ghsa-rj28-pp8g-vc2r
Vulnerability from github
Published
2024-06-24 15:31
Modified
2024-06-26 15:31
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Details

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): [] finish_task_switch.isra.0+0xa8/0x2d4 [ 19.405140] hardirqs last disabled at (182): [] __schedule+0x714/0xd04 [ 19.413612] softirqs last enabled at (114): [] srcu_invoke_callbacks+0x158/0x23c [ 19.423128] softirqs last disabled at (110): [] srcu_invoke_callbacks+0x158/0x23c [ 19.432614] ---[ end trace 0000000000000000 ]---

(cherry picked from commit 61ba791c4a7a09a370c45b70a81b8c7d4cf6b2ae)

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{
  "affected": [],
  "aliases": [
    "CVE-2024-38664"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-667"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2024-06-24T14:15:12Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm: zynqmp_dpsub: Always register bridge\n\nWe must always register the DRM bridge, since zynqmp_dp_hpd_work_func\ncalls drm_bridge_hpd_notify, which in turn expects hpd_mutex to be\ninitialized. We do this before zynqmp_dpsub_drm_init since that calls\ndrm_bridge_attach. This fixes the following lockdep warning:\n\n[   19.217084] ------------[ cut here ]------------\n[   19.227530] DEBUG_LOCKS_WARN_ON(lock-\u003emagic != lock)\n[   19.227768] WARNING: CPU: 0 PID: 140 at kernel/locking/mutex.c:582 __mutex_lock+0x4bc/0x550\n[   19.241696] Modules linked in:\n[   19.244937] CPU: 0 PID: 140 Comm: kworker/0:4 Not tainted 6.6.20+ #96\n[   19.252046] Hardware name: xlnx,zynqmp (DT)\n[   19.256421] Workqueue: events zynqmp_dp_hpd_work_func\n[   19.261795] pstate: 60000005 (nZCv daif -PAN -UAO -TCO -DIT -SSBS BTYPE=--)\n[   19.269104] pc : __mutex_lock+0x4bc/0x550\n[   19.273364] lr : __mutex_lock+0x4bc/0x550\n[   19.277592] sp : ffffffc085c5bbe0\n[   19.281066] x29: ffffffc085c5bbe0 x28: 0000000000000000 x27: ffffff88009417f8\n[   19.288624] x26: ffffff8800941788 x25: ffffff8800020008 x24: ffffffc082aa3000\n[   19.296227] x23: ffffffc080d90e3c x22: 0000000000000002 x21: 0000000000000000\n[   19.303744] x20: 0000000000000000 x19: ffffff88002f5210 x18: 0000000000000000\n[   19.311295] x17: 6c707369642e3030 x16: 3030613464662072 x15: 0720072007200720\n[   19.318922] x14: 0000000000000000 x13: 284e4f5f4e524157 x12: 0000000000000001\n[   19.326442] x11: 0001ffc085c5b940 x10: 0001ff88003f388b x9 : 0001ff88003f3888\n[   19.334003] x8 : 0001ff88003f3888 x7 : 0000000000000000 x6 : 0000000000000000\n[   19.341537] x5 : 0000000000000000 x4 : 0000000000001668 x3 : 0000000000000000\n[   19.349054] x2 : 0000000000000000 x1 : 0000000000000000 x0 : ffffff88003f3880\n[   19.356581] Call trace:\n[   19.359160]  __mutex_lock+0x4bc/0x550\n[   19.363032]  mutex_lock_nested+0x24/0x30\n[   19.367187]  drm_bridge_hpd_notify+0x2c/0x6c\n[   19.371698]  zynqmp_dp_hpd_work_func+0x44/0x54\n[   19.376364]  process_one_work+0x3ac/0x988\n[   19.380660]  worker_thread+0x398/0x694\n[   19.384736]  kthread+0x1bc/0x1c0\n[   19.388241]  ret_from_fork+0x10/0x20\n[   19.392031] irq event stamp: 183\n[   19.395450] hardirqs last  enabled at (183): [\u003cffffffc0800b9278\u003e] finish_task_switch.isra.0+0xa8/0x2d4\n[   19.405140] hardirqs last disabled at (182): [\u003cffffffc081ad3754\u003e] __schedule+0x714/0xd04\n[   19.413612] softirqs last  enabled at (114): [\u003cffffffc080133de8\u003e] srcu_invoke_callbacks+0x158/0x23c\n[   19.423128] softirqs last disabled at (110): [\u003cffffffc080133de8\u003e] srcu_invoke_callbacks+0x158/0x23c\n[   19.432614] ---[ end trace 0000000000000000 ]---\n\n(cherry picked from commit 61ba791c4a7a09a370c45b70a81b8c7d4cf6b2ae)",
  "id": "GHSA-rj28-pp8g-vc2r",
  "modified": "2024-06-26T15:31:01Z",
  "published": "2024-06-24T15:31:45Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2024-38664"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/603661357056b5e5ba6d86f505fbc936eff396ba"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6ead3eccf67bc8318b1ce95ed879b2cc05b4fce9"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/be3f3042391d061cfca2bd22630e0d101acea5fc"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}


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