cve-2024-47716
Vulnerability from cvelistv5
Published
2024-10-21 11:53
Modified
2024-12-19 09:26
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: ARM: 9410/1: vfp: Use asm volatile in fmrx/fmxr macros Floating point instructions in userspace can crash some arm kernels built with clang/LLD 17.0.6: BUG: unsupported FP instruction in kernel mode FPEXC == 0xc0000780 Internal error: Oops - undefined instruction: 0 [#1] ARM CPU: 0 PID: 196 Comm: vfp-reproducer Not tainted 6.10.0 #1 Hardware name: BCM2835 PC is at vfp_support_entry+0xc8/0x2cc LR is at do_undefinstr+0xa8/0x250 pc : [<c0101d50>] lr : [<c010a80c>] psr: a0000013 sp : dc8d1f68 ip : 60000013 fp : bedea19c r10: ec532b17 r9 : 00000010 r8 : 0044766c r7 : c0000780 r6 : ec532b17 r5 : c1c13800 r4 : dc8d1fb0 r3 : c10072c4 r2 : c0101c88 r1 : ec532b17 r0 : 0044766c Flags: NzCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none Control: 00c5387d Table: 0251c008 DAC: 00000051 Register r0 information: non-paged memory Register r1 information: vmalloc memory Register r2 information: non-slab/vmalloc memory Register r3 information: non-slab/vmalloc memory Register r4 information: 2-page vmalloc region Register r5 information: slab kmalloc-cg-2k Register r6 information: vmalloc memory Register r7 information: non-slab/vmalloc memory Register r8 information: non-paged memory Register r9 information: zero-size pointer Register r10 information: vmalloc memory Register r11 information: non-paged memory Register r12 information: non-paged memory Process vfp-reproducer (pid: 196, stack limit = 0x61aaaf8b) Stack: (0xdc8d1f68 to 0xdc8d2000) 1f60: 0000081f b6f69300 0000000f c10073f4 c10072c4 dc8d1fb0 1f80: ec532b17 0c532b17 0044766c b6f9ccd8 00000000 c010a80c 00447670 60000010 1fa0: ffffffff c1c13800 00c5387d c0100f10 b6f68af8 00448fc0 00000000 bedea188 1fc0: bedea314 00000001 00448ebc b6f9d000 00447608 b6f9ccd8 00000000 bedea19c 1fe0: bede9198 bedea188 b6e1061c 0044766c 60000010 ffffffff 00000000 00000000 Call trace: [<c0101d50>] (vfp_support_entry) from [<c010a80c>] (do_undefinstr+0xa8/0x250) [<c010a80c>] (do_undefinstr) from [<c0100f10>] (__und_usr+0x70/0x80) Exception stack(0xdc8d1fb0 to 0xdc8d1ff8) 1fa0: b6f68af8 00448fc0 00000000 bedea188 1fc0: bedea314 00000001 00448ebc b6f9d000 00447608 b6f9ccd8 00000000 bedea19c 1fe0: bede9198 bedea188 b6e1061c 0044766c 60000010 ffffffff Code: 0a000061 e3877202 e594003c e3a09010 (eef16a10) ---[ end trace 0000000000000000 ]--- Kernel panic - not syncing: Fatal exception in interrupt ---[ end Kernel panic - not syncing: Fatal exception in interrupt ]--- This is a minimal userspace reproducer on a Raspberry Pi Zero W: #include <stdio.h> #include <math.h> int main(void) { double v = 1.0; printf("%fn", NAN + *(volatile double *)&v); return 0; } Another way to consistently trigger the oops is: calvin@raspberry-pi-zero-w ~$ python -c "import json" The bug reproduces only when the kernel is built with DYNAMIC_DEBUG=n, because the pr_debug() calls act as barriers even when not activated. This is the output from the same kernel source built with the same compiler and DYNAMIC_DEBUG=y, where the userspace reproducer works as expected: VFP: bounce: trigger ec532b17 fpexc c0000780 VFP: emulate: INST=0xee377b06 SCR=0x00000000 VFP: bounce: trigger eef1fa10 fpexc c0000780 VFP: emulate: INST=0xeeb40b40 SCR=0x00000000 VFP: raising exceptions 30000000 calvin@raspberry-pi-zero-w ~$ ./vfp-reproducer nan Crudely grepping for vmsr/vmrs instructions in the otherwise nearly idential text for vfp_support_entry() makes the problem obvious: vmlinux.llvm.good [0xc0101cb8] <+48>: vmrs r7, fpexc vmlinux.llvm.good [0xc0101cd8] <+80>: vmsr fpexc, r0 vmlinux.llvm.good [0xc0101d20 ---truncated---
