| 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-2024-41008: drm/amdgpu: change vm->task_info handling |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| drm/amdgpu: change vm->task_info handling |
| |
| This patch changes the handling and lifecycle of vm->task_info object. |
| The major changes are: |
| - vm->task_info is a dynamically allocated ptr now, and its uasge is |
| reference counted. |
| - introducing two new helper funcs for task_info lifecycle management |
| - amdgpu_vm_get_task_info: reference counts up task_info before |
| returning this info |
| - amdgpu_vm_put_task_info: reference counts down task_info |
| - last put to task_info() frees task_info from the vm. |
| |
| This patch also does logistical changes required for existing usage |
| of vm->task_info. |
| |
| V2: Do not block all the prints when task_info not found (Felix) |
| |
| V3: Fixed review comments from Felix |
| - Fix wrong indentation |
| - No debug message for -ENOMEM |
| - Add NULL check for task_info |
| - Do not duplicate the debug messages (ti vs no ti) |
| - Get first reference of task_info in vm_init(), put last |
| in vm_fini() |
| |
| V4: Fixed review comments from Felix |
| - fix double reference increment in create_task_info |
| - change amdgpu_vm_get_task_info_pasid |
| - additional changes in amdgpu_gem.c while porting |
| |
| The Linux kernel CVE team has assigned CVE-2024-41008 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Fixed in 6.9 with commit b8f67b9ddf4f8fe6dd536590712b5912ad78f99c |
| |
| 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-2024-41008 |
| 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/gpu/drm/amd/amdgpu/amdgpu_debugfs.c |
| drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c |
| drivers/gpu/drm/amd/amdgpu/amdgpu_job.c |
| drivers/gpu/drm/amd/amdgpu/amdgpu_reset.c |
| drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c |
| drivers/gpu/drm/amd/amdgpu/amdgpu_vm.h |
| drivers/gpu/drm/amd/amdgpu/amdgpu_vm_pt.c |
| drivers/gpu/drm/amd/amdgpu/gmc_v10_0.c |
| drivers/gpu/drm/amd/amdgpu/gmc_v11_0.c |
| drivers/gpu/drm/amd/amdgpu/gmc_v8_0.c |
| drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c |
| drivers/gpu/drm/amd/amdgpu/sdma_v4_0.c |
| drivers/gpu/drm/amd/amdgpu/sdma_v4_4_2.c |
| drivers/gpu/drm/amd/amdkfd/kfd_smi_events.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/b8f67b9ddf4f8fe6dd536590712b5912ad78f99c |
