CVE-2024-26901: do_sys_name_to_handle(): use kzalloc() to fix kernel-infoleak
First published: Wed Apr 17 2024(Updated: )
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.
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| redhat/kernel | <4.19.311 | 4.19.311 |
| redhat/kernel | <5.4.273 | 5.4.273 |
| redhat/kernel | <5.10.214 | 5.10.214 |
| redhat/kernel | <5.15.153 | 5.15.153 |
| redhat/kernel | <6.1.83 | 6.1.83 |
| redhat/kernel | <6.6.23 | 6.6.23 |
| redhat/kernel | <6.7.11 | 6.7.11 |
| redhat/kernel | <6.8.2 | 6.8.2 |
| redhat/kernel | <6.9 | 6.9 |
| Linux Linux kernel | >=2.6.39<4.19.311 | |
| Linux Linux kernel | >=4.20<5.4.273 | |
| Linux Linux kernel | >=5.5<5.10.214 | |
| Linux Linux kernel | >=5.11<5.15.153 | |
| Linux Linux kernel | >=5.16<6.1.83 | |
| Linux Linux kernel | >=6.2<6.6.23 | |
| Linux Linux kernel | >=6.7<6.7.11 | |
| Linux Linux kernel | >=6.8<6.8.2 | |
| debian/linux | 5.10.223-1 5.10.226-1 6.1.115-1 6.1.112-1 6.11.5-1 6.11.7-1 |
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Reference Links
- 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
- https://launchpad.net/bugs/cve/CVE-2024-26901
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-26901
- https://nvd.nist.gov/vuln/detail/CVE-2024-26901
- https://security-tracker.debian.org/tracker/CVE-2024-26901
- https://ubuntu.com/security/CVE-2024-26901
- https://git.kernel.org/linus/3948abaa4e2be938ccdfc289385a27342fb13d43
- https://access.redhat.com/security/cve/CVE-2024-26901
- https://lore.kernel.org/linux-cve-announce/2024041745-CVE-2024-26901-34e7@gregkh/T
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=2275646
- https://access.redhat.com/errata/RHSA-2024:3618
- https://access.redhat.com/errata/RHSA-2024:3627
- https://access.redhat.com/errata/RHSA-2024:9315
- https://bugzilla.redhat.com/show_bug.cgi?id=2275645
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