cve-2022-48731
Vulnerability from cvelistv5
Published
2024-06-20 11:13
Modified
2024-12-19 08:06
Severity ?
5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: mm/kmemleak: avoid scanning potential huge holes When using devm_request_free_mem_region() and devm_memremap_pages() to add ZONE_DEVICE memory, if requested free mem region's end pfn were huge(e.g., 0x400000000), the node_end_pfn() will be also huge (see move_pfn_range_to_zone()). Thus it creates a huge hole between node_start_pfn() and node_end_pfn(). We found on some AMD APUs, amdkfd requested such a free mem region and created a huge hole. In such a case, following code snippet was just doing busy test_bit() looping on the huge hole. for (pfn = start_pfn; pfn < end_pfn; pfn++) { struct page *page = pfn_to_online_page(pfn); if (!page) continue; ... } So we got a soft lockup: watchdog: BUG: soft lockup - CPU#6 stuck for 26s! [bash:1221] CPU: 6 PID: 1221 Comm: bash Not tainted 5.15.0-custom #1 RIP: 0010:pfn_to_online_page+0x5/0xd0 Call Trace: ? 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+0x44/0xae I did some tests with the patch. (1) amdgpu module unloaded before the patch: real 0m0.976s user 0m0.000s sys 0m0.968s after the patch: real 0m0.981s user 0m0.000s sys 0m0.973s (2) amdgpu module loaded before the patch: real 0m35.365s user 0m0.000s sys 0m35.354s after the patch: real 0m1.049s user 0m0.000s sys 0m1.042s
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
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/352715593e81b917ce1b321e794549815b850134
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/a5389c80992f0001ee505838fe6a8b20897ce96e
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/c10a0f877fe007021d70f9cada240f42adc2b5db
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/cebb0aceb21ad91429617a40e3a17444fabf1529
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/d3533ee20e9a0e2e8f60384da7450d43d1c63d1a
Impacted products
Vendor Product Version
Linux Linux
Show details on NVD website

To clipboard 

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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. 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[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\",\"baseScore\":5.5,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"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\"},{\"url\":\"https://git.kernel.org/stable/c/352715593e81b917ce1b321e794549815b850134\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://git.kernel.org/stable/c/a5389c80992f0001ee505838fe6a8b20897ce96e\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://git.kernel.org/stable/c/c10a0f877fe007021d70f9cada240f42adc2b5db\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://git.kernel.org/stable/c/cebb0aceb21ad91429617a40e3a17444fabf1529\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://git.kernel.org/stable/c/d3533ee20e9a0e2e8f60384da7450d43d1c63d1a\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"}]}}"
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}


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