cve-2024-26658
Vulnerability from cvelistv5
Published
2024-04-02 06:22
Modified
2024-12-19 08:44
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: bcachefs: grab s_umount only if snapshotting When I was testing mongodb over bcachefs with compression, there is a lockdep warning when snapshotting mongodb data volume. $ cat test.sh prog=bcachefs $prog subvolume create /mnt/data $prog subvolume create /mnt/data/snapshots while true;do $prog subvolume snapshot /mnt/data /mnt/data/snapshots/$(date +%s) sleep 1s done $ cat /etc/mongodb.conf systemLog: destination: file logAppend: true path: /mnt/data/mongod.log storage: dbPath: /mnt/data/ lockdep reports: [ 3437.452330] ====================================================== [ 3437.452750] WARNING: possible circular locking dependency detected [ 3437.453168] 6.7.0-rc7-custom+ #85 Tainted: G E [ 3437.453562] ------------------------------------------------------ [ 3437.453981] bcachefs/35533 is trying to acquire lock: [ 3437.454325] ffffa0a02b2b1418 (sb_writers#10){.+.+}-{0:0}, at: filename_create+0x62/0x190 [ 3437.454875] but task is already holding lock: [ 3437.455268] ffffa0a02b2b10e0 (&type->s_umount_key#48){.+.+}-{3:3}, at: bch2_fs_file_ioctl+0x232/0xc90 [bcachefs] [ 3437.456009] which lock already depends on the new lock. [ 3437.456553] the existing dependency chain (in reverse order) is: [ 3437.457054] -> #3 (&type->s_umount_key#48){.+.+}-{3:3}: [ 3437.457507] down_read+0x3e/0x170 [ 3437.457772] bch2_fs_file_ioctl+0x232/0xc90 [bcachefs] [ 3437.458206] __x64_sys_ioctl+0x93/0xd0 [ 3437.458498] do_syscall_64+0x42/0xf0 [ 3437.458779] entry_SYSCALL_64_after_hwframe+0x6e/0x76 [ 3437.459155] -> #2 (&c->snapshot_create_lock){++++}-{3:3}: [ 3437.459615] down_read+0x3e/0x170 [ 3437.459878] bch2_truncate+0x82/0x110 [bcachefs] [ 3437.460276] bchfs_truncate+0x254/0x3c0 [bcachefs] [ 3437.460686] notify_change+0x1f1/0x4a0 [ 3437.461283] do_truncate+0x7f/0xd0 [ 3437.461555] path_openat+0xa57/0xce0 [ 3437.461836] do_filp_open+0xb4/0x160 [ 3437.462116] do_sys_openat2+0x91/0xc0 [ 3437.462402] __x64_sys_openat+0x53/0xa0 [ 3437.462701] do_syscall_64+0x42/0xf0 [ 3437.462982] entry_SYSCALL_64_after_hwframe+0x6e/0x76 [ 3437.463359] -> #1 (&sb->s_type->i_mutex_key#15){+.+.}-{3:3}: [ 3437.463843] down_write+0x3b/0xc0 [ 3437.464223] bch2_write_iter+0x5b/0xcc0 [bcachefs] [ 3437.464493] vfs_write+0x21b/0x4c0 [ 3437.464653] ksys_write+0x69/0xf0 [ 3437.464839] do_syscall_64+0x42/0xf0 [ 3437.465009] entry_SYSCALL_64_after_hwframe+0x6e/0x76 [ 3437.465231] -> #0 (sb_writers#10){.+.+}-{0:0}: [ 3437.465471] __lock_acquire+0x1455/0x21b0 [ 3437.465656] lock_acquire+0xc6/0x2b0 [ 3437.465822] mnt_want_write+0x46/0x1a0 [ 3437.465996] filename_create+0x62/0x190 [ 3437.466175] user_path_create+0x2d/0x50 [ 3437.466352] bch2_fs_file_ioctl+0x2ec/0xc90 [bcachefs] [ 3437.466617] __x64_sys_ioctl+0x93/0xd0 [ 3437.466791] do_syscall_64+0x42/0xf0 [ 3437.466957] entry_SYSCALL_64_after_hwframe+0x6e/0x76 [ 3437.467180] other info that might help us debug this: [ 3437.469670] 2 locks held by bcachefs/35533: other info that might help us debug this: [ 3437.467507] Chain exists of: sb_writers#10 --> &c->snapshot_create_lock --> &type->s_umount_key#48 [ 3437.467979] Possible unsafe locking scenario: [ 3437.468223] CPU0 CPU1 [ 3437.468405] ---- ---- [ 3437.468585] rlock(&type->s_umount_key#48); [ 3437.468758] lock(&c->snapshot_create_lock); [ 3437.469030] lock(&type->s_umount_key#48); [ 3437.469291] rlock(sb_writers#10); [ 3437.469434] *** DEADLOCK *** [ 3437.469 ---truncated---
