cve-2024-46830
Vulnerability from cvelistv5
Published
2024-09-27 12:39
Modified
2024-12-19 09:24
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: KVM: x86: Acquire kvm->srcu when handling KVM_SET_VCPU_EVENTS Grab kvm->srcu when processing KVM_SET_VCPU_EVENTS, as KVM will forcibly leave nested VMX/SVM if SMM mode is being toggled, and leaving nested VMX reads guest memory. Note, kvm_vcpu_ioctl_x86_set_vcpu_events() can also be called from KVM_RUN via sync_regs(), which already holds SRCU. I.e. trying to precisely use kvm_vcpu_srcu_read_lock() around the problematic SMM code would cause problems. Acquiring SRCU isn't all that expensive, so for simplicity, grab it unconditionally for KVM_SET_VCPU_EVENTS. ============================= WARNING: suspicious RCU usage 6.10.0-rc7-332d2c1d713e-next-vm #552 Not tainted ----------------------------- include/linux/kvm_host.h:1027 suspicious rcu_dereference_check() usage! other info that might help us debug this: rcu_scheduler_active = 2, debug_locks = 1 1 lock held by repro/1071: #0: ffff88811e424430 (&vcpu->mutex){+.+.}-{3:3}, at: kvm_vcpu_ioctl+0x7d/0x970 [kvm] stack backtrace: CPU: 15 PID: 1071 Comm: repro Not tainted 6.10.0-rc7-332d2c1d713e-next-vm #552 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 0.0.0 02/06/2015 Call Trace: <TASK> dump_stack_lvl+0x7f/0x90 lockdep_rcu_suspicious+0x13f/0x1a0 kvm_vcpu_gfn_to_memslot+0x168/0x190 [kvm] kvm_vcpu_read_guest+0x3e/0x90 [kvm] nested_vmx_load_msr+0x6b/0x1d0 [kvm_intel] load_vmcs12_host_state+0x432/0xb40 [kvm_intel] vmx_leave_nested+0x30/0x40 [kvm_intel] kvm_vcpu_ioctl_x86_set_vcpu_events+0x15d/0x2b0 [kvm] kvm_arch_vcpu_ioctl+0x1107/0x1750 [kvm] ? mark_held_locks+0x49/0x70 ? kvm_vcpu_ioctl+0x7d/0x970 [kvm] ? kvm_vcpu_ioctl+0x497/0x970 [kvm] kvm_vcpu_ioctl+0x497/0x970 [kvm] ? lock_acquire+0xba/0x2d0 ? find_held_lock+0x2b/0x80 ? do_user_addr_fault+0x40c/0x6f0 ? lock_release+0xb7/0x270 __x64_sys_ioctl+0x82/0xb0 do_syscall_64+0x6c/0x170 entry_SYSCALL_64_after_hwframe+0x4b/0x53 RIP: 0033:0x7ff11eb1b539 </TASK>
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/4bcdd831d9d01e0fb64faea50732b59b2ee88da1Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/939375737b5a0b1bf9b1e75129054e11bc9ca65ePatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/ecdbe8ac86fb5538ccc623a41f88ec96c7168ab9Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/fa297c33faefe51e10244e8a378837fca4963228Patch
Impacted products
Vendor Product Version
Linux Linux Version: f7e570780efc5cec9b2ed1e0472a7da14e864fdb
Version: f7e570780efc5cec9b2ed1e0472a7da14e864fdb
Version: f7e570780efc5cec9b2ed1e0472a7da14e864fdb
Version: f7e570780efc5cec9b2ed1e0472a7da14e864fdb
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   Linux Linux Version: 5.17
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                "id": "CVE-2024-46830",
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                  },
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                "role": "CISA Coordinator",
                "timestamp": "2024-09-29T14:12:09.375859Z",
                "version": "2.0.3"
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          "product": "Linux",
          "programFiles": [
