| 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-2021-47016: m68k: mvme147,mvme16x: Don't wipe PCC timer config bits |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| m68k: mvme147,mvme16x: Don't wipe PCC timer config bits |
| |
| Don't clear the timer 1 configuration bits when clearing the interrupt flag |
| and counter overflow. As Michael reported, "This results in no timer |
| interrupts being delivered after the first. Initialization then hangs |
| in calibrate_delay as the jiffies counter is not updated." |
| |
| On mvme16x, enable the timer after requesting the irq, consistent with |
| mvme147. |
| |
| The Linux kernel CVE team has assigned CVE-2021-47016 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 5.2 with commit 7529b90d051e4629884771ba2b1d3a87d2c6a9d7 and fixed in 5.4.119 with commit f6a90818a32058fca62cda3a2027a6a2364e1878 |
| Issue introduced in 5.2 with commit 7529b90d051e4629884771ba2b1d3a87d2c6a9d7 and fixed in 5.10.37 with commit 1dfb26df15fc7036a74221d43de7427f74293dae |
| Issue introduced in 5.2 with commit 7529b90d051e4629884771ba2b1d3a87d2c6a9d7 and fixed in 5.11.21 with commit 73fdeb612d25b5e105c219e05434285a45d23576 |
| Issue introduced in 5.2 with commit 7529b90d051e4629884771ba2b1d3a87d2c6a9d7 and fixed in 5.12.4 with commit 5d34225169346cab5145978d153b9ce90e9ace21 |
| Issue introduced in 5.2 with commit 7529b90d051e4629884771ba2b1d3a87d2c6a9d7 and fixed in 5.13 with commit 43262178c043032e7c42d00de44c818ba05f9967 |
| |
| 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-2021-47016 |
| 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: |
| arch/m68k/include/asm/mvme147hw.h |
| arch/m68k/mvme147/config.c |
| arch/m68k/mvme16x/config.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/f6a90818a32058fca62cda3a2027a6a2364e1878 |
| https://git.kernel.org/stable/c/1dfb26df15fc7036a74221d43de7427f74293dae |
| https://git.kernel.org/stable/c/73fdeb612d25b5e105c219e05434285a45d23576 |
| https://git.kernel.org/stable/c/5d34225169346cab5145978d153b9ce90e9ace21 |
| https://git.kernel.org/stable/c/43262178c043032e7c42d00de44c818ba05f9967 |
