github - ghsa-9pvc-v9gg-mq34

ghsa-9pvc-v9gg-mq34

Vulnerability from github

Published

2024-07-16 12:30

Modified

2024-07-16 12:30

Details

In the Linux kernel, the following vulnerability has been resolved:

tcp: take care of mixed splice()/sendmsg(MSG_ZEROCOPY) case

syzbot found that mixing sendpage() and sendmsg(MSG_ZEROCOPY) calls over the same TCP socket would again trigger the infamous warning in inet_sock_destruct()

WARN_ON(sk_forward_alloc_get(sk));

While Talal took into account a mix of regular copied data and MSG_ZEROCOPY one in the same skb, the sendpage() path has been forgotten.

We want the charging to happen for sendpage(), because pages could be coming from a pipe. What is missing is the downgrading of pure zerocopy status to make sure sk_forward_alloc will stay synced.

Add tcp_downgrade_zcopy_pure() helper so that we can use it from the two callers.

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{
  "affected": [],
  "aliases": [
    "CVE-2022-48819"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2024-07-16T12:15:05Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ntcp: take care of mixed splice()/sendmsg(MSG_ZEROCOPY) case\n\nsyzbot found that mixing sendpage() and sendmsg(MSG_ZEROCOPY)\ncalls over the same TCP socket would again trigger the\ninfamous warning in inet_sock_destruct()\n\n\tWARN_ON(sk_forward_alloc_get(sk));\n\nWhile Talal took into account a mix of regular copied data\nand MSG_ZEROCOPY one in the same skb, the sendpage() path\nhas been forgotten.\n\nWe want the charging to happen for sendpage(), because\npages could be coming from a pipe. What is missing is the\ndowngrading of pure zerocopy status to make sure\nsk_forward_alloc will stay synced.\n\nAdd tcp_downgrade_zcopy_pure() helper so that we can\nuse it from the two callers.",
  "id": "GHSA-9pvc-v9gg-mq34",
  "modified": "2024-07-16T12:30:40Z",
  "published": "2024-07-16T12:30:40Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2022-48819"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/47f3860c4931175f112f28dcac66eacca9b1040f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f8d9d938514f46c4892aff6bfe32f425e84d81cc"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

cve-2022-48819

Vulnerability from cvelistv5

Published

2024-07-16 11:44

Modified

2024-11-04 12:17

Severity ?

Summary

tcp: take care of mixed splice()/sendmsg(MSG_ZEROCOPY) case

References

▼	URL	Tags
	https://git.kernel.org/stable/c/47f3860c4931175f112f28dcac66eacca9b1040f
	https://git.kernel.org/stable/c/f8d9d938514f46c4892aff6bfe32f425e84d81cc

Impacted products

Vendor

Product

Version

▼

Linux

Version: 9b65b17db723
Version: 9b65b17db723

Linux

Version: 5.16

Show details on NVD website

JSON

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Sightings

Author	Source	Type	Date

Nomenclature

Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
Confirmed: The vulnerability is confirmed from an analyst perspective.
Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
Patched: This vulnerability was successfully patched by the user reporting the sighting.
Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
Not confirmed: The user expresses doubt about the veracity of the vulnerability.
Not patched: This vulnerability was not successfully patched by the user reporting the sighting.

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