| 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-2022-49313: drivers: usb: host: Fix deadlock in oxu_bus_suspend() |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| drivers: usb: host: Fix deadlock in oxu_bus_suspend() |
| |
| There is a deadlock in oxu_bus_suspend(), which is shown below: |
| |
| (Thread 1) | (Thread 2) |
| | timer_action() |
| oxu_bus_suspend() | mod_timer() |
| spin_lock_irq() //(1) | (wait a time) |
| ... | oxu_watchdog() |
| del_timer_sync() | spin_lock_irq() //(2) |
| (wait timer to stop) | ... |
| |
| We hold oxu->lock in position (1) of thread 1, and use |
| del_timer_sync() to wait timer to stop, but timer handler |
| also need oxu->lock in position (2) of thread 2. As a result, |
| oxu_bus_suspend() will block forever. |
| |
| This patch extracts del_timer_sync() from the protection of |
| spin_lock_irq(), which could let timer handler to obtain |
| the needed lock. |
| |
| The Linux kernel CVE team has assigned CVE-2022-49313 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Fixed in 4.9.318 with commit 9b58d255f27b0ed6a2e43208960864d67579db58 |
| Fixed in 4.14.283 with commit a3d380188bde8900c3f604e82b56572896499124 |
| Fixed in 4.19.247 with commit f8242044c91cafbba9e320b0fb31abf2429a3221 |
| Fixed in 5.4.198 with commit 2dcec0bc142be2096af71a5703d63237127db204 |
| Fixed in 5.10.122 with commit ffe9440d698274c6462d2e304562c6ddfc8c84df |
| Fixed in 5.15.47 with commit d888753872190abd18f68a7d77b9c7c367f0a7ab |
| Fixed in 5.17.15 with commit 4187b291a76664a3c03d3f0d9bfadc8322881868 |
| Fixed in 5.18.4 with commit b97aae8b43b718314012e8170b7e03dbfd2e7677 |
| Fixed in 5.19 with commit 4d378f2ae58138d4c55684e1d274e7dd94aa6524 |
| |
| 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-2022-49313 |
| 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/usb/host/oxu210hp-hcd.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/9b58d255f27b0ed6a2e43208960864d67579db58 |
| https://git.kernel.org/stable/c/a3d380188bde8900c3f604e82b56572896499124 |
| https://git.kernel.org/stable/c/f8242044c91cafbba9e320b0fb31abf2429a3221 |
| https://git.kernel.org/stable/c/2dcec0bc142be2096af71a5703d63237127db204 |
| https://git.kernel.org/stable/c/ffe9440d698274c6462d2e304562c6ddfc8c84df |
| https://git.kernel.org/stable/c/d888753872190abd18f68a7d77b9c7c367f0a7ab |
| https://git.kernel.org/stable/c/4187b291a76664a3c03d3f0d9bfadc8322881868 |
| https://git.kernel.org/stable/c/b97aae8b43b718314012e8170b7e03dbfd2e7677 |
| https://git.kernel.org/stable/c/4d378f2ae58138d4c55684e1d274e7dd94aa6524 |
