| From bippy-5f407fcff5a0 Mon Sep 17 00:00:00 2001 |
| From: Greg Kroah-Hartman <gregkh@linuxfoundation.org> |
| To: <linux-cve-announce@vger.kernel.org> |
| Reply-to: <cve@kernel.org>, <linux-kernel@vger.kernel.org> |
| Subject: CVE-2024-27002: clk: mediatek: Do a runtime PM get on controllers during probe |
| |
| Description |
| =========== |
| |
| 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. |
| |
| The Linux kernel CVE team has assigned CVE-2024-27002 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 5.2 with commit acddfc2c261b3653ab1c1b567a427299bac20d31 and fixed in 6.1.88 with commit 165d226472575b213dd90dfda19d1605dd7c19a8 |
| Issue introduced in 5.2 with commit acddfc2c261b3653ab1c1b567a427299bac20d31 and fixed in 6.6.29 with commit c0dcd5c072e2a3fff886f673e6a5d9bf8090c4cc |
| Issue introduced in 5.2 with commit acddfc2c261b3653ab1c1b567a427299bac20d31 and fixed in 6.8.8 with commit b62ed25feb342eab052822eff0c554873799a4f5 |
| Issue introduced in 5.2 with commit acddfc2c261b3653ab1c1b567a427299bac20d31 and fixed in 6.9 with commit 2f7b1d8b5505efb0057cd1ab85fca206063ea4c3 |
| |
| Please see https://www.kernel.org for a full list of currently supported |
| kernel versions by the kernel community. |
| |
| Unaffected versions might change over time as fixes are backported to |
| older supported kernel versions. The official CVE entry at |
| https://cve.org/CVERecord/?id=CVE-2024-27002 |
| will be updated if fixes are backported, please check that for the most |
| up to date information about this issue. |
| |
| |
| Affected files |
| ============== |
| |
| The file(s) affected by this issue are: |
| drivers/clk/mediatek/clk-mtk.c |
| |
| |
| Mitigation |
| ========== |
| |
| The Linux kernel CVE team recommends that you update to the latest |
| stable kernel version for this, and many other bugfixes. Individual |
| changes are never tested alone, but rather are part of a larger kernel |
| release. Cherry-picking individual commits is not recommended or |
| supported by the Linux kernel community at all. If however, updating to |
| the latest release is impossible, the individual changes to resolve this |
| issue can be found at these commits: |
| https://git.kernel.org/stable/c/165d226472575b213dd90dfda19d1605dd7c19a8 |
| https://git.kernel.org/stable/c/c0dcd5c072e2a3fff886f673e6a5d9bf8090c4cc |
| https://git.kernel.org/stable/c/b62ed25feb342eab052822eff0c554873799a4f5 |
| https://git.kernel.org/stable/c/2f7b1d8b5505efb0057cd1ab85fca206063ea4c3 |