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: x86: Acquire kvm-\u003esrcu when handling KVM_SET_VCPU_EVENTS\n\nGrab kvm-\u003esrcu when processing KVM_SET_VCPU_EVENTS, as KVM will forcibly\nleave nested VMX/SVM if SMM mode is being toggled, and leaving nested VMX\nreads guest memory.\n\nNote, kvm_vcpu_ioctl_x86_set_vcpu_events() can also be called from KVM_RUN\nvia sync_regs(), which already holds SRCU.  I.e. trying to precisely use\nkvm_vcpu_srcu_read_lock() around the problematic SMM code would cause\nproblems.  Acquiring SRCU isn\u0027t all that expensive, so for simplicity,\ngrab it unconditionally for KVM_SET_VCPU_EVENTS.\n\n =============================\n WARNING: suspicious RCU usage\n 6.10.0-rc7-332d2c1d713e-next-vm #552 Not tainted\n -----------------------------\n include/linux/kvm_host.h:1027 suspicious rcu_dereference_check() usage!\n\n other info that might help us debug this:\n\n rcu_scheduler_active = 2, debug_locks = 1\n 1 lock held by repro/1071:\n  #0: ffff88811e424430 (\u0026vcpu-\u003emutex){+.+.}-{3:3}, at: kvm_vcpu_ioctl+0x7d/0x970 [kvm]\n\n stack backtrace:\n CPU: 15 PID: 1071 Comm: repro Not tainted 6.10.0-rc7-332d2c1d713e-next-vm #552\n Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 0.0.0 02/06/2015\n Call Trace:\n  \u003cTASK\u003e\n  dump_stack_lvl+0x7f/0x90\n  lockdep_rcu_suspicious+0x13f/0x1a0\n  kvm_vcpu_gfn_to_memslot+0x168/0x190 [kvm]\n  kvm_vcpu_read_guest+0x3e/0x90 [kvm]\n  nested_vmx_load_msr+0x6b/0x1d0 [kvm_intel]\n  load_vmcs12_host_state+0x432/0xb40 [kvm_intel]\n  vmx_leave_nested+0x30/0x40 [kvm_intel]\n  kvm_vcpu_ioctl_x86_set_vcpu_events+0x15d/0x2b0 [kvm]\n  kvm_arch_vcpu_ioctl+0x1107/0x1750 [kvm]\n  ? mark_held_locks+0x49/0x70\n  ? kvm_vcpu_ioctl+0x7d/0x970 [kvm]\n  ? kvm_vcpu_ioctl+0x497/0x970 [kvm]\n  kvm_vcpu_ioctl+0x497/0x970 [kvm]\n  ? lock_acquire+0xba/0x2d0\n  ? find_held_lock+0x2b/0x80\n  ? do_user_addr_fault+0x40c/0x6f0\n  ? lock_release+0xb7/0x270\n  __x64_sys_ioctl+0x82/0xb0\n  do_syscall_64+0x6c/0x170\n  entry_SYSCALL_64_after_hwframe+0x4b/0x53\n RIP: 0033:0x7ff11eb1b539\n  \u003c/TASK\u003e"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2024-12-19T09:24:04.554Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/fa297c33faefe51e10244e8a378837fca4963228"
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        {
          "url": "https://git.kernel.org/stable/c/4bcdd831d9d01e0fb64faea50732b59b2ee88da1"
        }
      ],
      "title": "KVM: x86: Acquire kvm-\u003esrcu when handling KVM_SET_VCPU_EVENTS",
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        "engine": "bippy-5f407fcff5a0"
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2024-46830",
    "datePublished": "2024-09-27T12:39:28.396Z",
    "dateReserved": "2024-09-11T15:12:18.286Z",
    "dateUpdated": "2024-12-19T09:24:04.554Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
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  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2024-46830\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-09-27T13:15:15.380\",\"lastModified\":\"2024-11-21T14:52:46.250\",\"vulnStatus\":\"Analyzed\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nKVM: x86: Acquire kvm-\u003esrcu when handling KVM_SET_VCPU_EVENTS\\n\\nGrab kvm-\u003esrcu when processing KVM_SET_VCPU_EVENTS, as KVM will forcibly\\nleave nested VMX/SVM if SMM mode is being toggled, and leaving nested VMX\\nreads guest memory.\\n\\nNote, kvm_vcpu_ioctl_x86_set_vcpu_events() can also be called from KVM_RUN\\nvia sync_regs(), which already holds SRCU.  I.e. trying to precisely use\\nkvm_vcpu_srcu_read_lock() around the problematic SMM code would cause\\nproblems.  