cve-2021-47414
Vulnerability from cvelistv5
Published
2024-05-21 15:04
Modified
2024-11-04 12:05
Severity ?
Summary
riscv: Flush current cpu icache before other cpus
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/427faa29e06f0709476ea1bd59758f997ec8b64e
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/bb8958d5dc79acbd071397abb57b8756375fe1ce
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/f1c7aa87c423e765e3862349c2f095fdfccdd9b3
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/427faa29e06f0709476ea1bd59758f997ec8b64e
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/bb8958d5dc79acbd071397abb57b8756375fe1ce
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/f1c7aa87c423e765e3862349c2f095fdfccdd9b3
Impacted products
Vendor Product Version
Linux Linux Version: 4.15
Show details on NVD website

To clipboard 

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                "id": "CVE-2021-47414",
                "options": [
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                    "Exploitation": "none"
                  },
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                    "Automatable": "no"
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                  {
                    "Technical Impact": "partial"
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                "role": "CISA Coordinator",
                "timestamp": "2024-05-23T17:52:58.625321Z",
                "version": "2.0.3"
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          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
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        "title": "CISA ADP Vulnrichment"
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        "providerMetadata": {
          "dateUpdated": "2024-08-04T05:39:59.118Z",
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            "url": "https://git.kernel.org/stable/c/bb8958d5dc79acbd071397abb57b8756375fe1ce"
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        "title": "CVE Program Container"
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    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "arch/riscv/mm/cacheflush.c"
          ],
          "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": [
            "arch/riscv/mm/cacheflush.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.15"
            },
            {
              "lessThan": "4.15",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.73",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.14.*",
              "status": "unaffected",
              "version": "5.14.12",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "5.15",
              "versionType": "original_commit_for_fix"
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nriscv: Flush current cpu icache before other cpus\n\nOn SiFive Unmatched, I recently fell onto the following BUG when booting:\n\n[    0.000000] ftrace: allocating 36610 entries in 144 pages\n[    0.000000] Oops - illegal instruction [#1]\n[    0.000000] Modules linked in:\n[    0.000000] CPU: 0 PID: 0 Comm: swapper Not tainted 5.13.1+ #5\n[    0.000000] Hardware name: SiFive HiFive Unmatched A00 (DT)\n[    0.000000] epc : riscv_cpuid_to_hartid_mask+0x6/0xae\n[    0.000000]  ra : __sbi_rfence_v02+0xc8/0x10a\n[    0.000000] epc : ffffffff80007240 ra : ffffffff80009964 sp : ffffffff81803e10\n[    0.000000]  gp : ffffffff81a1ea70 tp : ffffffff8180f500 t0 : ffffffe07fe30000\n[    0.000000]  t1 : 0000000000000004 t2 : 0000000000000000 s0 : ffffffff81803e60\n[    0.000000]  s1 : 0000000000000000 a0 : ffffffff81a22238 a1 : ffffffff81803e10\n[    0.000000]  a2 : 0000000000000000 a3 : 0000000000000000 a4 : 0000000000000000\n[    0.000000]  a5 : 0000000000000000 a6 : ffffffff8000989c a7 : 0000000052464e43\n[    0.000000]  s2 : ffffffff81a220c8 s3 : 0000000000000000 s4 : 0000000000000000\n[    0.000000]  s5 : 0000000000000000 s6 : 0000000200000100 s7 : 0000000000000001\n[    0.000000]  s8 : ffffffe07fe04040 s9 : ffffffff81a22c80 s10: 0000000000001000\n[    0.000000]  s11: 0000000000000004 t3 : 0000000000000001 t4 : 0000000000000008\n[    0.000000]  t5 : ffffffcf04000808 t6 : ffffffe3ffddf188\n[    0.000000] status: 0000000200000100 badaddr: 0000000000000000 cause: 0000000000000002\n[    0.000000] [\u003cffffffff80007240\u003e] riscv_cpuid_to_hartid_mask+0x6/0xae\n[    0.000000] [\u003cffffffff80009474\u003e] sbi_remote_fence_i+0x1e/0x26\n[    0.000000] [\u003cffffffff8000b8f4\u003e] flush_icache_all+0x12/0x1a\n[    0.000000] [\u003cffffffff8000666c\u003e] patch_text_nosync+0x26/0x32\n[    0.000000] [\u003cffffffff8000884e\u003e] ftrace_init_nop+0x52/0x8c\n[    0.000000] [\u003cffffffff800f051e\u003e] ftrace_process_locs.isra.0+0x29c/0x360\n[    0.000000] [\u003cffffffff80a0e3c6\u003e] ftrace_init+0x80/0x130\n[    0.000000] [\u003cffffffff80a00f8c\u003e] start_kernel+0x5c4/0x8f6\n[    0.000000] ---[ end trace f67eb9af4d8d492b ]---\n[    0.000000] Kernel panic - not syncing: Attempted to kill the idle task!\n[    0.000000] ---[ end Kernel panic - not syncing: Attempted to kill the idle task! ]---\n\nWhile ftrace is looping over a list of addresses to patch, it always failed\nwhen patching the same function: riscv_cpuid_to_hartid_mask. Looking at the\nbacktrace, the illegal instruction is encountered in this same function.\nHowever, patch_text_nosync, after patching the instructions, calls\nflush_icache_range. But looking at what happens in this function:\n\nflush_icache_range -\u003e flush_icache_all\n                   -\u003e sbi_remote_fence_i\n                   -\u003e __sbi_rfence_v02\n                   -\u003e riscv_cpuid_to_hartid_mask\n\nThe icache and dcache of the current cpu are never synchronized between the\npatching of riscv_cpuid_to_hartid_mask and calling this same function.\n\nSo fix this by flushing the current cpu\u0027s icache before asking for the other\ncpus to do the same."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2024-11-04T12:05:27.129Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
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          "url": "https://git.kernel.org/stable/c/427faa29e06f0709476ea1bd59758f997ec8b64e"
        },
        {
          "url": "https://git.kernel.org/stable/c/f1c7aa87c423e765e3862349c2f095fdfccdd9b3"
        },
        {
          "url": "https://git.kernel.org/stable/c/bb8958d5dc79acbd071397abb57b8756375fe1ce"
        }
      ],
      "title": "riscv: Flush current cpu icache before other cpus",
      "x_generator": {
        "engine": "bippy-9e1c9544281a"
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  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2021-47414",
    "datePublished": "2024-05-21T15:04:04.715Z",
    "dateReserved": "2024-05-21T14:58:30.818Z",
