| 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-2022-49304: drivers: tty: serial: Fix deadlock in sa1100_set_termios() |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| drivers: tty: serial: Fix deadlock in sa1100_set_termios() |
| |
| There is a deadlock in sa1100_set_termios(), which is shown |
| below: |
| |
| (Thread 1) | (Thread 2) |
| | sa1100_enable_ms() |
| sa1100_set_termios() | mod_timer() |
| spin_lock_irqsave() //(1) | (wait a time) |
| ... | sa1100_timeout() |
| del_timer_sync() | spin_lock_irqsave() //(2) |
| (wait timer to stop) | ... |
| |
| We hold sport->port.lock in position (1) of thread 1 and |
| use del_timer_sync() to wait timer to stop, but timer handler |
| also need sport->port.lock in position (2) of thread 2. As a result, |
| sa1100_set_termios() will block forever. |
| |
| This patch moves del_timer_sync() before spin_lock_irqsave() |
| in order to prevent the deadlock. |
| |
| The Linux kernel CVE team has assigned CVE-2022-49304 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Fixed in 4.9.318 with commit 0976808d0d171ec837d4bd3e9f4ad4a00ab703b8 |
| Fixed in 4.14.283 with commit 85e20f8bd31a46d8c60103d0274a8ebe8f47f2b2 |
| Fixed in 4.19.247 with commit 920f0ae7a129ffee98a106e3bbdfd61a2a59e939 |
| Fixed in 5.4.198 with commit 09a5958a2452ad22d0cb638711ef34ea1863a829 |
| Fixed in 5.10.122 with commit 6e2273eefab54a521d9c59efb6e1114e742bdf41 |
| Fixed in 5.15.47 with commit 2cbfc38df580bff5b2fe19f21c1a7520efcc4b3b |
| Fixed in 5.17.15 with commit 553213432ef0c295becdc08c0207d2094468f673 |
| Fixed in 5.18.4 with commit 34d91e555e5582cffdbcbb75517bc9217866823e |
| Fixed in 5.19 with commit 62b2caef400c1738b6d22f636c628d9f85cd4c4c |
| |
| 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-2022-49304 |
| 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/tty/serial/sa1100.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/0976808d0d171ec837d4bd3e9f4ad4a00ab703b8 |
| https://git.kernel.org/stable/c/85e20f8bd31a46d8c60103d0274a8ebe8f47f2b2 |
| https://git.kernel.org/stable/c/920f0ae7a129ffee98a106e3bbdfd61a2a59e939 |
| https://git.kernel.org/stable/c/09a5958a2452ad22d0cb638711ef34ea1863a829 |
| https://git.kernel.org/stable/c/6e2273eefab54a521d9c59efb6e1114e742bdf41 |
| https://git.kernel.org/stable/c/2cbfc38df580bff5b2fe19f21c1a7520efcc4b3b |
| https://git.kernel.org/stable/c/553213432ef0c295becdc08c0207d2094468f673 |
| https://git.kernel.org/stable/c/34d91e555e5582cffdbcbb75517bc9217866823e |
| https://git.kernel.org/stable/c/62b2caef400c1738b6d22f636c628d9f85cd4c4c |
