CVE-2022-49779 (GCVE-0-2022-49779)

Vulnerability from cvelistv5 – Published: 2025-05-01 14:09 – Updated: 2025-05-04 08:45
VLAI?
Title
kprobes: Skip clearing aggrprobe's post_handler in kprobe-on-ftrace case
Summary
In the Linux kernel, the following vulnerability has been resolved: kprobes: Skip clearing aggrprobe's post_handler in kprobe-on-ftrace case In __unregister_kprobe_top(), if the currently unregistered probe has post_handler but other child probes of the aggrprobe do not have post_handler, the post_handler of the aggrprobe is cleared. If this is a ftrace-based probe, there is a problem. In later calls to disarm_kprobe(), we will use kprobe_ftrace_ops because post_handler is NULL. But we're armed with kprobe_ipmodify_ops. This triggers a WARN in __disarm_kprobe_ftrace() and may even cause use-after-free: Failed to disarm kprobe-ftrace at kernel_clone+0x0/0x3c0 (error -2) WARNING: CPU: 5 PID: 137 at kernel/kprobes.c:1135 __disarm_kprobe_ftrace.isra.21+0xcf/0xe0 Modules linked in: testKprobe_007(-) CPU: 5 PID: 137 Comm: rmmod Not tainted 6.1.0-rc4-dirty #18 [...] Call Trace: <TASK> __disable_kprobe+0xcd/0xe0 __unregister_kprobe_top+0x12/0x150 ? mutex_lock+0xe/0x30 unregister_kprobes.part.23+0x31/0xa0 unregister_kprobe+0x32/0x40 __x64_sys_delete_module+0x15e/0x260 ? do_user_addr_fault+0x2cd/0x6b0 do_syscall_64+0x3a/0x90 entry_SYSCALL_64_after_hwframe+0x63/0xcd [...] For the kprobe-on-ftrace case, we keep the post_handler setting to identify this aggrprobe armed with kprobe_ipmodify_ops. This way we can disarm it correctly.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 0bc11ed5ab60c135aa764a62c02cd5ea68289de4 , < 7b0007b28dd970176f2e297c06ae63eea2447127 (git)
Affected: 0bc11ed5ab60c135aa764a62c02cd5ea68289de4 , < 7d606ae1abcc3eab5408e42444d789dc7def51b8 (git)
Affected: 0bc11ed5ab60c135aa764a62c02cd5ea68289de4 , < c49cc2c059b503e962c2f13a806c105f9b757df4 (git)
Affected: 0bc11ed5ab60c135aa764a62c02cd5ea68289de4 , < 55788ebbe8b365b4375bd56b4ba7db79d393a370 (git)
Affected: 0bc11ed5ab60c135aa764a62c02cd5ea68289de4 , < 5dd7caf0bdc5d0bae7cf9776b4d739fb09bd5ebb (git)
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    Linux Linux Affected: 5.4
Unaffected: 0 , < 5.4 (semver)
Unaffected: 5.4.225 , ≤ 5.4.* (semver)
Unaffected: 5.10.156 , ≤ 5.10.* (semver)
Unaffected: 5.15.80 , ≤ 5.15.* (semver)
Unaffected: 6.0.10 , ≤ 6.0.* (semver)
Unaffected: 6.1 , ≤ * (original_commit_for_fix)
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{
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      "cpeApplicability": [
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              "cpeMatch": [
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              "negate": false,
              "operator": "OR"
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nkprobes: Skip clearing aggrprobe\u0027s post_handler in kprobe-on-ftrace case\n\nIn __unregister_kprobe_top(), if the currently unregistered probe has\npost_handler but other child probes of the aggrprobe do not have\npost_handler, the post_handler of the aggrprobe is cleared. If this is\na ftrace-based probe, there is a problem. In later calls to\ndisarm_kprobe(), we will use kprobe_ftrace_ops because post_handler is\nNULL. But we\u0027re armed with kprobe_ipmodify_ops. This triggers a WARN in\n__disarm_kprobe_ftrace() and may even cause use-after-free:\n\n  Failed to disarm kprobe-ftrace at kernel_clone+0x0/0x3c0 (error -2)\n  WARNING: CPU: 5 PID: 137 at kernel/kprobes.c:1135 __disarm_kprobe_ftrace.isra.21+0xcf/0xe0\n  Modules linked in: testKprobe_007(-)\n  CPU: 5 PID: 137 Comm: rmmod Not tainted 6.1.0-rc4-dirty #18\n  [...]\n  Call Trace:\n   \u003cTASK\u003e\n   __disable_kprobe+0xcd/0xe0\n   __unregister_kprobe_top+0x12/0x150\n   ? mutex_lock+0xe/0x30\n   unregister_kprobes.part.23+0x31/0xa0\n   unregister_kprobe+0x32/0x40\n   __x64_sys_delete_module+0x15e/0x260\n   ? do_user_addr_fault+0x2cd/0x6b0\n   do_syscall_64+0x3a/0x90\n   entry_SYSCALL_64_after_hwframe+0x63/0xcd\n   [...]\n\nFor the kprobe-on-ftrace case, we keep the post_handler setting to\nidentify this aggrprobe armed with kprobe_ipmodify_ops. This way we\ncan disarm it correctly."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-05-04T08:45:12.098Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/7b0007b28dd970176f2e297c06ae63eea2447127"
        },
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          "url": "https://git.kernel.org/stable/c/7d606ae1abcc3eab5408e42444d789dc7def51b8"
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        {
          "url": "https://git.kernel.org/stable/c/c49cc2c059b503e962c2f13a806c105f9b757df4"
        },
        {
          "url": "https://git.kernel.org/stable/c/55788ebbe8b365b4375bd56b4ba7db79d393a370"
        },
        {
          "url": "https://git.kernel.org/stable/c/5dd7caf0bdc5d0bae7cf9776b4d739fb09bd5ebb"
        }
      ],
      "title": "kprobes: Skip clearing aggrprobe\u0027s post_handler in kprobe-on-ftrace case",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2022-49779",
    "datePublished": "2025-05-01T14:09:14.445Z",
    "dateReserved": "2025-04-16T07:17:33.806Z",
    "dateUpdated": "2025-05-04T08:45:12.098Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1"
}


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