space, it will not be
totally removed until the final dput() is called on it. But this is not
true with the event "file" descriptor that is already freed. If the user
does a write to or simply closes the file descriptor it will reference the
event "file" descriptor that was just freed, causing a use-after-free bug.

To solve this, add a ref count to the event "file" descriptor as well as a
new flag called "FREED". The "file" will not be freed until the last
reference is released. But the FREE flag will be set when the event is
removed to prevent any more modifications to that event from happening,
even if there's still a reference to the event "file" descriptor.

openEuler评分:(评分和向量)
0
CVSS: 3.0/AV:L/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:N

受影响版本排查(受影响/不受影响):
1.openEuler-20.03-LTS-SP1:不受影响
2.openEuler-20.03-LTS-SP4:不受影响
3.openEuler-22.03-LTS:受影响
4.openEuler-22.03-LTS-SP1:受影响
5.openEuler-22.03-LTS-SP2:受影响
6.openEuler-22.03-LTS-SP3:受影响
7.master(6.1.0):不受影响
8.openEuler-22.03-LTS-Next:不受影响
9.openEuler-24.03-LTS:不受影响
10.openEuler-24.03-LTS-Next:不受影响

修复是否涉及abi变化(是/否)：
1.openEuler-20.03-LTS-SP1(4.19.90):否
2.openEuler-20.03-LTS-SP4:否
3.openEuler-22.03-LTS:否
4.openEuler-22.03-LTS-SP1:否
5.openEuler-22.03-LTS-SP2:否
6.openEuler-22.03-LTS-SP3:否
7.master(6.1.0):否
8.openEuler-22.03-LTS-Next:否
9.openEuler-24.03-LTS:否
10.openEuler-24.03-LTS-Next:否

CVE-2023-52879

影响性分析说明：
In the Linux kernel, the following vulnerability has been resolved:

tracing: Have trace_event_file have ref counters

The following can crash the kernel:

# cd /sys/kernel/tracing
 # echo 'p:sched schedule' > kprobe_events
 # exec 5>>events/kprobes/sched/enable
 # > kprobe_events
 # exec 5>&-

The above commands:

1. Change directory to the tracefs directory
 2. Create a kprobe event (doesn't matter what one)
 3. Open bash file descriptor 5 on the enable file of the kprobe event
 4. Delete the kprobe event (removes the files too)
 5. Close the bash file descriptor 5

The above causes a crash!

BUG: kernel NULL pointer dereference, address: 0000000000000028
 #PF: supervisor read access in kernel mode
 #PF: error_code(0x0000) - not-present page
 PGD 0 P4D 0
 Oops: 0000 [#1] PREEMPT SMP PTI
 CPU: 6 PID: 877 Comm: bash Not tainted 6.5.0-rc4-test-00008-g2c6b6b1029d4-dirty #186
 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
 RIP: 0010:tracing_release_file_tr+0xc/0x50

What happens here is that the kprobe event creates a trace_event_file
"file" descriptor that represents the file in tracefs to the event. It
maintains state of the event (is it enabled for the given instance?).
Opening the "enable" file gets a reference to the event "file" descriptor
via the open file descriptor. When the kprobe event is deleted, the file is
also deleted from the tracefs system which also frees the event "file"
descriptor.

But as the tracefs file is still opened by user space, it will not be
totally removed until the final dput() is called on it. But this is not
true with the event "file" descriptor that is already freed. If the user
does a write to or simply closes the file descriptor it will reference the
event "file" descriptor that was just freed, causing a use-after-free bug.

To solve this, add a ref count to the event "file" descriptor as well as a
new flag called "FREED". The "file" will not be freed until the last
reference is released. But the FREE flag will be set when the event is
removed to prevent any more modifications to that event from happening,
even if there's still a reference to the event "file" descriptor.

openEuler评分:(评分和向量)
4.4
CVSS:3.1/AV:L/AC:L/PR:H/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:不受影响
2.openEuler-22.03-LTS-SP1:受影响
3.openEuler-22.03-LTS-SP3:受影响
4.openEuler-22.03-LTS-SP4:受影响
5.master(6.1.0):不受影响
6.openEuler-24.03-LTS:不受影响
7.openEuler-24.03-LTS-Next:不受影响

修复是否涉及abi变化(是/否)：
1.openEuler-20.03-LTS-SP4:否
2.openEuler-22.03-LTS-SP1:否
3.openEuler-22.03-LTS-SP3:否
4.master(6.1.0):否
5.openEuler-24.03-LTS:否
6.openEuler-24.03-LTS-Next:否
7.openEuler-22.03-LTS-SP4:否

===========================================================

CVE-2023-52879

影响性分析说明：
In the Linux kernel, the following vulnerability has been resolved:

tracing: Have trace_event_file have ref counters

The following can crash the kernel:

# cd /sys/kernel/tracing
 # echo 'p:sched schedule' > kprobe_events
 # exec 5>>events/kprobes/sched/enable
 # > kprobe_events
 # exec 5>&-

The above commands:

1. Change directory to the tracefs directory
 2. Create a kprobe event (doesn't matter what one)
 3. Open bash file descriptor 5 on the enable file of the kprobe event
 4. Delete the kprobe event (removes the files too)
 5. Close the bash file descriptor 5

The above causes a crash!

