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Ubuntu: (CVE-2024-35824): linux-raspi-realtime vulnerability

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Ubuntu: (CVE-2024-35824): linux-raspi-realtime vulnerability

Severity
4
CVSS
(AV:L/AC:M/Au:N/C:P/I:P/A:P)
Published
05/17/2024
Created
02/12/2025
Added
02/11/2025
Modified
02/11/2025

Description

In the Linux kernel, the following vulnerability has been resolved: misc: lis3lv02d_i2c: Fix regulators getting en-/dis-abled twice on suspend/resume When not configured for wakeup lis3lv02d_i2c_suspend() will call lis3lv02d_poweroff() even if the device has already been turned off by the runtime-suspend handler and if configured for wakeup and the device is runtime-suspended at this point then it is not turned back on to serve as a wakeup source. Before commit b1b9f7a49440 ("misc: lis3lv02d_i2c: Add missing setting of the reg_ctrl callback"), lis3lv02d_poweroff() failed to disable the regulators which as a side effect made calling poweroff() twice ok. Now that poweroff() correctly disables the regulators, doing this twice triggers a WARN() in the regulator core: unbalanced disables for regulator-dummy WARNING: CPU: 1 PID: 92 at drivers/regulator/core.c:2999 _regulator_disable ... Fix lis3lv02d_i2c_suspend() to not call poweroff() a second time if already runtime-suspended and add a poweron() call when necessary to make wakeup work. lis3lv02d_i2c_resume() has similar issues, with an added weirness that it always powers on the device if it is runtime suspended, after which the first runtime-resume will call poweron() again, causing the enabled count for the regulator to increase by 1 every suspend/resume. These unbalanced regulator_enable() calls cause the regulator to never be turned off and trigger the following WARN() on driver unbind: WARNING: CPU: 1 PID: 1724 at drivers/regulator/core.c:2396 _regulator_put Fix this by making lis3lv02d_i2c_resume() mirror the new suspend().

Solution(s)

  • ubuntu-upgrade-linux-raspi-realtime

References

  • https://attackerkb.com/topics/cve-2024-35824
  • CVE - 2024-35824
  • https://git.kernel.org/linus/ac3e0384073b2408d6cb0d972fee9fcc3776053d
  • https://git.kernel.org/stable/c/4154e767354140db7804207117e7238fb337b0e7
  • https://git.kernel.org/stable/c/997ca415384612c8df76d99d9a768e0b3f42b325
  • https://git.kernel.org/stable/c/ac3e0384073b2408d6cb0d972fee9fcc3776053d
  • https://git.kernel.org/stable/c/f6df761182fc953907b18aba5049fc2a044ecb45
  • https://www.cve.org/CVERecord?id=CVE-2024-35824
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