CVE-2021-47428 (GCVE-0-2021-47428)

Vulnerability from cvelistv5 – Published: 2024-05-21 15:04 – Updated: 2025-05-04 07:10
VLAI?
Title
powerpc/64s: fix program check interrupt emergency stack path
Summary
In the Linux kernel, the following vulnerability has been resolved: powerpc/64s: fix program check interrupt emergency stack path Emergency stack path was jumping into a 3: label inside the __GEN_COMMON_BODY macro for the normal path after it had finished, rather than jumping over it. By a small miracle this is the correct place to build up a new interrupt frame with the existing stack pointer, so things basically worked okay with an added weird looking 700 trap frame on top (which had the wrong ->nip so it didn't decode bug messages either). Fix this by avoiding using numeric labels when jumping over non-trivial macros. Before: LE PAGE_SIZE=64K MMU=Radix SMP NR_CPUS=2048 NUMA PowerNV Modules linked in: CPU: 0 PID: 88 Comm: sh Not tainted 5.15.0-rc2-00034-ge057cdade6e5 #2637 NIP: 7265677368657265 LR: c00000000006c0c8 CTR: c0000000000097f0 REGS: c0000000fffb3a50 TRAP: 0700 Not tainted MSR: 9000000000021031 <SF,HV,ME,IR,DR,LE> CR: 00000700 XER: 20040000 CFAR: c0000000000098b0 IRQMASK: 0 GPR00: c00000000006c964 c0000000fffb3cf0 c000000001513800 0000000000000000 GPR04: 0000000048ab0778 0000000042000000 0000000000000000 0000000000001299 GPR08: 000001e447c718ec 0000000022424282 0000000000002710 c00000000006bee8 GPR12: 9000000000009033 c0000000016b0000 00000000000000b0 0000000000000001 GPR16: 0000000000000000 0000000000000002 0000000000000000 0000000000000ff8 GPR20: 0000000000001fff 0000000000000007 0000000000000080 00007fff89d90158 GPR24: 0000000002000000 0000000002000000 0000000000000255 0000000000000300 GPR28: c000000001270000 0000000042000000 0000000048ab0778 c000000080647e80 NIP [7265677368657265] 0x7265677368657265 LR [c00000000006c0c8] ___do_page_fault+0x3f8/0xb10 Call Trace: [c0000000fffb3cf0] [c00000000000bdac] soft_nmi_common+0x13c/0x1d0 (unreliable) --- interrupt: 700 at decrementer_common_virt+0xb8/0x230 NIP: c0000000000098b8 LR: c00000000006c0c8 CTR: c0000000000097f0 REGS: c0000000fffb3d60 TRAP: 0700 Not tainted MSR: 9000000000021031 <SF,HV,ME,IR,DR,LE> CR: 22424282 XER: 20040000 CFAR: c0000000000098b0 IRQMASK: 0 GPR00: c00000000006c964 0000000000002400 c000000001513800 0000000000000000 GPR04: 0000000048ab0778 0000000042000000 0000000000000000 0000000000001299 GPR08: 000001e447c718ec 0000000022424282 0000000000002710 c00000000006bee8 GPR12: 9000000000009033 c0000000016b0000 00000000000000b0 0000000000000001 GPR16: 0000000000000000 0000000000000002 0000000000000000 0000000000000ff8 GPR20: 0000000000001fff 0000000000000007 0000000000000080 00007fff89d90158 GPR24: 0000000002000000 0000000002000000 0000000000000255 0000000000000300 GPR28: c000000001270000 0000000042000000 0000000048ab0778 c000000080647e80 NIP [c0000000000098b8] decrementer_common_virt+0xb8/0x230 LR [c00000000006c0c8] ___do_page_fault+0x3f8/0xb10 --- interrupt: 700 Instruction dump: XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX ---[ end trace 6d28218e0cc3c949 ]--- After: ------------[ cut here ]------------ kernel