CVE-2023-52438
Vulnerability from cvelistv5
Published
2024-02-20 18:34
Modified
2024-12-19 08:19
Severity ?
EPSS score ?
Summary
In the Linux kernel, the following vulnerability has been resolved:
binder: fix use-after-free in shinker's callback
The mmap read lock is used during the shrinker's callback, which means
that using alloc->vma pointer isn't safe as it can race with munmap().
As of commit dd2283f2605e ("mm: mmap: zap pages with read mmap_sem in
munmap") the mmap lock is downgraded after the vma has been isolated.
I was able to reproduce this issue by manually adding some delays and
triggering page reclaiming through the shrinker's debug sysfs. The
following KASAN report confirms the UAF:
==================================================================
BUG: KASAN: slab-use-after-free in zap_page_range_single+0x470/0x4b8
Read of size 8 at addr ffff356ed50e50f0 by task bash/478
CPU: 1 PID: 478 Comm: bash Not tainted 6.6.0-rc5-00055-g1c8b86a3799f-dirty #70
Hardware name: linux,dummy-virt (DT)
Call trace:
zap_page_range_single+0x470/0x4b8
binder_alloc_free_page+0x608/0xadc
__list_lru_walk_one+0x130/0x3b0
list_lru_walk_node+0xc4/0x22c
binder_shrink_scan+0x108/0x1dc
shrinker_debugfs_scan_write+0x2b4/0x500
full_proxy_write+0xd4/0x140
vfs_write+0x1ac/0x758
ksys_write+0xf0/0x1dc
__arm64_sys_write+0x6c/0x9c
Allocated by task 492:
kmem_cache_alloc+0x130/0x368
vm_area_alloc+0x2c/0x190
mmap_region+0x258/0x18bc
do_mmap+0x694/0xa60
vm_mmap_pgoff+0x170/0x29c
ksys_mmap_pgoff+0x290/0x3a0
__arm64_sys_mmap+0xcc/0x144
Freed by task 491:
kmem_cache_free+0x17c/0x3c8
vm_area_free_rcu_cb+0x74/0x98
rcu_core+0xa38/0x26d4
rcu_core_si+0x10/0x1c
__do_softirq+0x2fc/0xd24
Last potentially related work creation:
__call_rcu_common.constprop.0+0x6c/0xba0
call_rcu+0x10/0x1c
vm_area_free+0x18/0x24
remove_vma+0xe4/0x118
do_vmi_align_munmap.isra.0+0x718/0xb5c
do_vmi_munmap+0xdc/0x1fc
__vm_munmap+0x10c/0x278
__arm64_sys_munmap+0x58/0x7c
Fix this issue by performing instead a vma_lookup() which will fail to
find the vma that was isolated before the mmap lock downgrade. Note that
this option has better performance than upgrading to a mmap write lock
which would increase contention. Plus, mmap_write_trylock() has been
recently removed anyway.
References
Impacted products
| Vendor | Product | Version | |||||
|---|---|---|---|---|---|---|---|
| ▼ | Linux | Linux |
Version: dd2283f2605e3b3e9c61bcae844b34f2afa4813f Version: dd2283f2605e3b3e9c61bcae844b34f2afa4813f Version: dd2283f2605e3b3e9c61bcae844b34f2afa4813f Version: dd2283f2605e3b3e9c61bcae844b34f2afa4813f Version: dd2283f2605e3b3e9c61bcae844b34f2afa4813f Version: dd2283f2605e3b3e9c61bcae844b34f2afa4813f Version: dd2283f2605e3b3e9c61bcae844b34f2afa4813f |
||||
|
|||||||
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"nvd": "{\"cve\":{\"id\":\"CVE-2023-52438\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-02-20T21:15:08.167\",\"lastModified\":\"2024-11-21T08:39:45.667\",\"vulnStatus\":\"Modified\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nbinder: fix use-after-free in shinker\u0027s callback\\n\\nThe mmap read lock is used during the shrinker\u0027s callback, which means\\nthat using alloc-\u003evma pointer isn\u0027t safe as it can race with munmap().\\nAs of commit dd2283f2605e (\\\"mm: mmap: zap pages with read mmap_sem in\\nmunmap\\\") the mmap lock is downgraded after the vma has been isolated.