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/2acc59dd88d27ad69b66ded80df16c042b04eeecPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/5b41d3fd04c6757b9c2a60a0c5b2609cae9999dfPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/2acc59dd88d27ad69b66ded80df16c042b04eeecPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/5b41d3fd04c6757b9c2a60a0c5b2609cae9999dfPatch
Impacted products
Vendor Product Version
Linux Linux Version: 1c6fdbd8f2465ddfb73a01ec620cbf3d14044e1a
Version: 1c6fdbd8f2465ddfb73a01ec620cbf3d14044e1a
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   Linux Linux Version: 6.7
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{
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              "content": {
                "id": "CVE-2024-26658",
                "options": [
                  {
                    "Exploitation": "none"
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                    "Automatable": "no"
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                  {
                    "Technical Impact": "partial"
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                "role": "CISA Coordinator",
                "timestamp": "2024-04-02T18:32:11.328360Z",
                "version": "2.0.3"
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          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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            "url": "https://git.kernel.org/stable/c/2acc59dd88d27ad69b66ded80df16c042b04eeec"
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        "title": "CVE Program Container"
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    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/bcachefs/fs-ioctl.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "status": "affected",
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              "lessThan": "2acc59dd88d27ad69b66ded80df16c042b04eeec",
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              "versionType": "git"
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          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
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          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "version": "0",
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              "version": "6.7.5",
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              "status": "unaffected",
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              "versionType": "original_commit_for_fix"
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbcachefs: grab s_umount only if snapshotting\n\nWhen I was testing mongodb over bcachefs with compression,\nthere is a lockdep warning when snapshotting mongodb data volume.