| 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-2022-48780: net/smc: Avoid overwriting the copies of clcsock callback functions |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| net/smc: Avoid overwriting the copies of clcsock callback functions |
| |
| The callback functions of clcsock will be saved and replaced during |
| the fallback. But if the fallback happens more than once, then the |
| copies of these callback functions will be overwritten incorrectly, |
| resulting in a loop call issue: |
| |
| clcsk->sk_error_report |
| |- smc_fback_error_report() <------------------------------| |
| |- smc_fback_forward_wakeup() | (loop) |
| |- clcsock_callback() (incorrectly overwritten) | |
| |- smc->clcsk_error_report() ------------------| |
| |
| So this patch fixes the issue by saving these function pointers only |
| once in the fallback and avoiding overwriting. |
| |
| The Linux kernel CVE team has assigned CVE-2022-48780 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 5.15.22 with commit 0ef6049f664941bc0f75828b3a61877635048b27 and fixed in 5.15.25 with commit 7de7ba7a8bd4fde0141de8674c13514d0072f0e6 |
| Issue introduced in 5.16.8 with commit 504078fbe9dd570d685361b57784a6050bc40aaa and fixed in 5.16.11 with commit f00b6c976ae0dfbd9b891175f713f59095d23842 |
| |
| 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-2022-48780 |
| 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: |
| net/smc/af_smc.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/7de7ba7a8bd4fde0141de8674c13514d0072f0e6 |
| https://git.kernel.org/stable/c/f00b6c976ae0dfbd9b891175f713f59095d23842 |
| https://git.kernel.org/stable/c/1de9770d121ee9294794cca0e0be8fbfa0134ee8 |
