CVE-2021-47178 (GCVE-0-2021-47178)
Vulnerability from cvelistv5 – Published: 2024-03-25 09:16 – Updated: 2025-05-04 07:05
VLAI?
Title
scsi: target: core: Avoid smp_processor_id() in preemptible code
Summary
In the Linux kernel, the following vulnerability has been resolved:
scsi: target: core: Avoid smp_processor_id() in preemptible code
The BUG message "BUG: using smp_processor_id() in preemptible [00000000]
code" was observed for TCMU devices with kernel config DEBUG_PREEMPT.
The message was observed when blktests block/005 was run on TCMU devices
with fileio backend or user:zbc backend [1]. The commit 1130b499b4a7
("scsi: target: tcm_loop: Use LIO wq cmd submission helper") triggered the
symptom. The commit modified work queue to handle commands and changed
'current->nr_cpu_allowed' at smp_processor_id() call.
The message was also observed at system shutdown when TCMU devices were not
cleaned up [2]. The function smp_processor_id() was called in SCSI host
work queue for abort handling, and triggered the BUG message. This symptom
was observed regardless of the commit 1130b499b4a7 ("scsi: target:
tcm_loop: Use LIO wq cmd submission helper").
To avoid the preemptible code check at smp_processor_id(), get CPU ID with
raw_smp_processor_id() instead. The CPU ID is used for performance
improvement then thread move to other CPU will not affect the code.
[1]
[ 56.468103] run blktests block/005 at 2021-05-12 14:16:38
[ 57.369473] check_preemption_disabled: 85 callbacks suppressed
[ 57.369480] BUG: using smp_processor_id() in preemptible [00000000] code: fio/1511
[ 57.369506] BUG: using smp_processor_id() in preemptible [00000000] code: fio/1510
[ 57.369512] BUG: using smp_processor_id() in preemptible [00000000] code: fio/1506
[ 57.369552] caller is __target_init_cmd+0x157/0x170 [target_core_mod]
[ 57.369606] CPU: 4 PID: 1506 Comm: fio Not tainted 5.13.0-rc1+ #34
[ 57.369613] Hardware name: System manufacturer System Product Name/PRIME Z270-A, BIOS 1302 03/15/2018
[ 57.369617] Call Trace:
[ 57.369621] BUG: using smp_processor_id() in preemptible [00000000] code: fio/1507
[ 57.369628] dump_stack+0x6d/0x89
[ 57.369642] check_preemption_disabled+0xc8/0xd0
[ 57.369628] caller is __target_init_cmd+0x157/0x170 [target_core_mod]
[ 57.369655] __target_init_cmd+0x157/0x170 [target_core_mod]
[ 57.369695] target_init_cmd+0x76/0x90 [target_core_mod]
[ 57.369732] tcm_loop_queuecommand+0x109/0x210 [tcm_loop]
[ 57.369744] scsi_queue_rq+0x38e/0xc40
[ 57.369761] __blk_mq_try_issue_directly+0x109/0x1c0
[ 57.369779] blk_mq_try_issue_directly+0x43/0x90
[ 57.369790] blk_mq_submit_bio+0x4e5/0x5d0
[ 57.369812] submit_bio_noacct+0x46e/0x4e0
[ 57.369830] __blkdev_direct_IO_simple+0x1a3/0x2d0
[ 57.369859] ? set_init_blocksize.isra.0+0x60/0x60
[ 57.369880] generic_file_read_iter+0x89/0x160
[ 57.369898] blkdev_read_iter+0x44/0x60
[ 57.369906] new_sync_read+0x102/0x170
[ 57.369929] vfs_read+0xd4/0x160
[ 57.369941] __x64_sys_pread64+0x6e/0xa0
[ 57.369946] ? lockdep_hardirqs_on+0x79/0x100
[ 57.369958] do_syscall_64+0x3a/0x70
[ 57.369965] entry_SYSCALL_64_after_hwframe+0x44/0xae
[ 57.369973] RIP: 0033:0x7f7ed4c1399f
[ 57.369979] Code: 08 89 3c 24 48 89 4c 24 18 e8 7d f3 ff ff 4c 8b 54 24 18 48 8b 54 24 10 41 89 c0 48 8b 74 24 08 8b 3c 24 b8 11 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 31 44 89 c7 48 89 04 24 e8 cd f3 ff ff 48 8b
[ 57.369983] RSP: 002b:00007ffd7918c580 EFLAGS: 00000293 ORIG_RAX: 0000000000000011
[ 57.369990] RAX: ffffffffffffffda RBX: 00000000015b4540 RCX: 00007f7ed4c1399f
[ 57.369993] RDX: 0000000000001000 RSI: 00000000015de000 RDI: 0000000000000009
[ 57.369996] RBP: 00000000015b4540 R08: 0000000000000000 R09: 0000000000000001
[ 57.369999] R10: 0000000000e5c000 R11: 0000000000000293 R12: 00007f7eb5269a70
[ 57.370002] R13: 0000000000000000 R14: 0000000000001000 R15: 00000000015b4568
[ 57.370031] CPU: 7 PID: 1507 Comm: fio Not tainted 5.13.0-rc1+ #34
[ 57.370036] Hardware name: System manufacturer System Product Name/PRIME Z270-A, BIOS 1302 03/15/2018
[ 57.370039] Call Trace:
[ 57.370045] dump_stack+0x6d/0x89
[ 57.370056] ch
---truncated---
Severity ?
