ghsa-2g8r-g5wp-xcxp
Vulnerability from github
In the Linux kernel, the following vulnerability has been resolved:
netfs: Only call folio_start_fscache() 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 netfs_rreq_unlock_folios() to set any folios to be written back, we need to make sure we only call folio_start_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: VM_BUG_ON_FOLIO(folio_test_private_2(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:netfs_rreq_unlock_folios+0x68e/0x730 [netfs] ... Call Trace: netfs_rreq_assess+0x497/0x660 [netfs] netfs_subreq_terminated+0x32b/0x610 [netfs] nfs_netfs_read_completion+0x14e/0x1a0 [nfs] nfs_read_completion+0x2f9/0x330 [nfs] rpc_free_task+0x72/0xa0 [sunrpc] rpc_async_release+0x46/0x70 [sunrpc] process_one_work+0x3bd/0x710 worker_thread+0x89/0x610 kthread+0x181/0x1c0 ret_from_fork+0x29/0x50
{
"affected": [],
"aliases": [
"CVE-2023-52582"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2024-03-02T22:15:49Z",
"severity": null
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfs: Only call folio_start_fscache() one time for each folio\n\nIf a network filesystem using netfs implements a clamp_length()\nfunction, it can set subrequest lengths smaller than a page size.\n\nWhen we loop through the folios in netfs_rreq_unlock_folios() to\nset any folios to be written back, we need to make sure we only\ncall folio_start_fscache() once for each folio.\n\nOtherwise, this simple testcase:\n\n mount -o fsc,rsize=1024,wsize=1024 127.0.0.1:/export /mnt/nfs\n dd if=/dev/zero of=/mnt/nfs/file.bin bs=4096 count=1\n 1+0 records in\n 1+0 records out\n 4096 bytes (4.1 kB, 4.0 KiB) copied, 0.0126359 s, 324 kB/s\n echo 3 \u003e /proc/sys/vm/drop_caches\n cat /mnt/nfs/file.bin \u003e /dev/null\n\nwill trigger an oops similar to the following:\n\n page dumped because: VM_BUG_ON_FOLIO(folio_test_private_2(folio))\n ------------[ cut here ]------------\n kernel BUG at include/linux/netfs.h:44!\n ...\n CPU: 5 PID: 134 Comm: kworker/u16:5 Kdump: loaded Not tainted 6.4.0-rc5\n ...\n RIP: 0010:netfs_rreq_unlock_folios+0x68e/0x730 [netfs]\n ...\n Call Trace:\n netfs_rreq_assess+0x497/0x660 [netfs]\n netfs_subreq_terminated+0x32b/0x610 [netfs]\n nfs_netfs_read_completion+0x14e/0x1a0 [nfs]\n nfs_read_completion+0x2f9/0x330 [nfs]\n rpc_free_task+0x72/0xa0 [sunrpc]\n rpc_async_release+0x46/0x70 [sunrpc]\n process_one_work+0x3bd/0x710\n worker_thread+0x89/0x610\n kthread+0x181/0x1c0\n ret_from_fork+0x29/0x50",
"id": "GHSA-2g8r-g5wp-xcxp",
"modified": "2024-03-03T00:30:32Z",
"published": "2024-03-03T00:30:32Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2023-52582"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/d9f5537479d4ec97ea92ff24e81a517d5772581a"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/df1c357f25d808e30b216188330e708e09e1a412"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/df9950d37df113db59495fa09d060754366a2b7c"
}
],
"schema_version": "1.4.0",
"severity": []
}