CVE-2024-53216
Vulnerability from cvelistv5
Published
2024-12-27 13:50
Modified
2024-12-27 13:50
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: nfsd: release svc_expkey/svc_export with rcu_work The last reference for `cache_head` can be reduced to zero in `c_show` and `e_show`(using `rcu_read_lock` and `rcu_read_unlock`). Consequently, `svc_export_put` and `expkey_put` will be invoked, leading to two issues: 1. The `svc_export_put` will directly free ex_uuid. However, `e_show`/`c_show` will access `ex_uuid` after `cache_put`, which can trigger a use-after-free issue, shown below. ================================================================== BUG: KASAN: slab-use-after-free in svc_export_show+0x362/0x430 [nfsd] Read of size 1 at addr ff11000010fdc120 by task cat/870 CPU: 1 UID: 0 PID: 870 Comm: cat Not tainted 6.12.0-rc3+ #1 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.1-2.fc37 04/01/2014 Call Trace: <TASK> dump_stack_lvl+0x53/0x70 print_address_description.constprop.0+0x2c/0x3a0 print_report+0xb9/0x280 kasan_report+0xae/0xe0 svc_export_show+0x362/0x430 [nfsd] c_show+0x161/0x390 [sunrpc] seq_read_iter+0x589/0x770 seq_read+0x1e5/0x270 proc_reg_read+0xe1/0x140 vfs_read+0x125/0x530 ksys_read+0xc1/0x160 do_syscall_64+0x5f/0x170 entry_SYSCALL_64_after_hwframe+0x76/0x7e Allocated by task 830: kasan_save_stack+0x20/0x40 kasan_save_track+0x14/0x30 __kasan_kmalloc+0x8f/0xa0 __kmalloc_node_track_caller_noprof+0x1bc/0x400 kmemdup_noprof+0x22/0x50 svc_export_parse+0x8a9/0xb80 [nfsd] cache_do_downcall+0x71/0xa0 [sunrpc] cache_write_procfs+0x8e/0xd0 [sunrpc] proc_reg_write+0xe1/0x140 vfs_write+0x1a5/0x6d0 ksys_write+0xc1/0x160 do_syscall_64+0x5f/0x170 entry_SYSCALL_64_after_hwframe+0x76/0x7e Freed by task 868: kasan_save_stack+0x20/0x40 kasan_save_track+0x14/0x30 kasan_save_free_info+0x3b/0x60 __kasan_slab_free+0x37/0x50 kfree+0xf3/0x3e0 svc_export_put+0x87/0xb0 [nfsd] cache_purge+0x17f/0x1f0 [sunrpc] nfsd_destroy_serv+0x226/0x2d0 [nfsd] nfsd_svc+0x125/0x1e0 [nfsd] write_threads+0x16a/0x2a0 [nfsd] nfsctl_transaction_write+0x74/0xa0 [nfsd] vfs_write+0x1a5/0x6d0 ksys_write+0xc1/0x160 do_syscall_64+0x5f/0x170 entry_SYSCALL_64_after_hwframe+0x76/0x7e 2. We cannot sleep while using `rcu_read_lock`/`rcu_read_unlock`. However, `svc_export_put`/`expkey_put` will call path_put, which subsequently triggers a sleeping operation due to the following `dput`. ============================= WARNING: suspicious RCU usage 5.10.0-dirty #141 Not tainted ----------------------------- ... Call Trace: dump_stack+0x9a/0xd0 ___might_sleep+0x231/0x240 dput+0x39/0x600 path_put+0x1b/0x30 svc_export_put+0x17/0x80 e_show+0x1c9/0x200 seq_read_iter+0x63f/0x7c0 seq_read+0x226/0x2d0 vfs_read+0x113/0x2c0 ksys_read+0xc9/0x170 do_syscall_64+0x33/0x40 entry_SYSCALL_64_after_hwframe+0x67/0xd1 Fix these issues by using `rcu_work` to help release `svc_expkey`/`svc_export`. This approach allows for an asynchronous context to invoke `path_put` and also facilitates the freeing of `uuid/exp/key` after an RCU grace period.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/2e4854599200f4d021df8ae17e69221d7c149f3e
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/ad4363a24a5746b257c0beb5d8cc68f9b62c173f
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/bd8524148dd8c123334b066faa90590ba2ef8e6f
