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s390: fix double free of GS and RI CBs on fork() failure

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: s390: fix double free of GS and RI CBs on fork() failure The pointers for guarded storage and runtime instrumentation control blocks are stored in the thread_struct of the associated task. These pointers are initially copied on fork() via arch_dup_task_struct() and then cleared via copy_thread() before fork() returns. If fork() happens to fail after the initial task dup and before copy_thread(), the newly allocated task and associated thread_struct memory are freed via free_task() -> arch_release_task_struct(). This results in a double free of the guarded storage and runtime info structs because the fields in the failed task still refer to memory associated with the source task. This problem can manifest as a BUG_ON() in set_freepointer() (with CONFIG_SLAB_FREELIST_HARDENED enabled) or KASAN splat (if enabled) when running trinity syscall fuzz tests on s390x. To avoid this problem, clear the associated pointer fields in arch_dup_task_struct() immediately after the new task is copied. Note that the RI flag is still cleared in copy_thread() because it resides in thread stack memory and that is where stack info is copied.

Announced Group revision 1
Original source ↗

CVE-2022-49990

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-2022-49990

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": "8d9047f8b967ce6181fd824ae922978e1b055cc0",
        "lessThan": "25a95303b9e513cd2978aacc385d06e6fec23d07",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "8d9047f8b967ce6181fd824ae922978e1b055cc0",
        "lessThan": "cacd522e6652fbc2dc0cc6ae11c4e30782fef14b",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "8d9047f8b967ce6181fd824ae922978e1b055cc0",
        "lessThan": "297ae7e87a87a001dd3dfeac1cb26a42fd929708",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "8d9047f8b967ce6181fd824ae922978e1b055cc0",
        "lessThan": "8195e065abf3df84eb0ad2987e76a40f21d1791c",
        "versionType": "git"
      },
      {
        "status": "affected",
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        "lessThan": "fbdc482d43eda40a70de4b0155843d5472f6de62",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "8d9047f8b967ce6181fd824ae922978e1b055cc0",
        "lessThan": "13cccafe0edcd03bf1c841de8ab8a1c8e34f77d9",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "9e51ee1b76efc7b5e9404010793a39fde0e03cb7",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "232b47b3c88af1da737cd7760f247c4ed58168cf",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "b8e212c599082896a180a18a0c9bd529526590be",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "4.4.105",
        "lessThan": "4.5",
        "versionType": "semver"
      },
      {
        "status": "affected",
        "version": "4.9.68",
        "lessThan": "4.10",
        "versionType": "semver"
      },
      {
        "status": "affected",
        "version": "4.14.5",
        "lessThan": "4.15",
        "versionType": "semver"
      }
    ],
    "programFiles": [
      "arch/s390/kernel/process.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "4.15"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "4.15",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "4.19.257",
        "versionType": "semver",
        "lessThanOrEqual": "4.19.*"
      },
      {
        "status": "unaffected",
        "version": "5.4.212",
        "versionType": "semver",
        "lessThanOrEqual": "5.4.*"
      },
      {
        "status": "unaffected",
        "version": "5.10.140",
        "versionType": "semver",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.64",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "5.19.6",
        "versionType": "semver",
        "lessThanOrEqual": "5.19.*"
      },
      {
        "status": "unaffected",
        "version": "6.0",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "arch/s390/kernel/process.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2022-49990

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#30199 · Revision 1
Added to Heist Feed
Publisher date
Read the original announcement

Revision history

  1. CVE-2022-49990 · Revision 1Source updated