cve-2022-48862
Vulnerability from cvelistv5
Published
2024-07-16 12:25
Modified
2024-11-04 12:18
Severity ?
Summary
vhost: fix hung thread due to erroneous iotlb entries
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/d9a747e6b6561280bf1791bb24c5e9e082193dadPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/e2ae38cf3d91837a493cb2093c87700ff3cbe667Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/f8d88e86e90ea1002226d7ac2430152bfea003d1Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/d9a747e6b6561280bf1791bb24c5e9e082193dadPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/e2ae38cf3d91837a493cb2093c87700ff3cbe667Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/f8d88e86e90ea1002226d7ac2430152bfea003d1Patch
Impacted products
Vendor Product Version
Linux Linux Version: 5.7
Show details on NVD website

To clipboard 

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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nvhost: fix hung thread due to erroneous iotlb entries\n\nIn vhost_iotlb_add_range_ctx(), range size can overflow to 0 when\nstart is 0 and last is ULONG_MAX. One instance where it can happen\nis when userspace sends an IOTLB message with iova=size=uaddr=0\n(vhost_process_iotlb_msg). So, an entry with size = 0, start = 0,\nlast = ULONG_MAX ends up in the iotlb. Next time a packet is sent,\niotlb_access_ok() loops indefinitely due to that erroneous entry.\n\n\tCall Trace:\n\t \u003cTASK\u003e\n\t iotlb_access_ok+0x21b/0x3e0 drivers/vhost/vhost.c:1340\n\t vq_meta_prefetch+0xbc/0x280 drivers/vhost/vhost.c:1366\n\t vhost_transport_do_send_pkt+0xe0/0xfd0 drivers/vhost/vsock.c:104\n\t vhost_worker+0x23d/0x3d0 drivers/vhost/vhost.c:372\n\t kthread+0x2e9/0x3a0 kernel/kthread.c:377\n\t ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295\n\t \u003c/TASK\u003e\n\nReported by syzbot at:\n\thttps://syzkaller.appspot.com/bug?extid=0abd373e2e50d704db87\n\nTo fix this, do two things:\n\n1. Return -EINVAL in vhost_chr_write_iter() when userspace asks to map\n   a range with size 0.\n2. Fix vhost_iotlb_add_range_ctx() to handle the range [0, ULONG_MAX]\n   by splitting it into two entries."
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    "dateReserved": "2024-07-16T11:38:08.920Z",
    "dateUpdated": "2024-11-04T12:18:02.774Z",
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    "nvd": "{\"cve\":{\"id\":\"CVE-2022-48862\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-07-16T13:15:13.100\",\"lastModified\":\"2024-11-21T07:34:14.127\",\"vulnStatus\":\"Modified\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nvhost: fix hung thread due to erroneous iotlb entries\\n\\nIn vhost_iotlb_add_range_ctx(), range size can overflow to 0 when\\nstart is 0 and last is ULONG_MAX. One instance where it can happen\\nis when userspace sends an IOTLB message with iova=size=uaddr=0\\n(vhost_process_iotlb_msg). So, an entry with size = 0, start = 0,\\nlast = ULONG_MAX ends up in the iotlb. Next time a packet is sent,\\niotlb_access_ok() loops indefinitely due to that erroneous entry.\\n\\n\\tCall Trace:\\n\\t \u003cTASK\u003e\\n\\t iotlb_access_ok+0x21b/0x3e0 drivers/vhost/vhost.c:1340\\n\\t vq_meta_prefetch+0xbc/0x280 drivers/vhost/vhost.c:1366\\n\\t vhost_transport_do_send_pkt+0xe0/0xfd0 drivers/vhost/vsock.c:104\\n\\t vhost_worker+0x23d/0x3d0 drivers/vhost/vhost.c:372\\n\\t kthread+0x2e9/0x3a0 kernel/kthread.c:377\\n\\t ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295\\n\\t \u003c/TASK\u003e\\n\\nReported by syzbot at:\\n\\thttps://syzkaller.appspot.com/bug?extid=0abd373e2e50d704db87\\n\\nTo fix this, do two things:\\n\\n1. Return -EINVAL in vhost_chr_write_iter() when userspace asks to map\\n   a range with size 0.\\n2. Fix vhost_iotlb_add_range_ctx() to handle the range [0, ULONG_MAX]\\n   by splitting it into two entries.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: vhost: corrige el hilo colgado debido a entradas err\u00f3neas de iotlb En vhost_iotlb_add_range_ctx(), el tama\u00f1o del rango puede desbordarse a 0 cuando el inicio es 0 y el \u00faltimo es ULONG_MAX. Un caso en el que puede suceder es cuando el espacio de usuario env\u00eda un mensaje IOTLB con iova=size=uaddr=0 (vhost_process_iotlb_msg). Entonces, una entrada con tama\u00f1o = 0, inicio = 0, \u00faltimo = ULONG_MAX termina en iotlb. La pr\u00f3xima vez que se env\u00ede un paquete, iotlb_access_ok() se repite indefinidamente debido a esa entrada err\u00f3nea. Seguimiento de llamadas:  iotlb_access_ok+0x21b/0x3e0 drivers/vhost/vhost.c:1340 vq_meta_prefetch+0xbc/0x280 drivers/vhost/vhost.c:1366 vhost_transport_do_send_pkt+0xe0/0xfd0 drivers/vhost/vsock.c:104 vhost_worker+ 0x23d/0x3d0 drivers/vhost/vhost.c:372 kthread+0x2e9/0x3a0 kernel/kthread.c:377 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295  Reportado por syzbot en: https ://syzkaller.appspot.com/bug?extid=0abd373e2e50d704db87 Para solucionar este problema, haga dos cosas: 1. Devuelva -EINVAL en vhost_chr_write_iter() cuando el espacio de usuario solicite asignar un rango con tama\u00f1o 0. 2. 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}


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