Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: nfsd: prevent panic for nfsv4.0 closed files in nfs4_show_open Prior to commit 3f29cc82a84c ("nfsd: split sc_status out of sc_type") states_show() relied on sc_type field to be of valid type before calling into a subfunction to show content of a particular stateid. From that commit, we split the validity of the stateid into sc_status and no longer changed sc_type to 0 while unhashing the stateid. This resulted in kernel oopsing for nfsv4.0 opens that stay around and in nfs4_show_open() would derefence sc_file which was NULL. Instead, for closed open stateids forgo displaying information that relies of having a valid sc_file. To reproduce: mount the server with 4.0, read and close a file and then on the server cat /proc/fs/nfsd/clients/2/states [ 513.590804] Call trace: [ 513.590925] _raw_spin_lock+0xcc/0x160 [ 513.591119] nfs4_show_open+0x78/0x2c0 [nfsd] [ 513.591412] states_show+0x44c/0x488 [nfsd] [ 513.591681] seq_read_iter+0x5d8/0x760 [ 513.591896] seq_read+0x188/0x208 [ 513.592075] vfs_read+0x148/0x470 [ 513.592241] ksys_read+0xcc/0x178
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 3f29cc82a84c23cfd12b903029dd26002ca825f5 before ba0b697de298285301c71c258598226e06494236; affected 3f29cc82a84c23cfd12b903029dd26002ca825f5 before a204501e1743d695ca2930ed25a2be9f8ced96d3; affected 172d038b7c4d3cfa9fc5ac210577c5c4f8256320; affected 6.6.160 before 6.7 |
| Linux / Linux | affected 6.9; unaffected 0 before 6.9; unaffected 6.10.8 through 6.10.*; unaffected 6.11 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/ba0b697de298285301c71c258598226e06494236
- https://git.kernel.org/stable/c/a204501e1743d695ca2930ed25a2be9f8ced96d3
ADP enrichment
No English description supplied.
No references supplied.