cve-2024-35934
Vulnerability from cvelistv5
Published
2024-05-19 10:10
Modified
2024-09-11 17:33
Severity
Summary
net/smc: reduce rtnl pressure in smc_pnet_create_pnetids_list()
References
SourceURLTags
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/00af2aa93b76b1bade471ad0d0525d4d29ca5cc0
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/6e920422e7104928f760fc0e12b6d65ab097a2e7
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/a2e6bffc0388526ed10406040279a693d62b36ec
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/b9117dc783c0ab0a3866812f70e07bf2ea071ac4
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/bc4d1ebca11b4f194e262326bd45938e857c59d2
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/d7ee3bf0caf599c14db0bf4af7aacd6206ef8a23
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://lists.debian.org/debian-lts-announce/2024/06/msg00017.html
Impacted products
VendorProduct
LinuxLinux
LinuxLinux
Show details on NVD website

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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/smc: reduce rtnl pressure in smc_pnet_create_pnetids_list()\n\nMany syzbot reports show extreme rtnl pressure, and many of them hint\nthat smc acquires rtnl in netns creation for no good reason [1]\n\nThis patch returns early from smc_pnet_net_init()\nif there is no netdevice yet.\n\nI am not even sure why smc_pnet_create_pnetids_list() even exists,\nbecause smc_pnet_netdev_event() is also calling\nsmc_pnet_add_base_pnetid() when handling NETDEV_UP event.\n\n[1] extract of typical syzbot reports\n\n2 locks held by syz-executor.3/12252:\n  #0: ffffffff8f369610 (pernet_ops_rwsem){++++}-{3:3}, at: copy_net_ns+0x4c7/0x7b0 net/core/net_namespace.c:491\n  #1: ffffffff8f375b88 (rtnl_mutex){+.+.}-{3:3}, at: smc_pnet_create_pnetids_list net/smc/smc_pnet.c:809 [inline]\n  #1: ffffffff8f375b88 (rtnl_mutex){+.+.}-{3:3}, at: smc_pnet_net_init+0x10a/0x1e0 net/smc/smc_pnet.c:878\n2 locks held by syz-executor.4/12253:\n  #0: ffffffff8f369610 (pernet_ops_rwsem){++++}-{3:3}, at: copy_net_ns+0x4c7/0x7b0 net/core/net_namespace.c:491\n  #1: ffffffff8f375b88 (rtnl_mutex){+.+.}-{3:3}, at: smc_pnet_create_pnetids_list net/smc/smc_pnet.c:809 [inline]\n  #1: ffffffff8f375b88 (rtnl_mutex){+.+.}-{3:3}, at: smc_pnet_net_init+0x10a/0x1e0 net/smc/smc_pnet.c:878\n2 locks held by syz-executor.1/12257:\n  #0: ffffffff8f369610 (pernet_ops_rwsem){++++}-{3:3}, at: copy_net_ns+0x4c7/0x7b0 net/core/net_namespace.c:491\n  #1: ffffffff8f375b88 (rtnl_mutex){+.+.}-{3:3}, at: smc_pnet_create_pnetids_list net/smc/smc_pnet.c:809 [inline]\n  #1: ffffffff8f375b88 (rtnl_mutex){+.+.}-{3:3}, at: smc_pnet_net_init+0x10a/0x1e0 net/smc/smc_pnet.c:878\n2 locks held by syz-executor.2/12261:\n  #0: ffffffff8f369610 (pernet_ops_rwsem){++++}-{3:3}, at: copy_net_ns+0x4c7/0x7b0 net/core/net_namespace.c:491\n  #1: ffffffff8f375b88 (rtnl_mutex){+.