\n\n$ cat test.sh\nprog=bcachefs\n\n$prog subvolume create /mnt/data\n$prog subvolume create /mnt/data/snapshots\n\nwhile true;do\n    $prog subvolume snapshot /mnt/data /mnt/data/snapshots/$(date +%s)\n    sleep 1s\ndone\n\n$ cat /etc/mongodb.conf\nsystemLog:\n  destination: file\n  logAppend: true\n  path: /mnt/data/mongod.log\n\nstorage:\n  dbPath: /mnt/data/\n\nlockdep reports:\n[ 3437.452330] ======================================================\n[ 3437.452750] WARNING: possible circular locking dependency detected\n[ 3437.453168] 6.7.0-rc7-custom+ #85 Tainted: G            E\n[ 3437.453562] ------------------------------------------------------\n[ 3437.453981] bcachefs/35533 is trying to acquire lock:\n[ 3437.454325] ffffa0a02b2b1418 (sb_writers#10){.+.+}-{0:0}, at: filename_create+0x62/0x190\n[ 3437.454875]\n               but task is already holding lock:\n[ 3437.455268] ffffa0a02b2b10e0 (\u0026type-\u003es_umount_key#48){.+.+}-{3:3}, at: bch2_fs_file_ioctl+0x232/0xc90 [bcachefs]\n[ 3437.456009]\n               which lock already depends on the new lock.\n\n[ 3437.456553]\n               the existing dependency chain (in reverse order) is:\n[ 3437.457054]\n               -\u003e #3 (\u0026type-\u003es_umount_key#48){.+.+}-{3:3}:\n[ 3437.457507]        down_read+0x3e/0x170\n[ 3437.457772]        bch2_fs_file_ioctl+0x232/0xc90 [bcachefs]\n[ 3437.458206]        __x64_sys_ioctl+0x93/0xd0\n[ 3437.458498]        do_syscall_64+0x42/0xf0\n[ 3437.458779]        entry_SYSCALL_64_after_hwframe+0x6e/0x76\n[ 3437.459155]\n               -\u003e #2 (\u0026c-\u003esnapshot_create_lock){++++}-{3:3}:\n[ 3437.459615]        down_read+0x3e/0x170\n[ 3437.459878]        bch2_truncate+0x82/0x110 [bcachefs]\n[ 3437.460276]        bchfs_truncate+0x254/0x3c0 [bcachefs]\n[ 3437.460686]        notify_change+0x1f1/0x4a0\n[ 3437.461283]        do_truncate+0x7f/0xd0\n[ 3437.461555]        path_openat+0xa57/0xce0\n[ 3437.461836]        do_filp_open+0xb4/0x160\n[ 3437.462116]        do_sys_openat2+0x91/0xc0\n[ 3437.462402]        __x64_sys_openat+0x53/0xa0\n[ 3437.462701]        do_syscall_64+0x42/0xf0\n[ 3437.462982]        entry_SYSCALL_64_after_hwframe+0x6e/0x76\n[ 3437.463359]\n               -\u003e #1 (\u0026sb-\u003es_type-\u003ei_mutex_key#15){+.+.}-{3:3}:\n[ 3437.463843]        down_write+0x3b/0xc0\n[ 3437.464223]        bch2_write_iter+0x5b/0xcc0 [bcachefs]\n[ 3437.464493]        vfs_write+0x21b/0x4c0\n[ 3437.464653]        ksys_write+0x69/0xf0\n[ 3437.464839]        do_syscall_64+0x42/0xf0\n[ 3437.465009]        entry_SYSCALL_64_after_hwframe+0x6e/0x76\n[ 3437.465231]\n               -\u003e #0 (sb_writers#10){.+.+}-{0:0}:\n[ 3437.465471]        __lock_acquire+0x1455/0x21b0\n[ 3437.465656]        lock_acquire+0xc6/0x2b0\n[ 3437.465822]        mnt_want_write+0x46/0x1a0\n[ 3437.465996]        filename_create+0x62/0x190\n[ 3437.466175]        user_path_create+0x2d/0x50\n[ 3437.466352]        bch2_fs_file_ioctl+0x2ec/0xc90 [bcachefs]\n[ 3437.466617]        __x64_sys_ioctl+0x93/0xd0\n[ 3437.466791]        do_syscall_64+0x42/0xf0\n[ 3437.466957]        entry_SYSCALL_64_after_hwframe+0x6e/0x76\n[ 3437.467180]\n               other info that might help us debug this:\n\n[ 3437.469670] 2 locks held by bcachefs/35533:\n               other info that might help us debug this:\n\n[ 3437.467507] Chain exists of:\n                 sb_writers#10 --\u003e \u0026c-\u003esnapshot_create_lock --\u003e \u0026type-\u003es_umount_key#48\n\n[ 3437.467979]  Possible unsafe locking scenario:\n\n[ 3437.468223]        CPU0                    CPU1\n[ 3437.468405]        ----                    ----\n[ 3437.468585]   rlock(\u0026type-\u003es_umount_key#48);\n[ 3437.468758]                                lock(\u0026c-\u003esnapshot_create_lock);\n[ 3437.469030]                                lock(\u0026type-\u003es_umount_key#48);\n[ 3437.469291]   rlock(sb_writers#10);\n[ 3437.469434]\n                *** DEADLOCK ***\n\n[ 3437.469\n---truncated---"
