cve-2024-35877
Vulnerability from cvelistv5
Published
2024-05-19 08:34
Modified
2024-08-02 03:21
Severity
Summary
x86/mm/pat: fix VM_PAT handling in COW mappings
References
SourceURLTags
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/04c35ab3bdae7fefbd7c7a7355f29fa03a035221
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/09e6bb53217bf388a0d2fd7fb21e74ab9dffc173
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/1341e4b32e1fb1b0acd002ccd56f07bd32f2abc6
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/51b7841f3fe84606ec0bd8da859d22e05e5419ec
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/7cfee26d1950250b14c5cb0a37b142f3fcc6396a
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/97e93367e82752e475a33839a80b33bdbef1209f
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/c2b2430b48f3c9eaccd2c3d2ad75bb540d4952f4
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/f18681daaec9665a15c5e7e0f591aad5d0ac622b
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://lists.debian.org/debian-lts-announce/2024/06/msg00017.html
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://lists.debian.org/debian-lts-announce/2024/06/msg00020.html
Impacted products
VendorProduct
LinuxLinux
LinuxLinux
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nx86/mm/pat: fix VM_PAT handling in COW mappings\n\nPAT handling won\u0027t do the right thing in COW mappings: the first PTE (or,\nin fact, all PTEs) can be replaced during write faults to point at anon\nfolios.  Reliably recovering the correct PFN and cachemode using\nfollow_phys() from PTEs will not work in COW mappings.\n\nUsing follow_phys(), we might just get the address+protection of the anon\nfolio (which is very wrong), or fail on swap/nonswap entries, failing\nfollow_phys() and triggering a WARN_ON_ONCE() in untrack_pfn() and\ntrack_pfn_copy(), not properly calling free_pfn_range().\n\nIn free_pfn_range(), we either wouldn\u0027t call memtype_free() or would call\nit with the wrong range, possibly leaking memory.\n\nTo fix that, let\u0027s update follow_phys() to refuse returning anon folios,\nand fallback to using the stored PFN inside vma-\u003evm_pgoff for COW mappings\nif we run into that.\n\nWe will now properly handle untrack_pfn() with COW mappings, where we\ndon\u0027t need the cachemode.  We\u0027ll have to fail fork()-\u003etrack_pfn_copy() if\nthe first page was replaced by an anon folio, though: we\u0027d have to store\nthe cachemode in the VMA to make this work, likely growing the VMA size.\n\nFor now, lets keep it simple and let track_pfn_copy() just fail in that\ncase: it would have failed in the past with swap/nonswap entries already,\nand it would have done the wrong thing with anon folios.\n\nSimple reproducer to trigger the WARN_ON_ONCE() in untrack_pfn():\n\n\u003c--- C reproducer ---\u003e\n #include \u003cstdio.h\u003e\n #include \u003csys/mman.h\u003e\n #include \u003cunistd.h\u003e\n #include \u003cliburing.h\u003e\n\n int main(void)\n {\n         struct io_uring_params p = {};\n         int ring_fd;\n         size_t size;\n         char *map;\n\n         ring_fd = io_uring_setup(1, \u0026p);\n         if (ring_fd \u003c 0) {\n                 perror(\"io_uring_setup\");\n                 return 1;\n         }\n         size = p.sq_off.array + p.sq_entries * sizeof(unsigned);\n\n         /* Map the submission queue ring MAP_PRIVATE */\n         map = mmap(0, size, PROT_READ | PROT_WRITE, MAP_PRIVATE,\n                    ring_fd, IORING_OFF_SQ_RING);\n         if (map == MAP_FAILED) {\n                 perror(\"mmap\");\n                 return 1;\n         }\n\n         /* We have at least one page. Let\u0027s COW it. */\n         *map = 0;\n         pause();\n         return 0;\n }\n\u003c--- C reproducer ---\u003e\n\nOn a system with 16 GiB RAM and swap configured:\n # ./iouring \u0026\n # memhog 16G\n # killall iouring\n[  301.552930] ------------[ cut here ]------------\n[  301.553285] WARNING: CPU: 7 PID: 1402 at arch/x86/mm/pat/memtype.c:1060 untrack_pfn+0xf4/0x100\n[  301.553989] Modules linked in: binfmt_misc nft_fib_inet nft_fib_ipv4 nft_fib_ipv6 nft_fib nft_reject_g\n[  301.558232] CPU: 7 PID: 1402 Comm: iouring Not tainted 