CVE-2024-27002
Assigner: Linux
Published: 2024-05-01T05:28:44.902Z
State: PUBLISHED
descriptions: value: In the Linux kernel, the following vulnerability has been resolved:

clk: mediatek: Do a runtime PM get on controllers during probe

mt8183-mfgcfg has a mutual dependency with genpd during the probing
stage, which leads to a deadlock in the following call stack:

CPU0:  genpd_lock --> clk_prepare_lock
genpd_power_off_work_fn()
 genpd_lock()
 generic_pm_domain::power_off()
    clk_unprepare()
      clk_prepare_lock()

CPU1: clk_prepare_lock --> genpd_lock
clk_register()
  __clk_core_init()
    clk_prepare_lock()
    clk_pm_runtime_get()
      genpd_lock()

Do a runtime PM get at the probe function to make sure clk_register()
won't acquire the genpd lock. Instead of only modifying mt8183-mfgcfg,
do this on all mediatek clock controller probings because we don't
believe this would cause any regression.

Verified on MT8183 and MT8192 Chromebooks.
affected: product: Linux
vendor: Linux
defaultStatus: unaffected
repo: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
versions: version: acddfc2c261b
lessThan: 165d22647257
status: affected
versionType: git
version: acddfc2c261b
lessThan: c0dcd5c072e2
status: affected
versionType: git
version: acddfc2c261b
lessThan: b62ed25feb34
status: affected
versionType: git
version: acddfc2c261b
lessThan: 2f7b1d8b5505
status: affected
versionType: git
product: Linux
vendor: Linux
defaultStatus: affected
repo: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
versions: version: 5.2
status: affected
version: 0
lessThan: 5.2
status: unaffected
versionType: custom
version: 6.1.88
lessThanOrEqual: 6.1.*
status: unaffected
versionType: custom
version: 6.6.29
lessThanOrEqual: 6.6.*
status: unaffected
versionType: custom
version: 6.8.8
lessThanOrEqual: 6.8.*
status: unaffected
versionType: custom
version: 6.9
lessThanOrEqual: *
status: unaffected
versionType: original_commit_for_fix
title: clk: mediatek: Do a runtime PM get on controllers during probe
x_generator: engine: bippy-d175d3acf727