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      "providerMetadata": {
        "dateUpdated": "2024-12-19T08:44:28.202Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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      "references": [
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          "url": "https://git.kernel.org/stable/c/5b41d3fd04c6757b9c2a60a0c5b2609cae9999df"
        },
        {
          "url": "https://git.kernel.org/stable/c/2acc59dd88d27ad69b66ded80df16c042b04eeec"
        }
      ],
      "title": "bcachefs: grab s_umount only if snapshotting",
      "x_generator": {
        "engine": "bippy-5f407fcff5a0"
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    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2024-26658",
    "datePublished": "2024-04-02T06:22:08.468Z",
    "dateReserved": "2024-02-19T14:20:24.147Z",
    "dateUpdated": "2024-12-19T08:44:28.202Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2024-26658\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-04-02T07:15:42.903\",\"lastModified\":\"2025-02-03T16:15:21.710\",\"vulnStatus\":\"Analyzed\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nbcachefs: grab s_umount only if snapshotting\\n\\nWhen I was testing mongodb over bcachefs with compression,\\nthere is a lockdep warning when snapshotting mongodb data volume.\\n\\n$ cat test.sh\\nprog=bcachefs\\n\\n$prog subvolume create /mnt/data\\n$prog subvolume create /mnt/data/snapshots\\n\\nwhile true;do\\n    $prog subvolume snapshot /mnt/data /mnt/data/snapshots/$(date +%s)\\n    sleep 1s\\ndone\\n\\n$ cat /etc/mongodb.conf\\nsystemLog:\\n  destination: file\\n  logAppend: true\\n  path: /mnt/data/mongod.log\\n\\nstorage:\\n  dbPath: /mnt/data/\\n\\nlockdep reports:\\n[ 3437.452330] ======================================================\\n[ 3437.452750] WARNING: possible circular locking dependency detected\\n[ 3437.453168] 6.7.0-rc7-custom+ #85 Tainted: G            E\\n[ 3437.453562] ------------------------------------------------------\\n[ 3437.453981] bcachefs/35533 is trying to acquire lock:\\n[ 3437.454325] ffffa0a02b2b1418 (sb_writers#10){.+.+}-{0:0}, at: filename_create+0x62/0x190\\n[ 3437.454875]\\n               but task is already holding lock:\\n[ 3437.455268] ffffa0a02b2b10e0 (\u0026type-\u003es_umount_key#48){.+.+}-{3:3}, at: bch2_fs_file_ioctl+0x232/0xc90 [bcachefs]\\n[ 3437.456009]\\n               which lock already depends on the new lock.\\n\\n[ 3437.456553]\\n               the existing dependency chain (in reverse order) is:\\n[ 3437.457054]\\n               -\u003e #3 (\u0026type-\u003es_umount_key#48){.+.