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/39caf610a63786b3b0ef3348ac015edc19827d6aPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/89a906dfa8c3b21b3e5360f73c49234ac1eb885bPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/9fc60f2bdd43e758bdf0305c0fc83221419ddb3fPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/cd595d87e5fdd2fc09ea69359aa85e7f12f4b97bPatch
Impacted products
Vendor Product Version
Linux Linux Version: 4708fb041346fa9cc6745dafb8c248a3e2f1075b
Version: 4708fb041346fa9cc6745dafb8c248a3e2f1075b
Version: 4708fb041346fa9cc6745dafb8c248a3e2f1075b
Version: 4708fb041346fa9cc6745dafb8c248a3e2f1075b
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   Linux Linux Version: 6.6
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{
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            "other": {
              "content": {
                "id": "CVE-2024-47716",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2024-10-21T13:02:37.747830Z",
                "version": "2.0.3"
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        "providerMetadata": {
          "dateUpdated": "2024-10-21T13:04:18.288Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
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        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "arch/arm/vfp/vfpinstr.h"
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          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "versionType": "git"
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          "product": "Linux",
          "programFiles": [
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          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.6"
            },
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              "lessThan": "6.6",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
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            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.54",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.10.*",
              "status": "unaffected",
              "version": "6.10.13",
              "versionType": "semver"
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              "lessThanOrEqual": "6.11.*",
              "status": "unaffected",
              "version": "6.11.2",
              "versionType": "semver"
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              "status": "unaffected",
              "version": "6.12",
              "versionType": "original_commit_for_fix"
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nARM: 9410/1: vfp: Use asm volatile in fmrx/fmxr macros\n\nFloating point instructions in userspace can crash some arm kernels\nbuilt with clang/LLD 17.0.6:\n\n    BUG: unsupported FP instruction in kernel mode\n    FPEXC == 0xc0000780\n    Internal error: Oops - undefined instruction: 0 [#1] ARM\n    CPU: 0 PID: 196 Comm: vfp-reproducer Not tainted 6.10.0 #1\n    Hardware name: BCM2835\n    PC is at vfp_support_entry+0xc8/0x2cc\n    LR is at do_undefinstr+0xa8/0x250\n    pc : [\u003cc0101d50\u003e]    lr : [\u003cc010a80c\u003e]    psr: a0000013\n    sp : dc8d1f68  ip : 60000013  