cve-2024-50271
Vulnerability from cvelistv5
Published
2024-11-19 01:30
Modified
2024-12-19 09:37
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: signal: restore the override_rlimit logic Prior to commit d64696905554 ("Reimplement RLIMIT_SIGPENDING on top of ucounts") UCOUNT_RLIMIT_SIGPENDING rlimit was not enforced for a class of signals. However now it's enforced unconditionally, even if override_rlimit is set. This behavior change caused production issues. For example, if the limit is reached and a process receives a SIGSEGV signal, sigqueue_alloc fails to allocate the necessary resources for the signal delivery, preventing the signal from being delivered with siginfo. This prevents the process from correctly identifying the fault address and handling the error. From the user-space perspective, applications are unaware that the limit has been reached and that the siginfo is effectively 'corrupted'. This can lead to unpredictable behavior and crashes, as we observed with java applications. Fix this by passing override_rlimit into inc_rlimit_get_ucounts() and skip the comparison to max there if override_rlimit is set. This effectively restores the old behavior.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/012f4d5d25e9ef92ee129bd5aa7aa60f692681e1Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/0208ea17a1e4456fbfe555f13ae5c28f3d671e40Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/4877d9b2a2ebad3ae240127aaa4cb8258b145cf7Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/9e05e5c7ee8758141d2db7e8fea2cab34500c6edPatch
Impacted products
Vendor Product Version
Linux Linux Version: d64696905554e919321e31afc210606653b8f6a4
Version: d64696905554e919321e31afc210606653b8f6a4
Version: d64696905554e919321e31afc210606653b8f6a4
Version: d64696905554e919321e31afc210606653b8f6a4
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   Linux Linux Version: 5.14
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "include/linux/user_namespace.h",
            "kernel/signal.c",
            "kernel/ucount.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
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              "version": "0",
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsignal: restore the override_rlimit logic\n\nPrior to commit d64696905554 (\"Reimplement RLIMIT_SIGPENDING on top of\nucounts\") UCOUNT_RLIMIT_SIGPENDING rlimit was not enforced for a class of\nsignals.  However now it\u0027s enforced unconditionally, even if\noverride_rlimit is set.  This behavior change caused production issues.  \n\nFor example, if the limit is reached and a process receives a SIGSEGV\nsignal, sigqueue_alloc fails to allocate the necessary resources for the\nsignal delivery, preventing the signal from being delivered with siginfo. \nThis prevents the process from correctly identifying the fault address and\nhandling the error.  From the user-space perspective, applications are\nunaware that the limit has been reached and that the siginfo is\neffectively \u0027corrupted\u0027.  This can lead to unpredictable behavior and\ncrashes, as we observed with java applications.\n\nFix this by passing override_rlimit into inc_rlimit_get_ucounts() and skip\nthe comparison to max there if override_rlimit is set.  This effectively\nrestores the old behavior."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2024-12-19T09:37:00.535Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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        {
          "url": "https://git.kernel.org/stable/c/9e05e5c7ee8758141d2db7e8fea2cab34500c6ed"
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      "title": "signal: restore the override_rlimit logic",
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    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2024-50271",
    "datePublished": "2024-11-19T01:30:09.788Z",
    "dateReserved": "2024-10-21T19:36:19.982Z",
    "dateUpdated": "2024-12-19T09:37:00.535Z",
    "state": "PUBLISHED"
  },
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This behavior change caused production issues.  \\n\\nFor example, if the limit is reached and a process receives a SIGSEGV\\nsignal, sigqueue_alloc fails to allocate the necessary resources for the\\nsignal delivery, preventing the signal from being delivered with siginfo. \\nThis prevents the process from correctly identifying the fault address and\\nhandling the error.  From the user-space perspective, applications are\\nunaware that the limit has been reached and that the siginfo is\\neffectively \u0027corrupted\u0027.  This can lead to unpredictable behavior and\\ncrashes, as we observed with java applications.\\n\\nFix this by passing override_rlimit into inc_rlimit_get_ucounts() and skip\\nthe comparison to max there if override_rlimit is set.  This effectively\\nrestores the old behavior.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: se\u00f1al: restaurar la l\u00f3gica override_rlimit Antes de el commit d64696905554 (\\\"Reimplementar RLIMIT_SIGPENDING sobre ucounts\\\") UCOUNT_RLIMIT_SIGPENDING rlimit no se aplicaba para una clase de se\u00f1ales. Sin embargo, ahora se aplica de forma incondicional, incluso si se establece override_rlimit. Este cambio de comportamiento provoc\u00f3 problemas de producci\u00f3n. Por ejemplo, si se alcanza el l\u00edmite y un proceso recibe una se\u00f1al SIGSEGV, sigqueue_alloc no puede asignar los recursos necesarios para la entrega de la se\u00f1al, lo que impide que la se\u00f1al se entregue con siginfo. Esto impide que el proceso identifique correctamente la direcci\u00f3n de falla y maneje el error. Desde la perspectiva del espacio de usuario, las aplicaciones no saben que se ha alcanzado el l\u00edmite y que la siginfo est\u00e1 efectivamente \\\"corrupta\\\". Esto puede provocar un comportamiento impredecible y fallas, como observamos con las aplicaciones Java. Solucione este problema pasando override_rlimit a inc_rlimit_get_ucounts() y omita la comparaci\u00f3n con max all\u00ed si se configura override_rlimit. 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  }
}


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