cve-2022-48731
Vulnerability from cvelistv5
Published
2024-06-20 11:13
Modified
2024-11-04 12:15
Severity ?
5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Summary
mm/kmemleak: avoid scanning potential huge holes
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/352715593e81b917ce1b321e794549815b850134
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/a5389c80992f0001ee505838fe6a8b20897ce96e
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/c10a0f877fe007021d70f9cada240f42adc2b5db
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/cebb0aceb21ad91429617a40e3a17444fabf1529
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/d3533ee20e9a0e2e8f60384da7450d43d1c63d1a
Impacted products
LinuxLinux
LinuxLinux
Show details on NVD website

To clipboard 

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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmm/kmemleak: avoid scanning potential huge holes\n\nWhen using devm_request_free_mem_region() and devm_memremap_pages() to\nadd ZONE_DEVICE memory, if requested free mem region\u0027s end pfn were\nhuge(e.g., 0x400000000), the node_end_pfn() will be also huge (see\nmove_pfn_range_to_zone()).  Thus it creates a huge hole between\nnode_start_pfn() and node_end_pfn().\n\nWe found on some AMD APUs, amdkfd requested such a free mem region and\ncreated a huge hole.  In such a case, following code snippet was just\ndoing busy test_bit() looping on the huge hole.\n\n  for (pfn = start_pfn; pfn \u003c end_pfn; pfn++) {\n\tstruct page *page = pfn_to_online_page(pfn);\n\t\tif (!page)\n\t\t\tcontinue;\n\t...\n  }\n\nSo we got a soft lockup:\n\n  watchdog: BUG: soft lockup - CPU#6 stuck for 26s! [bash:1221]\n  CPU: 6 PID: 1221 Comm: bash Not tainted 5.15.0-custom #1\n  RIP: 0010:pfn_to_online_page+0x5/0xd0\n  Call Trace:\n    ? kmemleak_scan+0x16a/0x440\n    kmemleak_write+0x306/0x3a0\n    ? common_file_perm+0x72/0x170\n    full_proxy_write+0x5c/0x90\n    vfs_write+0xb9/0x260\n    ksys_write+0x67/0xe0\n    __x64_sys_write+0x1a/0x20\n    do_syscall_64+0x3b/0xc0\n    entry_SYSCALL_64_after_hwframe+0x44/0xae\n\nI did some tests with the patch.\n\n(1) amdgpu module unloaded\n\nbefore the patch:\n\n  real    0m0.976s\n  user    0m0.000s\n  sys     0m0.968s\n\nafter the patch:\n\n  real    0m0.981s\n  user    0m0.000s\n  sys     0m0.973s\n\n(2) amdgpu module loaded\n\nbefore the patch:\n\n  real    0m35.365s\n  user    0m0.000s\n  sys     0m35.354s\n\nafter the patch:\n\n  real    0m1.049s\n  user    0m0.000s\n  sys     0m1.042s"
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    "cveId": "CVE-2022-48731",
    "datePublished": "2024-06-20T11:13:19.407Z",
    "dateReserved": "2024-06-20T11:09:39.053Z",
    "dateUpdated": "2024-11-04T12:15:25.999Z",
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    "nvd": "{\"cve\":{\"id\":\"CVE-2022-48731\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-06-20T12:15:11.517\",\"lastModified\":\"2024-10-29T19:35:01.210\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nmm/kmemleak: avoid scanning potential huge holes\\n\\nWhen using devm_request_free_mem_region() and devm_memremap_pages() to\\nadd ZONE_DEVICE memory, if requested free mem region\u0027s end pfn were\\nhuge(e.g., 0x400000000), the node_end_pfn() will be also huge (see\\nmove_pfn_range_to_zone()).  Thus it creates a huge hole between\\nnode_start_pfn() and node_end_pfn().\\n\\nWe found on some AMD APUs, amdkfd requested such a free mem region and\\ncreated a huge hole.  In such a case, following code snippet was just\\ndoing busy test_bit() looping on the huge hole.