\\n\\nI was able to reproduce this issue by manually adding some delays and\\ntriggering page reclaiming through the shrinker\u0027s debug sysfs. The\\nfollowing KASAN report confirms the UAF:\\n\\n ==================================================================\\n BUG: KASAN: slab-use-after-free in zap_page_range_single+0x470/0x4b8\\n Read of size 8 at addr ffff356ed50e50f0 by task bash/478\\n\\n CPU: 1 PID: 478 Comm: bash Not tainted 6.6.0-rc5-00055-g1c8b86a3799f-dirty #70\\n Hardware name: linux,dummy-virt (DT)\\n Call trace:\\n zap_page_range_single+0x470/0x4b8\\n binder_alloc_free_page+0x608/0xadc\\n __list_lru_walk_one+0x130/0x3b0\\n list_lru_walk_node+0xc4/0x22c\\n binder_shrink_scan+0x108/0x1dc\\n shrinker_debugfs_scan_write+0x2b4/0x500\\n full_proxy_write+0xd4/0x140\\n vfs_write+0x1ac/0x758\\n ksys_write+0xf0/0x1dc\\n __arm64_sys_write+0x6c/0x9c\\n\\n Allocated by task 492:\\n kmem_cache_alloc+0x130/0x368\\n vm_area_alloc+0x2c/0x190\\n mmap_region+0x258/0x18bc\\n do_mmap+0x694/0xa60\\n vm_mmap_pgoff+0x170/0x29c\\n ksys_mmap_pgoff+0x290/0x3a0\\n __arm64_sys_mmap+0xcc/0x144\\n\\n Freed by task 491:\\n kmem_cache_free+0x17c/0x3c8\\n vm_area_free_rcu_cb+0x74/0x98\\n rcu_core+0xa38/0x26d4\\n rcu_core_si+0x10/0x1c\\n __do_softirq+0x2fc/0xd24\\n\\n Last potentially related work creation:\\n __call_rcu_common.constprop.0+0x6c/0xba0\\n call_rcu+0x10/0x1c\\n vm_area_free+0x18/0x24\\n remove_vma+0xe4/0x118\\n do_vmi_align_munmap.isra.0+0x718/0xb5c\\n do_vmi_munmap+0xdc/0x1fc\\n __vm_munmap+0x10c/0x278\\n __arm64_sys_munmap+0x58/0x7c\\n\\nFix this issue by performing instead a vma_lookup() which will fail to\\nfind the vma that was isolated before the mmap lock downgrade. Note that\\nthis option has better performance than upgrading to a mmap write lock\\nwhich would increase contention. Plus, mmap_write_trylock() has been\\nrecently removed anyway.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: binder: corrige el use-after-free en la devoluci\u00f3n de llamada de shinker. El bloqueo de lectura mmap se usa durante la devoluci\u00f3n de llamada de shrinker, lo que significa que usar el puntero alloc-\u0026gt;vma no es seguro ya que puede ejecutarse con munmap(). A partir de el commit dd2283f2605e (\\\"mm: mmap: zap p\u00e1ginas con lectura mmap_sem en munmap\\\"), el bloqueo mmap se degrada despu\u00e9s de que se ha aislado el vma. Pude reproducir este problema agregando manualmente algunos retrasos y activando la recuperaci\u00f3n de p\u00e1ginas a trav\u00e9s del sistema de depuraci\u00f3n del reductor. El siguiente informe de KASAN confirma la UAF: =========================================== ======================== ERROR: KASAN: slab-use-after-free en zap_page_range_single+0x470/0x4b8 Lectura de tama\u00f1o 8 en la direcci\u00f3n ffff356ed50e50f0 por tarea bash/478 CPU: 1 PID: 478 Comm: bash No contaminado 6.6.0-rc5-00055-g1c8b86a3799f-dirty #70 Nombre de hardware: linux,dummy-virt (DT) Rastreo de llamadas: zap_page_range_single+0x470/0x4b8 binder_alloc_free_page+0x608/ 0xadc __list_lru_walk_one+0x130/0x3b0 list_lru_walk_node+0xc4/0x22c binder_shrink_scan+0x108/0x1dc encogimiento_debugfs_scan_write+0x2b4/0x500 full_proxy_write+0xd4/0x140 vfs_write+0x1ac/0x758 ksys_write+0xf0/0x1dc __arm64_sys_write+0x6c/0x9c Asignado por la tarea 492: kmem_cache_alloc+0x130/ 0x368 vm_area_alloc+0x2c/0x190 mmap_region+0x258/0x18bc do_mmap+0x694/0xa60 vm_mmap_pgoff+0x170/0x29c ksys_mmap_pgoff+0x290/0x3a0 __arm64_sys_mmap+0xcc/0x144 Liberado por tarea 491: kmem_cache_free+0x17c/0x3c8 vm_area_free_rcu_cb+0x74/0x98 