| 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-2024-26786: iommufd: Fix iopt_access_list_id overwrite bug |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| iommufd: Fix iopt_access_list_id overwrite bug |
| |
| Syzkaller reported the following WARN_ON: |
| WARNING: CPU: 1 PID: 4738 at drivers/iommu/iommufd/io_pagetable.c:1360 |
| |
| Call Trace: |
| iommufd_access_change_ioas+0x2fe/0x4e0 |
| iommufd_access_destroy_object+0x50/0xb0 |
| iommufd_object_remove+0x2a3/0x490 |
| iommufd_object_destroy_user |
| iommufd_access_destroy+0x71/0xb0 |
| iommufd_test_staccess_release+0x89/0xd0 |
| __fput+0x272/0xb50 |
| __fput_sync+0x4b/0x60 |
| __do_sys_close |
| __se_sys_close |
| __x64_sys_close+0x8b/0x110 |
| do_syscall_x64 |
| |
| The mismatch between the access pointer in the list and the passed-in |
| pointer is resulting from an overwrite of access->iopt_access_list_id, in |
| iopt_add_access(). Called from iommufd_access_change_ioas() when |
| xa_alloc() succeeds but iopt_calculate_iova_alignment() fails. |
| |
| Add a new_id in iopt_add_access() and only update iopt_access_list_id when |
| returning successfully. |
| |
| The Linux kernel CVE team has assigned CVE-2024-26786 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 6.6 with commit 9227da7816dd1a42e20d41e2244cb63c205477ca and fixed in 6.6.21 with commit f1fb745ee0a6fe43f1d84ec369c7e6af2310fda9 |
| Issue introduced in 6.6 with commit 9227da7816dd1a42e20d41e2244cb63c205477ca and fixed in 6.7.9 with commit 9526a46cc0c378d381560279bea9aa34c84298a0 |
| Issue introduced in 6.6 with commit 9227da7816dd1a42e20d41e2244cb63c205477ca and fixed in 6.8 with commit aeb004c0cd6958e910123a1607634401009c9539 |
| |
| 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-2024-26786 |
| 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/iommu/iommufd/io_pagetable.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/f1fb745ee0a6fe43f1d84ec369c7e6af2310fda9 |
| https://git.kernel.org/stable/c/9526a46cc0c378d381560279bea9aa34c84298a0 |
| https://git.kernel.org/stable/c/aeb004c0cd6958e910123a1607634401009c9539 |
