fkie_cve-2024-56613
Vulnerability from fkie_nvd
Published
2024-12-27 15:15
Modified
2025-01-08 16:51
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved:
sched/numa: fix memory leak due to the overwritten vma->numab_state
[Problem Description]
When running the hackbench program of LTP, the following memory leak is
reported by kmemleak.
# /opt/ltp/testcases/bin/hackbench 20 thread 1000
Running with 20*40 (== 800) tasks.
# dmesg | grep kmemleak
...
kmemleak: 480 new suspected memory leaks (see /sys/kernel/debug/kmemleak)
kmemleak: 665 new suspected memory leaks (see /sys/kernel/debug/kmemleak)
# cat /sys/kernel/debug/kmemleak
unreferenced object 0xffff888cd8ca2c40 (size 64):
comm "hackbench", pid 17142, jiffies 4299780315
hex dump (first 32 bytes):
ac 74 49 00 01 00 00 00 4c 84 49 00 01 00 00 00 .tI.....L.I.....
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
backtrace (crc bff18fd4):
[<ffffffff81419a89>] __kmalloc_cache_noprof+0x2f9/0x3f0
[<ffffffff8113f715>] task_numa_work+0x725/0xa00
[<ffffffff8110f878>] task_work_run+0x58/0x90
[<ffffffff81ddd9f8>] syscall_exit_to_user_mode+0x1c8/0x1e0
[<ffffffff81dd78d5>] do_syscall_64+0x85/0x150
[<ffffffff81e0012b>] entry_SYSCALL_64_after_hwframe+0x76/0x7e
...
This issue can be consistently reproduced on three different servers:
* a 448-core server
* a 256-core server
* a 192-core server
[Root Cause]
Since multiple threads are created by the hackbench program (along with
the command argument 'thread'), a shared vma might be accessed by two or
more cores simultaneously. When two or more cores observe that
vma->numab_state is NULL at the same time, vma->numab_state will be
overwritten.
Although current code ensures that only one thread scans the VMAs in a
single 'numa_scan_period', there might be a chance for another thread
to enter in the next 'numa_scan_period' while we have not gotten till
numab_state allocation [1].
Note that the command `/opt/ltp/testcases/bin/hackbench 50 process 1000`
cannot the reproduce the issue. It is verified with 200+ test runs.
[Solution]
Use the cmpxchg atomic operation to ensure that only one thread executes
the vma->numab_state assignment.
[1] https://lore.kernel.org/lkml/1794be3c-358c-4cdc-a43d-a1f841d91ef7@amd.com/
References
Impacted products
Vendor | Product | Version | |
---|---|---|---|
linux | linux_kernel | * | |
linux | linux_kernel | * | |
linux | linux_kernel | 6.13 |
{ "configurations": [ { "nodes": [ { "cpeMatch": [ { "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "26B700EE-A79C-4047-8214-099FACC0BEB5", "versionEndExcluding": "6.6.66", "versionStartIncluding": "6.4", "vulnerable": true }, { "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "9501D045-7A94-42CA-8B03-821BE94A65B7", "versionEndExcluding": "6.12.5", "versionStartIncluding": "6.7", "vulnerable": true }, { "criteria": "cpe:2.3:o:linux:linux_kernel:6.13:rc1:*:*:*:*:*:*", "matchCriteriaId": "62567B3C-6CEE-46D0-BC2E-B3717FBF7D13", "vulnerable": true } ], "negate": false, "operator": "OR" } ] } ], "cveTags": [], "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsched/numa: fix memory leak due to the overwritten vma-\u003enumab_state\n\n[Problem Description]\nWhen running the hackbench program of LTP, the following memory leak is\nreported by kmemleak.\n\n # /opt/ltp/testcases/bin/hackbench 20 thread 1000\n Running with 20*40 (== 800) tasks.\n\n # dmesg | grep kmemleak\n ...\n kmemleak: 480 new suspected memory leaks (see /sys/kernel/debug/kmemleak)\n kmemleak: 665 new suspected memory leaks (see /sys/kernel/debug/kmemleak)\n\n # cat /sys/kernel/debug/kmemleak\n unreferenced object 0xffff888cd8ca2c40 (size 64):\n comm \"hackbench\", pid 17142, jiffies 4299780315\n hex dump (first 32 bytes):\n ac 74 49 00 01 00 00 00 4c 84 49 00 01 00 00 00 .tI.....L.I.....\n 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................\n backtrace (crc bff18fd4):\n [\u003cffffffff81419a89\u003e] __kmalloc_cache_noprof+0x2f9/0x3f0\n [\u003cffffffff8113f715\u003e] task_numa_work+0x725/0xa00\n [\u003cffffffff8110f878\u003e] task_work_run+0x58/0x90\n [\u003cffffffff81ddd9f8\u003e] syscall_exit_to_user_mode+0x1c8/0x1e0\n [\u003cffffffff81dd78d5\u003e] do_syscall_64+0x85/0x150\n [\u003cffffffff81e0012b\u003e] entry_SYSCALL_64_after_hwframe+0x76/0x7e\n ...\n\nThis issue can be consistently reproduced on three different servers:\n * a 448-core server\n * a 256-core server\n * a 192-core server\n\n[Root Cause]\nSince multiple threads are created by the hackbench program (along with\nthe command argument \u0027thread\u0027), a shared vma might be accessed by two or\nmore cores simultaneously. When two or more cores observe that\nvma-\u003enumab_state is NULL at the same time, vma-\u003enumab_state will be\noverwritten.