| 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-2024-36969: drm/amd/display: Fix division by zero in setup_dsc_config |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| drm/amd/display: Fix division by zero in setup_dsc_config |
| |
| When slice_height is 0, the division by slice_height in the calculation |
| of the number of slices will cause a division by zero driver crash. This |
| leaves the kernel in a state that requires a reboot. This patch adds a |
| check to avoid the division by zero. |
| |
| The stack trace below is for the 6.8.4 Kernel. I reproduced the issue on |
| a Z16 Gen 2 Lenovo Thinkpad with a Apple Studio Display monitor |
| connected via Thunderbolt. The amdgpu driver crashed with this exception |
| when I rebooted the system with the monitor connected. |
| |
| kernel: ? die (arch/x86/kernel/dumpstack.c:421 arch/x86/kernel/dumpstack.c:434 arch/x86/kernel/dumpstack.c:447) |
| kernel: ? do_trap (arch/x86/kernel/traps.c:113 arch/x86/kernel/traps.c:154) |
| kernel: ? setup_dsc_config (drivers/gpu/drm/amd/amdgpu/../display/dc/dsc/dc_dsc.c:1053) amdgpu |
| kernel: ? do_error_trap (./arch/x86/include/asm/traps.h:58 arch/x86/kernel/traps.c:175) |
| kernel: ? setup_dsc_config (drivers/gpu/drm/amd/amdgpu/../display/dc/dsc/dc_dsc.c:1053) amdgpu |
| kernel: ? exc_divide_error (arch/x86/kernel/traps.c:194 (discriminator 2)) |
| kernel: ? setup_dsc_config (drivers/gpu/drm/amd/amdgpu/../display/dc/dsc/dc_dsc.c:1053) amdgpu |
| kernel: ? asm_exc_divide_error (./arch/x86/include/asm/idtentry.h:548) |
| kernel: ? setup_dsc_config (drivers/gpu/drm/amd/amdgpu/../display/dc/dsc/dc_dsc.c:1053) amdgpu |
| kernel: dc_dsc_compute_config (drivers/gpu/drm/amd/amdgpu/../display/dc/dsc/dc_dsc.c:1109) amdgpu |
| |
| After applying this patch, the driver no longer crashes when the monitor |
| is connected and the system is rebooted. I believe this is the same |
| issue reported for 3113. |
| |
| The Linux kernel CVE team has assigned CVE-2024-36969 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Fixed in 5.15.160 with commit a32c8f951c8a456c1c251e1dcdf21787f8066445 |
| Fixed in 6.1.92 with commit 91402e0e5de9124a3108db7a14163fcf9a6d322f |
| Fixed in 6.6.32 with commit 7e4f50dfc98c49b3dc6875a35c3112522fb25639 |
| Fixed in 6.8.11 with commit f187fcbbb8f8bf10c6687f0beae22509369f7563 |
| Fixed in 6.9.2 with commit 308de6be0c9c7ba36915c0d398e771725c0ea911 |
| Fixed in 6.10 with commit 130afc8a886183a94cf6eab7d24f300014ff87ba |
| |
| 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-2024-36969 |
| 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/display/dc/dsc/dc_dsc.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/a32c8f951c8a456c1c251e1dcdf21787f8066445 |
| https://git.kernel.org/stable/c/91402e0e5de9124a3108db7a14163fcf9a6d322f |
| https://git.kernel.org/stable/c/7e4f50dfc98c49b3dc6875a35c3112522fb25639 |
| https://git.kernel.org/stable/c/f187fcbbb8f8bf10c6687f0beae22509369f7563 |
| https://git.kernel.org/stable/c/308de6be0c9c7ba36915c0d398e771725c0ea911 |
| https://git.kernel.org/stable/c/130afc8a886183a94cf6eab7d24f300014ff87ba |