fp : bedea19c\n    r10: ec532b17  r9 : 00000010  r8 : 0044766c\n    r7 : c0000780  r6 : ec532b17  r5 : c1c13800  r4 : dc8d1fb0\n    r3 : c10072c4  r2 : c0101c88  r1 : ec532b17  r0 : 0044766c\n    Flags: NzCv  IRQs on  FIQs on  Mode SVC_32  ISA ARM  Segment none\n    Control: 00c5387d  Table: 0251c008  DAC: 00000051\n    Register r0 information: non-paged memory\n    Register r1 information: vmalloc memory\n    Register r2 information: non-slab/vmalloc memory\n    Register r3 information: non-slab/vmalloc memory\n    Register r4 information: 2-page vmalloc region\n    Register r5 information: slab kmalloc-cg-2k\n    Register r6 information: vmalloc memory\n    Register r7 information: non-slab/vmalloc memory\n    Register r8 information: non-paged memory\n    Register r9 information: zero-size pointer\n    Register r10 information: vmalloc memory\n    Register r11 information: non-paged memory\n    Register r12 information: non-paged memory\n    Process vfp-reproducer (pid: 196, stack limit = 0x61aaaf8b)\n    Stack: (0xdc8d1f68 to 0xdc8d2000)\n    1f60:                   0000081f b6f69300 0000000f c10073f4 c10072c4 dc8d1fb0\n    1f80: ec532b17 0c532b17 0044766c b6f9ccd8 00000000 c010a80c 00447670 60000010\n    1fa0: ffffffff c1c13800 00c5387d c0100f10 b6f68af8 00448fc0 00000000 bedea188\n    1fc0: bedea314 00000001 00448ebc b6f9d000 00447608 b6f9ccd8 00000000 bedea19c\n    1fe0: bede9198 bedea188 b6e1061c 0044766c 60000010 ffffffff 00000000 00000000\n    Call trace:\n    [\u003cc0101d50\u003e] (vfp_support_entry) from [\u003cc010a80c\u003e] (do_undefinstr+0xa8/0x250)\n    [\u003cc010a80c\u003e] (do_undefinstr) from [\u003cc0100f10\u003e] (__und_usr+0x70/0x80)\n    Exception stack(0xdc8d1fb0 to 0xdc8d1ff8)\n    1fa0:                                     b6f68af8 00448fc0 00000000 bedea188\n    1fc0: bedea314 00000001 00448ebc b6f9d000 00447608 b6f9ccd8 00000000 bedea19c\n    1fe0: bede9198 bedea188 b6e1061c 0044766c 60000010 ffffffff\n    Code: 0a000061 e3877202 e594003c e3a09010 (eef16a10)\n    ---[ end trace 0000000000000000 ]---\n    Kernel panic - not syncing: Fatal exception in interrupt\n    ---[ end Kernel panic - not syncing: Fatal exception in interrupt ]---\n\nThis is a minimal userspace reproducer on a Raspberry Pi Zero W:\n\n    #include \u003cstdio.h\u003e\n    #include \u003cmath.h\u003e\n\n    int main(void)\n    {\n            double v = 1.0;\n            printf(\"%fn\", NAN + *(volatile double *)\u0026v);\n            return 0;\n    }\n\nAnother way to consistently trigger the oops is:\n\n    calvin@raspberry-pi-zero-w ~$ python -c \"import json\"\n\nThe bug reproduces only when the kernel is built with DYNAMIC_DEBUG=n,\nbecause the pr_debug() calls act as barriers even when not activated.\n\nThis is the output from the same kernel source built with the same\ncompiler and DYNAMIC_DEBUG=y, where the userspace reproducer works as\nexpected:\n\n    VFP: bounce: trigger ec532b17 fpexc c0000780\n    VFP: emulate: INST=0xee377b06 SCR=0x00000000\n    VFP: bounce: trigger eef1fa10 fpexc c0000780\n    VFP: emulate: INST=0xeeb40b40 SCR=0x00000000\n    VFP: raising exceptions 30000000\n\n    calvin@raspberry-pi-zero-w ~$ ./vfp-reproducer\n    nan\n\nCrudely grepping for vmsr/vmrs instructions in the otherwise nearly\nidential text for vfp_support_entry() makes the problem obvious:\n\n    vmlinux.llvm.good [0xc0101cb8] \u003c+48\u003e:  vmrs   r7, fpexc\n    vmlinux.llvm.good [0xc0101cd8] \u003c+80\u003e:  vmsr   fpexc, r0\n    vmlinux.llvm.good [0xc0101d20\n---truncated---"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2024-12-19T09:26:41.821Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/9fc60f2bdd43e758bdf0305c0fc83221419ddb3f"