+.}-{3:3}, at: smc_pnet_create_pnetids_list net/smc/smc_pnet.c:809 [inline]\n  #1: ffffffff8f375b88 (rtnl_mutex){+.+.}-{3:3}, at: smc_pnet_net_init+0x10a/0x1e0 net/smc/smc_pnet.c:878\n2 locks held by syz-executor.0/12265:\n  #0: ffffffff8f369610 (pernet_ops_rwsem){++++}-{3:3}, at: copy_net_ns+0x4c7/0x7b0 net/core/net_namespace.c:491\n  #1: ffffffff8f375b88 (rtnl_mutex){+.+.}-{3:3}, at: smc_pnet_create_pnetids_list net/smc/smc_pnet.c:809 [inline]\n  #1: ffffffff8f375b88 (rtnl_mutex){+.+.}-{3:3}, at: smc_pnet_net_init+0x10a/0x1e0 net/smc/smc_pnet.c:878\n2 locks held by syz-executor.3/12268:\n  #0: ffffffff8f369610 (pernet_ops_rwsem){++++}-{3:3}, at: copy_net_ns+0x4c7/0x7b0 net/core/net_namespace.c:491\n  #1: ffffffff8f375b88 (rtnl_mutex){+.+.}-{3:3}, at: smc_pnet_create_pnetids_list net/smc/smc_pnet.c:809 [inline]\n  #1: ffffffff8f375b88 (rtnl_mutex){+.+.}-{3:3}, at: smc_pnet_net_init+0x10a/0x1e0 net/smc/smc_pnet.c:878\n2 locks held by syz-executor.4/12271:\n  #0: ffffffff8f369610 (pernet_ops_rwsem){++++}-{3:3}, at: copy_net_ns+0x4c7/0x7b0 net/core/net_namespace.c:491\n  #1: ffffffff8f375b88 (rtnl_mutex){+.+.}-{3:3}, at: smc_pnet_create_pnetids_list net/smc/smc_pnet.c:809 [inline]\n  #1: ffffffff8f375b88 (rtnl_mutex){+.+.}-{3:3}, at: smc_pnet_net_init+0x10a/0x1e0 net/smc/smc_pnet.c:878\n2 locks held by syz-executor.1/12274:\n  #0: ffffffff8f369610 (pernet_ops_rwsem){++++}-{3:3}, at: copy_net_ns+0x4c7/0x7b0 net/core/net_namespace.c:491\n  #1: ffffffff8f375b88 (rtnl_mutex){+.+.}-{3:3}, at: smc_pnet_create_pnetids_list net/smc/smc_pnet.c:809 [inline]\n  #1: ffffffff8f375b88 (rtnl_mutex){+.+.}-{3:3}, at: smc_pnet_net_init+0x10a/0x1e0 net/smc/smc_pnet.c:878\n2 locks held by syz-executor.2/12280:\n  #0: ffffffff8f369610 (pernet_ops_rwsem){++++}-{3:3}, at: copy_net_ns+0x4c7/0x7b0 net/core/net_namespace.c:491\n  #1: ffffffff8f375b88 (rtnl_mutex){+.+.}-{3:3}, at: smc_pnet_create_pnetids_list net/smc/smc_pnet.c:809 [inline]\n  #1: ffffffff8f375b88 (rtnl_mutex){+.+.}-{3:3}, at: smc_pnet_net_init+0x10a/0x1e0 net/smc/smc_pnet.c:878"
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  "cveMetadata": {
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    "assignerShortName": "Linux",
    "cveId": "CVE-2024-35934",
    "datePublished": "2024-05-19T10:10:41.668Z",
    "dateReserved": "2024-05-17T13:50:33.130Z",
    "dateUpdated": "2024-09-11T17:33:15.404Z",
    "state": "PUBLISHED"
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    "nvd": "{\"cve\":{\"id\":\"CVE-2024-35934\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-05-19T11:15:49.343\",\"lastModified\":\"2024-06-25T22:15:33.297\",\"vulnStatus\":\"Awaiting Analysis\",\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nnet/smc: reduce rtnl pressure in smc_pnet_create_pnetids_list()\\n\\nMany syzbot reports show extreme rtnl pressure, and many of them hint\\nthat smc acquires rtnl in netns creation for no good reason [1]\\n\\nThis patch returns early from smc_pnet_net_init()\\nif there is no netdevice yet.