ghsa-cfg9-pfwm-v8pc
Vulnerability from github
In the Linux kernel, the following vulnerability has been resolved:
drm/vmwgfx: Create debugfs ttm_resource_manager entry only if needed
The driver creates /sys/kernel/debug/dri/0/mob_ttm even when the corresponding ttm_resource_manager is not allocated. This leads to a crash when trying to read from this file.
Add a check to create mob_ttm, system_mob_ttm, and gmr_ttm debug file only when the corresponding ttm_resource_manager is allocated.
crash> bt PID: 3133409 TASK: ffff8fe4834a5000 CPU: 3 COMMAND: "grep" #0 [ffffb954506b3b20] machine_kexec at ffffffffb2a6bec3 #1 [ffffb954506b3b78] __crash_kexec at ffffffffb2bb598a #2 [ffffb954506b3c38] crash_kexec at ffffffffb2bb68c1 #3 [ffffb954506b3c50] oops_end at ffffffffb2a2a9b1 #4 [ffffb954506b3c70] no_context at ffffffffb2a7e913 #5 [ffffb954506b3cc8] __bad_area_nosemaphore at ffffffffb2a7ec8c #6 [ffffb954506b3d10] do_page_fault at ffffffffb2a7f887 #7 [ffffb954506b3d40] page_fault at ffffffffb360116e [exception RIP: ttm_resource_manager_debug+0x11] RIP: ffffffffc04afd11 RSP: ffffb954506b3df0 RFLAGS: 00010246 RAX: ffff8fe41a6d1200 RBX: 0000000000000000 RCX: 0000000000000940 RDX: 0000000000000000 RSI: ffffffffc04b4338 RDI: 0000000000000000 RBP: ffffb954506b3e08 R8: ffff8fee3ffad000 R9: 0000000000000000 R10: ffff8fe41a76a000 R11: 0000000000000001 R12: 00000000ffffffff R13: 0000000000000001 R14: ffff8fe5bb6f3900 R15: ffff8fe41a6d1200 ORIG_RAX: ffffffffffffffff CS: 0010 SS: 0018 #8 [ffffb954506b3e00] ttm_resource_manager_show at ffffffffc04afde7 [ttm] #9 [ffffb954506b3e30] seq_read at ffffffffb2d8f9f3 RIP: 00007f4c4eda8985 RSP: 00007ffdbba9e9f8 RFLAGS: 00000246 RAX: ffffffffffffffda RBX: 000000000037e000 RCX: 00007f4c4eda8985 RDX: 000000000037e000 RSI: 00007f4c41573000 RDI: 0000000000000003 RBP: 000000000037e000 R8: 0000000000000000 R9: 000000000037fe30 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f4c41573000 R13: 0000000000000003 R14: 00007f4c41572010 R15: 0000000000000003 ORIG_RAX: 0000000000000000 CS: 0033 SS: 002b
{
"affected": [],
"aliases": [
"CVE-2024-26940"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2024-05-01T06:15:09Z",
"severity": null
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/vmwgfx: Create debugfs ttm_resource_manager entry only if needed\n\nThe driver creates /sys/kernel/debug/dri/0/mob_ttm even when the\ncorresponding ttm_resource_manager is not allocated.\nThis leads to a crash when trying to read from this file.\n\nAdd a check to create mob_ttm, system_mob_ttm, and gmr_ttm debug file\nonly when the corresponding ttm_resource_manager is allocated.\n\ncrash\u003e bt\nPID: 3133409 TASK: ffff8fe4834a5000 CPU: 3 COMMAND: \"grep\"\n #0 [ffffb954506b3b20] machine_kexec at ffffffffb2a6bec3\n #1 [ffffb954506b3b78] __crash_kexec at ffffffffb2bb598a\n #2 [ffffb954506b3c38] crash_kexec at ffffffffb2bb68c1\n #3 [ffffb954506b3c50] oops_end at ffffffffb2a2a9b1\n #4 [ffffb954506b3c70] no_context at ffffffffb2a7e913\n #5 [ffffb954506b3cc8] __bad_area_nosemaphore at ffffffffb2a7ec8c\n #6 [ffffb954506b3d10] do_page_fault at ffffffffb2a7f887\n #7 [ffffb954506b3d40] page_fault at ffffffffb360116e\n [exception RIP: ttm_resource_manager_debug+0x11]\n RIP: ffffffffc04afd11 RSP: ffffb954506b3df0 RFLAGS: 00010246\n RAX: ffff8fe41a6d1200 RBX: 0000000000000000 RCX: 0000000000000940\n RDX: 0000000000000000 RSI: ffffffffc04b4338 RDI: 0000000000000000\n RBP: ffffb954506b3e08 R8: ffff8fee3ffad000 R9: 0000000000000000\n R10: ffff8fe41a76a000 R11: 0000000000000001 R12: 00000000ffffffff\n R13: 0000000000000001 R14: ffff8fe5bb6f3900 R15: ffff8fe41a6d1200\n ORIG_RAX: ffffffffffffffff CS: 0010 SS: 0018\n #8 [ffffb954506b3e00] ttm_resource_manager_show at ffffffffc04afde7 [ttm]\n #9 [ffffb954506b3e30] seq_read at ffffffffb2d8f9f3\n RIP: 00007f4c4eda8985 RSP: 00007ffdbba9e9f8 RFLAGS: 00000246\n RAX: ffffffffffffffda RBX: 000000000037e000 RCX: 00007f4c4eda8985\n RDX: 000000000037e000 RSI: 00007f4c41573000 RDI: 0000000000000003\n RBP: 000000000037e000 R8: 0000000000000000 R9: 000000000037fe30\n R10: 0000000000000000 R11: 0000000000000246 R12: 00007f4c41573000\n R13: 0000000000000003 R14: 00007f4c41572010 R15: 0000000000000003\n ORIG_RAX: 0000000000000000 CS: 0033 SS: 002b",
"id": "GHSA-cfg9-pfwm-v8pc",
"modified": "2024-05-01T06:31:41Z",
"published": "2024-05-01T06:31:41Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2024-26940"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/016119154981d81c9e8f2ea3f56b9e2b4ea14500"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/042ef0afc40fa1a22b3608f22915b91ce39d128f"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/25e3ce59c1200f1f0563e39de151f34962ab0fe1"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/4be9075fec0a639384ed19975634b662bfab938f"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/eb08db0fc5354fa17b7ed66dab3c503332423451"
}
],
"schema_version": "1.4.0",
"severity": []
}