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bpf: Defer the free of inner map when necessary

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: bpf: Defer the free of inner map when necessary When updating or deleting an inner map in map array or map htab, the map may still be accessed by non-sleepable program or sleepable program. However bpf_map_fd_put_ptr() decreases the ref-counter of the inner map directly through bpf_map_put(), if the ref-counter is the last one (which is true for most cases), the inner map will be freed by ops->map_free() in a kworker. But for now, most .map_free() callbacks don't use synchronize_rcu() or its variants to wait for the elapse of a RCU grace period, so after the invocation of ops->map_free completes, the bpf program which is accessing the inner map may incur use-after-free problem. Fix the free of inner map by invoking bpf_map_free_deferred() after both one RCU grace period and one tasks trace RCU grace period if the inner map has been removed from the outer map before. The deferment is accomplished by using call_rcu() or call_rcu_tasks_trace() when releasing the last ref-counter of bpf map. The newly-added rcu_head field in bpf_map shares the same storage space with work field to reduce the size of bpf_map.

Announced Source revision 1
Original source ↗

CVE-2023-52447

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-2023-52447

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": "bba1dc0b55ac462d24ed1228ad49800c238cd6d7",
        "lessThan": "90c445799fd1dc214d7c6279c144e33a35e29ef2",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "bba1dc0b55ac462d24ed1228ad49800c238cd6d7",
        "lessThan": "37d98fb9c3144c0fddf7f6e99aece9927ac8dce6",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "bba1dc0b55ac462d24ed1228ad49800c238cd6d7",
        "lessThan": "62fca83303d608ad4fec3f7428c8685680bb01b0",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "bba1dc0b55ac462d24ed1228ad49800c238cd6d7",
        "lessThan": "f91cd728b10c51f6d4a39957ccd56d1e802fc8ee",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "bba1dc0b55ac462d24ed1228ad49800c238cd6d7",
        "lessThan": "bfd9b20c4862f41d4590fde11d70a5eeae53dcc5",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "bba1dc0b55ac462d24ed1228ad49800c238cd6d7",
        "lessThan": "876673364161da50eed6b472d746ef88242b2368",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "include/linux/bpf.h",
      "kernel/bpf/map_in_map.c",
      "kernel/bpf/syscall.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "5.9"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "5.9",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.10.214",
        "versionType": "semver",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.153",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.75",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.14",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.7.2",
        "versionType": "semver",
        "lessThanOrEqual": "6.7.*"
      },
      {
        "status": "unaffected",
        "version": "6.8",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "include/linux/bpf.h",
      "kernel/bpf/map_in_map.c",
      "kernel/bpf/syscall.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2023-52447

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#26378 · Revision 1
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Publisher date
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