No CVSS data available.
Assigner
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Linux | Linux |
Affected:
008b936bbde3e87a611b3828a0d5d2a4f99026a0 , < a222d2794c53f8165de20aa91b39e35e4b72bce9
(git)
Affected: 1526d9f10c6184031e42afad0adbdde1213e8ad1 , < a20b6eaf4f35046a429cde57bee7eb5f13d6857f (git) Affected: 1526d9f10c6184031e42afad0adbdde1213e8ad1 , < 70ca3c57ff914113f681e657634f7fbfa68e1ad1 (git) |
||
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"containers": "{\"adp\": [{\"title\": \"CVE Program Container\", \"references\": [{\"url\": \"https://git.kernel.org/stable/c/a222d2794c53f8165de20aa91b39e35e4b72bce9\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://git.kernel.org/stable/c/a20b6eaf4f35046a429cde57bee7eb5f13d6857f\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://git.kernel.org/stable/c/70ca3c57ff914113f681e657634f7fbfa68e1ad1\", \"tags\": [\"x_transferred\"]}], \"providerMetadata\": {\"orgId\": \"af854a3a-2127-422b-91ae-364da2661108\", \"shortName\": \"CVE\", \"dateUpdated\": \"2024-08-04T05:24:39.944Z\"}}, {\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2021-47178\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2024-09-10T15:54:21.876109Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2024-09-11T12:42:18.789Z\"}}], \"cna\": {\"title\": \"scsi: target: core: Avoid smp_processor_id() in preemptible code\", \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"008b936bbde3e87a611b3828a0d5d2a4f99026a0\", \"lessThan\": \"a222d2794c53f8165de20aa91b39e35e4b72bce9\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"1526d9f10c6184031e42afad0adbdde1213e8ad1\", \"lessThan\": \"a20b6eaf4f35046a429cde57bee7eb5f13d6857f\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"1526d9f10c6184031e42afad0adbdde1213e8ad1\", \"lessThan\": \"70ca3c57ff914113f681e657634f7fbfa68e1ad1\", \"versionType\": \"git\"}], \"programFiles\": [\"drivers/target/target_core_transport.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"5.11\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"5.11\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"5.12.9\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.12.*\"}, {\"status\": \"unaffected\", \"version\": \"5.13\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"drivers/target/target_core_transport.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/a222d2794c53f8165de20aa91b39e35e4b72bce9\"}, {\"url\": \"https://git.kernel.org/stable/c/a20b6eaf4f35046a429cde57bee7eb5f13d6857f\"}, {\"url\": \"https://git.kernel.org/stable/c/70ca3c57ff914113f681e657634f7fbfa68e1ad1\"}], \"x_generator\": {\"engine\": \"bippy-5f407fcff5a0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nscsi: target: core: Avoid smp_processor_id() in preemptible code\\n\\nThe BUG message \\\"BUG: using smp_processor_id() in preemptible [00000000]\\ncode\\\" was observed for TCMU devices with kernel config DEBUG_PREEMPT.\\n\\nThe message was observed when blktests block/005 was run on TCMU devices\\nwith fileio backend or user:zbc backend [1]. The commit 1130b499b4a7\\n(\\\"scsi: target: tcm_loop: Use LIO wq cmd submission helper\\\") triggered the\\nsymptom. The commit modified work queue to handle commands and changed\\n\u0027current-\u003enr_cpu_allowed\u0027 at smp_processor_id() call.\\n\\nThe message was also observed at system shutdown when TCMU devices were not\\ncleaned up [2]. The function smp_processor_id() was called in SCSI host\\nwork queue for abort handling, and triggered the BUG message. This symptom\\nwas observed regardless of the commit 1130b499b4a7 (\\\"scsi: target:\\ntcm_loop: Use LIO wq cmd submission helper\\\").