6.7.5-100.fc38.x86_64 #1\n[  301.558772] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebu4\n[  301.559569] RIP: 0010:untrack_pfn+0xf4/0x100\n[  301.559893] Code: 75 c4 eb cf 48 8b 43 10 8b a8 e8 00 00 00 3b 6b 28 74 b8 48 8b 7b 30 e8 ea 1a f7 000\n[  301.561189] RSP: 0018:ffffba2c0377fab8 EFLAGS: 00010282\n[  301.561590] RAX: 00000000ffffffea RBX: ffff9208c8ce9cc0 RCX: 000000010455e047\n[  301.562105] RDX: 07fffffff0eb1e0a RSI: 0000000000000000 RDI: ffff9208c391d200\n[  301.562628] RBP: 0000000000000000 R08: ffffba2c0377fab8 R09: 0000000000000000\n[  301.563145] R10: ffff9208d2292d50 R11: 0000000000000002 R12: 00007fea890e0000\n[  301.563669] R13: 0000000000000000 R14: ffffba2c0377fc08 R15: 0000000000000000\n[  301.564186] FS:  0000000000000000(0000) GS:ffff920c2fbc0000(0000) knlGS:0000000000000000\n[  301.564773] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n[  301.565197] CR2: 00007fea88ee8a20 CR3: 00000001033a8000 CR4: 0000000000750ef0\n[  301.565725] PKRU: 55555554\n[  301.565944] Call Trace:\n[  301.566148]  \u003cTASK\u003e\n[  301.566325]  ? untrack_pfn+0xf4/0x100\n[  301.566618]  ? __warn+0x81/0x130\n[  301.566876]  ? untrack_pfn+0xf4/0x100\n[  3\n---truncated---"
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        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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        {
          "url": "https://git.kernel.org/stable/c/09e6bb53217bf388a0d2fd7fb21e74ab9dffc173"
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          "url": "https://git.kernel.org/stable/c/c2b2430b48f3c9eaccd2c3d2ad75bb540d4952f4"
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        {
          "url": "https://git.kernel.org/stable/c/7cfee26d1950250b14c5cb0a37b142f3fcc6396a"
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          "url": "https://git.kernel.org/stable/c/97e93367e82752e475a33839a80b33bdbef1209f"
        },
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          "url": "https://git.kernel.org/stable/c/51b7841f3fe84606ec0bd8da859d22e05e5419ec"
        },
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          "url": "https://git.kernel.org/stable/c/1341e4b32e1fb1b0acd002ccd56f07bd32f2abc6"
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        },
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        {
          "url": "https://lists.debian.org/debian-lts-announce/2024/06/msg00020.html"
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      ],
      "title": "x86/mm/pat: fix VM_PAT handling in COW mappings",
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  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2024-35877",
    "datePublished": "2024-05-19T08:34:34.604Z",
    "dateReserved": "2024-05-17T13:50:33.110Z",
    "dateUpdated": "2024-08-02T03:21:48.797Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2024-35877\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-05-19T09:15:08.990\",\"lastModified\":\"2024-06-27T12:15:25.717\",\"vulnStatus\":\"Awaiting Analysis\",\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nx86/mm/pat: fix VM_PAT handling in COW mappings\\n\\nPAT handling won\u0027t do the right thing in COW mappings: the first PTE (or,\\nin fact, all PTEs) can be replaced during write faults to point at anon\\nfolios.  Reliably recovering the correct PFN and cachemode using\\nfollow_phys() from PTEs will not work in COW mappings.\\n\\nUsing follow_phys(), we might just get the address+protection of the anon\\nfolio (which is very wrong), or fail on swap/nonswap entries, failing\\nfollow_phys() and triggering a WARN_ON_ONCE() in untrack_pfn() and\\ntrack_pfn_copy(), not properly calling free_pfn_range().\\n\\nIn free_pfn_range(), we either wouldn\u0027t call memtype_free() or would call\\nit with the wrong range, possibly leaking memory.\\n\\nTo fix that, let\u0027s update follow_phys() to refuse returning anon folios,\\nand fallback to using the stored PFN inside vma-\u003evm_pgoff for COW mappings\\nif we run into that.\\n\\nWe will now properly handle untrack_pfn() with COW mappings, where we\\ndon\u0027t need the cachemode.  