| 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-2024-50141: ACPI: PRM: Find EFI_MEMORY_RUNTIME block for PRM handler and context |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| ACPI: PRM: Find EFI_MEMORY_RUNTIME block for PRM handler and context |
| |
| PRMT needs to find the correct type of block to translate the PA-VA |
| mapping for EFI runtime services. |
| |
| The issue arises because the PRMT is finding a block of type |
| EFI_CONVENTIONAL_MEMORY, which is not appropriate for runtime services |
| as described in Section 2.2.2 (Runtime Services) of the UEFI |
| Specification [1]. Since the PRM handler is a type of runtime service, |
| this causes an exception when the PRM handler is called. |
| |
| [Firmware Bug]: Unable to handle paging request in EFI runtime service |
| WARNING: CPU: 22 PID: 4330 at drivers/firmware/efi/runtime-wrappers.c:341 |
| __efi_queue_work+0x11c/0x170 |
| Call trace: |
| |
| Let PRMT find a block with EFI_MEMORY_RUNTIME for PRM handler and PRM |
| context. |
| |
| If no suitable block is found, a warning message will be printed, but |
| the procedure continues to manage the next PRM handler. |
| |
| However, if the PRM handler is actually called without proper allocation, |
| it would result in a failure during error handling. |
| |
| By using the correct memory types for runtime services, ensure that the |
| PRM handler and the context are properly mapped in the virtual address |
| space during runtime, preventing the paging request error. |
| |
| The issue is really that only memory that has been remapped for runtime |
| by the firmware can be used by the PRM handler, and so the region needs |
| to have the EFI_MEMORY_RUNTIME attribute. |
| |
| [ rjw: Subject and changelog edits ] |
| |
| The Linux kernel CVE team has assigned CVE-2024-50141 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 5.14 with commit cefc7ca46235f01d5233e3abd4b79452af01d9e9 and fixed in 5.15.171 with commit 8df52929530839e878e6912e33348b54101e3250 |
| Issue introduced in 5.14 with commit cefc7ca46235f01d5233e3abd4b79452af01d9e9 and fixed in 6.1.115 with commit 8ce081ad842510f0e70fa6065a401660eac876d4 |
| Issue introduced in 5.14 with commit cefc7ca46235f01d5233e3abd4b79452af01d9e9 and fixed in 6.6.59 with commit 795b080d9aa127215a5baf088a22fa09341a0126 |
| Issue introduced in 5.14 with commit cefc7ca46235f01d5233e3abd4b79452af01d9e9 and fixed in 6.11.6 with commit 20e9fafb8bb6f545667d7916b0e81e68c0748810 |
| Issue introduced in 5.14 with commit cefc7ca46235f01d5233e3abd4b79452af01d9e9 and fixed in 6.12 with commit 088984c8d54c0053fc4ae606981291d741c5924b |
| |
| 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-2024-50141 |
| 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/acpi/prmt.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/8df52929530839e878e6912e33348b54101e3250 |
| https://git.kernel.org/stable/c/8ce081ad842510f0e70fa6065a401660eac876d4 |
| https://git.kernel.org/stable/c/795b080d9aa127215a5baf088a22fa09341a0126 |
| https://git.kernel.org/stable/c/20e9fafb8bb6f545667d7916b0e81e68c0748810 |
| https://git.kernel.org/stable/c/088984c8d54c0053fc4ae606981291d741c5924b |
