| 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-2022-49229: ptp: unregister virtual clocks when unregistering physical clock. |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| ptp: unregister virtual clocks when unregistering physical clock. |
| |
| When unregistering a physical clock which has some virtual clocks, |
| unregister the virtual clocks with it. |
| |
| This fixes the following oops, which can be triggered by unloading |
| a driver providing a PTP clock when it has enabled virtual clocks: |
| |
| BUG: unable to handle page fault for address: ffffffffc04fc4d8 |
| Oops: 0000 [#1] PREEMPT SMP NOPTI |
| RIP: 0010:ptp_vclock_read+0x31/0xb0 |
| Call Trace: |
| timecounter_read+0xf/0x50 |
| ptp_vclock_refresh+0x2c/0x50 |
| ? ptp_clock_release+0x40/0x40 |
| ptp_aux_kworker+0x17/0x30 |
| kthread_worker_fn+0x9b/0x240 |
| ? kthread_should_park+0x30/0x30 |
| kthread+0xe2/0x110 |
| ? kthread_complete_and_exit+0x20/0x20 |
| ret_from_fork+0x22/0x30 |
| |
| The Linux kernel CVE team has assigned CVE-2022-49229 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 5.14 with commit 73f37068d540eba5f93ba3a0019bf479d35ebd76 and fixed in 5.15.33 with commit b2dea2a696d09163da4cd33cb598ce1f73e86597 |
| Issue introduced in 5.14 with commit 73f37068d540eba5f93ba3a0019bf479d35ebd76 and fixed in 5.16.19 with commit 9c796a57cbb5daf124a665689f0b2bc9262e0ced |
| Issue introduced in 5.14 with commit 73f37068d540eba5f93ba3a0019bf479d35ebd76 and fixed in 5.17.2 with commit c49eafe6249f844c26f9866886cc6719d81762df |
| Issue introduced in 5.14 with commit 73f37068d540eba5f93ba3a0019bf479d35ebd76 and fixed in 5.18 with commit bfcbb76b0f595ea9ede9f7a218086fef85242f10 |
| |
| 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-2022-49229 |
| 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/ptp/ptp_clock.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/b2dea2a696d09163da4cd33cb598ce1f73e86597 |
| https://git.kernel.org/stable/c/9c796a57cbb5daf124a665689f0b2bc9262e0ced |
| https://git.kernel.org/stable/c/c49eafe6249f844c26f9866886cc6719d81762df |
| https://git.kernel.org/stable/c/bfcbb76b0f595ea9ede9f7a218086fef85242f10 |
