CVE-2024-39301: net/9p: fix uninit-value in p9_client_rpc()
First published: Tue Jun 25 2024(Updated: )
In the Linux kernel, the following vulnerability has been resolved: net/9p: fix uninit-value in p9_client_rpc() Syzbot with the help of KMSAN reported the following error: BUG: KMSAN: uninit-value in trace_9p_client_res include/trace/events/9p.h:146 [inline] BUG: KMSAN: uninit-value in p9_client_rpc+0x1314/0x1340 net/9p/client.c:754 trace_9p_client_res include/trace/events/9p.h:146 [inline] p9_client_rpc+0x1314/0x1340 net/9p/client.c:754 p9_client_create+0x1551/0x1ff0 net/9p/client.c:1031 v9fs_session_init+0x1b9/0x28e0 fs/9p/v9fs.c:410 v9fs_mount+0xe2/0x12b0 fs/9p/vfs_super.c:122 legacy_get_tree+0x114/0x290 fs/fs_context.c:662 vfs_get_tree+0xa7/0x570 fs/super.c:1797 do_new_mount+0x71f/0x15e0 fs/namespace.c:3352 path_mount+0x742/0x1f20 fs/namespace.c:3679 do_mount fs/namespace.c:3692 [inline] __do_sys_mount fs/namespace.c:3898 [inline] __se_sys_mount+0x725/0x810 fs/namespace.c:3875 __x64_sys_mount+0xe4/0x150 fs/namespace.c:3875 do_syscall_64+0xd5/0x1f0 entry_SYSCALL_64_after_hwframe+0x6d/0x75 Uninit was created at: __alloc_pages+0x9d6/0xe70 mm/page_alloc.c:4598 __alloc_pages_node include/linux/gfp.h:238 [inline] alloc_pages_node include/linux/gfp.h:261 [inline] alloc_slab_page mm/slub.c:2175 [inline] allocate_slab mm/slub.c:2338 [inline] new_slab+0x2de/0x1400 mm/slub.c:2391 ___slab_alloc+0x1184/0x33d0 mm/slub.c:3525 __slab_alloc mm/slub.c:3610 [inline] __slab_alloc_node mm/slub.c:3663 [inline] slab_alloc_node mm/slub.c:3835 [inline] kmem_cache_alloc+0x6d3/0xbe0 mm/slub.c:3852 p9_tag_alloc net/9p/client.c:278 [inline] p9_client_prepare_req+0x20a/0x1770 net/9p/client.c:641 p9_client_rpc+0x27e/0x1340 net/9p/client.c:688 p9_client_create+0x1551/0x1ff0 net/9p/client.c:1031 v9fs_session_init+0x1b9/0x28e0 fs/9p/v9fs.c:410 v9fs_mount+0xe2/0x12b0 fs/9p/vfs_super.c:122 legacy_get_tree+0x114/0x290 fs/fs_context.c:662 vfs_get_tree+0xa7/0x570 fs/super.c:1797 do_new_mount+0x71f/0x15e0 fs/namespace.c:3352 path_mount+0x742/0x1f20 fs/namespace.c:3679 do_mount fs/namespace.c:3692 [inline] __do_sys_mount fs/namespace.c:3898 [inline] __se_sys_mount+0x725/0x810 fs/namespace.c:3875 __x64_sys_mount+0xe4/0x150 fs/namespace.c:3875 do_syscall_64+0xd5/0x1f0 entry_SYSCALL_64_after_hwframe+0x6d/0x75 If p9_check_errors() fails early in p9_client_rpc(), req->rc.tag will not be properly initialized. However, trace_9p_client_res() ends up trying to print it out anyway before p9_client_rpc() finishes. Fix this issue by assigning default values to p9_fcall fields such as 'tag' and (just in case KMSAN unearths something new) 'id' during the tag allocation stage.
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux Linux kernel | >=3.2<4.19.316 | |
| Linux Linux kernel | >=4.20<5.4.278 | |
| Linux Linux kernel | >=5.5<5.10.219 | |
| Linux Linux kernel | >=5.11<5.15.161 | |
| Linux Linux kernel | >=5.16<6.1.94 | |
| Linux Linux kernel | >=6.2<6.6.34 | |
| Linux Linux kernel | >=6.7<6.9.5 | |
| Linux Linux kernel | =6.10-rc1 | |
| debian/linux | 5.10.223-1 5.10.226-1 6.1.115-1 6.1.119-1 6.11.10-1 6.12.5-1 |
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Reference Links
- https://git.kernel.org/stable/c/72c5d8e416ecc46af370a1340b3db5ff0b0cc867
- https://git.kernel.org/stable/c/2101901dd58c6da4924bc5efb217a1d83436290b
- https://git.kernel.org/stable/c/124947855564572713d705a13be7d0c9dae16a17
- https://git.kernel.org/stable/c/89969ffbeb948ffc159d19252e7469490103011b
- https://git.kernel.org/stable/c/ca71f204711ad24113e8b344dc5bb8b0385f5672
- https://git.kernel.org/stable/c/6c1791130b781c843572fb6391c4a4c5d857ab17
- https://git.kernel.org/stable/c/fe5c604053c36c62af24eee8a76407d026ea5163
- https://git.kernel.org/stable/c/25460d6f39024cc3b8241b14c7ccf0d6f11a736a
- https://git.kernel.org/linus/25460d6f39024cc3b8241b14c7ccf0d6f11a736a
- https://security-tracker.debian.org/tracker/CVE-2024-39301
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-39301
- https://nvd.nist.gov/vuln/detail/CVE-2024-39301
- https://launchpad.net/bugs/cve/CVE-2024-39301
- https://ubuntu.com/security/CVE-2024-39301
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