BUG at arch/powerpc/kernel/exceptions-64s.S:491! Oops: Exception in kernel mode, sig: 5 [#1] LE PAGE_SIZE=64K MMU=Radix SMP NR_CPUS=2048 NUMA PowerNV Modules linked in: CPU: 0 PID: 88 Comm: login Not tainted 5.15.0-rc2-00034-ge057cdade6e5-dirty #2638 NIP: c0000000000098b8 LR: c00000000006bf04 CTR: c0000000000097f0 REGS: c0000000fffb3d60 TRAP: 0700 Not tainted MSR: 9000000000021031 <SF,HV,ME,IR,DR,LE> CR: 24482227 XER: 00040000 CFAR: c0000000000098b0 IRQMASK: 0 GPR00: c00000000006bf04 0000000000002400 c000000001513800 c000000001271868 GPR04: 00000000100f0d29 0000000042000000 0000000000000007 0000000000000009 GPR08: 00000000100f0d29 0000000024482227 0000000000002710 c000000000181b3c GPR12: 9000000000009033 c0000000016b0000 00000000100f0d29 c000000005b22f00 GPR16: 00000000ffff0000 0000000000000001 0000000000000009 00000000100eed90 GPR20: 00000000100eed90 00000 ---truncated---
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 0a882e28468f48ab3d9a36dde0a5723ea29ed1ed , < 411b38fe68ba20a8bbe724b0939762c3f16e16ca (git)
Affected: 0a882e28468f48ab3d9a36dde0a5723ea29ed1ed , < c835b3d1d6362b4a4ebb192da7e7fd27a0a45d01 (git)
Affected: 0a882e28468f48ab3d9a36dde0a5723ea29ed1ed , < 3e607dc4df180b72a38e75030cb0f94d12808712 (git)
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    Linux Linux Affected: 5.3
Unaffected: 0 , < 5.3 (semver)
Unaffected: 5.10.73 , ≤ 5.10.* (semver)
Unaffected: 5.14.12 , ≤ 5.14.* (semver)
Unaffected: 5.15 , ≤ * (original_commit_for_fix)
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    "vulnrichment": {
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By a small miracle this is the correct\\nplace to build up a new interrupt frame with the existing stack\\npointer, so things basically worked okay with an added weird looking\\n700 trap frame on top (which had the wrong -\u003enip so it didn\u0027t decode\\nbug messages either).\\n\\nFix this by avoiding using numeric labels when jumping over non-trivial\\nmacros.\\n\\nBefore:\\n\\n LE PAGE_SIZE=64K MMU=Radix SMP NR_CPUS=2048 NUMA PowerNV\\n Modules linked in:\\n CPU: 0 PID: 88 Comm: sh Not tainted 5.15.0-rc2-00034-ge057cdade6e5 #2637\\n NIP:  7265677368657265 LR: c00000000006c0c8 CTR: c0000000000097f0\\n REGS: c0000000fffb3a50 TRAP: 0700   Not tainted\\n MSR:  9000000000021031 \u003cSF,HV,ME,IR,DR,LE\u003e  CR: 00000700  XER: 20040000\\n CFAR: c0000000000098b0 IRQMASK: 0\\n GPR00: c00000000006c964 c0000000fffb3cf0 c000000001513800 0000000000000000\\n GPR04: 0000000048ab0778 0000000042000000 0000000000000000 0000000000001299\\n GPR08: 000001e447c718ec 0000000022424282 0000000000002710 c00000000006bee8\\n GPR12: 9000000000009033 c0000000016b0000 00000000000000b0 0000000000000001\\n GPR16: 0000000000000000 0000000000000002 0000000000000000 0000000000000ff8\\n GPR20: 0000000000001fff 0000000000000007 0000000000000080 00007fff89d90158\\n GPR24: 0000000002000000 0000000002000000 0000000000000255 0000000000000300\\n GPR28: c000000001270000 0000000042000000 0000000048ab0778 c000000080647e80\\n NIP [7265677368657265] 0x7265677368657265\\n LR [c00000000006c0c8] ___do_page_fault+0x3f8/0xb10\\n Call Trace:\\n [c0000000fffb3cf0] [c00000000000bdac] soft_nmi_common+0x13c/0x1d0 (unreliable)\\n --- interrupt: 700 at decrementer_common_virt+0xb8/0x230\\n NIP:  c0000000000098b8 LR: c00000000006c0c8 CTR: c0000000000097f0\\n REGS: c0000000fffb3d60 TRAP: 0700   Not tainted\\n MSR:  9000000000021031 \u003cSF,HV,ME,IR,DR,LE\u003e  CR: 22424282  XER: 20040000\\n CFAR: c0000000000098b0 IRQMASK: 0\\n GPR00: c00000000006c964 0000000000002400 c000000001513800 0000000000000000\\n GPR04: 0000000048ab0778 0000000042000000 0000000000000000 0000000000001299\\n GPR08: 000001e447c718ec 0000000022424282 0000000000002710 c00000000006bee8\\n GPR12: 9000000000009033 c0000000016b0000 00000000000000b0 0000000000000001\\n GPR16: 0000000000000000 0000000000000002 0000000000000000 0000000000000ff8\\n GPR20: 0000000000001fff 0000000000000007 0000000000000080 00007fff89d90158\\n GPR24: 0000000002000000 0000000002000000 0000000000000255 0000000000000300\\n GPR28: c000000001270000 0000000042000000 0000000048ab0778 c000000080647e80\\n NIP [c0000000000098b8] decrementer_common_virt+0xb8/0x230\\n LR [c00000000006c0c8] ___do_page_fault+0x3f8/0xb10\\n --- interrupt: 700\\n Instruction dump:\\n XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX\\n XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX XXXXXXXX\\n ---[ end trace 6d28218e0cc3c949 ]---\\n\\nAfter:\\n\\n ------------[ cut here ]------------\\n kernel BUG at arch/powerpc/kernel/exceptions-64s.S:491!\\n Oops: Exception in kernel mode, sig: 5 [#1]\\n LE PAGE_SIZE=64K MMU=Radix SMP NR_CPUS=2048 NUMA PowerNV\\n Modules linked in:\\n CPU: 0 PID: 88 Comm: login Not tainted 5.15.0-rc2-00034-ge057cdade6e5-dirty #2638\\n NIP:  c0000000000098b8 LR: c00000000006bf04 CTR: c0000000000097f0\\n REGS: c0000000fffb3d60 TRAP: 0700   Not tainted\\n MSR:  9000000000021031 \u003cSF,HV,ME,IR,DR,LE\u003e  CR: 24482227  XER: 00040000\\n CFAR: c0000000000098b0 IRQMASK: 0\\n GPR00: c00000000006bf04 0000000000002400 c000000001513800 c000000001271868\\n GPR04: 00000000100f0d29 0000000042000000 0000000000000007 0000000000000009\\n GPR08: 00000000100f0d29 0000000024482227 0000000000002710 c000000000181b3c\\n GPR12: 9000000000009033 c0000000016b0000 00000000100f0d29 c000000005b22f00\\n GPR16: 00000000ffff0000 0000000000000001 0000000000000009 00000000100eed90\\n GPR20: 00000000100eed90 00000\\n---truncated---\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.73\", \"versionStartIncluding\": \"5.3\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.14.12\", \"versionStartIncluding\": \"5.3\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15\", \"versionStartIncluding\": \"5.3\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2025-05-04T07:10:42.144Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2021-47428\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-05-04T07:10:42.144Z\", \"dateReserved\": \"2024-05-21T14:58:30.828Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-05-21T15:04:13.910Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}


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Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Detection rules are retrieved from Rulezet.