\n\nAlthough current code ensures that only one thread scans the VMAs in a\nsingle \u0027numa_scan_period\u0027, there might be a chance for another thread\nto enter in the next \u0027numa_scan_period\u0027 while we have not gotten till\nnumab_state allocation [1].\n\nNote that the command `/opt/ltp/testcases/bin/hackbench 50 process 1000`\ncannot the reproduce the issue. It is verified with 200+ test runs.\n\n[Solution]\nUse the cmpxchg atomic operation to ensure that only one thread executes\nthe vma-\u003enumab_state assignment.\n\n[1] https://lore.kernel.org/lkml/1794be3c-358c-4cdc-a43d-a1f841d91ef7@amd.com/" }, { "lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: sched/numa: se corrige la p\u00e9rdida de memoria debido a la sobrescritura de vma-\u0026gt;numab_state [Descripci\u00f3n del problema] Al ejecutar el programa hackbench de LTP, kmemleak informa la siguiente p\u00e9rdida de memoria. # /opt/ltp/testcases/bin/hackbench 20 thread 1000 Se ejecuta con 20*40 (== 800) tareas. # dmesg | grep kmemleak ... kmemleak: 480 nuevas fugas de memoria sospechosas (consulte /sys/kernel/debug/kmemleak) kmemleak: 665 nuevas fugas de memoria sospechosas (consulte /sys/kernel/debug/kmemleak) # cat /sys/kernel/debug/kmemleak objeto sin referencia 0xffff888cd8ca2c40 (tama\u00f1o 64): comm \"hackbench\", pid 17142, jiffies 4299780315 volcado hexadecimal (primeros 32 bytes): ac 74 49 00 01 00 00 00 4c 84 49 00 01 00 00 00 .tI.....LI.... 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ seguimiento inverso (crc bff18fd4): [] __kmalloc_cache_noprof+0x2f9/0x3f0 [] tarea_numa_work+0x725/0xa00 [] tarea_work_run+0x58/0x90 [] llamada_al_sistema_salir_al_modo_usuario+0x1c8/0x1e0 [] hacer_llamada_al_sistema_64+0x85/0x150 [] entry_SYSCALL_64_after_hwframe+0x76/0x7e ... Este problema se puede reproducir consistentemente en tres servidores diferentes: * un servidor de 448 n\u00facleos * un servidor de 256 n\u00facleos * un servidor de 192 n\u00facleos [Causa ra\u00edz] Dado que el programa hackbench crea m\u00faltiples subprocesos (junto con el argumento de comando \u0027thread\u0027), dos o m\u00e1s n\u00facleos pueden acceder simult\u00e1neamente a un VMA compartido. Cuando dos o m\u00e1s n\u00facleos observan que vma-\u0026gt;numab_state es NULL al mismo tiempo, se sobrescribir\u00e1 vma-\u0026gt;numab_state. Aunque el c\u00f3digo actual garantiza que solo un subproceso escanee los VMA en un solo \u0027numa_scan_period\u0027, puede haber una posibilidad de que otro subproceso ingrese en el siguiente \u0027numa_scan_period\u0027 mientras no hayamos obtenido hasta la asignaci\u00f3n de numab_state [1]. Tenga en cuenta que el comando `/opt/ltp/testcases/bin/hackbench 50 process 1000` no puede reproducir el problema. Esto se ha verificado con m\u00e1s de 200 ejecuciones de pruebas. [Soluci\u00f3n] Utilice la operaci\u00f3n at\u00f3mica cmpxchg para asegurarse de que solo un subproceso ejecute la asignaci\u00f3n vma-\u0026gt;numab_state. [1] https://lore.kernel.org/lkml/1794be3c-358c-4cdc-a43d-a1f841d91ef7@amd.com/" } ], "id": "CVE-2024-56613", "lastModified": "2025-01-08T16:51:18.680", "metrics": { "cvssMetricV31": [ { "cvssData": { "attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 5.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1" }, "exploitabilityScore": 1.8, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary" } ] }, "published": "2024-12-27T15:15:20.793", "references": [ { "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": [ "Patch" ], "url": "https://git.kernel.org/stable/c/5f1b64e9a9b7ee9cfd32c6b2fab796e29bfed075" }, { "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": [ "Patch" ], "url": "https://git.kernel.org/stable/c/8f149bcc4d91ac92b32ff4949b291e6ed883dc42" }, { "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": [ "Patch" ], "url": "https://git.kernel.org/stable/c/a71ddd5b87cda687efa28e049e85e923689bcef9" } ], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [ { "description": [ { "lang": "en", "value": "CWE-401" } ], "source": "nvd@nist.gov", "type": "Primary" } ] }
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Sightings
Author | Source | Type | Date |
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Nomenclature
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- Confirmed: The vulnerability is confirmed from an analyst perspective.
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- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.