[seL4] x86 seL4 kernel bug - kernel page faults on seL4_VMEnter

-- Alexander Boettcher Genode Labs https://www.genode-labs.com - https://www.genode.org Genode Labs GmbH - Amtsgericht Dresden - HRB 28424 - Sitz Dresden Geschäftsführer: Dr.-Ing. Norman Feske, Christian Helmuth diff --git a/src/arch/x86/object/vcpu.c b/src/arch/x86/object/vcpu.c index cf74fa4..68a1dca 100644 --- a/src/arch/x86/object/vcpu.c +++ b/src/arch/x86/object/vcpu.c @@ -1540,6 +1540,7 @@ restoreVMCS(void) } #ifndef CONFIG_KERNEL_SKIM_WINDOW + userError("opps expected_vmcs=%p", expected_vmcs); if (getCurrentCR3().words[0] != expected_vmcs->last_host_cr3) { expected_vmcs->last_host_cr3 = getCurrentCR3().words[0]; vmwrite(VMX_HOST_CR3, getCurrentCR3().words[0]); Boot config: parsing cmdline '/boot/sel4 disable_iommu' Boot config: console_port = 0x1808 Boot config: debug_port = 0x1808 Boot config: disable_iommu = true Detected 1 boot module(s): module #0: start=0xfd58000 end=0xffff330 size=0x2a7330 name='/boot/image.elf' Parsing GRUB physical memory map Physical Memory Region from 0 size 89400 type 1 Physical Memory Region from 89400 size 16c00 type 2 Physical Memory Region from d2000 size 2000 type 2 Physical Memory Region from dc000 size 24000 type 2 Physical Memory Region from 100000 size bb17c000 type 1 Adding physical memory region 0x100000-0xbb27c000 Physical Memory Region from bb27c000 size 6000 type 2 Physical Memory Region from bb282000 size dd000 type 1 Adding physical memory region 0xbb282000-0xbb35f000 Physical Memory Region from bb35f000 size 12000 type 2 Physical Memory Region from bb371000 size 81000 type 4 Physical Memory Region from bb3f2000 size 1d000 type 2 Physical Memory Region from bb40f000 size 60000 type 1 Adding physical memory region 0xbb40f000-0xbb46f000 Physical Memory Region from bb46f000 size 1f9000 type 2 Physical Memory Region from bb668000 size 80000 type 4 Physical Memory Region from bb6e8000 size 27000 type 2 Physical Memory Region from bb70f000 size 8000 type 1 Adding physical memory region 0xbb70f000-0xbb717000 Physical Memory Region from bb717000 size 8000 type 2 Physical Memory Region from bb71f000 size 4c000 type 1 Adding physical memory region 0xbb71f000-0xbb76b000 Physical Memory Region from bb76b000 size c000 type 4 Physical Memory Region from bb777000 size 3000 type 3 Physical Memory Region from bb77a000 size 7000 type 4 Physical Memory Region from bb781000 size 1000 type 3 Physical Memory Region from bb782000 size 9000 type 4 Physical Memory Region from bb78b000 size 1000 type 3 Physical Memory Region from bb78c000 size 13000 type 4 Physical Memory Region from bb79f000 size 60000 type 3 Physical Memory Region from bb7ff000 size 1000 type 1 Adding physical memory region 0xbb7ff000-0xbb800000 Physical Memory Region from bb800000 size 800000 type 2 Physical Memory Region from bc000000 size 4000000 type 2 Physical Memory Region from e0000000 size 10000000 type 2 Physical Memory Region from feaff000 size 1000 type 2 Physical Memory Region from fec00000 size 10000 type 2 Physical Memory Region from fed00000 size 400 type 2 Physical Memory Region from fed1c000 size 4000 type 2 Physical Memory Region from fed20000 size 70000 type 2 Physical Memory Region from fee00000 size 