        },
        {
          "url": "https://git.kernel.org/stable/c/cd595d87e5fdd2fc09ea69359aa85e7f12f4b97b"
        },
        {
          "url": "https://git.kernel.org/stable/c/39caf610a63786b3b0ef3348ac015edc19827d6a"
        },
        {
          "url": "https://git.kernel.org/stable/c/89a906dfa8c3b21b3e5360f73c49234ac1eb885b"
        }
      ],
      "title": "ARM: 9410/1: vfp: Use asm volatile in fmrx/fmxr macros",
      "x_generator": {
        "engine": "bippy-5f407fcff5a0"
      }
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  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2024-47716",
    "datePublished": "2024-10-21T11:53:47.434Z",
    "dateReserved": "2024-09-30T16:00:12.949Z",
    "dateUpdated": "2024-12-19T09:26:41.821Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2024-47716\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-10-21T12:15:07.943\",\"lastModified\":\"2024-10-24T14:34:17.863\",\"vulnStatus\":\"Analyzed\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nARM: 9410/1: vfp: Use asm volatile in fmrx/fmxr macros\\n\\nFloating point instructions in userspace can crash some arm kernels\\nbuilt with clang/LLD 17.0.6:\\n\\n    BUG: unsupported FP instruction in kernel mode\\n    FPEXC == 0xc0000780\\n    Internal error: Oops - undefined instruction: 0 [#1] ARM\\n    CPU: 0 PID: 196 Comm: vfp-reproducer Not tainted 6.10.0 #1\\n    Hardware name: BCM2835\\n    PC is at vfp_support_entry+0xc8/0x2cc\\n    LR is at do_undefinstr+0xa8/0x250\\n    pc : [\u003cc0101d50\u003e]    lr : [\u003cc010a80c\u003e]    psr: a0000013\\n    sp : dc8d1f68  ip : 60000013  fp : bedea19c\\n    r10: ec532b17  r9 : 00000010  r8 : 0044766c\\n    r7 : c0000780  r6 : ec532b17  r5 : c1c13800  r4 : dc8d1fb0\\n    r3 : c10072c4  r2 : c0101c88  r1 : ec532b17  r0 : 0044766c\\n    Flags: NzCv  IRQs on  FIQs on  Mode SVC_32  ISA ARM  Segment none\\n    Control: 00c5387d  Table: 0251c008  DAC: 00000051\\n    Register r0 information: non-paged memory\\n    Register r1 information: vmalloc memory\\n    Register r2 information: non-slab/vmalloc memory\\n    Register r3 information: non-slab/vmalloc memory\\n    Register r4 information: 2-page vmalloc region\\n    Register r5 information: slab kmalloc-cg-2k\\n    Register r6 information: vmalloc memory\\n    Register r7 information: non-slab/vmalloc memory\\n    Register r8 information: non-paged memory\\n    Register r9 information: zero-size pointer\\n    Register r10 information: vmalloc memory\\n    Register r11 information: non-paged memory\\n    Register r12 information: non-paged memory\\n    Process vfp-reproducer (pid: 196, stack limit = 0x61aaaf8b)\\n    Stack: (0xdc8d1f68 to 0xdc8d2000)\\n    1f60:                   0000081f b6f69300 0000000f c10073f4 c10072c4 dc8d1fb0\\n    1f80: ec532b17 0c532b17 0044766c b6f9ccd8 00000000 c010a80c 00447670 60000010\\n    1fa0: ffffffff c1c13800 00c5387d c0100f10 b6f68af8 00448fc0 00000000 bedea188\\n    1fc0: bedea314 00000001 00448ebc b6f9d000 00447608 b6f9ccd8 00000000 bedea19c\\n    1fe0: bede9198 bedea188 b6e1061c 0044766c 60000010 ffffffff 00000000 00000000\\n    Call trace:\\n    [\u003cc0101d50\u003e] (vfp_support_entry) from [\u003cc010a80c\u003e] (do_undefinstr+0xa8/0x250)\\n    [\u003cc010a80c\u003e] (do_undefinstr) from [\u003cc0100f10\u003e] (__und_usr+0x70/0x80)\\n    Exception stack(0xdc8d1fb0 to 0xdc8d1ff8)\\n    1fa0:                                     b6f68af8 00448fc0 00000000 bedea188\\n    1fc0: bedea314 00000001 00448ebc b6f9d000 00447608 b6f9ccd8 00000000 bedea19c\\n    1fe0: bede9198 bedea188 b6e1061c 0044766c 60000010 ffffffff\\n    Code: 0a000061 e3877202 e594003c e3a09010 (eef16a10)\\n    ---[ end trace 0000000000000000 ]---\\n    Kernel panic - not syncing: Fatal exception in interrupt\\n    ---[ end Kernel panic - not syncing: Fatal exception in interrupt ]---\\n\\nThis is a minimal userspace reproducer on a Raspberry Pi Zero W:\\n\\n    #include \u003cstdio.h\u003e\\n    #include \u003cmath.h\u003e\\n\\n    int main(void)\\n    {\\n            double v = 1.0;\\n            printf(\\\"%fn\\\", NAN + *(volatile double *)\u0026v);\\n            return 0;\\n    }\\n\\nAnother way to consistently trigger the oops is:\\n\\n    calvin@raspberry-pi-zero-w ~$ python -c \\\"import json\\\"\\n\\nThe bug reproduces only when the kernel is built with DYNAMIC_DEBUG=n,\\nbecause the pr_debug() calls act as barriers even when not activated.\\n\\nThis is the output from the same kernel source built with the same\\ncompiler and DYNAMIC_DEBUG=y, where the userspace reproducer works as\\nexpected:\\n\\n    VFP: bounce: trigger ec532b17 fpexc c0000780\\n    VFP: emulate: INST=0xee377b06 SCR=0x00000000\\n    VFP: bounce: trigger eef1fa10 fpexc c0000780\\n    VFP: emulate: INST=0xeeb40b40 SCR=0x00000000\\n    VFP: raising exceptions 30000000\\n\\n    calvin@raspberry-pi-zero-w ~$ ./vfp-reproducer\\n    nan\\n\\nCrudely grepping for vmsr/vmrs instructions in the otherwise nearly\\nidential text for vfp_support_entry() makes the problem obvious:\\n\\n    vmlinux.llvm.good [0xc0101cb8] \u003c+48\u003e:  vmrs   r7, fpexc\\n    vmlinux.llvm.good [0xc0101cd8] \u003c+80\u003e:  vmsr   fpexc, r0\\n    vmlinux.llvm.good [0xc0101d20\\n---truncated---\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: ARM: 9410/1: vfp: usar asm vol\u00e1til en macros fmrx/fmxr Las instrucciones de punto flotante en el espacio de usuario pueden bloquear algunos kernels de ARM creados con clang/LLD 17.0.6: ERROR: instrucci\u00f3n FP no compatible en modo kernel FPEXC == 0xc0000780 Error interno: Ups - instrucci\u00f3n no definida: 0 [#1] CPU ARM: 0 PID: 196 Comm: vfp-reproducer No contaminado 6.10.0 #1 Nombre del hardware: BCM2835 La PC est\u00e1 en vfp_support_entry+0xc8/0x2cc LR est\u00e1 en do_undefinstr+0xa8/0x250 pc : [] lr : [] psr: a0000013 sp : dc8d1f68 ip : 60000013 fp : bedea19c r10: ec532b17 r9 : 00000010 r8 : 0044766c r7 : c0000780 r6 : ec532b17 r5 : c1c13800 r4 : dc8d1fb0 r3 : c10072c4 r2 : c0101c88 r1 : ec532b17 r0 : 0044766c Indicadores: NzCv IRQ en FIQ en modo SVC_32 ISA ARM Segmento ninguno Control: 00c5387d Tabla: 0251c008 DAC: 00000051 Informaci\u00f3n del registro r0: Informaci\u00f3n del registro r1: memoria vmalloc Informaci\u00f3n del registro r2: memoria no slab/vmalloc Informaci\u00f3n del registro r3: memoria no slab/vmalloc Informaci\u00f3n del registro r4: regi\u00f3n vmalloc de 2 p\u00e1ginas Informaci\u00f3n del registro r5: slab kmalloc-cg-2k Informaci\u00f3n del registro r6: memoria vmalloc Informaci\u00f3n del registro r7: memoria no slab/vmalloc Informaci\u00f3n del registro r8: memoria no paginada Informaci\u00f3n