We\u0027ll have to fail fork()-\u003etrack_pfn_copy() if\\nthe first page was replaced by an anon folio, though: we\u0027d have to store\\nthe cachemode in the VMA to make this work, likely growing the VMA size.\\n\\nFor now, lets keep it simple and let track_pfn_copy() just fail in that\\ncase: it would have failed in the past with swap/nonswap entries already,\\nand it would have done the wrong thing with anon folios.\\n\\nSimple reproducer to trigger the WARN_ON_ONCE() in untrack_pfn():\\n\\n\u003c--- C reproducer ---\u003e\\n #include \u003cstdio.h\u003e\\n #include \u003csys/mman.h\u003e\\n #include \u003cunistd.h\u003e\\n #include \u003cliburing.h\u003e\\n\\n int main(void)\\n {\\n         struct io_uring_params p = {};\\n         int ring_fd;\\n         size_t size;\\n         char *map;\\n\\n         ring_fd = io_uring_setup(1, \u0026p);\\n         if (ring_fd \u003c 0) {\\n                 perror(\\\"io_uring_setup\\\");\\n                 return 1;\\n         }\\n         size = p.sq_off.array + p.sq_entries * sizeof(unsigned);\\n\\n         /* Map the submission queue ring MAP_PRIVATE */\\n         map = mmap(0, size, PROT_READ | PROT_WRITE, MAP_PRIVATE,\\n                    ring_fd, IORING_OFF_SQ_RING);\\n         if (map == MAP_FAILED) {\\n                 perror(\\\"mmap\\\");\\n                 return 1;\\n         }\\n\\n         /* We have at least one page. Let\u0027s COW it. */\\n         *map = 0;\\n         pause();\\n         return 0;\\n }\\n\u003c--- C reproducer ---\u003e\\n\\nOn a system with 16 GiB RAM and swap configured:\\n # ./iouring \u0026\\n # memhog 16G\\n # killall iouring\\n[  301.552930] ------------[ cut here ]------------\\n[  301.553285] WARNING: CPU: 7 PID: 1402 at arch/x86/mm/pat/memtype.c:1060 untrack_pfn+0xf4/0x100\\n[  301.553989] Modules linked in: binfmt_misc nft_fib_inet nft_fib_ipv4 nft_fib_ipv6 nft_fib nft_reject_g\\n[  301.558232] CPU: 7 PID: 1402 Comm: iouring Not tainted 6.7.5-100.fc38.x86_64 #1\\n[  301.558772] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebu4\\n[  301.559569] RIP: 0010:untrack_pfn+0xf4/0x100\\n[  301.559893] Code: 75 c4 eb cf 48 8b 43 10 8b a8 e8 00 00 00 3b 6b 28 74 b8 48 8b 7b 30 e8 ea 1a f7 000\\n[  301.561189] RSP: 0018:ffffba2c0377fab8 EFLAGS: 00010282\\n[  301.561590] RAX: 00000000ffffffea RBX: ffff9208c8ce9cc0 RCX: 000000010455e047\\n[  301.562105] RDX: 07fffffff0eb1e0a RSI: 0000000000000000 RDI: ffff9208c391d200\\n[  301.562628] RBP: 0000000000000000 R08: ffffba2c0377fab8 R09: 0000000000000000\\n[  301.563145] R10: ffff9208d2292d50 R11: 0000000000000002 R12: 00007fea890e0000\\n[  301.563669] R13: 0000000000000000 R14: ffffba2c0377fc08 R15: 0000000000000000\\n[  301.564186] FS:  0000000000000000(0000) GS:ffff920c2fbc0000(0000) knlGS:0000000000000000\\n[  301.564773] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\\n[  301.565197] CR2: 00007fea88ee8a20 CR3: 00000001033a8000 CR4: 0000000000750ef0\\n[  301.565725] PKRU: 55555554\\n[  301.565944] Call Trace:\\n[  301.566148]  \u003cTASK\u003e\\n[  301.566325]  ? untrack_pfn+0xf4/0x100\\n[  301.566618]  ? __warn+0x81/0x130\\n[  301.566876]  ? untrack_pfn+0xf4/0x100\\n[  3\\n---truncated---\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: x86/mm/pat: corrige el manejo de VM_PAT en asignaciones COW El manejo de PAT no funcionar\u00e1 correctamente en las asignaciones COW: la primera PTE (o, de hecho, todas las PTE) pueden ser reemplazado durante fallos de escritura para se\u00f1alar folios an\u00f3nimos. Recuperar de manera confiable el PFN y el modo de cach\u00e9 correctos usando follow_phys() de las PTE no funcionar\u00e1 en las asignaciones COW. Usando follow_phys(), podr\u00edamos obtener la direcci\u00f3n+protecci\u00f3n de la publicaci\u00f3n an\u00f3nima (lo cual es muy incorrecto), o fallar en las entradas de intercambio/no intercambio, fallando en follow_phys() y activando un WARN_ON_ONCE() en untrack_pfn() y track_pfn_copy() , no llamando correctamente a free_pfn_range(). En free_pfn_range(), no llamar\u00edamos a memtype_free() o lo llamar\u00edamos con el rango incorrecto, posiblemente perdiendo memoria. Para solucionarlo, actualicemos follow_phys() para rechazar la devoluci\u00f3n de publicaciones an\u00f3nimas y recurramos al uso del PFN almacenado dentro