191 lines
10 KiB
ReStructuredText
191 lines
10 KiB
ReStructuredText
============
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XEN and MIB3
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============
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partitions
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----------
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The contents of the partitions taken from a chipoff. There's a large IVI partition containing partitions of its own.
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.. code:: bash
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(venv) ➜ MIB3 Top High mmls 32gb.bin
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GUID Partition Table (EFI)
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Offset Sector: 0
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Units are in 4096-byte sectors
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Slot Start End Length Description
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000: Meta 0000000000 0000000000 0000000001 Safety Table
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001: ------- 0000000000 0000000255 0000000256 Unallocated
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002: Meta 0000000001 0000000001 0000000001 GPT Header
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003: Meta 0000000002 0000000005 0000000004 Partition Table
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004: 000 0000000256 0000002815 0000002560 boot_a
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005: 001 0000002816 0000005375 0000002560 boot_b
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006: 002 0000005376 0000005887 0000000512 hyp_a
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007: 003 0000005888 0000006143 0000000256 dtb_a
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008: 004 0000006144 0000009727 0000003584 kerneldom0_a
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009: 006 0000009728 0000012287 0000002560 initramfsdom0_a
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010: 007 0000012288 0000102911 0000090624 systemdom0_a
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011: 008 0000102912 0000109055 0000006144 system2dom0_a
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012: 012 0000109056 0000113919 0000004864 kerneldomu1_a
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013: 013 0000113920 0000114175 0000000256 dtbdomu1_a
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014: 014 0000114176 0000116735 0000002560 initramfsdomu1_a
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015: 015 0000116736 0000203775 0000087040 systemdomu1_a
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016: 016 0000203776 0000209919 0000006144 system2domu1_a
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017: 031 0000209920 0000210175 0000000256 align1
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018: 032 0000210176 0000210687 0000000512 hyp_b
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019: 033 0000210688 0000210943 0000000256 dtb_b
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020: 034 0000210944 0000214527 0000003584 kerneldom0_b
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021: 036 0000214528 0000217087 0000002560 initramfsdom0_b
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022: 037 0000217088 0000307711 0000090624 systemdom0_b
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023: 038 0000307712 0000313855 0000006144 system2dom0_b
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024: 042 0000313856 0000318719 0000004864 kerneldomu1_b
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025: 043 0000318720 0000318975 0000000256 dtbdomu1_b
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026: 044 0000318976 0000321535 0000002560 initramfsdomu1_b
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027: 045 0000321536 0000408575 0000087040 systemdomu1_b
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028: 046 0000408576 0000414719 0000006144 system2domu1_b
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029: 059 0000414720 0000418815 0000004096 system_error_dump
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030: 069 0000418816 0000420863 0000002048 sys_ss
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031: 070 0000420864 0000437247 0000016384 sys_persist
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032: 071 0000437248 0000453631 0000016384 sys_irc
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033: 072 0000453632 0000500735 0000047104 sys_misc1
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034: 099 0000500736 0001063935 0000563200 ivi_opt
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035: 100 0001063936 0007626751 0006562816 ivi
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036: ------- 0007626752 0007627775 0000001024 Unallocated
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TFFS is a proprietary file system from Tuxera, with one mounter available `tffsmount <https://github.com/NetherlandsForensicInstitute/tffsmount>`_, however, we had no success mounting this file system. Luckily, a fair bit of information can already be extracted from the binary by using a simple strings operation. In order to view the contents of a specific partition, it's best to extract and unzip the partitions of interest.
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.. code:: bash
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dd if=32gb.bin of=initramfsdom0_a.bin.gz skip=0000009728 count=2560 bs=4096
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gunzip initramfsdom0_a.bin.gz
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mkdir initramfsdom0_a
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mv initramfsdom0_a.bin initramfsdom0_a
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cd initramfsdom0_a
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cpio -idmv < initramfsdom0_a.bin
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Alternative approach (not working for partitions within the IVI).
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``python3 -m tffsmount 32gb.bin /tmp/mib3/tffsmount2 -o 0x1be00000``
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.. code:: bash
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➜ MIB3 Top High xxd 32gb.bin | grep .~.TFFS
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03000000: eb7e 9054 4646 5320 2020 2000 0000 0000 .~.TFFS .....
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03006000: eb7e 9054 4646 5320 2020 2000 0000 0000 .~.TFFS .....
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17755d40: eb7e 9054 4646 5320 2020 2000 0000 0000 .~.TFFS .....
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1c800000: eb7e 9054 4646 5320 2020 2000 0000 0000 .~.TFFS .....
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1c806000: eb7e 9054 4646 5320 2020 2000 0000 0000 .~.TFFS .....
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2d2b5d40: eb7e 9054 4646 5320 2020 2000 0000 0000 .~.TFFS .....
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35000000: eb7e 9054 4646 5320 2020 2000 0000 0000 .~.TFFS .....
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35006000: eb7e 9054 4646 5320 2020 2000 0000 0000 .~.TFFS .....
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49755d40: eb7e 9054 4646 5320 2020 2000 0000 0000 .~.TFFS .....
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4e800000: eb7e 9054 4646 5320 2020 2000 0000 0000 .~.TFFS .....