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/f8c989a0c89a75d30f899a7cabdc14d72522bb8d
Impacted products
Vendor Product Version
Linux Linux Version: 4.20
Show details on NVD website

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/nfsd/export.c",
            "fs/nfsd/export.h"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "bd8524148dd8c123334b066faa90590ba2ef8e6f",
              "status": "affected",
              "version": "9ceddd9da13434a5906255c0fc528c385aded283",
              "versionType": "git"
            },
            {
              "lessThan": "2e4854599200f4d021df8ae17e69221d7c149f3e",
              "status": "affected",
              "version": "9ceddd9da13434a5906255c0fc528c385aded283",
              "versionType": "git"
            },
            {
              "lessThan": "ad4363a24a5746b257c0beb5d8cc68f9b62c173f",
              "status": "affected",
              "version": "9ceddd9da13434a5906255c0fc528c385aded283",
              "versionType": "git"
            },
            {
              "lessThan": "f8c989a0c89a75d30f899a7cabdc14d72522bb8d",
              "status": "affected",
              "version": "9ceddd9da13434a5906255c0fc528c385aded283",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "fs/nfsd/export.c",
            "fs/nfsd/export.h"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.20"
            },
            {
              "lessThan": "4.20",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.64",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.11.*",
              "status": "unaffected",
              "version": "6.11.11",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.2",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.13-rc1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnfsd: release svc_expkey/svc_export with rcu_work\n\nThe last reference for `cache_head` can be reduced to zero in `c_show`\nand `e_show`(using `rcu_read_lock` and `rcu_read_unlock`). Consequently,\n`svc_export_put` and `expkey_put` will be invoked, leading to two\nissues:\n\n1. The `svc_export_put` will directly free ex_uuid. However,\n   `e_show`/`c_show` will access `ex_uuid` after `cache_put`, which can\n   trigger a use-after-free issue, shown below.\n\n   ==================================================================\n   BUG: KASAN: slab-use-after-free in svc_export_show+0x362/0x430 [nfsd]\n   Read of size 1 at addr ff11000010fdc120 by task cat/870\n\n   CPU: 1 UID: 0 PID: 870 Comm: cat Not tainted 6.12.0-rc3+ #1\n   Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS\n   1.16.1-2.fc37 04/01/2014\n   Call Trace:\n    \u003cTASK\u003e\n    dump_stack_lvl+0x53/0x70\n    print_address_description.constprop.0+0x2c/0x3a0\n    print_report+0xb9/0x280\n    kasan_report+0xae/0xe0\n    svc_export_show+0x362/0x430 [nfsd]\n    c_show+0x161/0x390 [sunrpc]\n    seq_read_iter+0x589/0x770\n    seq_read+0x1e5/0x270\n    proc_reg_read+0xe1/0x140\n    vfs_read+0x125/0x530\n    ksys_read+0xc1/0x160\n    do_syscall_64+0x5f/0x170\n    entry_SYSCALL_64_after_hwframe+0x76/0x7e\n\n   Allocated by task 830:\n    kasan_save_stack+0x20/0x40\n    kasan_save_track+0x14/0x30\n    __kasan_kmalloc+0x8f/0xa0\n    __kmalloc_node_track_caller_noprof+0x1bc/0x400\n    kmemdup_noprof+0x22/0x50\n    svc_export_parse+0x8a9/0xb80 [nfsd]\n    