Acquiring SRCU isn\u0027t all that expensive, so for simplicity,\\ngrab it unconditionally for KVM_SET_VCPU_EVENTS.\\n\\n =============================\\n WARNING: suspicious RCU usage\\n 6.10.0-rc7-332d2c1d713e-next-vm #552 Not tainted\\n -----------------------------\\n include/linux/kvm_host.h:1027 suspicious rcu_dereference_check() usage!\\n\\n other info that might help us debug this:\\n\\n rcu_scheduler_active = 2, debug_locks = 1\\n 1 lock held by repro/1071:\\n  #0: ffff88811e424430 (\u0026vcpu-\u003emutex){+.+.}-{3:3}, at: kvm_vcpu_ioctl+0x7d/0x970 [kvm]\\n\\n stack backtrace:\\n CPU: 15 PID: 1071 Comm: repro Not tainted 6.10.0-rc7-332d2c1d713e-next-vm #552\\n Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 0.0.0 02/06/2015\\n Call Trace:\\n  \u003cTASK\u003e\\n  dump_stack_lvl+0x7f/0x90\\n  lockdep_rcu_suspicious+0x13f/0x1a0\\n  kvm_vcpu_gfn_to_memslot+0x168/0x190 [kvm]\\n  kvm_vcpu_read_guest+0x3e/0x90 [kvm]\\n  nested_vmx_load_msr+0x6b/0x1d0 [kvm_intel]\\n  load_vmcs12_host_state+0x432/0xb40 [kvm_intel]\\n  vmx_leave_nested+0x30/0x40 [kvm_intel]\\n  kvm_vcpu_ioctl_x86_set_vcpu_events+0x15d/0x2b0 [kvm]\\n  kvm_arch_vcpu_ioctl+0x1107/0x1750 [kvm]\\n  ? mark_held_locks+0x49/0x70\\n  ? kvm_vcpu_ioctl+0x7d/0x970 [kvm]\\n  ? kvm_vcpu_ioctl+0x497/0x970 [kvm]\\n  kvm_vcpu_ioctl+0x497/0x970 [kvm]\\n  ? lock_acquire+0xba/0x2d0\\n  ? find_held_lock+0x2b/0x80\\n  ? do_user_addr_fault+0x40c/0x6f0\\n  ? lock_release+0xb7/0x270\\n  __x64_sys_ioctl+0x82/0xb0\\n  do_syscall_64+0x6c/0x170\\n  entry_SYSCALL_64_after_hwframe+0x4b/0x53\\n RIP: 0033:0x7ff11eb1b539\\n  \u003c/TASK\u003e\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: KVM: x86: Adquirir kvm-\u0026gt;srcu al manejar KVM_SET_VCPU_EVENTS Adquiera kvm-\u0026gt;srcu al procesar KVM_SET_VCPU_EVENTS, ya que KVM abandonar\u00e1 a la fuerza el VMX/SVM anidado si se alterna el modo SMM, y al abandonar el VMX anidado se lee la memoria del invitado. Tenga en cuenta que kvm_vcpu_ioctl_x86_set_vcpu_events() tambi\u00e9n se puede llamar desde KVM_RUN a trav\u00e9s de sync_regs(), que ya contiene SRCU. Es decir, intentar usar con precisi\u00f3n kvm_vcpu_srcu_read_lock() alrededor del c\u00f3digo SMM problem\u00e1tico causar\u00eda problemas. Adquirir SRCU no es tan caro, as\u00ed que para simplificar, t\u00f3melo incondicionalmente para KVM_SET_VCPU_EVENTS. ============================= ADVERTENCIA: uso sospechoso de RCU 6.10.0-rc7-332d2c1d713e-next-vm #552 No contaminado ----------------------------- include/linux/kvm_host.h:1027 \u00a1Uso sospechoso de rcu_dereference_check()! Otra informaci\u00f3n que podr\u00eda ayudarnos a depurar esto: rcu_scheduler_active = 2, debug_locks = 1 1 bloqueo retenido por repro/1071: #0: ffff88811e424430 (\u0026amp;vcpu-\u0026gt;mutex){+.+.}-{3:3}, en: kvm_vcpu_ioctl+0x7d/0x970 [kvm] seguimiento de pila: CPU: 15 PID: 1071 Comm: repro No contaminado 6.10.0-rc7-332d2c1d713e-next-vm #552 Nombre del hardware: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 0.0.0 02/06/2015 Seguimiento de llamadas:  dump_stack_lvl+0x7f/0x90 kvm_vcpu_ioctl_x86_set_vcpu_events+0x15d/0x2b0 [kvm] kvm_arch_vcpu_ioctl+0x1107/0x1750 [kvm] ? kvm_vcpu_ioctl+0x497/0x970 [kvm] kvm_vcpu_ioctl+0x497/0x970 [kvm] ? bloqueo_adquirir+0xba/0x2d0 ? encontrar_bloqueo_retenido+0x2b/0x80 ? hacer_error_direcci\u00f3n_usuario+0x40c/0x6f0 ? liberaci\u00f3n_de_bloqueo+0xb7/0x270 __x64_sys_ioctl+0x82/0xb0 hacer_llamada_al_sistema_64+0x6c/0x170 entrada_SYSCALL_64_despu\u00e9s_de_hwframe+0x4b/0x53 RIP: 0033:0x7ff11eb1b539 \"}],\"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:H/I:H/A:H\",\"baseScore\":7.8,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":5.9}]},\"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\":\"5.17\",\"versionEndExcluding\":\"6.1.110\",\"matchCriteriaId\":\"BBF34251-254C-4A5B-A072-3C3A93781706\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.2\",\"versionEndExcluding\":\"6.6.51\",\"matchCriteriaId\":\"E4529134-BAC4-4776-840B-304009E181A0\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.7\",\"versionEndExcluding\":\"6.10.10\",\"matchCriteriaId\":\"ACDEE48C-137A-4731-90D0-A675865E1BED\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:5.10.97:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"4519128A-26A9-4476-8F13-E1BBD83880BF\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:5.15.19:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"2B600A1B-5001-4778-8D8B-3807206CC8BD\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:5.16.5:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"4FD1CB23-AA16-4EC2-920F-55BF92FFBCCC\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.11:rc1:*:*:*:*:*:*\",\"matchCriteriaId\":\"8B3CE743-2126-47A3-8B7C-822B502CF119\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.11:rc2:*:*:*:*:*:*\",\"matchCriteriaId\":\"4DEB27E7-30AA-45CC-8934-B89263EF3551\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.11:rc3:*:*:*:*:*:*\",\"matchCriteriaId\":\"E0005AEF-856E-47EB-BFE4-90C46899394D\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.11:rc4:*:*:*:*:*:*\",\"matchCriteriaId\":\"39889A68-6D34-47A6-82FC-CD0BF23D6754\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.11:rc5:*:*:*:*:*:*\",\"matchCriteriaId\":\"B8383ABF-1457-401F-9B61-EE50F4C61F4F\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.11:rc6:*:*:*:*:*:*\",\"matchCriteriaId\":\"B77A9280-37E6-49AD-B559-5B23A3B1DC3D\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/4bcdd831d9d01e0fb64faea50732b59b2ee88da1\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/939375737b5a0b1bf9b1e75129054e11bc9ca65e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/ecdbe8ac86fb5538ccc623a41f88ec96c7168ab9\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/fa297c33faefe51e10244e8a378837fca4963228\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]}]}}",
    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2024-46830\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2024-09-29T14:12:09.375859Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2024-09-29T14:12:10.454Z\"}}], \"cna\": {\"title\": \"KVM: x86: Acquire kvm-\u003esrcu when handling KVM_SET_VCPU_EVENTS\", \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"f7e570780efc\", \"lessThan\": \"fa297c33faef\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"f7e570780efc\", \"lessThan\": \"939375737b5a\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"f7e570780efc\", \"lessThan\": \"ecdbe8ac86fb\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"f7e570780efc\", \"lessThan\": \"4bcdd831d9d0\", \"versionType\": \"git\"}], \"programFiles\": [\"arch/x86/kvm/x86.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"5.17\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"5.17\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"6.1.110\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.1.