de vma-\u0026gt;vm_pgoff para asignaciones COW si nos encontramos con eso. Ahora manejaremos adecuadamente untrack_pfn() con asignaciones COW, donde no necesitamos el modo cach\u00e9. Sin embargo, tendremos que fallar fork()-\u0026gt;track_pfn_copy() si la primera p\u00e1gina fue reemplazada por una publicaci\u00f3n an\u00f3nima: tendr\u00edamos que almacenar el modo de cach\u00e9 en el VMA para que esto funcione, probablemente aumentando el tama\u00f1o del VMA. Por ahora, manteng\u00e1moslo simple y dejemos que track_pfn_copy() simplemente falle en ese caso: ya habr\u00eda fallado en el pasado con entradas de intercambio/no intercambio, y habr\u00eda hecho algo incorrecto con folios an\u00f3nimos. Reproductor simple para activar WARN_ON_ONCE() en untrack_pfn(): \u0026lt;--- Reproductor C ---\u0026gt; #include  #include  #include  #include  int main(void) { struct io_uring_params p = {}; int anillo_fd; tama\u00f1o_t tama\u00f1o; carb\u00f3n *mapa; ring_fd = io_uring_setup(1, \u0026amp;p); if (ring_fd \u0026lt; 0) { perror(\\\"io_uring_setup\\\"); devolver 1; } tama\u00f1o = p.sq_off.array + p.sq_entries * tama\u00f1o de (sin firmar); /* Asigna el anillo de cola de env\u00edo MAP_PRIVATE */ map = mmap(0, size, PROT_READ | PROT_WRITE, MAP_PRIVATE, ring_fd, IORING_OFF_SQ_RING); if (mapa == MAP_FAILED) { perror(\\\"mmap\\\"); devolver 1; } /* Tenemos al menos una p\u00e1gina. Vamos a acobardarnos. */ *mapa = 0; pausa(); devolver 0; } \u0026lt;--- Reproductor C ---\u0026gt; En un sistema con 16 GiB de RAM y swap configurado: # ./iouring \u0026amp; # memhog 16G # killall iouring [ 301.552930] ------------[ cut aqu\u00ed ]------------ [ 301.553285] ADVERTENCIA: CPU: 7 PID: 1402 en arch/x86/mm/pat/memtype.c:1060 untrack_pfn+0xf4/0x100 [ 301.553989] M\u00f3dulos vinculados en : binfmt_misc nft_fib_inet nft_fib_ipv4 nft_fib_ipv6 nft_fib nft_reject_g [ 301.558232] CPU: 7 PID: 1402 Comm: iouring No contaminado 6.7.5-100.fc38.x86_64 #1 [ 301.558772] Nombre del hardware: PC est\u00e1ndar QEMU (Q35 + ICH9, 2009), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebu4 [ 301.559569] RIP: 0010:untrack_pfn+0xf4/0x100 [ 301.559893] C\u00f3digo: 75 c4 eb cf 48 8b 43 10 8b a8 e8 00 00 00 3b b 28 74 b8 48 8b 7b 30 e8 ea 1a f7 000 [ 301.561189] RSP: 0018:ffffba2c0377fab8 EFLAGS: 00010282 [ 301.561590] RAX: 00000000ffffffea RBX: ffff9208c8ce9cc0 RCX: 455e047 [301.562105] RDX: 07fffffff0eb1e0a RSI: 0000000000000000 RDI: ffff9208c391d200 [301.562628] RBP: 0000000000000000 R08: 8 R09: 0000000000000000 [ 301.563145] R10: ffff9208d2292d50 R11: 0000000000000002 R12: 00007fea890e0000 [ 301.563669] R13: 00000 R14: ffffba2c0377fc08 R15: 00000000000000000 [ 301.564186] FS: 0000000000000000(0000) GS:ffff920c2fbc0000(0000) knlGS:0000000000000000 0 [301.564773] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 301.565197] CR2: 00007fea88ee8a20 CR3: 00000001033a8000 CR4: 0000000000750ef0 [ 301.565725] KRU: 55555554 [ 301.565944] Seguimiento de llamadas: [ 301.566148]  [ 301.566325] ? untrack_pfn+0xf4/0x100 [301.566618]? __advertir+0x81/0x130 [ 301.566876] ? untrack_pfn+0xf4/0x100 [ 3 ---truncado---\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/04c35ab3bdae7fefbd7c7a7355f29fa03a035221\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/09e6bb53217bf388a0d2fd7fb21e74ab9dffc173\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/1341e4b32e1fb1b0acd002ccd56f07bd32f2abc6\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/51b7841f3fe84606ec0bd8da859d22e05e5419ec\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/7cfee26d1950250b14c5cb0a37b142f3fcc6396a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/97e93367e82752e475a33839a80b33bdbef1209f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/c2b2430b48f3c9eaccd2c3d2ad75bb540d4952f4\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/f18681daaec9665a15c5e7e0f591aad5d0ac622b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://lists.debian.org/debian-lts-announce/2024/06/msg00017.html\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://lists.debian.org/debian-lts-announce/2024/06/msg00020.html\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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