CVE-2023-52582
- Source
- https://nvd.nist.gov/vuln/detail/CVE-2023-52582
- Import Source
- https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2023-52582.json
- JSON Data
- https://api.test.osv.dev/v1/vulns/CVE-2023-52582
- Downstream
- Related
- Published
- 2024-03-02T21:59:48Z
- Modified
- 2025-10-14T07:29:41.247436Z
- Summary
- netfs: Only call folio_start_fscache() one time for each folio
- Details
-
In the Linux kernel, the following vulnerability has been resolved:
netfs: Only call foliostartfscache() one time for each folio
If a network filesystem using netfs implements a clamp_length() function, it can set subrequest lengths smaller than a page size.
When we loop through the folios in netfsrrequnlockfolios() to set any folios to be written back, we need to make sure we only call foliostart_fscache() once for each folio.
Otherwise, this simple testcase:
mount -o fsc,rsize=1024,wsize=1024 127.0.0.1:/export /mnt/nfs dd if=/dev/zero of=/mnt/nfs/file.bin bs=4096 count=1 1+0 records in 1+0 records out 4096 bytes (4.1 kB, 4.0 KiB) copied, 0.0126359 s, 324 kB/s echo 3 > /proc/sys/vm/drop_caches cat /mnt/nfs/file.bin > /dev/null
will trigger an oops similar to the following:
page dumped because: VMBUGONFOLIO(foliotestprivate2(folio)) ------------[ cut here ]------------ kernel BUG at include/linux/netfs.h:44! ... CPU: 5 PID: 134 Comm: kworker/u16:5 Kdump: loaded Not tainted 6.4.0-rc5 ... RIP: 0010:netfsrrequnlockfolios+0x68e/0x730 [netfs] ... Call Trace: netfsrreqassess+0x497/0x660 [netfs] netfssubreqterminated+0x32b/0x610 [netfs] nfsnetfsreadcompletion+0x14e/0x1a0 [nfs] nfsreadcompletion+0x2f9/0x330 [nfs] rpcfreetask+0x72/0xa0 [sunrpc] rpcasyncrelease+0x46/0x70 [sunrpc] processonework+0x3bd/0x710 workerthread+0x89/0x610 kthread+0x181/0x1c0 retfrom_fork+0x29/0x50
- References
Affected packages
Git / git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Affected ranges
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduced3d3c95046742e4eebaa4b891b0b01cbbed94ebbdFixeddf9950d37df113db59495fa09d060754366a2b7c
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduced3d3c95046742e4eebaa4b891b0b01cbbed94ebbdFixedd9f5537479d4ec97ea92ff24e81a517d5772581a
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduced3d3c95046742e4eebaa4b891b0b01cbbed94ebbdFixeddf1c357f25d808e30b216188330e708e09e1a412