+}-{3:3}:\\n[ 3437.457507]        down_read+0x3e/0x170\\n[ 3437.457772]        bch2_fs_file_ioctl+0x232/0xc90 [bcachefs]\\n[ 3437.458206]        __x64_sys_ioctl+0x93/0xd0\\n[ 3437.458498]        do_syscall_64+0x42/0xf0\\n[ 3437.458779]        entry_SYSCALL_64_after_hwframe+0x6e/0x76\\n[ 3437.459155]\\n               -\u003e #2 (\u0026c-\u003esnapshot_create_lock){++++}-{3:3}:\\n[ 3437.459615]        down_read+0x3e/0x170\\n[ 3437.459878]        bch2_truncate+0x82/0x110 [bcachefs]\\n[ 3437.460276]        bchfs_truncate+0x254/0x3c0 [bcachefs]\\n[ 3437.460686]        notify_change+0x1f1/0x4a0\\n[ 3437.461283]        do_truncate+0x7f/0xd0\\n[ 3437.461555]        path_openat+0xa57/0xce0\\n[ 3437.461836]        do_filp_open+0xb4/0x160\\n[ 3437.462116]        do_sys_openat2+0x91/0xc0\\n[ 3437.462402]        __x64_sys_openat+0x53/0xa0\\n[ 3437.462701]        do_syscall_64+0x42/0xf0\\n[ 3437.462982]        entry_SYSCALL_64_after_hwframe+0x6e/0x76\\n[ 3437.463359]\\n               -\u003e #1 (\u0026sb-\u003es_type-\u003ei_mutex_key#15){+.+.}-{3:3}:\\n[ 3437.463843]        down_write+0x3b/0xc0\\n[ 3437.464223]        bch2_write_iter+0x5b/0xcc0 [bcachefs]\\n[ 3437.464493]        vfs_write+0x21b/0x4c0\\n[ 3437.464653]        ksys_write+0x69/0xf0\\n[ 3437.464839]        do_syscall_64+0x42/0xf0\\n[ 3437.465009]        entry_SYSCALL_64_after_hwframe+0x6e/0x76\\n[ 3437.465231]\\n               -\u003e #0 (sb_writers#10){.+.+}-{0:0}:\\n[ 3437.465471]        __lock_acquire+0x1455/0x21b0\\n[ 3437.465656]        lock_acquire+0xc6/0x2b0\\n[ 3437.465822]        mnt_want_write+0x46/0x1a0\\n[ 3437.465996]        filename_create+0x62/0x190\\n[ 3437.466175]        user_path_create+0x2d/0x50\\n[ 3437.466352]        bch2_fs_file_ioctl+0x2ec/0xc90 [bcachefs]\\n[ 3437.466617]        __x64_sys_ioctl+0x93/0xd0\\n[ 3437.466791]        do_syscall_64+0x42/0xf0\\n[ 3437.466957]        entry_SYSCALL_64_after_hwframe+0x6e/0x76\\n[ 3437.467180]\\n               other info that might help us debug this:\\n\\n[ 3437.469670] 2 locks held by bcachefs/35533:\\n               other info that might help us debug this:\\n\\n[ 3437.467507] Chain exists of:\\n                 sb_writers#10 --\u003e \u0026c-\u003esnapshot_create_lock --\u003e \u0026type-\u003es_umount_key#48\\n\\n[ 3437.467979]  Possible unsafe locking scenario:\\n\\n[ 3437.468223]        CPU0                    CPU1\\n[ 3437.468405]        ----                    ----\\n[ 3437.468585]   rlock(\u0026type-\u003es_umount_key#48);\\n[ 3437.468758]                                lock(\u0026c-\u003esnapshot_create_lock);\\n[ 3437.469030]                                lock(\u0026type-\u003es_umount_key#48);\\n[ 3437.469291]   rlock(sb_writers#10);\\n[ 3437.469434]\\n                *** DEADLOCK ***\\n\\n[ 3437.469\\n---truncated---\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: bcachefs: toma s_umount solo si se toma una instant\u00e1nea Cuando estaba probando mongodb sobre bcachefs con compresi\u00f3n, hay una advertencia de lockdep al tomar una instant\u00e1nea del volumen de datos de mongodb. $ cat test.sh prog=bcachefs $prog subvolumen crear /mnt/data $prog subvolumen crear /mnt/data/snapshots mientras es verdadero;do $prog subvolumen snapshot /mnt/data /mnt/data/snapshots/$(fecha +% s) dormir 1 hecho $ cat /etc/mongodb.conf systemLog: destino: archivo logAppend: verdadera ruta: /mnt/data/mongod.log almacenamiento: dbPath: /mnt/data/ lockdep informes: [3437.452330] ==== ==================================================== [ 3437.452750] ADVERTENCIA: posible dependencia de bloqueo circular detectada [ 3437.453168] 6.7.0-rc7-custom+ #85 Contaminado: GE [ 3437.453562] ---------------------- -------------------------------- [ 3437.453981] bcachefs/35533 est\u00e1 intentando adquirir el bloqueo: [ 3437.454325] ffffa0a02b2b1418 (sb_writers #10){.