cve-2021-47414
Vulnerability from cvelistv5
Published
2024-05-21 15:04
Modified
2024-12-19 07:41
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: riscv: Flush current cpu icache before other cpus On SiFive Unmatched, I recently fell onto the following BUG when booting: [ 0.000000] ftrace: allocating 36610 entries in 144 pages [ 0.000000] Oops - illegal instruction [#1] [ 0.000000] Modules linked in: [ 0.000000] CPU: 0 PID: 0 Comm: swapper Not tainted 5.13.1+ #5 [ 0.000000] Hardware name: 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 : 0000000000000004 t2 : 0000000000000000 s0 : ffffffff81803e60 [ 0.000000] s1 : 0000000000000000 a0 : ffffffff81a22238 a1 : ffffffff81803e10 [ 0.000000] a2 : 0000000000000000 a3 : 0000000000000000 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 : ffffffcf04000808 t6 : ffffffe3ffddf188 [ 0.000000] status: 0000000200000100 badaddr: 0000000000000000 cause: 0000000000000002 [ 0.000000] [<ffffffff80007240>] riscv_cpuid_to_hartid_mask+0x6/0xae [ 0.000000] [<ffffffff80009474>] sbi_remote_fence_i+0x1e/0x26 [ 0.000000] [<ffffffff8000b8f4>] flush_icache_all+0x12/0x1a [ 0.000000] [<ffffffff8000666c>] patch_text_nosync+0x26/0x32 [ 0.000000] [<ffffffff8000884e>] ftrace_init_nop+0x52/0x8c [ 0.000000] [<ffffffff800f051e>] ftrace_process_locs.isra.0+0x29c/0x360 [ 0.000000] [<ffffffff80a0e3c6>] ftrace_init+0x80/0x130 [ 0.000000] [<ffffffff80a00f8c>] start_kernel+0x5c4/0x8f6 [ 0.000000] ---[ end trace f67eb9af4d8d492b ]--- [ 0.000000] Kernel panic - not syncing: Attempted to kill the idle task! [ 0.000000] ---[ end Kernel panic - not syncing: Attempted to kill the idle task! ]--- While ftrace is looping over a list of addresses to patch, it always failed when patching the same function: riscv_cpuid_to_hartid_mask. Looking at the backtrace, the illegal instruction is encountered in this same function. However, patch_text_nosync, after patching the instructions, calls flush_icache_range. But looking at what happens in this function: flush_icache_range -> flush_icache_all -> sbi_remote_fence_i -> __sbi_rfence_v02 -> riscv_cpuid_to_hartid_mask The icache and dcache of the current cpu are never synchronized between the patching of riscv_cpuid_to_hartid_mask and calling this same function. So fix this by flushing the current cpu's icache before asking for the other cpus to do the same.
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: fab957c11efe2f405e08b9f0d080524bc2631428
Version: fab957c11efe2f405e08b9f0d080524bc2631428
Version: fab957c11efe2f405e08b9f0d080524bc2631428
 Create a notification for this product.
   Linux Linux Version: 4.15
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                "id": "CVE-2021-47414",
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                "timestamp": "2024-05-23T17:52:58.625321Z",
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          "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."
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      "title": "riscv: Flush current cpu icache before other cpus",
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  "cveMetadata": {
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    "cveId": "CVE-2021-47414",
    "datePublished": "2024-05-21T15:04:04.715Z",
    "dateReserved": "2024-05-21T14:58:30.818Z",
    "dateUpdated": "2024-12-19T07:41:31.810Z",
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    "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\"}]}}",
    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CVE Program Container\", \"references\": [{\"url\": \"https://git.kernel.org/stable/c/427faa29e06f0709476ea1bd59758f997ec8b64e\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://git.kernel.org/stable/c/f1c7aa87c423e765e3862349c2f095fdfccdd9b3\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://git.kernel.org/stable/c/bb8958d5dc79acbd071397abb57b8756375fe1ce\", \"tags\": [\"x_transferred\"]}], \"providerMetadata\": {\"orgId\": \"af854a3a-2127-422b-91ae-364da2661108\", \"shortName\": \"CVE\", \"dateUpdated\": \"2024-08-04T05:39:59.118Z\"}}, {\"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2021-47414\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2024-05-23T17:52:58.625321Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2024-05-23T17:53:06.064Z\"}, \"title\": \"CISA ADP Vulnrichment\"}], \"cna\": {\"title\": \"riscv: Flush current cpu icache before other cpus\", \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"fab957c11efe2f405e08b9f0d080524bc2631428\", \"lessThan\": \"427faa29e06f0709476ea1bd59758f997ec8b64e\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"fab957c11efe2f405e08b9f0d080524bc2631428\", \"lessThan\": \"f1c7aa87c423e765e3862349c2f095fdfccdd9b3\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"fab957c11efe2f405e08b9f0d080524bc2631428\", \"lessThan\": \"bb8958d5dc79acbd071397abb57b8756375fe1ce\", \"versionType\": \"git\"}], \"programFiles\": [\"arch/riscv/mm/cacheflush.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"4.15\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"4.15\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"5.10.73\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.14.12\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.14.*\"}, {\"status\": \"unaffected\", \"version\": \"5.15\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"arch/riscv/mm/cacheflush.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/427faa29e06f0709476ea1bd59758f997ec8b64e\"}, {\"url\": \"https://git.kernel.org/stable/c/f1c7aa87c423e765e3862349c2f095fdfccdd9b3\"}, {\"url\": \"https://git.kernel.org/stable/c/bb8958d5dc79acbd071397abb57b8756375fe1ce\"}], \"x_generator\": {\"engine\": \"bippy-5f407fcff5a0\"}, \"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\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2024-12-19T07:41:31.810Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2021-47414\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2024-12-19T07:41:31.810Z\", \"dateReserved\": \"2024-05-21T14:58:30.818Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-05-21T15:04:04.715Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}


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