github - ghsa-7wxc-v995-9mmf

ghsa-7wxc-v995-9mmf

Vulnerability from github

Published

2024-05-21 15:31

Modified

2024-05-21 15:31

Details

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

x86/entry: Clear X86_FEATURE_SMAP when CONFIG_X86_SMAP=n

Commit

3c73b81a9164 ("x86/entry, selftests: Further improve user entry sanity checks")

added a warning if AC is set when in the kernel.

Commit

662a0221893a3d ("x86/entry: Fix AC assertion")

changed the warning to only fire if the CPU supports SMAP.

However, the warning can still trigger on a machine that supports SMAP but where it's disabled in the kernel config and when running the syscall_nt selftest, for example:

------------[ cut here ]------------ WARNING: CPU: 0 PID: 49 at irqentry_enter_from_user_mode CPU: 0 PID: 49 Comm: init Tainted: G T 5.15.0-rc4+ #98 e6202628ee053b4f310759978284bd8bb0ce6905 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.10.2-1ubuntu1 04/01/2014 RIP: 0010:irqentry_enter_from_user_mode ... Call Trace: ? irqentry_enter ? exc_general_protection ? asm_exc_general_protection ? asm_exc_general_protectio

IS_ENABLED(CONFIG_X86_SMAP) could be added to the warning condition, but even this would not be enough in case SMAP is disabled at boot time with the "nosmap" parameter.

To be consistent with "nosmap" behaviour, clear X86_FEATURE_SMAP when !CONFIG_X86_SMAP.

Found using entry-fuzz + satrandconfig.

[ bp: Massage commit message. ]

Show details on source website

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{
  "affected": [],
  "aliases": [
    "CVE-2021-47430"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2024-05-21T15:15:28Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nx86/entry: Clear X86_FEATURE_SMAP when CONFIG_X86_SMAP=n\n\nCommit\n\n  3c73b81a9164 (\"x86/entry, selftests: Further improve user entry sanity checks\")\n\nadded a warning if AC is set when in the kernel.\n\nCommit\n\n  662a0221893a3d (\"x86/entry: Fix AC assertion\")\n\nchanged the warning to only fire if the CPU supports SMAP.\n\nHowever, the warning can still trigger on a machine that supports SMAP\nbut where it\u0027s disabled in the kernel config and when running the\nsyscall_nt selftest, for example:\n\n  ------------[ cut here ]------------\n  WARNING: CPU: 0 PID: 49 at irqentry_enter_from_user_mode\n  CPU: 0 PID: 49 Comm: init Tainted: G                T 5.15.0-rc4+ #98 e6202628ee053b4f310759978284bd8bb0ce6905\n  Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.10.2-1ubuntu1 04/01/2014\n  RIP: 0010:irqentry_enter_from_user_mode\n  ...\n  Call Trace:\n   ? irqentry_enter\n   ? exc_general_protection\n   ? asm_exc_general_protection\n   ? asm_exc_general_protectio\n\nIS_ENABLED(CONFIG_X86_SMAP) could be added to the warning condition, but\neven this would not be enough in case SMAP is disabled at boot time with\nthe \"nosmap\" parameter.\n\nTo be consistent with \"nosmap\" behaviour, clear X86_FEATURE_SMAP when\n!CONFIG_X86_SMAP.\n\nFound using entry-fuzz + satrandconfig.\n\n [ bp: Massage commit message. ]",
  "id": "GHSA-7wxc-v995-9mmf",
  "modified": "2024-05-21T15:31:45Z",
  "published": "2024-05-21T15:31:45Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-47430"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3958b9c34c2729597e182cc606cc43942fd19f7c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4e9ec1c65da98c293f75d83755dfa5e03075a6d0"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f2447f6587b8ffe42ba04d14ce67d429a1163e5e"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

cve-2021-47430

Vulnerability from cvelistv5

Published

2024-05-21 15:04

Modified

2024-12-19 07:41

Severity ?

Summary

In the Linux kernel, the following vulnerability has been resolved: x86/entry: Clear X86_FEATURE_SMAP when CONFIG_X86_SMAP=n Commit 3c73b81a9164 ("x86/entry, selftests: Further improve user entry sanity checks") added a warning if AC is set when in the kernel. Commit 662a0221893a3d ("x86/entry: Fix AC assertion") changed the warning to only fire if the CPU supports SMAP. However, the warning can still trigger on a machine that supports SMAP but where it's disabled in the kernel config and when running the syscall_nt selftest, for example: ------------[ cut here ]------------ WARNING: CPU: 0 PID: 49 at irqentry_enter_from_user_mode CPU: 0 PID: 49 Comm: init Tainted: G T 5.15.0-rc4+ #98 e6202628ee053b4f310759978284bd8bb0ce6905 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.10.2-1ubuntu1 04/01/2014 RIP: 0010:irqentry_enter_from_user_mode ... Call Trace: ? irqentry_enter ? exc_general_protection ? asm_exc_general_protection ? asm_exc_general_protectio IS_ENABLED(CONFIG_X86_SMAP) could be added to the warning condition, but even this would not be enough in case SMAP is disabled at boot time with the "nosmap" parameter. To be consistent with "nosmap" behaviour, clear X86_FEATURE_SMAP when !CONFIG_X86_SMAP. Found using entry-fuzz + satrandconfig. [ bp: Massage commit message. ]

References

▼	URL	Tags
	https://git.kernel.org/stable/c/f2447f6587b8ffe42ba04d14ce67d429a1163e5e
	https://git.kernel.org/stable/c/4e9ec1c65da98c293f75d83755dfa5e03075a6d0
	https://git.kernel.org/stable/c/3958b9c34c2729597e182cc606cc43942fd19f7c

Impacted products

Vendor

Product

Version

▼

Linux

Version: 3c73b81a9164d0c1b6379d6672d2772a9e95168e
Version: 3c73b81a9164d0c1b6379d6672d2772a9e95168e
Version: 3c73b81a9164d0c1b6379d6672d2772a9e95168e

Linux

Version: 5.8

Show details on NVD website

JSON

To clipboard

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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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