cache_do_downcall+0x71/0xa0 [sunrpc]\n    cache_write_procfs+0x8e/0xd0 [sunrpc]\n    proc_reg_write+0xe1/0x140\n    vfs_write+0x1a5/0x6d0\n    ksys_write+0xc1/0x160\n    do_syscall_64+0x5f/0x170\n    entry_SYSCALL_64_after_hwframe+0x76/0x7e\n\n   Freed by task 868:\n    kasan_save_stack+0x20/0x40\n    kasan_save_track+0x14/0x30\n    kasan_save_free_info+0x3b/0x60\n    __kasan_slab_free+0x37/0x50\n    kfree+0xf3/0x3e0\n    svc_export_put+0x87/0xb0 [nfsd]\n    cache_purge+0x17f/0x1f0 [sunrpc]\n    nfsd_destroy_serv+0x226/0x2d0 [nfsd]\n    nfsd_svc+0x125/0x1e0 [nfsd]\n    write_threads+0x16a/0x2a0 [nfsd]\n    nfsctl_transaction_write+0x74/0xa0 [nfsd]\n    vfs_write+0x1a5/0x6d0\n    ksys_write+0xc1/0x160\n    do_syscall_64+0x5f/0x170\n    entry_SYSCALL_64_after_hwframe+0x76/0x7e\n\n2. We cannot sleep while using `rcu_read_lock`/`rcu_read_unlock`.\n   However, `svc_export_put`/`expkey_put` will call path_put, which\n   subsequently triggers a sleeping operation due to the following\n   `dput`.\n\n   =============================\n   WARNING: suspicious RCU usage\n   5.10.0-dirty #141 Not tainted\n   -----------------------------\n   ...\n   Call Trace:\n   dump_stack+0x9a/0xd0\n   ___might_sleep+0x231/0x240\n   dput+0x39/0x600\n   path_put+0x1b/0x30\n   svc_export_put+0x17/0x80\n   e_show+0x1c9/0x200\n   seq_read_iter+0x63f/0x7c0\n   seq_read+0x226/0x2d0\n   vfs_read+0x113/0x2c0\n   ksys_read+0xc9/0x170\n   do_syscall_64+0x33/0x40\n   entry_SYSCALL_64_after_hwframe+0x67/0xd1\n\nFix these issues by using `rcu_work` to help release\n`svc_expkey`/`svc_export`. This approach allows for an asynchronous\ncontext to invoke `path_put` and also facilitates the freeing of\n`uuid/exp/key` after an RCU grace period."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2024-12-27T13:50:01.869Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/bd8524148dd8c123334b066faa90590ba2ef8e6f"
        },
        {
          "url": "https://git.kernel.org/stable/c/2e4854599200f4d021df8ae17e69221d7c149f3e"
        },
        {
          "url": "https://git.kernel.org/stable/c/ad4363a24a5746b257c0beb5d8cc68f9b62c173f"
        },
        {
          "url": "https://git.kernel.org/stable/c/f8c989a0c89a75d30f899a7cabdc14d72522bb8d"
        }
      ],
      "title": "nfsd: release svc_expkey/svc_export with rcu_work",
      "x_generator": {
        "engine": "bippy-5f407fcff5a0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2024-53216",
    "datePublished": "2024-12-27T13:50:01.869Z",
    "dateReserved": "2024-11-19T17:17:25.024Z",
    "dateUpdated": "2024-12-27T13:50:01.869Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2024-53216\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-12-27T14:15:29.587\",\"lastModified\":\"2024-12-27T14:15:29.587\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nnfsd: release svc_expkey/svc_export with rcu_work\\n\\nThe last reference for `cache_head` can be reduced to zero in `c_show`\\nand `e_show`(using `rcu_read_lock` and `rcu_read_unlock`). Consequently,\\n`svc_export_put` and `expkey_put` will be invoked, leading to two\\nissues:\\n\\n1. The `svc_export_put` will directly free ex_uuid. However,\\n   `e_show`/`c_show` will access `ex_uuid` after `cache_put`, which can\\n   trigger a use-after-free issue, shown below.