\\n\\nTo avoid the preemptible code check at smp_processor_id(), get CPU ID with\\nraw_smp_processor_id() instead. The CPU ID is used for performance\\nimprovement then thread move to other CPU will not affect the code.\\n\\n[1]\\n\\n[ 56.468103] run blktests block/005 at 2021-05-12 14:16:38\\n[ 57.369473] check_preemption_disabled: 85 callbacks suppressed\\n[ 57.369480] BUG: using smp_processor_id() in preemptible [00000000] code: fio/1511\\n[ 57.369506] BUG: using smp_processor_id() in preemptible [00000000] code: fio/1510\\n[ 57.369512] BUG: using smp_processor_id() in preemptible [00000000] code: fio/1506\\n[ 57.369552] caller is __target_init_cmd+0x157/0x170 [target_core_mod]\\n[ 57.369606] CPU: 4 PID: 1506 Comm: fio Not tainted 5.13.0-rc1+ #34\\n[ 57.369613] Hardware name: System manufacturer System Product Name/PRIME Z270-A, BIOS 1302 03/15/2018\\n[ 57.369617] Call Trace:\\n[ 57.369621] BUG: using smp_processor_id() in preemptible [00000000] code: fio/1507\\n[ 57.369628] dump_stack+0x6d/0x89\\n[ 57.369642] check_preemption_disabled+0xc8/0xd0\\n[ 57.369628] caller is __target_init_cmd+0x157/0x170 [target_core_mod]\\n[ 57.369655] __target_init_cmd+0x157/0x170 [target_core_mod]\\n[ 57.369695] target_init_cmd+0x76/0x90 [target_core_mod]\\n[ 57.369732] tcm_loop_queuecommand+0x109/0x210 [tcm_loop]\\n[ 57.369744] scsi_queue_rq+0x38e/0xc40\\n[ 57.369761] __blk_mq_try_issue_directly+0x109/0x1c0\\n[ 57.369779] blk_mq_try_issue_directly+0x43/0x90\\n[ 57.369790] blk_mq_submit_bio+0x4e5/0x5d0\\n[ 57.369812] submit_bio_noacct+0x46e/0x4e0\\n[ 57.369830] __blkdev_direct_IO_simple+0x1a3/0x2d0\\n[ 57.369859] ? set_init_blocksize.isra.0+0x60/0x60\\n[ 57.369880] generic_file_read_iter+0x89/0x160\\n[ 57.369898] blkdev_read_iter+0x44/0x60\\n[ 57.369906] new_sync_read+0x102/0x170\\n[ 57.369929] vfs_read+0xd4/0x160\\n[ 57.369941] __x64_sys_pread64+0x6e/0xa0\\n[ 57.369946] ? lockdep_hardirqs_on+0x79/0x100\\n[ 57.369958] do_syscall_64+0x3a/0x70\\n[ 57.369965] entry_SYSCALL_64_after_hwframe+0x44/0xae\\n[ 57.369973] RIP: 0033:0x7f7ed4c1399f\\n[ 57.369979] Code: 08 89 3c 24 48 89 4c 24 18 e8 7d f3 ff ff 4c 8b 54 24 18 48 8b 54 24 10 41 89 c0 48 8b 74 24 08 8b 3c 24 b8 11 00 00 00 0f 05 \u003c48\u003e 3d 00 f0 ff ff 77 31 44 89 c7 48 89 04 24 e8 cd f3 ff ff 48 8b\\n[ 57.369983] RSP: 002b:00007ffd7918c580 EFLAGS: 00000293 ORIG_RAX: 0000000000000011\\n[ 57.369990] RAX: ffffffffffffffda RBX: 00000000015b4540 RCX: 00007f7ed4c1399f\\n[ 57.369993] RDX: 0000000000001000 RSI: 00000000015de000 RDI: 0000000000000009\\n[ 57.369996] RBP: 00000000015b4540 R08: 0000000000000000 R09: 0000000000000001\\n[ 57.369999] R10: 0000000000e5c000 R11: 0000000000000293 R12: 00007f7eb5269a70\\n[ 57.370002] R13: 0000000000000000 R14: 0000000000001000 R15: 00000000015b4568\\n[ 57.370031] CPU: 7 PID: 1507 Comm: fio Not tainted 5.13.0-rc1+ #34\\n[ 57.370036] Hardware name: System manufacturer System Product Name/PRIME Z270-A, BIOS 1302 03/15/2018\\n[ 57.370039] Call Trace:\\n[ 57.370045] dump_stack+0x6d/0x89\\n[ 57.370056] ch\\n---truncated---\"}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2024-12-19T07:36:52.635Z\"}}}",
"cveMetadata": "{\"cveId\": \"CVE-2021-47178\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2024-12-19T07:36:52.635Z\", \"dateReserved\": \"2024-03-25T09:12:14.112Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-03-25T09:16:28.024Z\", \"assignerShortName\": \"Linux\"}",
"dataType": "CVE_RECORD",
"dataVersion": "5.1"
}
}
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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