rcu_core+0xa38/ 0x26d4 rcu_core_si+0x10/0x1c __do_softirq+0x2fc/0xd24 \u00daltima creaci\u00f3n de trabajo potencialmente relacionado: __call_rcu_common.constprop.0+0x6c/0xba0 call_rcu+0x10/0x1c vm_area_free+0x18/0x24 remove_vma+0xe4/0x118 do_vmi _align_munmap.isra.0+0x718/0xb5c do_vmi_munmap+0xdc/0x1fc __vm_munmap+0x10c/0x278 __arm64_sys_munmap+0x58/0x7c Solucione este problema realizando en su lugar un vma_lookup() que no podr\u00e1 encontrar el vma que estaba aislado antes de la degradaci\u00f3n del bloqueo mmap. Tenga en cuenta que esta opci\u00f3n tiene un mejor rendimiento que actualizar a un bloqueo de escritura mmap, lo que aumentar\u00eda la contenci\u00f3n. Adem\u00e1s, mmap_write_trylock() se elimin\u00f3 recientemente de todos modos.\"}],\"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:H/I:H/A:H\",\"baseScore\":7.8,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":5.9}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-416\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"4.20.0\",\"versionEndExcluding\":\"5.4.268\",\"matchCriteriaId\":\"35ADF607-EDCA-45AB-8FB6-9F2D40D47C0C\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.5.0\",\"versionEndExcluding\":\"5.10.209\",\"matchCriteriaId\":\"5D2E4F24-2FBB-4434-8598-2B1499E566B5\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.11.0\",\"versionEndExcluding\":\"5.15.148\",\"matchCriteriaId\":\"E25E1389-4B0F-407A-9C94-5908FF3EE88B\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.16.0\",\"versionEndExcluding\":\"6.1.74\",\"matchCriteriaId\":\"F7DD9841-CE11-470D-A285-A2E8E0F6640D\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.2.0\",\"versionEndExcluding\":\"6.6.13\",\"matchCriteriaId\":\"74A1FFC7-19FA-450E-BC2D-2BBD2EBF0A5F\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.7.0\",\"versionEndExcluding\":\"6.7.1\",\"matchCriteriaId\":\"664EB721-F519-48BB-B1C8-897D5990CD78\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/3f489c2067c5824528212b0fc18b28d51332d906\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/8ad4d580e8aff8de2a4d57c5930fcc29f1ffd4a6\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/9fa04c93f24138747807fe75b5591bb680098f56\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/a49087ab93508b60d9b8add91707a22dda832869\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/a53e15e592b4dcc91c3a3b8514e484a0bdbc53a3\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/c8c1158ffb007197f31f9d9170cf13e4f34cbb5c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/e074686e993ff1be5f21b085a3b1b4275ccd5727\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/3f489c2067c5824528212b0fc18b28d51332d906\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/8ad4d580e8aff8de2a4d57c5930fcc29f1ffd4a6\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/9fa04c93f24138747807fe75b5591bb680098f56\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/a49087ab93508b60d9b8add91707a22dda832869\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/a53e15e592b4dcc91c3a3b8514e484a0bdbc53a3\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/c8c1158ffb007197f31f9d9170cf13e4f34cbb5c\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/e074686e993ff1be5f21b085a3b1b4275ccd5727\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]},{\"url\":\"https://lists.debian.org/debian-lts-announce/2024/06/msg00016.html\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"}]}}"
}
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.