cve-2021-47623
Vulnerability from cvelistv5
Published
2024-07-16 11:29
Modified
2025-05-04 07:15
Severity ?
Summary
powerpc/fixmap: Fix VM debug warning on unmap
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/033fd42c18d9b2121595b6f1e8419a115f9ac5b7
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/43ae0ccc4d2722b833fb59b905af129428e06d03
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/67baac10dd5ad1e9f50e8f2659984b3b0728d54e
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/aec982603aa8cc0a21143681feb5f60ecc69d718
Impacted products
LinuxLinux
LinuxLinux
Show details on NVD website

To clipboard 

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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\npowerpc/fixmap: Fix VM debug warning on unmap\n\nUnmapping a fixmap entry is done by calling __set_fixmap()\nwith FIXMAP_PAGE_CLEAR as flags.\n\nToday, powerpc __set_fixmap() calls map_kernel_page().\n\nmap_kernel_page() is not happy when called a second time\nfor the same page.\n\n\tWARNING: CPU: 0 PID: 1 at arch/powerpc/mm/pgtable.c:194 set_pte_at+0xc/0x1e8\n\tCPU: 0 PID: 1 Comm: swapper Not tainted 5.16.0-rc3-s3k-dev-01993-g350ff07feb7d-dirty #682\n\tNIP:  c0017cd4 LR: c00187f0 CTR: 00000010\n\tREGS: e1011d50 TRAP: 0700   Not tainted  (5.16.0-rc3-s3k-dev-01993-g350ff07feb7d-dirty)\n\tMSR:  00029032 \u003cEE,ME,IR,DR,RI\u003e  CR: 42000208  XER: 00000000\n\n\tGPR00: c0165fec e1011e10 c14c0000 c0ee2550 ff800000 c0f3d000 00000000 c001686c\n\tGPR08: 00001000 b00045a9 00000001 c0f58460 c0f50000 00000000 c0007e10 00000000\n\tGPR16: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000\n\tGPR24: 00000000 00000000 c0ee2550 00000000 c0f57000 00000ff8 00000000 ff800000\n\tNIP [c0017cd4] set_pte_at+0xc/0x1e8\n\tLR [c00187f0] map_kernel_page+0x9c/0x100\n\tCall Trace:\n\t[e1011e10] [c0736c68] vsnprintf+0x358/0x6c8 (unreliable)\n\t[e1011e30] [c0165fec] __set_fixmap+0x30/0x44\n\t[e1011e40] [c0c13bdc] early_iounmap+0x11c/0x170\n\t[e1011e70] [c0c06cb0] ioremap_legacy_serial_console+0x88/0xc0\n\t[e1011e90] [c0c03634] do_one_initcall+0x80/0x178\n\t[e1011ef0] [c0c0385c] kernel_init_freeable+0xb4/0x250\n\t[e1011f20] [c0007e34] kernel_init+0x24/0x140\n\t[e1011f30] [c0016268] ret_from_kernel_thread+0x5c/0x64\n\tInstruction dump:\n\t7fe3fb78 48019689 80010014 7c630034 83e1000c 5463d97e 7c0803a6 38210010\n\t4e800020 81250000 712a0001 41820008 \u003c0fe00000\u003e 9421ffe0 93e1001c 48000030\n\nImplement unmap_kernel_page() which clears an existing pte."