\\n\\n  for (pfn = start_pfn; pfn \u003c end_pfn; pfn++) {\\n\\tstruct page *page = pfn_to_online_page(pfn);\\n\\t\\tif (!page)\\n\\t\\t\\tcontinue;\\n\\t...\\n  }\\n\\nSo we got a soft lockup:\\n\\n  watchdog: BUG: soft lockup - CPU#6 stuck for 26s! [bash:1221]\\n  CPU: 6 PID: 1221 Comm: bash Not tainted 5.15.0-custom #1\\n  RIP: 0010:pfn_to_online_page+0x5/0xd0\\n  Call Trace:\\n    ? kmemleak_scan+0x16a/0x440\\n    kmemleak_write+0x306/0x3a0\\n    ? common_file_perm+0x72/0x170\\n    full_proxy_write+0x5c/0x90\\n    vfs_write+0xb9/0x260\\n    ksys_write+0x67/0xe0\\n    __x64_sys_write+0x1a/0x20\\n    do_syscall_64+0x3b/0xc0\\n    entry_SYSCALL_64_after_hwframe+0x44/0xae\\n\\nI did some tests with the patch.\\n\\n(1) amdgpu module unloaded\\n\\nbefore the patch:\\n\\n  real    0m0.976s\\n  user    0m0.000s\\n  sys     0m0.968s\\n\\nafter the patch:\\n\\n  real    0m0.981s\\n  user    0m0.000s\\n  sys     0m0.973s\\n\\n(2) amdgpu module loaded\\n\\nbefore the patch:\\n\\n  real    0m35.365s\\n  user    0m0.000s\\n  sys     0m35.354s\\n\\nafter the patch:\\n\\n  real    0m1.049s\\n  user    0m0.000s\\n  sys     0m1.042s\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: mm/kmemleak: evita escanear posibles agujeros enormes. Al usar devm_request_free_mem_region() y devm_memremap_pages() para agregar memoria ZONE_DEVICE, si se solicitaba, el pfn final de la regi\u00f3n de memoria libre era enorme (por ejemplo, 0x400000000), el node_end_pfn() tambi\u00e9n ser\u00e1 enorme (ver move_pfn_range_to_zone()). Por lo tanto, crea un enorme agujero entre node_start_pfn() y node_end_pfn(). Descubrimos que en algunas APU AMD, AMDKFD solicit\u00f3 una regi\u00f3n de memoria libre y cre\u00f3 un agujero enorme. En tal caso, el siguiente fragmento de c\u00f3digo simplemente estaba haciendo un bucle test_bit() ocupado en el enorme agujero. for (pfn = start_pfn; pfn \u0026lt; end_pfn; pfn++) { estructura p\u00e1gina *p\u00e1gina = pfn_to_online_page(pfn); si (!p\u00e1gina) contin\u00faa; ... } Entonces obtuvimos un bloqueo suave: perro guardi\u00e1n: ERROR: bloqueo suave - \u00a1CPU#6 bloqueada durante 26 segundos! [bash:1221] CPU: 6 PID: 1221 Comm: bash No contaminado 5.15.0-custom #1 RIP: 0010:pfn_to_online_page+0x5/0xd0 Seguimiento de llamadas:? kmemleak_scan+0x16a/0x440 kmemleak_write+0x306/0x3a0 ? common_file_perm+0x72/0x170 full_proxy_write+0x5c/0x90 vfs_write+0xb9/0x260 ksys_write+0x67/0xe0 __x64_sys_write+0x1a/0x20 do_syscall_64+0x3b/0xc0 Entry_SYSCALL_64_after_hwframe+0x4 4/0xae Hice algunas pruebas con el parche. (1) m\u00f3dulo amdgpu descargado antes del parche: usuario real 0m0.976s 0m0.000s sys 0m0.968s despu\u00e9s del parche: usuario real 0m0.981s 0m0.000s sys 0m0.973s (2) m\u00f3dulo amdgpu cargado antes del parche: real 0m35 .365s usuario 0m0.000s sys 0m35.354s despu\u00e9s del parche: real 0m1.049s usuario 0m0.000s sys 0m1.042s\"}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\",\"baseScore\":5.5,\"baseSeverity\":\"MEDIUM\"},\"exploitabilityScore\":1.8,\"impactScore\":3.6}]},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/352715593e81b917ce1b321e794549815b850134\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/a5389c80992f0001ee505838fe6a8b20897ce96e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/c10a0f877fe007021d70f9cada240f42adc2b5db\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/cebb0aceb21ad91429617a40e3a17444fabf1529\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/d3533ee20e9a0e2e8f60384da7450d43d1c63d1a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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