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net/smc: reduce rtnl pressure in smc_pnet_create_pnetids_list()

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: net/smc: reduce rtnl pressure in smc_pnet_create_pnetids_list() Many syzbot reports show extreme rtnl pressure, and many of them hint that smc acquires rtnl in netns creation for no good reason [1] This patch returns early from smc_pnet_net_init() if there is no netdevice yet. I am not even sure why smc_pnet_create_pnetids_list() even exists, because smc_pnet_netdev_event() is also calling smc_pnet_add_base_pnetid() when handling NETDEV_UP event. [1] extract of typical syzbot reports 2 locks held by syz-executor.3/12252: #0: ffffffff8f369610 (pernet_ops_rwsem){++++}-{3:3}, at: copy_net_ns+0x4c7/0x7b0 net/core/net_namespace.c:491 #1: ffffffff8f375b88 (rtnl_mutex){+.+.}-{3:3}, at: smc_pnet_create_pnetids_list net/smc/smc_pnet.c:809 [inline] #1: ffffffff8f375b88 (rtnl_mutex){+.+.}-{3:3}, at: smc_pnet_net_init+0x10a/0x1e0 net/smc/smc_pnet.c:878 2 locks held by syz-executor.4/12253: #0: ffffffff8f369610 (pernet_ops_rwsem){++++}-{3:3}, at: copy_net_ns+0x4c7/0x7b0 net/core/net_namespace.c:491 #1: ffffffff8f375b88 (rtnl_mutex){+.+.}-{3:3}, at: smc_pnet_create_pnetids_list net/smc/smc_pnet.c:809 [inline] #1: ffffffff8f375b88 (rtnl_mutex){+.+.}-{3:3}, at: smc_pnet_net_init+0x10a/0x1e0 net/smc/smc_pnet.c:878 2 locks held by syz-executor.1/12257: #0: ffffffff8f369610 (pernet_ops_rwsem){++++}-{3:3}, at: copy_net_ns+0x4c7/0x7b0 net/core/net_namespace.c:491 #1: ffffffff8f375b88 (rtnl_mutex){+.+.}-{3:3}, at: smc_pnet_create_

Announced Source revision 1
Original source ↗

CVE-2024-35934

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2024-35934

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "e888a2e8337c96dd785d204cf8ff775e79173add",
        "lessThan": "bc4d1ebca11b4f194e262326bd45938e857c59d2",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "e888a2e8337c96dd785d204cf8ff775e79173add",
        "lessThan": "b9117dc783c0ab0a3866812f70e07bf2ea071ac4",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "e888a2e8337c96dd785d204cf8ff775e79173add",
        "lessThan": "d7ee3bf0caf599c14db0bf4af7aacd6206ef8a23",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "e888a2e8337c96dd785d204cf8ff775e79173add",
        "lessThan": "a2e6bffc0388526ed10406040279a693d62b36ec",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "e888a2e8337c96dd785d204cf8ff775e79173add",
        "lessThan": "6e920422e7104928f760fc0e12b6d65ab097a2e7",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "e888a2e8337c96dd785d204cf8ff775e79173add",
        "lessThan": "00af2aa93b76b1bade471ad0d0525d4d29ca5cc0",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "net/smc/smc_pnet.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "5.10"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "5.10",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.10.215",
        "versionType": "semver",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.155",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.86",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.27",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.8.6",
        "versionType": "semver",
        "lessThanOrEqual": "6.8.*"
      },
      {
        "status": "unaffected",
        "version": "6.9",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "net/smc/smc_pnet.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2024-35934

Source reference: /cveMetadata/cveId

Publisher severity

No explicit severity was provided.

Event
#26549 · Revision 1
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Publisher date
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