    "dateUpdated": "2024-11-04T12:05:27.129Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2021-47414\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-05-21T15:15:26.887\",\"lastModified\":\"2024-11-21T06:36:05.703\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nriscv: Flush current cpu icache before other cpus\\n\\nOn SiFive Unmatched, I recently fell onto the following BUG when booting:\\n\\n[    0.000000] ftrace: allocating 36610 entries in 144 pages\\n[    0.000000] Oops - illegal instruction [#1]\\n[    0.000000] Modules linked in:\\n[    0.000000] CPU: 0 PID: 0 Comm: swapper Not tainted 5.13.1+ #5\\n[    0.000000] Hardware name: SiFive HiFive Unmatched A00 (DT)\\n[    0.000000] epc : riscv_cpuid_to_hartid_mask+0x6/0xae\\n[    0.000000]  ra : __sbi_rfence_v02+0xc8/0x10a\\n[    0.000000] epc : ffffffff80007240 ra : ffffffff80009964 sp : ffffffff81803e10\\n[    0.000000]  gp : ffffffff81a1ea70 tp : ffffffff8180f500 t0 : ffffffe07fe30000\\n[    0.000000]  t1 : 0000000000000004 t2 : 0000000000000000 s0 : ffffffff81803e60\\n[    0.000000]  s1 : 0000000000000000 a0 : ffffffff81a22238 a1 : ffffffff81803e10\\n[    0.000000]  a2 : 0000000000000000 a3 : 0000000000000000 a4 : 0000000000000000\\n[    0.000000]  a5 : 0000000000000000 a6 : ffffffff8000989c a7 : 0000000052464e43\\n[    0.000000]  s2 : ffffffff81a220c8 s3 : 0000000000000000 s4 : 0000000000000000\\n[    0.000000]  s5 : 0000000000000000 s6 : 0000000200000100 s7 : 0000000000000001\\n[    0.000000]  s8 : ffffffe07fe04040 s9 : ffffffff81a22c80 s10: 0000000000001000\\n[    0.000000]  s11: 0000000000000004 t3 : 0000000000000001 t4 : 0000000000000008\\n[    0.000000]  t5 : ffffffcf04000808 t6 : ffffffe3ffddf188\\n[    0.000000] status: 0000000200000100 badaddr: 0000000000000000 cause: 0000000000000002\\n[    0.000000] [\u003cffffffff80007240\u003e] riscv_cpuid_to_hartid_mask+0x6/0xae\\n[    0.000000] [\u003cffffffff80009474\u003e] sbi_remote_fence_i+0x1e/0x26\\n[    0.000000] [\u003cffffffff8000b8f4\u003e] flush_icache_all+0x12/0x1a\\n[    0.000000] [\u003cffffffff8000666c\u003e] patch_text_nosync+0x26/0x32\\n[    0.000000] [\u003cffffffff8000884e\u003e] ftrace_init_nop+0x52/0x8c\\n[    0.000000] [\u003cffffffff800f051e\u003e] ftrace_process_locs.isra.0+0x29c/0x360\\n[    0.000000] [\u003cffffffff80a0e3c6\u003e] ftrace_init+0x80/0x130\\n[    0.000000] [\u003cffffffff80a00f8c\u003e] start_kernel+0x5c4/0x8f6\\n[    0.000000] ---[ end trace f67eb9af4d8d492b ]---\\n[    0.000000] Kernel panic - not syncing: Attempted to kill the idle task!\\n[    0.000000] ---[ end Kernel panic - not syncing: Attempted to kill the idle task! ]---\\n\\nWhile ftrace is looping over a list of addresses to patch, it always failed\\nwhen patching the same function: riscv_cpuid_to_hartid_mask. Looking at the\\nbacktrace, the illegal instruction is encountered in this same function.\\nHowever, patch_text_nosync, after patching the instructions, calls\\nflush_icache_range. But looking at what happens in this function:\\n\\nflush_icache_range -\u003e flush_icache_all\\n                   -\u003e sbi_remote_fence_i\\n                   -\u003e __sbi_rfence_v02\\n                   -\u003e riscv_cpuid_to_hartid_mask\\n\\nThe icache and dcache of the current cpu are never synchronized between the\\npatching of riscv_cpuid_to_hartid_mask and calling this same function.\\n\\nSo fix this by flushing the current cpu\u0027s icache before asking for the other\\ncpus to do the same.