{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2022-48920","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2024-08-21T06:06:23.295Z","datePublished":"2024-08-22T01:32:50.796Z","dateUpdated":"2025-12-23T13:21:08.828Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2025-12-23T13:21:08.828Z"},"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: get rid of warning on transaction commit when using flushoncommit\n\nWhen using the flushoncommit mount option, during almost every transaction\ncommit we trigger a warning from __writeback_inodes_sb_nr():\n\n  $ cat fs/fs-writeback.c:\n  (...)\n  static void __writeback_inodes_sb_nr(struct super_block *sb, ...\n  {\n        (...)\n        WARN_ON(!rwsem_is_locked(&sb->s_umount));\n        (...)\n  }\n  (...)\n\nThe trace produced in dmesg looks like the following:\n\n  [947.473890] WARNING: CPU: 5 PID: 930 at fs/fs-writeback.c:2610 __writeback_inodes_sb_nr+0x7e/0xb3\n  [947.481623] Modules linked in: nfsd nls_cp437 cifs asn1_decoder cifs_arc4 fscache cifs_md4 ipmi_ssif\n  [947.489571] CPU: 5 PID: 930 Comm: btrfs-transacti Not tainted 95.16.3-srb-asrock-00001-g36437ad63879 #186\n  [947.497969] RIP: 0010:__writeback_inodes_sb_nr+0x7e/0xb3\n  [947.502097] Code: 24 10 4c 89 44 24 18 c6 (...)\n  [947.519760] RSP: 0018:ffffc90000777e10 EFLAGS: 00010246\n  [947.523818] RAX: 0000000000000000 RBX: 0000000000963300 RCX: 0000000000000000\n  [947.529765] RDX: 0000000000000000 RSI: 000000000000fa51 RDI: ffffc90000777e50\n  [947.535740] RBP: ffff888101628a90 R08: ffff888100955800 R09: ffff888100956000\n  [947.541701] R10: 0000000000000002 R11: 0000000000000001 R12: ffff888100963488\n  [947.547645] R13: ffff888100963000 R14: ffff888112fb7200 R15: ffff888100963460\n  [947.553621] FS:  0000000000000000(0000) GS:ffff88841fd40000(0000) knlGS:0000000000000000\n  [947.560537] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n  [947.565122] CR2: 0000000008be50c4 CR3: 000000000220c000 CR4: 00000000001006e0\n  [947.571072] Call Trace:\n  [947.572354]  <TASK>\n  [947.573266]  btrfs_commit_transaction+0x1f1/0x998\n  [947.576785]  ? start_transaction+0x3ab/0x44e\n  [947.579867]  ? schedule_timeout+0x8a/0xdd\n  [947.582716]  transaction_kthread+0xe9/0x156\n  [947.585721]  ? btrfs_cleanup_transaction.isra.0+0x407/0x407\n  [947.590104]  kthread+0x131/0x139\n  [947.592168]  ? set_kthread_struct+0x32/0x32\n  [947.595174]  ret_from_fork+0x22/0x30\n  [947.597561]  </TASK>\n  [947.598553] ---[ end trace 644721052755541c ]---\n\nThis is because we started using writeback_inodes_sb() to flush delalloc\nwhen committing a transaction (when using -o flushoncommit), in order to\navoid deadlocks with filesystem freeze operations. This change was made\nby commit ce8ea7cc6eb313 (\"btrfs: don't call btrfs_start_delalloc_roots\nin flushoncommit\"). After that change we started producing that warning,\nand every now and then a user reports this since the warning happens too\noften, it spams dmesg/syslog, and a user is unsure if this reflects any\nproblem that might compromise the filesystem's reliability.\n\nWe can not just lock the sb->s_umount semaphore before calling\nwriteback_inodes_sb(), because that would at least deadlock with\nfilesystem freezing, since at fs/super.c:freeze_super() sync_filesystem()\nis called while we are holding that semaphore in write mode, and that can\ntrigger a transaction commit, resulting in a deadlock. It would also\ntrigger the same type of deadlock in the unmount path. Possibly, it could\nalso introduce some other locking dependencies that lockdep would report.\n\nTo fix this call try_to_writeback_inodes_sb() instead of\nwriteback_inodes_sb(), because that will try to read lock sb->s_umount\nand then will only call writeback_inodes_sb() if it was able to lock it.\nThis is fine because the cases where it can't read lock sb->s_umount\nare during a filesystem unmount or during a filesystem freeze - in those\ncases sb->s_umount is write locked and sync_filesystem() is called, which\ncalls writeback_inodes_sb(). In other words, in all cases where we can't\ntake a read lock on sb->s_umount, writeback is already being triggered\nelsewhere.\n\nAn alternative would be to call btrfs_start_delalloc_roots() with a\nnumber of pages different from LONG_MAX, for example matching the number\nof delalloc bytes we currently have, in \n---truncated---"}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/btrfs/transaction.c"],"versions":[{"version":"ce8ea7cc6eb3139f4c730d647325e69354159b0f","lessThan":"850a77c999b81dd2724efd2684068d6f90db8c16","status":"affected","versionType":"git"},{"version":"ce8ea7cc6eb3139f4c730d647325e69354159b0f","lessThan":"e4d044dbffcd570351f21c747fc77ff90aed7f2e","status":"affected","versionType":"git"},{"version":"ce8ea7cc6eb3139f4c730d647325e69354159b0f","lessThan":"a0f0cf8341e34e5d2265bfd3a7ad68342da1e2aa","status":"affected","versionType":"git"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"affected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/btrfs/transaction.c"],"versions":[{"version":"4.15","status":"affected"},{"version":"0","lessThan":"4.15","status":"unaffected","versionType":"semver"},{"version":"5.15.27","lessThanOrEqual":"5.15.*","status":"unaffected","versionType":"semver"},{"version":"5.16.13","lessThanOrEqual":"5.16.*","status":"unaffected","versionType":"semver"},{"version":"5.17","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.15","versionEndExcluding":"5.15.27"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.15","versionEndExcluding":"5.16.13"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.15","versionEndExcluding":"5.17"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/850a77c999b81dd2724efd2684068d6f90db8c16"},{"url":"https://git.kernel.org/stable/c/e4d044dbffcd570351f21c747fc77ff90aed7f2e"},{"url":"https://git.kernel.org/stable/c/a0f0cf8341e34e5d2265bfd3a7ad68342da1e2aa"}],"title":"btrfs: get rid of warning on transaction commit when using flushoncommit","x_generator":{"engine":"bippy-1.2.0"}},"adp":[{"metrics":[{"other":{"type":"ssvc","content":{"id":"CVE-2022-48920","role":"CISA Coordinator","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"version":"2.0.3","timestamp":"2024-09-10T15:33:31.693996Z"}}}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2024-09-12T17:33:01.186Z"}}]}}