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2021-47623",
    "datePublished": "2024-07-16T11:29:39.071Z",
    "dateReserved": "2024-07-16T11:26:52.956Z",
    "dateUpdated": "2025-05-04T07:15:07.770Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2021-47623\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-07-16T12:15:02.483\",\"lastModified\":\"2024-07-16T13:43:58.773\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\npowerpc/fixmap: Fix VM debug warning on unmap\\n\\nUnmapping a fixmap entry is done by calling __set_fixmap()\\nwith FIXMAP_PAGE_CLEAR as flags.\\n\\nToday, powerpc __set_fixmap() calls map_kernel_page().\\n\\nmap_kernel_page() is not happy when called a second time\\nfor the same page.\\n\\n\\tWARNING: CPU: 0 PID: 1 at arch/powerpc/mm/pgtable.c:194 set_pte_at+0xc/0x1e8\\n\\tCPU: 0 PID: 1 Comm: swapper Not tainted 5.16.0-rc3-s3k-dev-01993-g350ff07feb7d-dirty #682\\n\\tNIP:  c0017cd4 LR: c00187f0 CTR: 00000010\\n\\tREGS: e1011d50 TRAP: 0700   Not tainted  (5.16.0-rc3-s3k-dev-01993-g350ff07feb7d-dirty)\\n\\tMSR:  00029032 \u003cEE,ME,IR,DR,RI\u003e  CR: 42000208  XER: 00000000\\n\\n\\tGPR00: c0165fec e1011e10 c14c0000 c0ee2550 ff800000 c0f3d000 00000000 c001686c\\n\\tGPR08: 00001000 b00045a9 00000001 c0f58460 c0f50000 00000000 c0007e10 00000000\\n\\tGPR16: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000\\n\\tGPR24: 00000000 00000000 c0ee2550 00000000 c0f57000 00000ff8 00000000 ff800000\\n\\tNIP [c0017cd4] set_pte_at+0xc/0x1e8\\n\\tLR [c00187f0] map_kernel_page+0x9c/0x100\\n\\tCall Trace:\\n\\t[e1011e10] [c0736c68] vsnprintf+0x358/0x6c8 (unreliable)\\n\\t[e1011e30] [c0165fec] __set_fixmap+0x30/0x44\\n\\t[e1011e40] [c0c13bdc] early_iounmap+0x11c/0x170\\n\\t[e1011e70] [c0c06cb0] ioremap_legacy_serial_console+0x88/0xc0\\n\\t[e1011e90] [c0c03634] do_one_initcall+0x80/0x178\\n\\t[e1011ef0] [c0c0385c] kernel_init_freeable+0xb4/0x250\\n\\t[e1011f20] [c0007e34] kernel_init+0x24/0x140\\n\\t[e1011f30] [c0016268] ret_from_kernel_thread+0x5c/0x64\\n\\tInstruction dump:\\n\\t7fe3fb78 48019689 80010014 7c630034 83e1000c 5463d97e 7c0803a6 38210010\\n\\t4e800020 81250000 712a0001 41820008 \u003c0fe00000\u003e 9421ffe0 93e1001c 48000030\\n\\nImplement unmap_kernel_page() which clears an existing pte.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: powerpc/fixmap: corrige la advertencia de depuraci\u00f3n de VM al desasignar La desasignaci\u00f3n de una entrada de fixmap se realiza llamando a __set_fixmap() con FIXMAP_PAGE_CLEAR como indicadores. Hoy, powerpc __set_fixmap() llama a map_kernel_page(). map_kernel_page() no est\u00e1 contento cuando se le llama por segunda vez para la misma p\u00e1gina. ADVERTENCIA: CPU: 0 PID: 1 en arch/powerpc/mm/pgtable.c:194 set_pte_at+0xc/0x1e8 CPU: 0 PID: 1 Comm: swapper No contaminado 5.16.0-rc3-s3k-dev-01993-g350ff07feb7d- sucio #682 NIP: c0017cd4 LR: c00187f0 CTR: 00000010 REGS: e1011d50 TRAP: 0700 No contaminado (5.16.0-rc3-s3k-dev-01993-g350ff07feb7d-dirty) MSR: 00029032  CR: 42000208 XER: 00000000 GPR00: c0165fec e1011e10 c14c0000 c0ee2550 ff800000 c0f3d000 00000000 c001686c GPR08: 00001000 b00045a9 00000001 c 0f58460 c0f50000 00000000 c0007e10 00000000 GPR16: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 GPR24: 00000000 00000000 c0ee2550 00000000 c0f57000 00000ff8 00000000 ff800000 PIN [c0017cd4 ] set_pte_at+0xc/0x1e8 LR [c00187f0] map_kernel_page+0x9c/0x100 Seguimiento de llamadas: [e1011e10] [c0736c68] vsnprintf+0x358/0x6c8 (no confiable) [e1011e30] [c0165fec] x44 [e1011e40] [c0c13bdc] early_iounmap +0x11c/0x170 [e1011e70] [c0c06cb0] ioremap_legacy_serial_console+0x88/0xc0 [e1011e90] [c0c03634] do_one_initcall+0x80/0x178 [e1011ef0] [c0c0385c] kernel_init_freeable+0xb4 /0x250 [e1011f20] [c0007e34] kernel_init+0x24/0x140 [e1011f30 ] [c0016268] ret_from_kernel_thread+0x5c/0x64 Volcado de instrucciones: 7fe3fb78 48019689 80010014 7c630034 83e1000c 5463d97e 7c0803a6 38210010 4e800020 0 712a0001 41820008 \u0026lt;0fe00000\u0026gt; 9421ffe0 93e1001c 48000030 Implemente unmap_kernel_page() que borra un pte existente.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/033fd42c18d9b2121595b6f1e8419a115f9ac5b7\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/43ae0ccc4d2722b833fb59b905af129428e06d03\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/67baac10dd5ad1e9f50e8f2659984b3b0728d54e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/aec982603aa8cc0a21143681feb5f60ecc69d718\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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