| 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-2024-50297: net: xilinx: axienet: Enqueue Tx packets in dql before dmaengine starts |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| net: xilinx: axienet: Enqueue Tx packets in dql before dmaengine starts |
| |
| Enqueue packets in dql after dma engine starts causes race condition. |
| Tx transfer starts once dma engine is started and may execute dql dequeue |
| in completion before it gets queued. It results in following kernel crash |
| while running iperf stress test: |
| |
| kernel BUG at lib/dynamic_queue_limits.c:99! |
| <snip> |
| Internal error: Oops - BUG: 00000000f2000800 [#1] SMP |
| pc : dql_completed+0x238/0x248 |
| lr : dql_completed+0x3c/0x248 |
| |
| Call trace: |
| dql_completed+0x238/0x248 |
| axienet_dma_tx_cb+0xa0/0x170 |
| xilinx_dma_do_tasklet+0xdc/0x290 |
| tasklet_action_common+0xf8/0x11c |
| tasklet_action+0x30/0x3c |
| handle_softirqs+0xf8/0x230 |
| <snip> |
| |
| Start dmaengine after enqueue in dql fixes the crash. |
| |
| The Linux kernel CVE team has assigned CVE-2024-50297 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 6.8 with commit 6a91b846af85a24241decd686269e8e038eb13d1 and fixed in 6.11.8 with commit def3dee25cbd1c9b2ed443c3f6180e952563de77 |
| Issue introduced in 6.8 with commit 6a91b846af85a24241decd686269e8e038eb13d1 and fixed in 6.12 with commit 5ccdcdf186aec6b9111845fd37e1757e9b413e2f |
| |
| 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-2024-50297 |
| 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/net/ethernet/xilinx/xilinx_axienet_main.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/def3dee25cbd1c9b2ed443c3f6180e952563de77 |
| https://git.kernel.org/stable/c/5ccdcdf186aec6b9111845fd37e1757e9b413e2f |