\\n\\n   ==================================================================\\n   BUG: KASAN: slab-use-after-free in svc_export_show+0x362/0x430 [nfsd]\\n   Read of size 1 at addr ff11000010fdc120 by task cat/870\\n\\n   CPU: 1 UID: 0 PID: 870 Comm: cat Not tainted 6.12.0-rc3+ #1\\n   Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS\\n   1.16.1-2.fc37 04/01/2014\\n   Call Trace:\\n    \u003cTASK\u003e\\n    dump_stack_lvl+0x53/0x70\\n    print_address_description.constprop.0+0x2c/0x3a0\\n    print_report+0xb9/0x280\\n    kasan_report+0xae/0xe0\\n    svc_export_show+0x362/0x430 [nfsd]\\n    c_show+0x161/0x390 [sunrpc]\\n    seq_read_iter+0x589/0x770\\n    seq_read+0x1e5/0x270\\n    proc_reg_read+0xe1/0x140\\n    vfs_read+0x125/0x530\\n    ksys_read+0xc1/0x160\\n    do_syscall_64+0x5f/0x170\\n    entry_SYSCALL_64_after_hwframe+0x76/0x7e\\n\\n   Allocated by task 830:\\n    kasan_save_stack+0x20/0x40\\n    kasan_save_track+0x14/0x30\\n    __kasan_kmalloc+0x8f/0xa0\\n    __kmalloc_node_track_caller_noprof+0x1bc/0x400\\n    kmemdup_noprof+0x22/0x50\\n    svc_export_parse+0x8a9/0xb80 [nfsd]\\n    cache_do_downcall+0x71/0xa0 [sunrpc]\\n    cache_write_procfs+0x8e/0xd0 [sunrpc]\\n    proc_reg_write+0xe1/0x140\\n    vfs_write+0x1a5/0x6d0\\n    ksys_write+0xc1/0x160\\n    do_syscall_64+0x5f/0x170\\n    entry_SYSCALL_64_after_hwframe+0x76/0x7e\\n\\n   Freed by task 868:\\n    kasan_save_stack+0x20/0x40\\n    kasan_save_track+0x14/0x30\\n    kasan_save_free_info+0x3b/0x60\\n    __kasan_slab_free+0x37/0x50\\n    kfree+0xf3/0x3e0\\n    svc_export_put+0x87/0xb0 [nfsd]\\n    cache_purge+0x17f/0x1f0 [sunrpc]\\n    nfsd_destroy_serv+0x226/0x2d0 [nfsd]\\n    nfsd_svc+0x125/0x1e0 [nfsd]\\n    write_threads+0x16a/0x2a0 [nfsd]\\n    nfsctl_transaction_write+0x74/0xa0 [nfsd]\\n    vfs_write+0x1a5/0x6d0\\n    ksys_write+0xc1/0x160\\n    do_syscall_64+0x5f/0x170\\n    entry_SYSCALL_64_after_hwframe+0x76/0x7e\\n\\n2. We cannot sleep while using `rcu_read_lock`/`rcu_read_unlock`.\\n   However, `svc_export_put`/`expkey_put` will call path_put, which\\n   subsequently triggers a sleeping operation due to the following\\n   `dput`.\\n\\n   =============================\\n   WARNING: suspicious RCU usage\\n   5.10.0-dirty #141 Not tainted\\n   -----------------------------\\n   ...\\n   Call Trace:\\n   dump_stack+0x9a/0xd0\\n   ___might_sleep+0x231/0x240\\n   dput+0x39/0x600\\n   path_put+0x1b/0x30\\n   svc_export_put+0x17/0x80\\n   e_show+0x1c9/0x200\\n   seq_read_iter+0x63f/0x7c0\\n   seq_read+0x226/0x2d0\\n   vfs_read+0x113/0x2c0\\n   ksys_read+0xc9/0x170\\n   do_syscall_64+0x33/0x40\\n   entry_SYSCALL_64_after_hwframe+0x67/0xd1\\n\\nFix these issues by using `rcu_work` to help release\\n`svc_expkey`/`svc_export`. This approach allows for an asynchronous\\ncontext to invoke `path_put` and also facilitates the freeing of\\n`uuid/exp/key` after an RCU grace period.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/2e4854599200f4d021df8ae17e69221d7c149f3e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/ad4363a24a5746b257c0beb5d8cc68f9b62c173f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/bd8524148dd8c123334b066faa90590ba2ef8e6f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/f8c989a0c89a75d30f899a7cabdc14d72522bb8d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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