powerpc/pseries: Fix dtl_access_lock to be a rw_semaphore

{
  "id": "2a5caf042c51874e803015baf67a8e1d846a60a32072f747fce9acd8a5369af2",
  "url": "https://osv.dev/vulnerability/CVE-2024-56701",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "powerpc/pseries: Fix dtl_access_lock to be a rw_semaphore",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: powerpc/pseries: Fix dtl_access_lock to be a rw_semaphore The dtl_access_lock needs to be a rw_sempahore, a sleeping lock, because the code calls kmalloc() while holding it, which can sleep: # echo 1 > /proc/powerpc/vcpudispatch_stats BUG: sleeping function called from invalid context at include/linux/sched/mm.h:337 in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 199, name: sh preempt_count: 1, expected: 0 3 locks held by sh/199: #0: c00000000a0743f8 (sb_writers#3){.+.+}-{0:0}, at: vfs_write+0x324/0x438 #1: c0000000028c7058 (dtl_enable_mutex){+.+.}-{3:3}, at: vcpudispatch_stats_write+0xd4/0x5f4 #2: c0000000028c70b8 (dtl_access_lock){+.+.}-{2:2}, at: vcpudispatch_stats_write+0x220/0x5f4 CPU: 0 PID: 199 Comm: sh Not tainted 6.10.0-rc4 #152 Hardware name: IBM pSeries (emulated by qemu) POWER9 (raw) 0x4e1202 0xf000005 of:SLOF,HEAD hv:linux,kvm pSeries Call Trace: dump_stack_lvl+0x130/0x148 (unreliable) __might_resched+0x174/0x410 kmem_cache_alloc_noprof+0x340/0x3d0 alloc_dtl_buffers+0x124/0x1ac vcpudispatch_stats_write+0x2a8/0x5f4 proc_reg_write+0xf4/0x150 vfs_write+0xfc/0x438 ksys_write+0x88/0x148 system_call_exception+0x1c4/0x5a0 system_call_common+0xf4/0x258",
    "evidence": "osv:CVE-2024-56701",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "5.10.231",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "5.15.174",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.1.120",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.6.64",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.11.11",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.12.2",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2024-56701",
      "aliases": [
        "CVE-2024-56701"
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
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                {
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                  "fixed": "525e18f1ba7c2b098c8ba587fb397efb34a6574c"
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                {
                  "fixed": "cadae3a45d23aa4f6485938a67cbc47aaaa25e38"
                }
              ]
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          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2024-56701.json"
          }
        },
        {
          "ranges": [
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              "type": "ECOSYSTEM",
              "events": [
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                  "introduced": "5.3.0"
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            {
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          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2024-56701.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:50.364074672Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/525e18f1ba7c2b098c8ba587fb397efb34a6574c",
        "https://git.kernel.org/stable/c/6956c0e7346ce1bbfc726755aa8da10d26e84276",
        "https://git.kernel.org/stable/c/a246daa26b717e755ccc9061f47f7cd1c0b358dd",
        "https://git.kernel.org/stable/c/b125d0cf1adde7b2b47d7337fed7e9133eea3463",
        "https://git.kernel.org/stable/c/cadae3a45d23aa4f6485938a67cbc47aaaa25e38",
        "https://git.kernel.org/stable/c/f6ec133668757f84e5143f1eb141fd0b83778b9e",
        "https://git.kernel.org/stable/c/fa5b5ea257135e771b489c83a2e93b5935d0108e",
        "https://lists.debian.org/debian-lts-announce/2025/03/msg00001.html",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/56xxx/CVE-2024-56701.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2024-56701",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/56xxx/CVE-2024-56701.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2024-56701",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 518679,
  "published_at": "2024-12-28T09:46:23.516+00:00"
}