+.+}-{0:0}, en: filename_create+0x62/0x190 [ 3437.454875] pero la tarea ya mantiene el bloqueo: [ 3437.455268] ffffa0a02b2b10e0 (\u0026amp;type-\u0026gt;s_umount_key#48){.+.+ }-{3:3}, en: bch2_fs_file_ioctl+0x232/0xc90 [bcachefs] [ 3437.456009] cuyo bloqueo ya depende del nuevo bloqueo. [ 3437.456553] la cadena de dependencia existente (en orden inverso) es: [ 3437.457054] -\u0026gt; #3 (\u0026amp;type-\u0026gt;s_umount_key#48){.+.+}-{3:3}: [ 3437.457507] down_read+0x3e/0x170 [ 3437.457772] bch2_fs_file_ioctl+0x232/0xc90 [bcachefs] [ 3437.458206] __x64_sys_ioctl+0x93/0xd0 [ 3437.458498] do_syscall_64+0x42/0xf0 [ 3437.458 779] Entry_SYSCALL_64_after_hwframe+0x6e/0x76 [3437.459155] -\u0026gt; #2 (\u0026amp;c-\u0026gt;snapshot_create_lock){+ +++}-{3:3}: [ 3437.459615] down_read+0x3e/0x170 [ 3437.459878] bch2_truncate+0x82/0x110 [bcachefs] [ 3437.460276] bchfs_truncate+0x254/0x3c0 [bcachefs] [ 3437.4 60686] notificar_cambio+0x1f1/0x4a0 [ 3437.461283] do_truncate+0x7f/0xd0 [ 3437.461555] path_openat+0xa57/0xce0 [ 3437.461836] do_filp_open+0xb4/0x160 [ 3437.462116] do_sys_openat2+0x91/0xc0 [ 34 37.462402] __x64_sys_openat+0x53/0xa0 [ 3437.462701] do_syscall_64+0x42/0xf0 [ 3437.462982] Entry_SYSCALL_64_after_hwframe+0x6e/0x76 [ 3437.463359] -\u0026gt; #1 (\u0026amp;sb-\u0026gt;s_type-\u0026gt;i_mutex_key#15){+.+.}-{3:3}: [ 3437.463843] down_write+0x3b/0xc0 [ 3437.464223] bch2_write_it e+0x5b /0xcc0 [bcachefs] [ 3437.464493] vfs_write+0x21b/0x4c0 [ 3437.464653] ksys_write+0x69/0xf0 [ 3437.464839] do_syscall_64+0x42/0xf0 [ 3437.465009] entrada_SYSCALL _64_after_hwframe+0x6e/0x76 [ 3437.465231] -\u0026gt; #0 (sb_writers#10){ .+.+}-{0:0}: [ 3437.465471] __lock_acquire+0x1455/0x21b0 [ 3437.465656] lock_acquire+0xc6/0x2b0 [ 3437.465822] mnt_want_write+0x46/0x1a0 [ 3437.465996] nombre de archivo _create+0x62/0x190 [ 3437.466175] ruta_usuario_create+0x2d /0x50 [ 3437.466352] bch2_fs_file_ioctl+0x2ec/0xc90 [bcachefs] [ 3437.466617] __x64_sys_ioctl+0x93/0xd0 [ 3437.466791] do_syscall_64+0x42/0xf0 [ 3437 .466957] Entry_SYSCALL_64_after_hwframe+0x6e/0x76 [ 3437.467180] otra informaci\u00f3n que podr\u00eda ayudarnos a depurar esto: [ 3437.469670] 2 bloqueos mantenidos por bcachefs/35533: otra informaci\u00f3n que podr\u00eda ayudarnos a depurar esto: [3437.467507] Existe cadena de: sb_writers#10 --\u0026gt; \u0026amp;c-\u0026gt;snapshot_create_lock --\u0026gt; \u0026amp;type-\u0026gt;s_umount_key#48 [3437.467979] Posiblemente inseguro escenario de bloqueo: [3437.468223] CPU0 CPU1 [3437.468405] ---- ---- [3437.468585] rlock(\u0026amp;type-\u0026gt;s_umount_key#48); [ 3437.468758] bloqueo(\u0026amp;c-\u0026gt;snapshot_create_lock); [ 3437.469030] bloqueo(\u0026amp;type-\u0026gt;s_umount_key#48); [3437.469291] rlock(sb_writers#10); [ 3437.469434] *** INTERBLOQUEO *** [ 3437.469 ---truncado---\"}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H\",\"baseScore\":5.5,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":3.6}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-667\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.7\",\"versionEndExcluding\":\"6.7.5\",\"matchCriteriaId\":\"01925741-2C95-47C1-A7EA-3DC2BB0012D3\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/2acc59dd88d27ad69b66ded80df16c042b04eeec\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/5b41d3fd04c6757b9c2a60a0c5b2609cae9999df\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/2acc59dd88d27ad69b66ded80df16c042b04eeec\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/5b41d3fd04c6757b9c2a60a0c5b2609cae9999df\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]}]}}",
