do_sys_name_to_handle()：使用 kzalloc() 修复内核信息泄漏 (CVE-2024-26901)

CVE编号

CVE-2024-26901

利用情况

暂无

补丁情况

N/A

披露时间

2024-04-17
漏洞描述
In the Linux kernel, the following vulnerability has been resolved:

do_sys_name_to_handle(): use kzalloc() to fix kernel-infoleak

syzbot identified a kernel information leak vulnerability in
do_sys_name_to_handle() and issued the following report [1].

[1]
"BUG: KMSAN: kernel-infoleak in instrument_copy_to_user include/linux/instrumented.h:114 [inline]
BUG: KMSAN: kernel-infoleak in _copy_to_user+0xbc/0x100 lib/usercopy.c:40
instrument_copy_to_user include/linux/instrumented.h:114 [inline]
_copy_to_user+0xbc/0x100 lib/usercopy.c:40
copy_to_user include/linux/uaccess.h:191 [inline]
do_sys_name_to_handle fs/fhandle.c:73 [inline]
__do_sys_name_to_handle_at fs/fhandle.c:112 [inline]
__se_sys_name_to_handle_at+0x949/0xb10 fs/fhandle.c:94
__x64_sys_name_to_handle_at+0xe4/0x140 fs/fhandle.c:94
...

Uninit was created at:
slab_post_alloc_hook+0x129/0xa70 mm/slab.h:768
slab_alloc_node mm/slub.c:3478 [inline]
__kmem_cache_alloc_node+0x5c9/0x970 mm/slub.c:3517
__do_kmalloc_node mm/slab_common.c:1006 [inline]
__kmalloc+0x121/0x3c0 mm/slab_common.c:1020
kmalloc include/linux/slab.h:604 [inline]
do_sys_name_to_handle fs/fhandle.c:39 [inline]
__do_sys_name_to_handle_at fs/fhandle.c:112 [inline]
__se_sys_name_to_handle_at+0x441/0xb10 fs/fhandle.c:94
__x64_sys_name_to_handle_at+0xe4/0x140 fs/fhandle.c:94
...

Bytes 18-19 of 20 are uninitialized
Memory access of size 20 starts at ffff888128a46380
Data copied to user address 0000000020000240"

Per Chuck Lever's suggestion, use kzalloc() instead of kmalloc() to
solve the problem.
解决建议
建议您更新当前系统或软件至最新版，完成漏洞的修复。
参考链接
https://git.kernel.org/stable/c/3948abaa4e2be938ccdfc289385a27342fb13d43
https://git.kernel.org/stable/c/423b6bdf19bbc5e1f7e7461045099917378f7e71
https://git.kernel.org/stable/c/4bac28f441e3cc9d3f1a84c8d023228a68d8a7c1
https://git.kernel.org/stable/c/772a7def9868091da3bcb0d6c6ff9f0c03d7fa8b
https://git.kernel.org/stable/c/bf9ec1b24ab4e94345aa1c60811dd329f069c38b
https://git.kernel.org/stable/c/c1362eae861db28b1608b9dc23e49634fe87b63b
https://git.kernel.org/stable/c/cba138f1ef37ec6f961baeab62f312dedc7cf730
https://git.kernel.org/stable/c/cde76b3af247f615447bcfecf610bb76c3529126
https://git.kernel.org/stable/c/e6450d5e46a737a008b4885aa223486113bf0ad6
受影响软件情况
# 类型 厂商 产品 版本 影响面
1
运行在以下环境
系统 debian_12 linux * Up to
(excluding)
6.1.85-1
运行在以下环境
系统 linux linux_kernel * From
(including)
2.6.39 		Up to
(excluding)
4.19.311
运行在以下环境
系统 linux linux_kernel * From
(including)
4.20 		Up to
(excluding)
5.4.273
运行在以下环境
系统 linux linux_kernel * From
(including)
5.11 		Up to
(excluding)
5.15.153
运行在以下环境
系统 linux linux_kernel * From
(including)
5.16 		Up to
(excluding)
6.1.83
运行在以下环境
系统 linux linux_kernel * From
(including)
5.5 		Up to
(excluding)
5.10.214
运行在以下环境
系统 linux linux_kernel * From
(including)
6.2 		Up to
(excluding)
6.6.23
运行在以下环境
系统 linux linux_kernel * From
(including)
6.7 		Up to
(excluding)
6.7.11
运行在以下环境
系统 linux linux_kernel * From
(including)
6.8 		Up to
(excluding)
6.8.2
CVSS3评分
5.5
  • 攻击路径
    本地
  • 攻击复杂度
    低
  • 权限要求
    低
  • 影响范围
    未更改
  • 用户交互
    无
  • 可用性
    高
  • 保密性
    无
  • 完整性
    无
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CWE-ID 漏洞类型
CWE-908 对未经初始化资源的使用
阿里云安全产品覆盖情况