del registro r9: puntero de tama\u00f1o cero Informaci\u00f3n del registro r10: memoria vmalloc Informaci\u00f3n del registro r11: memoria no paginada Informaci\u00f3n del registro r12: memoria no paginada Proceso vfp-reproducer (pid: 196, l\u00edmite de pila = 0x61aaaf8b) Pila: (0xdc8d1f68 a 0xdc8d2000) 1f60: 0000081f b6f69300 0000000f c10073f4 c10072c4 dc8d1fb0 1f80: ec532b17 0c532b17 0044766c b6f9ccd8 00000000 c010a80c 00447670 60000010 1fa0: ffffffff c1c13800 7d c0100f10 b6f68af8 00448fc0 00000000 bedea188 1fc0: bedea314 00000001 00448ebc b6f9d000 00447608 b6f9ccd8 00000000 bedea19c 1fe0: bede9198 bedea188 b6e1061c 0044766c 60000010 ffffffff 00000000 00000000 Seguimiento de llamadas: [] (vfp_support_entry) desde [] (do_undefinstr+0xa8/0x250) [] (do_undefinstr) desde [] (__und_usr+0x70/0x80) Pila de excepciones (0xdc8d1fb0 a 0xdc8d1ff8) 1fa0: b6f68af8 00448fc0 00000000 bedea188 1fc0: bedea314 00000001 00448ebc b6f9d000 00447608 b6f9ccd8 00000000 bedea19c 1fe0: bede9198 bedea188 b6e1061c 0044766c 60000010 ffffffff C\u00f3digo: 0a000061 e3877202 e594003c e3a09010 (eef16a10) ---[ fin del seguimiento 000000000000000 ]--- P\u00e1nico del kernel: no sincroniza: Excepci\u00f3n fatal en la interrupci\u00f3n ---[ fin del kernel: no sincroniza: Excepci\u00f3n fatal en la interrupci\u00f3n ]--- Este es un reproductor de espacio de usuario m\u00ednimo en una Raspberry Pi Zero W: #include  #include  int main(void) { double v = 1.0; printf(\\\"%fn\\\", NAN + *(volatile double *)\u0026amp;v); return 0; } Otra forma de activar consistentemente el error es: calvin@raspberry-pi-zero-w ~$ python -c \\\"import json\\\" El error se reproduce solo cuando el kernel se construye con DYNAMIC_DEBUG=n, porque las llamadas pr_debug() act\u00faan como barreras incluso cuando no est\u00e1n activadas. Esta es la salida de la misma fuente del kernel creada con el mismo compilador y DYNAMIC_DEBUG=y, donde el reproductor de espacio de usuario funciona como se espera: VFP: bounce: trigger ec532b17 fpexc c0000780 VFP: emulate: INST=0xee377b06 SCR=0x00000000 VFP: bounce: trigger eef1fa10 fpexc c0000780 VFP: emulate: INST=0xeeb40b40 SCR=0x00000000 VFP: raising exceptions 30000000 calvin@raspberry-pi-zero-w ~$ ./vfp-reproducer nan Buscar burdamente instrucciones vmsr/vmrs en el texto casi id\u00e9ntico de vfp_support_entry() hace que el problema sea obvio: vmlinux.llvm.good [0xc0101cb8] \u0026lt;+48\u0026gt;: vmrs r7, fpexc vmlinux.llvm.good [0xc0101cd8] \u0026lt;+80\u0026gt;: vmsr fpexc, r0 vmlinux.llvm.good [0xc0101d20 ---truncado---\"}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"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}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"NVD-CWE-noinfo\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.6\",\"versionEndExcluding\":\"6.6.54\",\"matchCriteriaId\":\"E729C51E-0317-4ABD-B95D-E6F8D80A17F6\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.7\",\"versionEndExcluding\":\"6.10.13\",\"matchCriteriaId\":\"CE94BB8D-B0AB-4563-9ED7-A12122B56EBE\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.11\",\"versionEndExcluding\":\"6.11.2\",\"matchCriteriaId\":\"AB755D26-97F4-43B6-8604-CD076811E181\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/39caf610a63786b3b0ef3348ac015edc19827d6a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/89a906dfa8c3b21b3e5360f73c49234ac1eb885b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/9fc60f2bdd43e758bdf0305c0fc83221419ddb3f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/cd595d87e5fdd2fc09ea69359aa85e7f12f4b97b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]}]}}",
