{ "dataType": "CVE_RECORD", "dataVersion": "5.1", "cveMetadata": { "cveId": "CVE-2021-47189", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-03-25T09:12:14.113Z", "datePublished": "2024-04-10T18:56:28.194Z", "dateUpdated": "2024-08-04T05:32:07.308Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2024-05-29T05:03:36.251Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: fix memory ordering between normal and ordered work functions\n\nOrdered work functions aren't guaranteed to be handled by the same thread\nwhich executed the normal work functions. The only way execution between\nnormal/ordered functions is synchronized is via the WORK_DONE_BIT,\nunfortunately the used bitops don't guarantee any ordering whatsoever.\n\nThis manifested as seemingly inexplicable crashes on ARM64, where\nasync_chunk::inode is seen as non-null in async_cow_submit which causes\nsubmit_compressed_extents to be called and crash occurs because\nasync_chunk::inode suddenly became NULL. The call trace was similar to:\n\n pc : submit_compressed_extents+0x38/0x3d0\n lr : async_cow_submit+0x50/0xd0\n sp : ffff800015d4bc20\n\n \n\n Call trace:\n submit_compressed_extents+0x38/0x3d0\n async_cow_submit+0x50/0xd0\n run_ordered_work+0xc8/0x280\n btrfs_work_helper+0x98/0x250\n process_one_work+0x1f0/0x4ac\n worker_thread+0x188/0x504\n kthread+0x110/0x114\n ret_from_fork+0x10/0x18\n\nFix this by adding respective barrier calls which ensure that all\naccesses preceding setting of WORK_DONE_BIT are strictly ordered before\nsetting the flag. At the same time add a read barrier after reading of\nWORK_DONE_BIT in run_ordered_work which ensures all subsequent loads\nwould be strictly ordered after reading the bit. This in turn ensures\nare all accesses before WORK_DONE_BIT are going to be strictly ordered\nbefore any access that can occur in ordered_func." } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "fs/btrfs/async-thread.c" ], "versions": [ { "version": "08a9ff326418", "lessThan": "bd660a20fea3", "status": "affected", "versionType": "git" }, { "version": "08a9ff326418", "lessThan": "637d652d351f", "status": "affected", "versionType": "git" }, { "version": "08a9ff326418", "lessThan": "804a9d239ae9", "status": "affected", "versionType": "git" }, { "version": "08a9ff326418", "lessThan": "ed058d735a70", "status": "affected", "versionType": "git" }, { "version": "08a9ff326418", "lessThan": "670f6b3867c8", "status": "affected", "versionType": "git" }, { "version": "08a9ff326418", "lessThan": "6adbc07ebcaf", "status": "affected", "versionType": "git" }, { "version": "08a9ff326418", "lessThan": "47e6f9f69153", "status": "affected", "versionType": "git" }, { "version": "08a9ff326418", "lessThan": "45da9c1767ac", "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/async-thread.c" ], "versions": [ { "version": "3.15", "status": "affected" }, { "version": "0", "lessThan": "3.15", "status": "unaffected", "versionType": "custom" }, { "version": "4.4.293", "lessThanOrEqual": "4.4.*", "status": "unaffected", "versionType": "custom" }, { "version": "4.9.291", "lessThanOrEqual": "4.9.*", "status": "unaffected", "versionType": "custom" }, { "version": "4.14.256", "lessThanOrEqual": "4.14.*", "status": "unaffected", "versionType": "custom" }, { "version": "4.19.218", "lessThanOrEqual": "4.19.*", "status": "unaffected", "versionType": "custom" }, { "version": "5.4.162", "lessThanOrEqual": "5.4.*", "status": "unaffected", "versionType": "custom" }, { "version": "5.10.82", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "custom" }, { "version": "5.15.5", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "custom" }, { "version": "5.16", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/bd660a20fea3ec60a49709ef5360f145ec0fe779" }, { "url": "https://git.kernel.org/stable/c/637d652d351fd4f263ef302dc52f3971d314e500" }, { "url": "https://git.kernel.org/stable/c/804a9d239ae9cbe88e861a7cd62319cc6ec7b136" }, { "url": "https://git.kernel.org/stable/c/ed058d735a70f4b063323f1a7bb33cda0f987513" }, { "url": "https://git.kernel.org/stable/c/670f6b3867c8f0f11e5097f353b164cecfec6179" }, { "url": "https://git.kernel.org/stable/c/6adbc07ebcaf8bead08b21687d49e0fc94400987" }, { "url": "https://git.kernel.org/stable/c/47e6f9f69153247109042010f3a77579e9dc61ff" }, { "url": "https://git.kernel.org/stable/c/45da9c1767ac31857df572f0a909fbe88fd5a7e9" } ], "title": "btrfs: fix memory ordering between normal and ordered work functions", "x_generator": { "engine": "bippy-a5840b7849dd" } }, "adp": [ { "title": "CISA ADP Vulnrichment", "metrics": [ { "other": { "type": "ssvc", "content": { "id": "CVE-2021-47189", "role": "CISA Coordinator", "options": [ { "Exploitation": "none" }, { "Automatable": "no" }, { "Technical Impact": "partial" } ], "version": "2.0.3", "timestamp": "2024-04-10T19:44:25.164224Z" } } } ], "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-06-04T17:14:11.721Z" } }, { "providerMetadata": { "orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-04T05:32:07.308Z" }, "title": "CVE Program Container", "references": [ { "url": "https://git.kernel.org/stable/c/bd660a20fea3ec60a49709ef5360f145ec0fe779", "tags": [ "x_transferred" ] }, { "url": "https://git.kernel.org/stable/c/637d652d351fd4f263ef302dc52f3971d314e500", "tags": [ "x_transferred" ] }, { "url": "https://git.kernel.org/stable/c/804a9d239ae9cbe88e861a7cd62319cc6ec7b136", "tags": [ "x_transferred" ] }, { "url": "https://git.kernel.org/stable/c/ed058d735a70f4b063323f1a7bb33cda0f987513", "tags": [ "x_transferred" ] }, { "url": "https://git.kernel.org/stable/c/670f6b3867c8f0f11e5097f353b164cecfec6179", "tags": [ "x_transferred" ] }, { "url": "https://git.kernel.org/stable/c/6adbc07ebcaf8bead08b21687d49e0fc94400987", "tags": [ "x_transferred" ] }, { "url": "https://git.kernel.org/stable/c/47e6f9f69153247109042010f3a77579e9dc61ff", "tags": [ "x_transferred" ] }, { "url": "https://git.kernel.org/stable/c/45da9c1767ac31857df572f0a909fbe88fd5a7e9", "tags": [ "x_transferred" ] } ] } ] } }