    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CVE Program Container\", \"references\": [{\"url\": \"https://git.kernel.org/stable/c/5b41d3fd04c6757b9c2a60a0c5b2609cae9999df\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://git.kernel.org/stable/c/2acc59dd88d27ad69b66ded80df16c042b04eeec\", \"tags\": [\"x_transferred\"]}], \"providerMetadata\": {\"orgId\": \"af854a3a-2127-422b-91ae-364da2661108\", \"shortName\": \"CVE\", \"dateUpdated\": \"2024-08-02T00:14:12.825Z\"}}, {\"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2024-26658\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2024-04-02T18:32:11.328360Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2024-05-23T19:01:21.312Z\"}, \"title\": \"CISA ADP Vulnrichment\"}], \"cna\": {\"title\": \"bcachefs: grab s_umount only if snapshotting\", \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"1c6fdbd8f246\", \"lessThan\": \"5b41d3fd04c6\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"1c6fdbd8f246\", \"lessThan\": \"2acc59dd88d2\", \"versionType\": \"git\"}], \"programFiles\": [\"fs/bcachefs/fs-ioctl.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"6.7\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"6.7\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"6.7.5\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.7.*\"}, {\"status\": \"unaffected\", \"version\": \"6.8\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"fs/bcachefs/fs-ioctl.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/5b41d3fd04c6757b9c2a60a0c5b2609cae9999df\"}, {\"url\": \"https://git.kernel.org/stable/c/2acc59dd88d27ad69b66ded80df16c042b04eeec\"}], \"x_generator\": {\"engine\": \"bippy-8e903de6a542\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nbcachefs: grab s_umount only if snapshotting\\n\\nWhen I was testing mongodb over bcachefs with compression,\\nthere is a lockdep warning when snapshotting mongodb data volume.\\n\\n$ cat test.sh\\nprog=bcachefs\\n\\n$prog subvolume create /mnt/data\\n$prog subvolume create /mnt/data/snapshots\\n\\nwhile true;do\\n    $prog subvolume snapshot /mnt/data /mnt/data/snapshots/$(date +%s)\\n    sleep 1s\\ndone\\n\\n$ cat /etc/mongodb.conf\\nsystemLog:\\n  destination: file\\n  logAppend: true\\n  path: /mnt/data/mongod.log\\n\\nstorage:\\n  dbPath: /mnt/data/\\n\\nlockdep reports:\\n[ 3437.452330] ======================================================\\n[ 3437.452750] WARNING: possible circular locking dependency detected\\n[ 3437.453168] 6.7.0-rc7-custom+ #85 Tainted: G            E\\n[ 3437.453562] ------------------------------------------------------\\n[ 3437.453981] bcachefs/35533 is trying to acquire lock:\\n[ 3437.454325] ffffa0a02b2b1418 (sb_writers#10){.+.+}-{0:0}, at: filename_create+0x62/0x190\\n[ 3437.454875]\\n               but task is already holding lock:\\n[ 3437.455268] ffffa0a02b2b10e0 (\u0026type-\u003es_umount_key#48){.+.+}-{3:3}, at: bch2_fs_file_ioctl+0x232/0xc90 [bcachefs]\\n[ 3437.456009]\\n               which lock already depends on the new lock.