    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2024-47716\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2024-10-21T13:02:37.747830Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2024-10-21T13:02:40.761Z\"}}], \"cna\": {\"title\": \"ARM: 9410/1: vfp: Use asm volatile in fmrx/fmxr macros\", \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"4708fb041346fa9cc6745dafb8c248a3e2f1075b\", \"lessThan\": \"9fc60f2bdd43e758bdf0305c0fc83221419ddb3f\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"4708fb041346fa9cc6745dafb8c248a3e2f1075b\", \"lessThan\": \"cd595d87e5fdd2fc09ea69359aa85e7f12f4b97b\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"4708fb041346fa9cc6745dafb8c248a3e2f1075b\", \"lessThan\": \"39caf610a63786b3b0ef3348ac015edc19827d6a\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"4708fb041346fa9cc6745dafb8c248a3e2f1075b\", \"lessThan\": \"89a906dfa8c3b21b3e5360f73c49234ac1eb885b\", \"versionType\": \"git\"}], \"programFiles\": [\"arch/arm/vfp/vfpinstr.h\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"6.6\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"6.6\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"6.6.54\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.6.*\"}, {\"status\": \"unaffected\", \"version\": \"6.10.13\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.10.*\"}, {\"status\": \"unaffected\", \"version\": \"6.11.2\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.11.*\"}, {\"status\": \"unaffected\", \"version\": \"6.12\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"arch/arm/vfp/vfpinstr.h\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/9fc60f2bdd43e758bdf0305c0fc83221419ddb3f\"}, {\"url\": \"https://git.kernel.org/stable/c/cd595d87e5fdd2fc09ea69359aa85e7f12f4b97b\"}, {\"url\": \"https://git.kernel.org/stable/c/39caf610a63786b3b0ef3348ac015edc19827d6a\"}, {\"url\": \"https://git.kernel.org/stable/c/89a906dfa8c3b21b3e5360f73c49234ac1eb885b\"}], \"x_generator\": {\"engine\": \"bippy-5f407fcff5a0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nARM: 9410/1: vfp: Use asm volatile in fmrx/fmxr macros\\n\\nFloating point instructions in userspace can crash some arm kernels\\nbuilt with clang/LLD 17.0.6:\\n\\n    BUG: unsupported FP instruction in kernel mode\\n    FPEXC == 0xc0000780\\n    Internal error: Oops - undefined instruction: 0 [#1] ARM\\n    CPU: 0 PID: 196 Comm: vfp-reproducer Not tainted 6.10.0 #1\\n    Hardware name: BCM2835\\n    PC is at vfp_support_entry+0xc8/0x2cc\\n    LR is at do_undefinstr+0xa8/0x250\\n    pc : [\u003cc0101d50\u003e]    lr : [\u003cc010a80c\u003e]    psr: a0000013\\n    sp : dc8d1f68  ip : 60000013  fp : bedea19c\\n    r10: ec532b17  r9 : 00000010  r8 : 0044766c\\n    r7 : c0000780  r6 : ec532b17  r5 : c1c13800  r4 : dc8d1fb0\\n    r3 : c10072c4  r2 : c0101c88  r1 : ec532b17  r0 : 0044766c\\n    Flags: NzCv  IRQs on  FIQs on  Mode SVC_32  ISA ARM  Segment none\\n    Control: 00c5387d  Table: 0251c008  DAC: 00000051\\n    Register r0 information: non-paged memory\\n    Register r1 information: vmalloc memory\\n    Register r2 information: non-slab/vmalloc memory\\n    Register r3 information: non-slab/vmalloc memory\\n    Register r4 information: 2-page vmalloc region\\n    Register r5 information: slab