CVE-2024-26658
Vulnerability from cvelistv5
Published
2024-04-02 06:22
Modified
2024-11-05 09:13
Severity ?
Summary
bcachefs: grab s_umount only if snapshotting
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/2acc59dd88d27ad69b66ded80df16c042b04eeec
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/5b41d3fd04c6757b9c2a60a0c5b2609cae9999df
Impacted products
LinuxLinux
LinuxLinux
Show details on NVD website

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{
  "containers": {
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            "other": {
              "content": {
                "id": "CVE-2024-26658",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2024-04-02T18:32:11.328360Z",
                "version": "2.0.3"
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              "type": "ssvc"
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        "providerMetadata": {
          "dateUpdated": "2024-06-04T17:48:42.039Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      },
      {
        "providerMetadata": {
          "dateUpdated": "2024-08-02T00:14:12.825Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
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        "references": [
          {
            "tags": [
              "x_transferred"
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            "url": "https://git.kernel.org/stable/c/5b41d3fd04c6757b9c2a60a0c5b2609cae9999df"
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          {
            "tags": [
              "x_transferred"
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            "url": "https://git.kernel.org/stable/c/2acc59dd88d27ad69b66ded80df16c042b04eeec"
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        ],
        "title": "CVE Program Container"
      }
    ],
    "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": [
            {
              "lessThan": "5b41d3fd04c6",
              "status": "affected",
              "version": "1da177e4c3f4",
              "versionType": "git"
            },
            {
              "lessThan": "2acc59dd88d2",
              "status": "affected",
              "version": "1da177e4c3f4",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "fs/bcachefs/fs-ioctl.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThanOrEqual": "6.7.*",
              "status": "unaffected",
              "version": "6.7.5",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.8",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "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": {
        "dateUpdated": "2024-11-05T09:13:21.540Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "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-9e1c9544281a"
      }
    }
  },
  "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": "2024-11-05T09:13:21.540Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2024-26658\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-04-02T07:15:42.903\",\"lastModified\":\"2024-04-02T12:50:42.233\",\"vulnStatus\":\"Awaiting Analysis\",\"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\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/2acc59dd88d27ad69b66ded80df16c042b04eeec\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/5b41d3fd04c6757b9c2a60a0c5b2609cae9999df\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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