cve-2023-52779
Vulnerability from cvelistv5
Published
2024-05-21 15:30
Modified
2024-08-02 23:11
Severity
Summary
fs: Pass AT_GETATTR_NOSEC flag to getattr interface function
References
SourceURLTags
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/3fb0fa08641903304b9d81d52a379ff031dc41d4
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/8a924db2d7b5eb69ba08b1a0af46e9f1359a9bdf
Impacted products
VendorProduct
LinuxLinux
LinuxLinux
Show details on NVD website

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                "timestamp": "2024-05-29T18:48:07.766160Z",
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          "product": "Linux",
          "programFiles": [
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            "fs/overlayfs/inode.c",
            "fs/overlayfs/overlayfs.h",
            "fs/stat.c",
            "include/uapi/linux/fcntl.h"
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nfs: Pass AT_GETATTR_NOSEC flag to getattr interface function\n\nWhen vfs_getattr_nosec() calls a filesystem\u0027s getattr interface function\nthen the \u0027nosec\u0027 should propagate into this function so that\nvfs_getattr_nosec() can again be called from the filesystem\u0027s gettattr\nrather than vfs_getattr(). The latter would add unnecessary security\nchecks that the initial vfs_getattr_nosec() call wanted to avoid.\nTherefore, introduce the getattr flag GETATTR_NOSEC and allow to pass\nwith the new getattr_flags parameter to the getattr interface function.\nIn overlayfs and ecryptfs use this flag to determine which one of the\ntwo functions to call.\n\nIn a recent code change introduced to IMA vfs_getattr_nosec() ended up\ncalling vfs_getattr() in overlayfs, which in turn called\nsecurity_inode_getattr() on an exiting process that did not have\ncurrent-\u003efs set anymore, which then caused a kernel NULL pointer\ndereference. With this change the call to security_inode_getattr() can\nbe avoided, thus avoiding the NULL pointer dereference."
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    "datePublished": "2024-05-21T15:30:58.899Z",
    "dateReserved": "2024-05-21T15:19:24.240Z",
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    "nvd": "{\"cve\":{\"id\":\"CVE-2023-52779\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-05-21T16:15:16.890\",\"lastModified\":\"2024-05-21T16:53:56.550\",\"vulnStatus\":\"Awaiting Analysis\",\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nfs: Pass AT_GETATTR_NOSEC flag to getattr interface function\\n\\nWhen vfs_getattr_nosec() calls a filesystem\u0027s getattr interface function\\nthen the \u0027nosec\u0027 should propagate into this function so that\\nvfs_getattr_nosec() can again be called from the filesystem\u0027s gettattr\\nrather than vfs_getattr(). The latter would add unnecessary security\\nchecks that the initial vfs_getattr_nosec() call wanted to avoid.\\nTherefore, introduce the getattr flag GETATTR_NOSEC and allow to pass\\nwith the new getattr_flags parameter to the getattr interface function.\\nIn overlayfs and ecryptfs use this flag to determine which one of the\\ntwo functions to call.\\n\\nIn a recent code change introduced to IMA vfs_getattr_nosec() ended up\\ncalling vfs_getattr() in overlayfs, which in turn called\\nsecurity_inode_getattr() on an exiting process that did not have\\ncurrent-\u003efs set anymore, which then caused a kernel NULL pointer\\ndereference. With this change the call to security_inode_getattr() can\\nbe avoided, thus avoiding the NULL pointer dereference.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: fs: pasar el indicador AT_GETATTR_NOSEC a la funci\u00f3n de interfaz getattr. Cuando vfs_getattr_nosec() llama a la funci\u00f3n de interfaz getattr de un sistema de archivos, entonces \u0027nosec\u0027 debe propagarse a esta funci\u00f3n para que se pueda volver a llamar a vfs_getattr_nosec() desde gettattr del sistema de archivos en lugar de vfs_getattr(). Esto \u00faltimo agregar\u00eda controles de seguridad innecesarios que la llamada inicial a vfs_getattr_nosec() quer\u00eda evitar. Por lo tanto, introduzca el indicador getattr GETATTR_NOSEC y permita pasar con el nuevo par\u00e1metro getattr_flags a la funci\u00f3n de interfaz getattr. En overlayfs y ecryptfs use este indicador para determinar cu\u00e1l de las dos funciones llamar. En un cambio de c\u00f3digo reciente introducido en IMA, vfs_getattr_nosec() termin\u00f3 llamando a vfs_getattr() en overlayfs, que a su vez llam\u00f3 a security_inode_getattr() en un proceso saliente que ya no ten\u00eda current-\u0026gt;fs configurado, lo que luego provoc\u00f3 una desreferencia del puntero NULL del kernel . Con este cambio se puede evitar la llamada a security_inode_getattr(), evitando as\u00ed la desreferencia del puntero NULL.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/3fb0fa08641903304b9d81d52a379ff031dc41d4\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/8a924db2d7b5eb69ba08b1a0af46e9f1359a9bdf\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
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