kmalloc-cg-2k\\n    Register r6 information: vmalloc memory\\n    Register r7 information: non-slab/vmalloc memory\\n    Register r8 information: non-paged memory\\n    Register r9 information: zero-size pointer\\n    Register r10 information: vmalloc memory\\n    Register r11 information: non-paged memory\\n    Register r12 information: non-paged memory\\n    Process vfp-reproducer (pid: 196, stack limit = 0x61aaaf8b)\\n    Stack: (0xdc8d1f68 to 0xdc8d2000)\\n    1f60:                   0000081f b6f69300 0000000f c10073f4 c10072c4 dc8d1fb0\\n    1f80: ec532b17 0c532b17 0044766c b6f9ccd8 00000000 c010a80c 00447670 60000010\\n    1fa0: ffffffff c1c13800 00c5387d c0100f10 b6f68af8 00448fc0 00000000 bedea188\\n    1fc0: bedea314 00000001 00448ebc b6f9d000 00447608 b6f9ccd8 00000000 bedea19c\\n    1fe0: bede9198 bedea188 b6e1061c 0044766c 60000010 ffffffff 00000000 00000000\\n    Call trace:\\n    [\u003cc0101d50\u003e] (vfp_support_entry) from [\u003cc010a80c\u003e] (do_undefinstr+0xa8/0x250)\\n    [\u003cc010a80c\u003e] (do_undefinstr) from [\u003cc0100f10\u003e] (__und_usr+0x70/0x80)\\n    Exception stack(0xdc8d1fb0 to 0xdc8d1ff8)\\n    1fa0:                                     b6f68af8 00448fc0 00000000 bedea188\\n    1fc0: bedea314 00000001 00448ebc b6f9d000 00447608 b6f9ccd8 00000000 bedea19c\\n    1fe0: bede9198 bedea188 b6e1061c 0044766c 60000010 ffffffff\\n    Code: 0a000061 e3877202 e594003c e3a09010 (eef16a10)\\n    ---[ end trace 0000000000000000 ]---\\n    Kernel panic - not syncing: Fatal exception in interrupt\\n    ---[ end Kernel panic - not syncing: Fatal exception in interrupt ]---\\n\\nThis is a minimal userspace reproducer on a Raspberry Pi Zero W:\\n\\n    #include \u003cstdio.h\u003e\\n    #include \u003cmath.h\u003e\\n\\n    int main(void)\\n    {\\n            double v = 1.0;\\n            printf(\\\"%fn\\\", NAN + *(volatile double *)\u0026v);\\n            return 0;\\n    }\\n\\nAnother way to consistently trigger the oops is:\\n\\n    calvin@raspberry-pi-zero-w ~$ python -c \\\"import json\\\"\\n\\nThe bug reproduces only when the kernel is built with DYNAMIC_DEBUG=n,\\nbecause the pr_debug() calls act as barriers even when not activated.\\n\\nThis is the output from the same kernel source built with the same\\ncompiler and DYNAMIC_DEBUG=y, where the userspace reproducer works as\\nexpected:\\n\\n    VFP: bounce: trigger ec532b17 fpexc c0000780\\n    VFP: emulate: INST=0xee377b06 SCR=0x00000000\\n    VFP: bounce: trigger eef1fa10 fpexc c0000780\\n    VFP: emulate: INST=0xeeb40b40 SCR=0x00000000\\n    VFP: raising exceptions 30000000\\n\\n    calvin@raspberry-pi-zero-w ~$ ./vfp-reproducer\\n    nan\\n\\nCrudely grepping for vmsr/vmrs instructions in the otherwise nearly\\nidential text for vfp_support_entry() makes the problem obvious:\\n\\n    vmlinux.llvm.good [0xc0101cb8] \u003c+48\u003e:  vmrs   r7, fpexc\\n    vmlinux.llvm.good [0xc0101cd8] \u003c+80\u003e:  vmsr   fpexc, r0\\n    vmlinux.llvm.good [0xc0101d20\\n---truncated---\"}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2024-12-19T09:26:41.821Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2024-47716\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2024-12-19T09:26:41.821Z\", \"dateReserved\": \"2024-09-30T16:00:12.949Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-10-21T11:53:47.434Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}


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