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: riscv: vaciar el icache de la CPU actual antes que otras CPU. En SiFive Unmatched, recientemente encontr\u00e9 el siguiente BUGal arrancar: [0.000000] ftrace: asignar 36610 entradas en 144 p\u00e1ginas [0.000000] Ups - instrucci\u00f3n ilegal [#1] [ 0.000000] M\u00f3dulos vinculados en: [ 0.000000] CPU: 0 PID: 0 Comm: swapper Not tainted 5.13.1+ #5 [ 0.000000] Nombre del hardware: SiFive HiFive Unmatched A00 (DT) [ 0.000000] epc: riscv_cpuid_to_hartid_mask+0x6/0xae [ 0.000000] ra : __sbi_rfence_v02+0xc8/0x10a [ 0.000000] epc : ffffffff80007240 ra : ffffffff80009964 sp : ffffffff81803e10 [ 0 .000000] gp : ffffffff81a1ea70 tp : ffffffff8180f500 t0 : ffffffe07fe30000 [ 0.000000] t1 : 00000000000000004 t2 : 00000000000000000 s0: ffffffff81803e60 [0.000000] s1: 0000000000000000 a0: ffffffff81a22238 a1: ffffffff81803e10 [0.000000] a2: 000000000000000 a3: 0000000 000000000 a4: 0000000000000000 [0.000000] a5: 0000000000000000 a6: ffffffff8000989c a7: 0000000052464e43 [0.000000] s2: ffffffff81a220c8 s3: 0000000000000000 s4: 0000000000000000 [ 0.000000] s5 : 0000000000000000 s6 : 0000000200000100 s7 : 0000000000000001 [ 0.000000] s8 : ffffffe07fe04040 s9 : ffffffff81a22c80 s10: 0000000000001000 [0.000000] s11: 0000000000000004 t3: 0000000000000001 t4: 0000000000000008 [0.000000] t5: ffcf04000808 t6: ffffffe3ffddf188 [0.000000] estado : 0000000200000100 badaddr: 0000000000000000 causa: 0000000000000002 [ 0.000000] [] riscv_cpuid_to_hartid_mask+0x6/0xae [ 0.000000] ffffffff80009474\u0026gt;] sbi_remote_fence_i+0x1e/0x26 [ 0.000000] [] Flush_icache_all+0x12/0x1a [ 0.000000] [] patch_text_nosync+0x26/0x32 [ 0.000000] [] ftrace_init_nop+0x52/0x8c [ 0.000000] [] ftrace_process_locs.isra.0+0x29c/ 0x360 [ 0.000000] [] ftrace_init+ 0x80/0x130 [ 0.000000] [] start_kernel+0x5c4/0x8f6 [ 0.000000] ---[ end trace f67eb9af4d8d492b ]--- [ 0.000000] P\u00e1nico en el kernel - no se sincroniza: \u00a1Intent\u00f3 finalizar la tarea inactiva! [0.000000] ---[ fin del p\u00e1nico del kernel: no se sincroniza: \u00a1se intent\u00f3 finalizar la tarea inactiva! ]--- Mientras ftrace recorre una lista de direcciones para parchear, siempre fallaba al parchear la misma funci\u00f3n: riscv_cpuid_to_hartid_mask. Al observar el seguimiento, la instrucci\u00f3n ilegal se encuentra en esta misma funci\u00f3n. Sin embargo, patch_text_nosync, despu\u00e9s de parchear las instrucciones, llama a flush_icache_range. Pero observando lo que sucede en esta funci\u00f3n: Flush_icache_range -\u0026gt; Flush_icache_all -\u0026gt; sbi_remote_fence_i -\u0026gt; __sbi_rfence_v02 -\u0026gt; riscv_cpuid_to_hartid_mask El icache y el dcache de la CPU actual nunca se sincronizan entre el parche de riscv_cpuid_to_hartid_mask y la llamada a esta misma funci\u00f3n. As\u00ed que solucione este problema limpiando el icache de la CPU actual antes de pedirle a las otras CPU que hagan lo mismo.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/427faa29e06f0709476ea1bd59758f997ec8b64e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/bb8958d5dc79acbd071397abb57b8756375fe1ce\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/f1c7aa87c423e765e3862349c2f095fdfccdd9b3\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/427faa29e06f0709476ea1bd59758f997ec8b64e\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://git.kernel.org/stable/c/bb8958d5dc79acbd071397abb57b8756375fe1ce\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://git.kernel.org/stable/c/f1c7aa87c423e765e3862349c2f095fdfccdd9b3\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"}]}}"
  }
}


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