BUG: kernel NULL pointer dereference, address: 0000000000000028
 #PF: supervisor read access in kernel mode
 #PF: error_code(0x0000) - not-present page
 PGD 0 P4D 0
 Oops: 0000 [#1] PREEMPT SMP PTI
 CPU: 6 PID: 877 Comm: bash Not tainted 6.5.0-rc4-test-00008-g2c6b6b1029d4-dirty #186
 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
 RIP: 0010:tracing_release_file_tr+0xc/0x50

What happens here is that the kprobe event creates a trace_event_file
"file" descriptor that represents the file in tracefs to the event. It
maintains state of the event (is it enabled for the given instance?).
Opening the "enable" file gets a reference to the event "file" descriptor
via the open file descriptor. When the kprobe event is deleted, the file is
also deleted from the tracefs system which also frees the event "file"
descriptor.

But as the tracefs file is still opened by user space, it will not be
totally removed until the final dput() is called on it. But this is not
true with the event "file" descriptor that is already freed. If the user
does a write to or simply closes the file descriptor it will reference the
event "file" descriptor that was just freed, causing a use-after-free bug.

To solve this, add a ref count to the event "file" descriptor as well as a
new flag called "FREED". The "file" will not be freed until the last
reference is released. But the FREE flag will be set when the event is
removed to prevent any more modifications to that event from happening,
even if there's still a reference to the event "file" descriptor.

openEuler评分:(评分和向量)
4.4
CVSS:3.1/AV:L/AC:L/PR:H/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:不受影响
2.openEuler-22.03-LTS-SP1:受影响
3.openEuler-22.03-LTS-SP3:受影响
4.openEuler-22.03-LTS-SP4:受影响
5.master(6.1.0):不受影响
6.openEuler-24.03-LTS:不受影响
7.openEuler-24.03-LTS-Next:不受影响

修复是否涉及abi变化(是/否)：
1.openEuler-20.03-LTS-SP4:否
2.openEuler-22.03-LTS-SP1:否
3.openEuler-22.03-LTS-SP3:否
4.master(6.1.0):否
5.openEuler-24.03-LTS:否
6.openEuler-24.03-LTS-Next:否
7.openEuler-22.03-LTS-SP4:否

===========================================================

@sanglipeng 经过 cve-manager 解析, 已分析的内容如下表所示:
| 状态  | 需分析 | 内容 |
|:--:|:--:|---------|
|已分析|1.影响性分析说明|In the Linux kernel, the following vulnerability has been resolved:tracing: Have trace_event_file have ref countersThe following can crash the kernel: # cd /sys/kernel/tracing # echo 'p:sched schedule' > kprobe_events # exec 5>>events/kprobes/sched/enable # > kprobe_events # exec 5>&-The above commands: 1. Change directory to the tracefs directory 2. Create a kprobe event (doesn't matter what one) 3. Open bash file descriptor 5 on the enable file of the kprobe event 4. Delete the kprobe event (removes the files too) 5. Close the bash file descriptor 5The above causes a crash! BUG: kernel NULL pointer dereference, address: 0000000000000028 #PF: supervisor read access in kernel mode #PF: error_code(0x0000) - not-present page PGD 0 P4D 0 Oops: 0000 [#1] PREEMPT SMP PTI CPU: 6 PID: 877 Comm: bash Not tainted 6.5.0-rc4-test-00008-g2c6b6b1029d4-dirty #186 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014 RIP: 0010:tracing_release_file_tr+0xc/0x50What happens here is that the kprobe event creates a trace_event_file"file" descriptor that represents the file in tracefs to the event. Itmaintains state of the event (is it enabled for the given instance?).Opening the "enable" file gets a reference to the event "file" descriptorvia the open file descriptor. When the kprobe event is deleted, the file isalso deleted from the tracefs system which also frees the event "file"descriptor.But as the tracefs file is still opened by user space, it will not betotally removed until the final dput() is called on it. But this is nottrue with the event "file" descriptor that is already freed. If the userdoes a write to or simply closes the file descriptor it will reference theevent "file" descriptor that was just freed, causing a use-after-free bug.To solve this, add a ref count to the event "file" descriptor as well as anew flag called "FREED". The "file" will not be freed until the lastreference is released. But the FREE flag will be set when the event isremoved to prevent any more modifications to that event from happening,even if there's still a reference to the event "file" descriptor.|
|已分析|2.openEulerScore|4.4|
|已分析|3.openEulerVector|AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H|
|已分析|4.受影响版本排查|openEuler-22.03-LTS-SP1:受影响,openEuler-22.03-LTS-SP3:受影响,openEuler-22.03-LTS-SP4:受影响,openEuler-20.03-LTS-SP4:不受影响,master:不受影响,openEuler-24.03-LTS:不受影响,openEuler-24.03-LTS-Next:不受影响|
|已分析|5.修复是否涉及abi变化|openEuler-20.03-LTS-SP4:否,openEuler-22.03-LTS-SP1:否,openEuler-22.03-LTS-SP3:否,master:否,openEuler-24.03-LTS:否,openEuler-24.03-LTS-Next:否,openEuler-22.03-LTS-SP4:否|

**请确认分析内容的准确性, 确认无误后, 您可以进行后续步骤, 否则您可以继续分析.**

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CVE-2023-52879

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