*\"}, {\"status\": \"unaffected\", \"version\": \"6.6.51\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.6.*\"}, {\"status\": \"unaffected\", \"version\": \"6.10.10\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.10.*\"}, {\"status\": \"unaffected\", \"version\": \"6.11\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"arch/x86/kvm/x86.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/fa297c33faefe51e10244e8a378837fca4963228\"}, {\"url\": \"https://git.kernel.org/stable/c/939375737b5a0b1bf9b1e75129054e11bc9ca65e\"}, {\"url\": \"https://git.kernel.org/stable/c/ecdbe8ac86fb5538ccc623a41f88ec96c7168ab9\"}, {\"url\": \"https://git.kernel.org/stable/c/4bcdd831d9d01e0fb64faea50732b59b2ee88da1\"}], \"x_generator\": {\"engine\": \"bippy-9e1c9544281a\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nKVM: x86: Acquire kvm-\u003esrcu when handling KVM_SET_VCPU_EVENTS\\n\\nGrab kvm-\u003esrcu when processing KVM_SET_VCPU_EVENTS, as KVM will forcibly\\nleave nested VMX/SVM if SMM mode is being toggled, and leaving nested VMX\\nreads guest memory.\\n\\nNote, kvm_vcpu_ioctl_x86_set_vcpu_events() can also be called from KVM_RUN\\nvia sync_regs(), which already holds SRCU.  I.e. trying to precisely use\\nkvm_vcpu_srcu_read_lock() around the problematic SMM code would cause\\nproblems.  Acquiring SRCU isn\u0027t all that expensive, so for simplicity,\\ngrab it unconditionally for KVM_SET_VCPU_EVENTS.\\n\\n =============================\\n WARNING: suspicious RCU usage\\n 6.10.0-rc7-332d2c1d713e-next-vm #552 Not tainted\\n -----------------------------\\n include/linux/kvm_host.h:1027 suspicious rcu_dereference_check() usage!\\n\\n other info that might help us debug this:\\n\\n rcu_scheduler_active = 2, debug_locks = 1\\n 1 lock held by repro/1071:\\n  #0: ffff88811e424430 (\u0026vcpu-\u003emutex){+.+.}-{3:3}, at: kvm_vcpu_ioctl+0x7d/0x970 [kvm]\\n\\n stack backtrace:\\n CPU: 15 PID: 1071 Comm: repro Not tainted 6.10.0-rc7-332d2c1d713e-next-vm #552\\n Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 0.0.0 02/06/2015\\n Call Trace:\\n  \u003cTASK\u003e\\n  dump_stack_lvl+0x7f/0x90\\n  lockdep_rcu_suspicious+0x13f/0x1a0\\n  kvm_vcpu_gfn_to_memslot+0x168/0x190 [kvm]\\n  kvm_vcpu_read_guest+0x3e/0x90 [kvm]\\n  nested_vmx_load_msr+0x6b/0x1d0 [kvm_intel]\\n  load_vmcs12_host_state+0x432/0xb40 [kvm_intel]\\n  vmx_leave_nested+0x30/0x40 [kvm_intel]\\n  kvm_vcpu_ioctl_x86_set_vcpu_events+0x15d/0x2b0 [kvm]\\n  kvm_arch_vcpu_ioctl+0x1107/0x1750 [kvm]\\n  ? mark_held_locks+0x49/0x70\\n  ? kvm_vcpu_ioctl+0x7d/0x970 [kvm]\\n  ? kvm_vcpu_ioctl+0x497/0x970 [kvm]\\n  kvm_vcpu_ioctl+0x497/0x970 [kvm]\\n  ? lock_acquire+0xba/0x2d0\\n  ? find_held_lock+0x2b/0x80\\n  ? do_user_addr_fault+0x40c/0x6f0\\n  ? lock_release+0xb7/0x270\\n  __x64_sys_ioctl+0x82/0xb0\\n  do_syscall_64+0x6c/0x170\\n  entry_SYSCALL_64_after_hwframe+0x4b/0x53\\n RIP: 0033:0x7ff11eb1b539\\n  \u003c/TASK\u003e\"}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2024-11-05T09:47:27.124Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2024-46830\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2024-11-05T09:47:27.124Z\", \"dateReserved\": \"2024-09-11T15:12:18.286Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-09-27T12:39:28.396Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}


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