\\n\\nI am not even sure why smc_pnet_create_pnetids_list() even exists,\\nbecause smc_pnet_netdev_event() is also calling\\nsmc_pnet_add_base_pnetid() when handling NETDEV_UP event.\\n\\n[1] extract of typical syzbot reports\\n\\n2 locks held by syz-executor.3/12252:\\n  #0: ffffffff8f369610 (pernet_ops_rwsem){++++}-{3:3}, at: copy_net_ns+0x4c7/0x7b0 net/core/net_namespace.c:491\\n  #1: ffffffff8f375b88 (rtnl_mutex){+.+.}-{3:3}, at: smc_pnet_create_pnetids_list net/smc/smc_pnet.c:809 [inline]\\n  #1: ffffffff8f375b88 (rtnl_mutex){+.+.}-{3:3}, at: smc_pnet_net_init+0x10a/0x1e0 net/smc/smc_pnet.c:878\\n2 locks held by syz-executor.4/12253:\\n  #0: ffffffff8f369610 (pernet_ops_rwsem){++++}-{3:3}, at: copy_net_ns+0x4c7/0x7b0 net/core/net_namespace.c:491\\n  #1: ffffffff8f375b88 (rtnl_mutex){+.+.}-{3:3}, at: smc_pnet_create_pnetids_list net/smc/smc_pnet.c:809 [inline]\\n  #1: ffffffff8f375b88 (rtnl_mutex){+.+.}-{3:3}, at: smc_pnet_net_init+0x10a/0x1e0 net/smc/smc_pnet.c:878\\n2 locks held by syz-executor.1/12257:\\n  #0: ffffffff8f369610 (pernet_ops_rwsem){++++}-{3:3}, at: copy_net_ns+0x4c7/0x7b0 net/core/net_namespace.c:491\\n  #1: ffffffff8f375b88 (rtnl_mutex){+.+.}-{3:3}, at: smc_pnet_create_pnetids_list net/smc/smc_pnet.c:809 [inline]\\n  #1: ffffffff8f375b88 (rtnl_mutex){+.+.}-{3:3}, at: smc_pnet_net_init+0x10a/0x1e0 net/smc/smc_pnet.c:878\\n2 locks held by syz-executor.2/12261:\\n  #0: ffffffff8f369610 (pernet_ops_rwsem){++++}-{3:3}, at: copy_net_ns+0x4c7/0x7b0 net/core/net_namespace.c:491\\n  #1: ffffffff8f375b88 (rtnl_mutex){+.+.}-{3:3}, at: smc_pnet_create_pnetids_list net/smc/smc_pnet.c:809 [inline]\\n  #1: ffffffff8f375b88 (rtnl_mutex){+.+.}-{3:3}, at: smc_pnet_net_init+0x10a/0x1e0 net/smc/smc_pnet.c:878\\n2 locks held by syz-executor.0/12265:\\n  #0: ffffffff8f369610 (pernet_ops_rwsem){++++}-{3:3}, at: copy_net_ns+0x4c7/0x7b0 net/core/net_namespace.c:491\\n  #1: ffffffff8f375b88 (rtnl_mutex){+.+.}-{3:3}, at: smc_pnet_create_pnetids_list net/smc/smc_pnet.c:809 [inline]\\n  #1: ffffffff8f375b88 (rtnl_mutex){+.+.}-{3:3}, at: smc_pnet_net_init+0x10a/0x1e0 net/smc/smc_pnet.c:878\\n2 locks held by syz-executor.3/12268:\\n  #0: ffffffff8f369610 (pernet_ops_rwsem){++++}-{3:3}, at: copy_net_ns+0x4c7/0x7b0 net/core/net_namespace.c:491\\n  #1: ffffffff8f375b88 (rtnl_mutex){+.+.}-{3:3}, at: smc_pnet_create_pnetids_list net/smc/smc_pnet.c:809 [inline]\\n  #1: ffffffff8f375b88 (rtnl_mutex){+.+.}-{3:3}, at: smc_pnet_net_init+0x10a/0x1e0 net/smc/smc_pnet.c:878\\n2 locks held by syz-executor.4/12271:\\n  #0: ffffffff8f369610 (pernet_ops_rwsem){++++}-{3:3}, at: copy_net_ns+0x4c7/0x7b0 net/core/net_namespace.c:491\\n  #1: ffffffff8f375b88 (rtnl_mutex){+.+.