CVE-2023-52791 i2c: core: Run atomic i2c xfer when !preemptible

2024-05-2115:31:06

Linux

github.com

linux kernel

i2c core

vulnerability

AI Score

6.9

Confidence

Low

EPSS

Percentile

10.3%

SSVC

Exploitation

none

Automatable

Technical Impact

partial

JSON

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

i2c: core: Run atomic i2c xfer when !preemptible

Since bae1d3a05a8b, i2c transfers are non-atomic if preemption is
disabled. However, non-atomic i2c transfers require preemption (e.g. in
wait_for_completion() while waiting for the DMA).

panic() calls preempt_disable_notrace() before calling
emergency_restart(). Therefore, if an i2c device is used for the
restart, the xfer should be atomic. This avoids warnings like:

[ 12.667612] WARNING: CPU: 1 PID: 1 at kernel/rcu/tree_plugin.h:318 rcu_note_context_switch+0x33c/0x6b0
[ 12.676926] Voluntary context switch within RCU read-side critical section!
…
[ 12.742376] schedule_timeout from wait_for_completion_timeout+0x90/0x114
[ 12.749179] wait_for_completion_timeout from tegra_i2c_wait_completion+0x40/0x70
…
[ 12.994527] atomic_notifier_call_chain from machine_restart+0x34/0x58
[ 13.001050] machine_restart from panic+0x2a8/0x32c

Use !preemptible() instead, which is basically the same check as
pre-v5.2.

CNA Affected

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "bae1d3a05a8b",
        "lessThan": "25eb381a736e",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "bae1d3a05a8b",
        "lessThan": "25284c46b657",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "bae1d3a05a8b",
        "lessThan": "f6237afabc34",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "bae1d3a05a8b",
        "lessThan": "185f3617adc8",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "bae1d3a05a8b",
        "lessThan": "8c3fa52a46ff",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "bae1d3a05a8b",
        "lessThan": "3473cf43b906",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "bae1d3a05a8b",
        "lessThan": "aa49c90894d0",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "drivers/i2c/i2c-core.h"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "5.2"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "5.2",
        "versionType": "custom"
      },
      {
        "status": "unaffected",
        "version": "5.4.262",
        "versionType": "custom",
        "lessThanOrEqual": "5.4.*"
      },
      {
        "status": "unaffected",
        "version": "5.10.202",
        "versionType": "custom",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.140",
        "versionType": "custom",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.64",
        "versionType": "custom",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.5.13",
        "versionType": "custom",
        "lessThanOrEqual": "6.5.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.3",
        "versionType": "custom",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.7",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "drivers/i2c/i2c-core.h"
    ],
    "defaultStatus": "affected"
  }
]