CVE-2024-49985: i2c: stm32f7: Do not prepare/unprepare clock during runtime suspend/resume
First published: Mon Oct 21 2024(Updated: )
In the Linux kernel, the following vulnerability has been resolved: i2c: stm32f7: Do not prepare/unprepare clock during runtime suspend/resume In case there is any sort of clock controller attached to this I2C bus controller, for example Versaclock or even an AIC32x4 I2C codec, then an I2C transfer triggered from the clock controller clk_ops .prepare callback may trigger a deadlock on drivers/clk/clk.c prepare_lock mutex. This is because the clock controller first grabs the prepare_lock mutex and then performs the prepare operation, including its I2C access. The I2C access resumes this I2C bus controller via .runtime_resume callback, which calls clk_prepare_enable(), which attempts to grab the prepare_lock mutex again and deadlocks. Since the clock are already prepared since probe() and unprepared in remove(), use simple clk_enable()/clk_disable() calls to enable and disable the clock on runtime suspend and resume, to avoid hitting the prepare_lock mutex.
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux Kernel | >=5.0<5.10.227 | |
| Linux Kernel | >=5.11<5.15.168 | |
| Linux Kernel | >=5.16<6.1.113 | |
| Linux Kernel | >=6.2<6.6.55 | |
| Linux Kernel | >=6.7<6.10.14 | |
| Linux Kernel | >=6.11<6.11.3 | |
| Linux Kernel | =6.12-rc1 | |
| debian/linux | <=5.10.223-1<=5.10.226-1 | 6.1.123-1 6.1.128-1 6.12.12-1 6.12.15-1 |
| debian/linux-6.1 | 6.1.119-1~deb11u1 |
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Reference Links
- https://git.kernel.org/stable/c/048bbbdbf85e5e00258dfb12f5e368f908801d7b
- https://git.kernel.org/stable/c/1883cad2cc629ded4a3556c0bbb8b42533ad8764
- https://git.kernel.org/stable/c/22a1f8a5b56ba93d3e8b7a1dafa24e01c8bb48ba
- https://git.kernel.org/stable/c/894cd5f5fd9061983445bbd1fa3d81be43095344
- https://git.kernel.org/stable/c/9b8bc33ad64192f54142396470cc34ce539a8940
- https://git.kernel.org/stable/c/c2024b1a583ab9176c797ea1e5f57baf8d5e2682
- https://git.kernel.org/stable/c/d6f1250a4d5773f447740b9fe37b8692105796d4
- https://git.kernel.org/stable/c/fac3c9f7784e8184c0338e9f0877b81e55d3ef1c
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-49985
- https://nvd.nist.gov/vuln/detail/CVE-2024-49985
- https://launchpad.net/bugs/cve/CVE-2024-49985
- https://security-tracker.debian.org/tracker/CVE-2024-49985
- https://ubuntu.com/security/CVE-2024-49985
- https://git.kernel.org/linus/048bbbdbf85e5e00258dfb12f5e368f908801d7b
Frequently Asked Questions
What is the severity of CVE-2024-49985?
The severity of CVE-2024-49985 has not been explicitly classified, but it pertains to a vulnerability in the Linux kernel related to I2C bus controllers.
How do I fix CVE-2024-49985?
To fix CVE-2024-49985, update to a patched version of the Linux kernel, such as 6.1.123-1 or other specified remedies in the vulnerability report.
Which Linux kernel versions are affected by CVE-2024-49985?
CVE-2024-49985 affects Linux kernel versions between 5.0 and 6.12-rc1, specifically in ranges up to 5.15.168 and 6.6.55.
Is CVE-2024-49985 related to clock controllers?
Yes, CVE-2024-49985 involves an issue where clock preparation and unpreparation may affect I2C bus controllers connected to certain clock controllers.
What could be a potential impact of CVE-2024-49985?
Potential impacts of CVE-2024-49985 may include system instability or unexpected behavior in devices utilizing I2C bus communication during runtime suspend/resume.
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