CVE-2023-52438
Vulnerability from cvelistv5
Published
2024-02-20 18:34
Modified
2024-11-04 14:46
Severity ?
Summary
binder: fix use-after-free in shinker's callback
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/3f489c2067c5824528212b0fc18b28d51332d906Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/8ad4d580e8aff8de2a4d57c5930fcc29f1ffd4a6Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/9fa04c93f24138747807fe75b5591bb680098f56Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/a49087ab93508b60d9b8add91707a22dda832869Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/a53e15e592b4dcc91c3a3b8514e484a0bdbc53a3Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/c8c1158ffb007197f31f9d9170cf13e4f34cbb5cPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/e074686e993ff1be5f21b085a3b1b4275ccd5727Patch
Impacted products
LinuxLinux
LinuxLinux
Show details on NVD website

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          "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."
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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. 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}


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  • Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
  • Confirmed: The vulnerability is confirmed from an analyst perspective.
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  • 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.