}-{3:3}, at: smc_pnet_create_pnetids_list net/smc/smc_pnet.c:809 [inline]\\n  #1: ffffffff8f375b88 (rtnl_mutex){+.+.}-{3:3}, at: smc_pnet_net_init+0x10a/0x1e0 net/smc/smc_pnet.c:878\\n2 locks held by syz-executor.1/12274:\\n  #0: ffffffff8f369610 (pernet_ops_rwsem){++++}-{3:3}, at: copy_net_ns+0x4c7/0x7b0 net/core/net_namespace.c:491\\n  #1: ffffffff8f375b88 (rtnl_mutex){+.+.}-{3:3}, at: smc_pnet_create_pnetids_list net/smc/smc_pnet.c:809 [inline]\\n  #1: ffffffff8f375b88 (rtnl_mutex){+.+.}-{3:3}, at: smc_pnet_net_init+0x10a/0x1e0 net/smc/smc_pnet.c:878\\n2 locks held by syz-executor.2/12280:\\n  #0: ffffffff8f369610 (pernet_ops_rwsem){++++}-{3:3}, at: copy_net_ns+0x4c7/0x7b0 net/core/net_namespace.c:491\\n  #1: ffffffff8f375b88 (rtnl_mutex){+.+.}-{3:3}, at: smc_pnet_create_pnetids_list net/smc/smc_pnet.c:809 [inline]\\n  #1: ffffffff8f375b88 (rtnl_mutex){+.+.}-{3:3}, at: smc_pnet_net_init+0x10a/0x1e0 net/smc/smc_pnet.c:878\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: net/smc: reduce la presi\u00f3n rtnl en smc_pnet_create_pnetids_list() Muchos informes de syzbot muestran una presi\u00f3n rtnl extrema, y muchos de ellos insin\u00faan que smc adquiere rtnl en la creaci\u00f3n de netns sin una buena raz\u00f3n [1] Este parche regresa temprano desde smc_pnet_net_init() si a\u00fan no hay un netdevice. Ni siquiera estoy seguro de por qu\u00e9 existe smc_pnet_create_pnetids_list(), porque smc_pnet_netdev_event() tambi\u00e9n llama a smc_pnet_add_base_pnetid() cuando maneja el evento NETDEV_UP. [1] extracto de informes t\u00edpicos de syzbot 2 bloqueos mantenidos por syz-executor.3/12252: #0: ffffffff8f369610 (pernet_ops_rwsem){++++}-{3:3}, en: copy_net_ns+0x4c7/0x7b0 net/core /net_namespace.c:491 #1: ffffffff8f375b88 (rtnl_mutex){+.+.}-{3:3}, en: smc_pnet_create_pnetids_list net/smc/smc_pnet.c:809 [en l\u00ednea] #1: ffffffff8f375b88 (rtnl_mutex){+ .+.}-{3:3}, en: smc_pnet_net_init+0x10a/0x1e0 net/smc/smc_pnet.c:878 2 bloqueos retenidos por syz-executor.4/12253: #0: ffffffff8f369610 (pernet_ops_rwsem){+++ +}-{3:3}, en: copy_net_ns+0x4c7/0x7b0 net/core/net_namespace.c:491 #1: ffffffff8f375b88 (rtnl_mutex){+.+.}-{3:3}, en: smc_pnet_create_pnetids_list net/ smc/smc_pnet.c:809 [en l\u00ednea] #1: ffffffff8f375b88 (rtnl_mutex){+.+.}-{3:3}, en: smc_pnet_net_init+0x10a/0x1e0 net/smc/smc_pnet.c:878 2 bloqueos retenidos por syz-executor.1/12257: #0: ffffffff8f369610 (pernet_ops_rwsem){++++}-{3:3}, en: copy_net_ns+0x4c7/0x7b0 net/core/net_namespace.c:491 #1: ffffffff8f375b88 (rtnl_mutex ){+.+.}-{3:3}, en: smc_pnet_create_pnetids_list net/smc/smc_pnet.c:809 [en l\u00ednea] #1: ffffffff8f375b88 (rtnl_mutex){+.+.}-{3:3}, en : smc_pnet_net_init+0x10a/0x1e0 net/smc/smc_pnet.c:878 2 bloqueos retenidos por syz-executor.2/12261: #0: ffffffff8f369610 (pernet_ops_rwsem){++++}-{3:3}, en: copy_net_ns +0x4c7/0x7b0 net/core/net_namespace.c:491 #1: ffffffff8f375b88 (rtnl_mutex){+.+.