1000 type 2 Physical Memory Region from ff000000 size 1000000 type 2 Physical Memory Region from 100000000 size 38000000 type 1 Adding physical memory region 0x100000000-0x138000000 Multiboot gave us no video information ACPI: RSDP paddr=0xf68e0 ACPI: RSDP vaddr=0xf68e0 ACPI: RSDT paddr=0xbb7f07a2 ACPI: RSDT vaddr=0xbb7f07a2 ***WARNING*** SKIM window not enabled, this machine is probably vulernable to Meltdown (https://www.meltdownattack.com), consider enabling Kernel loaded to: start=0x200000 end=0xaa5000 size=0x8a5000 entry=0x201209 ACPI: RSDT paddr=0xbb7f07a2 ACPI: RSDT vaddr=0xbb7f07a2 ACPI: FADT paddr=0xbb7f0a00 ACPI: FADT vaddr=0xbb7f0a00 ACPI: FADT flags=0xc2ad ACPI: MADT paddr=0xbb7feb45 ACPI: MADT vaddr=0xbb7feb45 ACPI: MADT apic_addr=0xfee00000 ACPI: MADT flags=0x1 ACPI: MADT_APIC apic_id=0x0 ACPI: MADT_APIC apic_id=0x1 ACPI: MADT_APIC apic_id=0x4 ACPI: MADT_APIC apic_id=0x5 ACPI: MADT_IOAPIC ioapic_id=1 ioapic_addr=0xfec00000 gsib=0 ACPI: MADT_ISO bus=0 source=0 gsi=2 flags=0x0 ACPI: MADT_ISO bus=0 source=9 gsi=9 flags=0xd ACPI: 4 CPU(s) detected ELF-loading userland images from boot modules: size=0x110f000 v_entry=0x2000018 v_start=0x2000000 v_end=0x310f000 p_start=0x10000000 p_end=0x1110f000 Moving loaded userland images to final location: from=0x10000000 to=0xaa5000 size=0x110f000 Starting node #0 with APIC ID 0 Mapping kernel window is done Starting node #1 with APIC ID 1 Starting node #2 with APIC ID 4 Starting node #3 with APIC ID 5 Booting all finished, dropped to user space virtual address layout of core: overall [0000000000002000,00000000c0000000) core image [0000000002000000,000000000310f000) ipc buffer [000000000310f000,0000000003110000) boot_info [0000000003110000,0000000003112000) stack area [0000000040000000,0000000050000000) boot module 'timer' (113344 bytes) boot module 'test-vmm_sel4' (9912 bytes) boot module 'config' (609 bytes) boot module 'ld.lib.so' (937616 bytes) boot module 'init' (352672 bytes) Genode sculpt_vc-2-ge2fd5e5 2909 MiB RAM and 261141 caps assigned to init ... <<seL4(CPU 0) [restoreVMCS/1543 T0xffffff80ba295400 "child of: 'child of: 'rootserver''" @10000c9]: opps _expected_vmcs_=(nil)>> ========== KERNEL EXCEPTION ========== Vector: 0xe ErrCode: 0x0 IP: 0xffffffff80835236 SP: 0xffffffff8087ef18 FLAGS: 0x10086 CR0: 0x8001003b CR2: 0x3298 (page-fault address) CR3: 0xba043000 (page-directory physical address) CR4: 0x6620 Stack Dump: *0xffffffff8087ef18 == 0x10000c9 *0xffffffff8087ef20 == 0xffffffff80a93000 *0xffffffff8087ef28 == 0xffffffff80890040 *0xffffffff8087ef30 == 0x40 *0xffffffff8087ef38 == 0xffffff80ba295400 *0xffffffff8087ef40 == 0xffffffff8087efb8 *0xffffffff8087ef48 == 0xffffffffffffffe7 *0xffffffff8087ef50 == 0xffffffff80a93000 *0xffffffff8087ef58 == 0xffffffff80a93000 *0xffffffff8087ef60 == 0x0 *0xffffffff8087ef68 == 0x0 *0xffffffff8087ef70 == 0xffffffff80890040 *0xffffffff8087ef78 == 0xffffffffffffffff *0xffffffff8087ef80 == 0xffffffff808357fe *0xffffffff8087ef88 == 0xffffffff80a93000 *0xffffffff8087ef90 == 0xffffffff80838c93 *0xffffffff8087ef98 == 0x1001d4 *0xffffffff8087efa0 == 0x0 *0xffffffff8087efa8 == 0xffffffffffffffe7 *0xffffffff8087efb0 == 0xffffffff80839982 Halting... halting... Kernel entry via Interrupt, irq 157