| 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-2024-38664: drm: zynqmp_dpsub: Always register bridge |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| drm: zynqmp_dpsub: Always register bridge |
| |
| We must always register the DRM bridge, since zynqmp_dp_hpd_work_func |
| calls drm_bridge_hpd_notify, which in turn expects hpd_mutex to be |
| initialized. We do this before zynqmp_dpsub_drm_init since that calls |
| drm_bridge_attach. This fixes the following lockdep warning: |
| |
| [ 19.217084] ------------[ cut here ]------------ |
| [ 19.227530] DEBUG_LOCKS_WARN_ON(lock->magic != lock) |
| [ 19.227768] WARNING: CPU: 0 PID: 140 at kernel/locking/mutex.c:582 __mutex_lock+0x4bc/0x550 |
| [ 19.241696] Modules linked in: |
| [ 19.244937] CPU: 0 PID: 140 Comm: kworker/0:4 Not tainted 6.6.20+ #96 |
| [ 19.252046] Hardware name: xlnx,zynqmp (DT) |
| [ 19.256421] Workqueue: events zynqmp_dp_hpd_work_func |
| [ 19.261795] pstate: 60000005 (nZCv daif -PAN -UAO -TCO -DIT -SSBS BTYPE=--) |
| [ 19.269104] pc : __mutex_lock+0x4bc/0x550 |
| [ 19.273364] lr : __mutex_lock+0x4bc/0x550 |
| [ 19.277592] sp : ffffffc085c5bbe0 |
| [ 19.281066] x29: ffffffc085c5bbe0 x28: 0000000000000000 x27: ffffff88009417f8 |
| [ 19.288624] x26: ffffff8800941788 x25: ffffff8800020008 x24: ffffffc082aa3000 |
| [ 19.296227] x23: ffffffc080d90e3c x22: 0000000000000002 x21: 0000000000000000 |
| [ 19.303744] x20: 0000000000000000 x19: ffffff88002f5210 x18: 0000000000000000 |
| [ 19.311295] x17: 6c707369642e3030 x16: 3030613464662072 x15: 0720072007200720 |
| [ 19.318922] x14: 0000000000000000 x13: 284e4f5f4e524157 x12: 0000000000000001 |
| [ 19.326442] x11: 0001ffc085c5b940 x10: 0001ff88003f388b x9 : 0001ff88003f3888 |
| [ 19.334003] x8 : 0001ff88003f3888 x7 : 0000000000000000 x6 : 0000000000000000 |
| [ 19.341537] x5 : 0000000000000000 x4 : 0000000000001668 x3 : 0000000000000000 |
| [ 19.349054] x2 : 0000000000000000 x1 : 0000000000000000 x0 : ffffff88003f3880 |
| [ 19.356581] Call trace: |
| [ 19.359160] __mutex_lock+0x4bc/0x550 |
| [ 19.363032] mutex_lock_nested+0x24/0x30 |
| [ 19.367187] drm_bridge_hpd_notify+0x2c/0x6c |
| [ 19.371698] zynqmp_dp_hpd_work_func+0x44/0x54 |
| [ 19.376364] process_one_work+0x3ac/0x988 |
| [ 19.380660] worker_thread+0x398/0x694 |
| [ 19.384736] kthread+0x1bc/0x1c0 |
| [ 19.388241] ret_from_fork+0x10/0x20 |
| [ 19.392031] irq event stamp: 183 |
| [ 19.395450] hardirqs last enabled at (183): [<ffffffc0800b9278>] finish_task_switch.isra.0+0xa8/0x2d4 |
| [ 19.405140] hardirqs last disabled at (182): [<ffffffc081ad3754>] __schedule+0x714/0xd04 |
| [ 19.413612] softirqs last enabled at (114): [<ffffffc080133de8>] srcu_invoke_callbacks+0x158/0x23c |
| [ 19.423128] softirqs last disabled at (110): [<ffffffc080133de8>] srcu_invoke_callbacks+0x158/0x23c |
| [ 19.432614] ---[ end trace 0000000000000000 ]--- |
| |
| (cherry picked from commit 61ba791c4a7a09a370c45b70a81b8c7d4cf6b2ae) |
| |
| The Linux kernel CVE team has assigned CVE-2024-38664 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 6.2 with commit eb2d64bfcc174919a921295a5327b99a3b8f4166 and fixed in 6.6.33 with commit 6ead3eccf67bc8318b1ce95ed879b2cc05b4fce9 |
| Issue introduced in 6.2 with commit eb2d64bfcc174919a921295a5327b99a3b8f4166 and fixed in 6.9.4 with commit 603661357056b5e5ba6d86f505fbc936eff396ba |
| Issue introduced in 6.2 with commit eb2d64bfcc174919a921295a5327b99a3b8f4166 and fixed in 6.10 with commit be3f3042391d061cfca2bd22630e0d101acea5fc |
| |
| 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-2024-38664 |
| 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/xlnx/zynqmp_dpsub.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/6ead3eccf67bc8318b1ce95ed879b2cc05b4fce9 |
| https://git.kernel.org/stable/c/603661357056b5e5ba6d86f505fbc936eff396ba |
| https://git.kernel.org/stable/c/be3f3042391d061cfca2bd22630e0d101acea5fc |
