CVE-2023-53625

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> drm/i915/gvt: fix vgpu debugfs clean in remove<br /> <br /> Check carefully on root debugfs available when destroying vgpu,<br /> e.g in remove case drm minor&amp;#39;s debugfs root might already be destroyed,<br /> which led to kernel oops like below.<br /> <br /> Console: switching to colour dummy device 80x25<br /> i915 0000:00:02.0: MDEV: Unregistering<br /> intel_vgpu_mdev b1338b2d-a709-4c23-b766-cc436c36cdf0: Removing from iommu group 14<br /> BUG: kernel NULL pointer dereference, address: 0000000000000150<br /> PGD 0 P4D 0<br /> Oops: 0000 [#1] PREEMPT SMP<br /> CPU: 3 PID: 1046 Comm: driverctl Not tainted 6.1.0-rc2+ #6<br /> Hardware name: HP HP ProDesk 600 G3 MT/829D, BIOS P02 Ver. 02.44 09/13/2022<br /> RIP: 0010:__lock_acquire+0x5e2/0x1f90<br /> Code: 87 ad 09 00 00 39 05 e1 1e cc 02 0f 82 f1 09 00 00 ba 01 00 00 00 48 83 c4 48 89 d0 5b 5d 41 5c 41 5d 41 5e 41 5f c3 45 31 ff 81 3f 60 9e c2 b6 45 0f 45 f8 83 fe 01 0f 87 55 fa ff ff 89 f0<br /> RSP: 0018:ffff9f770274f948 EFLAGS: 00010046<br /> RAX: 0000000000000003 RBX: 0000000000000000 RCX: 0000000000000000<br /> RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000150<br /> RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000<br /> R10: ffff8895d1173300 R11: 0000000000000001 R12: 0000000000000000<br /> R13: 0000000000000150 R14: 0000000000000000 R15: 0000000000000000<br /> FS: 00007fc9b2ba0740(0000) GS:ffff889cdfcc0000(0000) knlGS:0000000000000000<br /> CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033<br /> CR2: 0000000000000150 CR3: 000000010fd93005 CR4: 00000000003706e0<br /> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000<br /> DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400<br /> Call Trace:<br /> <br /> lock_acquire+0xbf/0x2b0<br /> ? simple_recursive_removal+0xa5/0x2b0<br /> ? lock_release+0x13d/0x2d0<br /> down_write+0x2a/0xd0<br /> ? simple_recursive_removal+0xa5/0x2b0<br /> simple_recursive_removal+0xa5/0x2b0<br /> ? start_creating.part.0+0x110/0x110<br /> ? _raw_spin_unlock+0x29/0x40<br /> debugfs_remove+0x40/0x60<br /> intel_gvt_debugfs_remove_vgpu+0x15/0x30 [kvmgt]<br /> intel_gvt_destroy_vgpu+0x60/0x100 [kvmgt]<br /> intel_vgpu_release_dev+0xe/0x20 [kvmgt]<br /> device_release+0x30/0x80<br /> kobject_put+0x79/0x1b0<br /> device_release_driver_internal+0x1b8/0x230<br /> bus_remove_device+0xec/0x160<br /> device_del+0x189/0x400<br /> ? up_write+0x9c/0x1b0<br /> ? mdev_device_remove_common+0x60/0x60 [mdev]<br /> mdev_device_remove_common+0x22/0x60 [mdev]<br /> mdev_device_remove_cb+0x17/0x20 [mdev]<br /> device_for_each_child+0x56/0x80<br /> mdev_unregister_parent+0x5a/0x81 [mdev]<br /> intel_gvt_clean_device+0x2d/0xe0 [kvmgt]<br /> intel_gvt_driver_remove+0x2e/0xb0 [i915]<br /> i915_driver_remove+0xac/0x100 [i915]<br /> i915_pci_remove+0x1a/0x30 [i915]<br /> pci_device_remove+0x31/0xa0<br /> device_release_driver_internal+0x1b8/0x230<br /> unbind_store+0xd8/0x100<br /> kernfs_fop_write_iter+0x156/0x210<br /> vfs_write+0x236/0x4a0<br /> ksys_write+0x61/0xd0<br /> do_syscall_64+0x55/0x80<br /> ? find_held_lock+0x2b/0x80<br /> ? lock_release+0x13d/0x2d0<br /> ? up_read+0x17/0x20<br /> ? lock_is_held_type+0xe3/0x140<br /> ? asm_exc_page_fault+0x22/0x30<br /> ? lockdep_hardirqs_on+0x7d/0x100<br /> entry_SYSCALL_64_after_hwframe+0x46/0xb0<br /> RIP: 0033:0x7fc9b2c9e0c4<br /> Code: 15 71 7d 0d 00 f7 d8 64 89 02 48 c7 c0 ff ff ff ff eb b7 0f 1f 00 f3 0f 1e fa 80 3d 3d 05 0e 00 00 74 13 b8 01 00 00 00 0f 05 3d 00 f0 ff ff 77 54 c3 0f 1f 00 48 83 ec 28 48 89 54 24 18 48<br /> RSP: 002b:00007ffec29c81c8 EFLAGS: 00000202 ORIG_RAX: 0000000000000001<br /> RAX: ffffffffffffffda RBX: 000000000000000d RCX: 00007fc9b2c9e0c4<br /> RDX: 000000000000000d RSI: 0000559f8b5f48a0 RDI: 0000000000000001<br /> RBP: 0000559f8b5f48a0 R08: 0000559f8b5f3540 R09: 00007fc9b2d76d30<br /> R10: 0000000000000000 R11: 0000000000000202 R12: 000000000000000d<br /> R13: 00007fc9b2d77780 R14: 000000000000000d R15: 00007fc9b2d72a00<br /> <br /> Modules linked in: sunrpc intel_rapl_msr intel_rapl_common intel_pmc_core_pltdrv intel_pmc_core intel_tcc_cooling x86_pkg_temp_thermal intel_powerclamp coretemp kvm_intel ee1004 igbvf rapl vfat fat intel_cstate intel_uncore pktcdvd i2c_i801 pcspkr wmi_bmof i2c_smbus acpi_pad vfio_pci vfio_pci_core vfio_virqfd zram fuse dm<br /> ---truncated---