CVE-2024-35957

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> iommu/vt-d: Fix WARN_ON in iommu probe path<br /> <br /> Commit 1a75cc710b95 ("iommu/vt-d: Use rbtree to track iommu probed<br /> devices") adds all devices probed by the iommu driver in a rbtree<br /> indexed by the source ID of each device. It assumes that each device<br /> has a unique source ID. This assumption is incorrect and the VT-d<br /> spec doesn&amp;#39;t state this requirement either.<br /> <br /> The reason for using a rbtree to track devices is to look up the device<br /> with PCI bus and devfunc in the paths of handling ATS invalidation time<br /> out error and the PRI I/O page faults. Both are PCI ATS feature related.<br /> <br /> Only track the devices that have PCI ATS capabilities in the rbtree to<br /> avoid unnecessary WARN_ON in the iommu probe path. Otherwise, on some<br /> platforms below kernel splat will be displayed and the iommu probe results<br /> in failure.<br /> <br /> WARNING: CPU: 3 PID: 166 at drivers/iommu/intel/iommu.c:158 intel_iommu_probe_device+0x319/0xd90<br /> Call Trace:<br /> <br /> ? __warn+0x7e/0x180<br /> ? intel_iommu_probe_device+0x319/0xd90<br /> ? report_bug+0x1f8/0x200<br /> ? handle_bug+0x3c/0x70<br /> ? exc_invalid_op+0x18/0x70<br /> ? asm_exc_invalid_op+0x1a/0x20<br /> ? intel_iommu_probe_device+0x319/0xd90<br /> ? debug_mutex_init+0x37/0x50<br /> __iommu_probe_device+0xf2/0x4f0<br /> iommu_probe_device+0x22/0x70<br /> iommu_bus_notifier+0x1e/0x40<br /> notifier_call_chain+0x46/0x150<br /> blocking_notifier_call_chain+0x42/0x60<br /> bus_notify+0x2f/0x50<br /> device_add+0x5ed/0x7e0<br /> platform_device_add+0xf5/0x240<br /> mfd_add_devices+0x3f9/0x500<br /> ? preempt_count_add+0x4c/0xa0<br /> ? up_write+0xa2/0x1b0<br /> ? __debugfs_create_file+0xe3/0x150<br /> intel_lpss_probe+0x49f/0x5b0<br /> ? pci_conf1_write+0xa3/0xf0<br /> intel_lpss_pci_probe+0xcf/0x110 [intel_lpss_pci]<br /> pci_device_probe+0x95/0x120<br /> really_probe+0xd9/0x370<br /> ? __pfx___driver_attach+0x10/0x10<br /> __driver_probe_device+0x73/0x150<br /> driver_probe_device+0x19/0xa0<br /> __driver_attach+0xb6/0x180<br /> ? __pfx___driver_attach+0x10/0x10<br /> bus_for_each_dev+0x77/0xd0<br /> bus_add_driver+0x114/0x210<br /> driver_register+0x5b/0x110<br /> ? __pfx_intel_lpss_pci_driver_init+0x10/0x10 [intel_lpss_pci]<br /> do_one_initcall+0x57/0x2b0<br /> ? kmalloc_trace+0x21e/0x280<br /> ? do_init_module+0x1e/0x210<br /> do_init_module+0x5f/0x210<br /> load_module+0x1d37/0x1fc0<br /> ? init_module_from_file+0x86/0xd0<br /> init_module_from_file+0x86/0xd0<br /> idempotent_init_module+0x17c/0x230<br /> __x64_sys_finit_module+0x56/0xb0<br /> do_syscall_64+0x6e/0x140<br /> entry_SYSCALL_64_after_hwframe+0x71/0x79