| 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-2023-52608: firmware: arm_scmi: Check mailbox/SMT channel for consistency |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| firmware: arm_scmi: Check mailbox/SMT channel for consistency |
| |
| On reception of a completion interrupt the shared memory area is accessed |
| to retrieve the message header at first and then, if the message sequence |
| number identifies a transaction which is still pending, the related |
| payload is fetched too. |
| |
| When an SCMI command times out the channel ownership remains with the |
| platform until eventually a late reply is received and, as a consequence, |
| any further transmission attempt remains pending, waiting for the channel |
| to be relinquished by the platform. |
| |
| Once that late reply is received the channel ownership is given back |
| to the agent and any pending request is then allowed to proceed and |
| overwrite the SMT area of the just delivered late reply; then the wait |
| for the reply to the new request starts. |
| |
| It has been observed that the spurious IRQ related to the late reply can |
| be wrongly associated with the freshly enqueued request: when that happens |
| the SCMI stack in-flight lookup procedure is fooled by the fact that the |
| message header now present in the SMT area is related to the new pending |
| transaction, even though the real reply has still to arrive. |
| |
| This race-condition on the A2P channel can be detected by looking at the |
| channel status bits: a genuine reply from the platform will have set the |
| channel free bit before triggering the completion IRQ. |
| |
| Add a consistency check to validate such condition in the A2P ISR. |
| |
| The Linux kernel CVE team has assigned CVE-2023-52608 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 5.7 with commit 5c8a47a5a91d4d6e185f758d61997613d9c5d6ac and fixed in 5.15.149 with commit 614cc65032dcb0b64d23f5c5e338a8a04b12be5d |
| Issue introduced in 5.7 with commit 5c8a47a5a91d4d6e185f758d61997613d9c5d6ac and fixed in 6.1.76 with commit 7f95f6997f4fdd17abec3200cae45420a5489350 |
| Issue introduced in 5.7 with commit 5c8a47a5a91d4d6e185f758d61997613d9c5d6ac and fixed in 6.6.15 with commit 9b5e1b93c83ee5fc9f5d7bd2d45b421bd87774a2 |
| Issue introduced in 5.7 with commit 5c8a47a5a91d4d6e185f758d61997613d9c5d6ac and fixed in 6.7.3 with commit 12dc4217f16551d6dee9cbefc23fdb5659558cda |
| Issue introduced in 5.7 with commit 5c8a47a5a91d4d6e185f758d61997613d9c5d6ac and fixed in 6.8 with commit 437a310b22244d4e0b78665c3042e5d1c0f45306 |
| |
| 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-2023-52608 |
| 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/firmware/arm_scmi/common.h |
| drivers/firmware/arm_scmi/mailbox.c |
| drivers/firmware/arm_scmi/shmem.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/614cc65032dcb0b64d23f5c5e338a8a04b12be5d |
| https://git.kernel.org/stable/c/7f95f6997f4fdd17abec3200cae45420a5489350 |
| https://git.kernel.org/stable/c/9b5e1b93c83ee5fc9f5d7bd2d45b421bd87774a2 |
| https://git.kernel.org/stable/c/12dc4217f16551d6dee9cbefc23fdb5659558cda |
| https://git.kernel.org/stable/c/437a310b22244d4e0b78665c3042e5d1c0f45306 |