\\n\\n[ 3437.456553]\\n               the existing dependency chain (in reverse order) is:\\n[ 3437.457054]\\n               -\u003e #3 (\u0026type-\u003es_umount_key#48){.+.+}-{3:3}:\\n[ 3437.457507]        down_read+0x3e/0x170\\n[ 3437.457772]        bch2_fs_file_ioctl+0x232/0xc90 [bcachefs]\\n[ 3437.458206]        __x64_sys_ioctl+0x93/0xd0\\n[ 3437.458498]        do_syscall_64+0x42/0xf0\\n[ 3437.458779]        entry_SYSCALL_64_after_hwframe+0x6e/0x76\\n[ 3437.459155]\\n               -\u003e #2 (\u0026c-\u003esnapshot_create_lock){++++}-{3:3}:\\n[ 3437.459615]        down_read+0x3e/0x170\\n[ 3437.459878]        bch2_truncate+0x82/0x110 [bcachefs]\\n[ 3437.460276]        bchfs_truncate+0x254/0x3c0 [bcachefs]\\n[ 3437.460686]        notify_change+0x1f1/0x4a0\\n[ 3437.461283]        do_truncate+0x7f/0xd0\\n[ 3437.461555]        path_openat+0xa57/0xce0\\n[ 3437.461836]        do_filp_open+0xb4/0x160\\n[ 3437.462116]        do_sys_openat2+0x91/0xc0\\n[ 3437.462402]        __x64_sys_openat+0x53/0xa0\\n[ 3437.462701]        do_syscall_64+0x42/0xf0\\n[ 3437.462982]        entry_SYSCALL_64_after_hwframe+0x6e/0x76\\n[ 3437.463359]\\n               -\u003e #1 (\u0026sb-\u003es_type-\u003ei_mutex_key#15){+.+.}-{3:3}:\\n[ 3437.463843]        down_write+0x3b/0xc0\\n[ 3437.464223]        bch2_write_iter+0x5b/0xcc0 [bcachefs]\\n[ 3437.464493]        vfs_write+0x21b/0x4c0\\n[ 3437.464653]        ksys_write+0x69/0xf0\\n[ 3437.464839]        do_syscall_64+0x42/0xf0\\n[ 3437.465009]        entry_SYSCALL_64_after_hwframe+0x6e/0x76\\n[ 3437.465231]\\n               -\u003e #0 (sb_writers#10){.+.+}-{0:0}:\\n[ 3437.465471]        __lock_acquire+0x1455/0x21b0\\n[ 3437.465656]        lock_acquire+0xc6/0x2b0\\n[ 3437.465822]        mnt_want_write+0x46/0x1a0\\n[ 3437.465996]        filename_create+0x62/0x190\\n[ 3437.466175]        user_path_create+0x2d/0x50\\n[ 3437.466352]        bch2_fs_file_ioctl+0x2ec/0xc90 [bcachefs]\\n[ 3437.466617]        __x64_sys_ioctl+0x93/0xd0\\n[ 3437.466791]        do_syscall_64+0x42/0xf0\\n[ 3437.466957]        entry_SYSCALL_64_after_hwframe+0x6e/0x76\\n[ 3437.467180]\\n               other info that might help us debug this:\\n\\n[ 3437.469670] 2 locks held by bcachefs/35533:\\n               other info that might help us debug this:\\n\\n[ 3437.467507] Chain exists of:\\n                 sb_writers#10 --\u003e \u0026c-\u003esnapshot_create_lock --\u003e \u0026type-\u003es_umount_key#48\\n\\n[ 3437.467979]  Possible unsafe locking scenario:\\n\\n[ 3437.468223]        CPU0                    CPU1\\n[ 3437.468405]        ----                    ----\\n[ 3437.468585]   rlock(\u0026type-\u003es_umount_key#48);\\n[ 3437.468758]                                lock(\u0026c-\u003esnapshot_create_lock);\\n[ 3437.469030]                                lock(\u0026type-\u003es_umount_key#48);\\n[ 3437.469291]   rlock(sb_writers#10);\\n[ 3437.469434]\\n                *** DEADLOCK ***\\n\\n[ 3437.469\\n---truncated---\"}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2024-12-18T11:30:56.841Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2024-26658\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2024-12-18T11:30:56.841Z\", \"dateReserved\": \"2024-02-19T14:20:24.147Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-04-02T06:22:08.468Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}


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