| 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-2022-49379: driver core: Fix wait_for_device_probe() & deferred_probe_timeout interaction |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| driver core: Fix wait_for_device_probe() & deferred_probe_timeout interaction |
| |
| Mounting NFS rootfs was timing out when deferred_probe_timeout was |
| non-zero [1]. This was because ip_auto_config() initcall times out |
| waiting for the network interfaces to show up when |
| deferred_probe_timeout was non-zero. While ip_auto_config() calls |
| wait_for_device_probe() to make sure any currently running deferred |
| probe work or asynchronous probe finishes, that wasn't sufficient to |
| account for devices being deferred until deferred_probe_timeout. |
| |
| Commit 35a672363ab3 ("driver core: Ensure wait_for_device_probe() waits |
| until the deferred_probe_timeout fires") tried to fix that by making |
| sure wait_for_device_probe() waits for deferred_probe_timeout to expire |
| before returning. |
| |
| However, if wait_for_device_probe() is called from the kernel_init() |
| context: |
| |
| - Before deferred_probe_initcall() [2], it causes the boot process to |
| hang due to a deadlock. |
| |
| - After deferred_probe_initcall() [3], it blocks kernel_init() from |
| continuing till deferred_probe_timeout expires and beats the point of |
| deferred_probe_timeout that's trying to wait for userspace to load |
| modules. |
| |
| Neither of this is good. So revert the changes to |
| wait_for_device_probe(). |
| |
| [1] - https://lore.kernel.org/lkml/TYAPR01MB45443DF63B9EF29054F7C41FD8C60@TYAPR01MB4544.jpnprd01.prod.outlook.com/ |
| [2] - https://lore.kernel.org/lkml/YowHNo4sBjr9ijZr@dev-arch.thelio-3990X/ |
| [3] - https://lore.kernel.org/lkml/Yo3WvGnNk3LvLb7R@linutronix.de/ |
| |
| The Linux kernel CVE team has assigned CVE-2022-49379 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 5.7 with commit 35a672363ab3e8dfe4ebcadb4dd0b2d06bb85ebe and fixed in 5.10.122 with commit 71cbce75031aed26c72c2dc8a83111d181685f1b |
| Issue introduced in 5.7 with commit 35a672363ab3e8dfe4ebcadb4dd0b2d06bb85ebe and fixed in 5.15.47 with commit 29357883a89193863f3cc6a2c5e0b42ceb022761 |
| Issue introduced in 5.7 with commit 35a672363ab3e8dfe4ebcadb4dd0b2d06bb85ebe and fixed in 5.17.15 with commit 528229474e1cbb1b3451cb713d94aecb5f6ee264 |
| Issue introduced in 5.7 with commit 35a672363ab3e8dfe4ebcadb4dd0b2d06bb85ebe and fixed in 5.18.4 with commit 4ad6af07efcca85369c21e4897b3020cff2c170b |
| Issue introduced in 5.7 with commit 35a672363ab3e8dfe4ebcadb4dd0b2d06bb85ebe and fixed in 5.19 with commit 5ee76c256e928455212ab759c51d198fedbe7523 |
| |
| 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-2022-49379 |
| 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/base/dd.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/71cbce75031aed26c72c2dc8a83111d181685f1b |
| https://git.kernel.org/stable/c/29357883a89193863f3cc6a2c5e0b42ceb022761 |
| https://git.kernel.org/stable/c/528229474e1cbb1b3451cb713d94aecb5f6ee264 |
| https://git.kernel.org/stable/c/4ad6af07efcca85369c21e4897b3020cff2c170b |
| https://git.kernel.org/stable/c/5ee76c256e928455212ab759c51d198fedbe7523 |