}-{3:3}, en: smc_pnet_create_pnetids_list net/smc/smc_pnet.c:809 [en l\u00ednea] #1 : ffffffff8f375b88 (rtnl_mutex){+.+.}-{3:3}, en: smc_pnet_net_init+0x10a/0x1e0 net/smc/smc_pnet.c:878 2 bloqueos retenidos por syz-executor.0/12265: #0: ffffffff8f369610 (pernet_ops_rwsem){++++}-{3:3}, en: copy_net_ns+0x4c7/0x7b0 net/core/net_namespace.c:491 #1: ffffffff8f375b88 (rtnl_mutex){+.+.}-{3:3 }, en: smc_pnet_create_pnetids_list net/smc/smc_pnet.c:809 [en l\u00ednea] #1: ffffffff8f375b88 (rtnl_mutex){+.+.}-{3:3}, en: smc_pnet_net_init+0x10a/0x1e0 net/smc/smc_pnet. c:878 2 bloqueos retenidos por syz-executor.3/12268: #0: ffffffff8f369610 (pernet_ops_rwsem){++++}-{3:3}, en: copy_net_ns+0x4c7/0x7b0 net/core/net_namespace.c: 491 #1: ffffffff8f375b88 (rtnl_mutex){+.+.}-{3:3}, en: smc_pnet_create_pnetids_list net/smc/smc_pnet.c:809 [en l\u00ednea] #1: ffffffff8f375b88 (rtnl_mutex){+.+.}- {3:3}, en: smc_pnet_net_init+0x10a/0x1e0 net/smc/smc_pnet.c:878 2 bloqueos retenidos por syz-executor.4/12271: #0: ffffffff8f369610 (pernet_ops_rwsem){++++}-{3 :3}, en: copy_net_ns+0x4c7/0x7b0 net/core/net_namespace.c:491 #1: ffffffff8f375b88 (rtnl_mutex){+.+.}-{3:3}, en: smc_pnet_create_pnetids_list net/smc/smc_pnet.c :809 [en l\u00ednea] #1: ffffffff8f375b88 (rtnl_mutex){+.+.}-{3:3}, en: smc_pnet_net_init+0x10a/0x1e0 net/smc/smc_pnet.c:878 2 bloqueos retenidos por syz-executor.1 /12274: #0: ffffffff8f369610 (pernet_ops_rwsem){++++}-{3:3}, en: copy_net_ns+0x4c7/0x7b0 net/core/net_namespace.c:491 #1: ffffffff8f375b88 (rtnl_mutex){+.+ .}-{3:3}, en: smc_pnet_create_pnetids_list net/smc/smc_pnet.c:809 [en l\u00ednea] #1: ffffffff8f375b88 (rtnl_mutex){+.+.}-{3:3}, en: smc_pnet_net_init+0x10a/ 0x1e0 net/smc/smc_pnet.c:878 2 bloqueos retenidos por syz-executor.2/12280: #0: ffffffff8f369610 (pernet_ops_rwsem){++++}-{3:3}, en: copy_net_ns+0x4c7/0x7b0 net /core/net_namespace.c:491 #1: ffffffff8f375b88 (rtnl_mutex){+.+.}-{3:3}, en: smc_pnet_create_pnetids_list net/smc/smc_pnet.c:809 [en l\u00ednea] #1: ffffffff8f375b88 (rtnl_mutex) {+.+.}-{3:3}, en: smc_pnet_net_init+0x10a/0x1e0 net/smc/smc_pnet.c:878\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/00af2aa93b76b1bade471ad0d0525d4d29ca5cc0\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/6e920422e7104928f760fc0e12b6d65ab097a2e7\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/a2e6bffc0388526ed10406040279a693d62b36ec\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/b9117dc783c0ab0a3866812f70e07bf2ea071ac4\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/bc4d1ebca11b4f194e262326bd45938e857c59d2\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/d7ee3bf0caf599c14db0bf4af7aacd6206ef8a23\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://lists.debian.org/debian-lts-announce/2024/06/msg00017.html\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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