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4e806000: eb7e 9054 4646 5320 2020 2000 0000 0000 .~.TFFS .....
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5f2b5d40: eb7e 9054 4646 5320 2020 2000 0000 0000 .~.TFFS .....
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66400000: eb7e 9054 4646 5320 2020 2000 0000 0000 .~.TFFS .....
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66406000: eb7e 9054 4646 5320 2020 2000 0000 0000 .~.TFFS .....
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66c00000: eb7e 9054 4646 5320 2020 2000 0000 0000 .~.TFFS .....
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66c06000: eb7e 9054 4646 5320 2020 2000 0000 0000 .~.TFFS .....
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6ac00000: eb7e 9054 4646 5320 2020 2000 0000 0000 .~.TFFS .....
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6ac06000: eb7e 9054 4646 5320 2020 2000 0000 0000 .~.TFFS .....
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6ec00000: eb7e 9054 4646 5320 2020 2000 0000 0000 .~.TFFS .....
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6ec06000: eb7e 9054 4646 5320 2020 2000 0000 0000 .~.TFFS .....
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7a400000: eb7e 9054 4646 5320 2020 2000 0000 0000 .~.TFFS .....
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7a406000: eb7e 9054 4646 5320 2020 2000 0000 0000 .~.TFFS .....
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104000000: eb7e 9054 4646 5320 2020 2000 0000 0000 .~.TFFS .....
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104006000: eb7e 9054 4646 5320 2020 2000 0000 0000 .~.TFFS .....
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105974000: eb7e 9054 4646 5320 2020 2000 0000 0000 .~.TFFS .....
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10597a000: eb7e 9054 4646 5320 2020 2000 0000 0000 .~.TFFS .....
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129474000: eb7e 9054 4646 5320 2020 2000 0000 0000 .~.TFFS .....
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12947a000: eb7e 9054 4646 5320 2020 2000 0000 0000 .~.TFFS .....
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25fc00000: eb7e 9054 4646 5320 2020 2000 0000 0000 .~.TFFS .....
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25fc06000: eb7e 9054 4646 5320 2020 2000 0000 0000 .~.TFFS .....
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263c00000: eb7e 9054 4646 5320 2020 2000 0000 0000 .~.TFFS .....
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263c06000: eb7e 9054 4646 5320 2020 2000 0000 0000 .~.TFFS .....
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26fc00000: eb7e 9054 4646 5320 2020 2000 0000 0000 .~.TFFS .....
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26fc06000: eb7e 9054 4646 5320 2020 2000 0000 0000 .~.TFFS .....
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3afc00000: eb7e 9054 4646 5320 2020 2000 0000 0000 .~.TFFS .....
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3afc06000: eb7e 9054 4646 5320 2020 2000 0000 0000 .~.TFFS .....
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3dfc00000: eb7e 9054 4646 5320 2020 2000 0000 0000 .~.TFFS .....
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3dfc06000: eb7e 9054 4646 5320 2020 2000 0000 0000 .~.TFFS .....
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4dfc00000: eb7e 9054 4646 5320 2020 2000 0000 0000 .~.TFFS .....
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4dfc06000: eb7e 9054 4646 5320 2020 2000 0000 0000 .~.TFFS .....
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545400000: eb7e 9054 4646 5320 2020 2000 0000 0000 .~.TFFS .....
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545406000: eb7e 9054 4646 5320 2020 2000 0000 0000 .~.TFFS .....
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745400000: eb7e 9054 4646 5320 2020 2000 0000 0000 .~.TFFS .....
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745406000: eb7e 9054 4646 5320 2020 2000 0000 0000 .~.TFFS .....
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Perceived boot order: boot_a, then hypervisor via hyp_a. dtb_a could be the device tree blob, providing information of/on hardware devices. kerneldom0_a would be the primary kernel, with initramfs being the RAM disk for dom0.
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Domain0 and DomainU
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-------------------
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.. quote:: "Dom0 is the initial domain started by the Xen hypervisor on boot. Dom0 is an abbrevation of "Domain 0" (sometimes written as "domain zero" or the "host domain"). Dom0 is a privileged domain that starts first and manages the DomU unprivileged domains. The Xen hypervisor is not usable without Dom0. This is essentially the "host" operating system (or a "service console", if you prefer). As a result, Dom0 runs the Xen management toolstack, and has special privileges, like being able to access the hardware directly."
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Data can be shared between domains using XenStore - an information storage space between domains maintained by Xenstored.
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Dom0 is the only domain with direct access to hardware, with DomU being an unprivileged domain, which need to communicate with Dom0 to access hardware. Multiple DomU can be created.
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Sharing devices between Dom0 and DomU.
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.. quote:: "To access devices that are to be shared between domains, like the disks and network interfaces, the DomUs must communicate with Dom0. This is done by using a two-part driver. The FrontendDriver must be written for the OS used in the DomU, and uses XenBus, XenStore, shared pages, and event notifications to communicate with the BackendDriver, which lives in Dom0 and fulfils requests. To the applications and the rest of the kernel, the FrontendDriver just looks like a normal network interface, disk, or whatever. ""
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Wahrheit.
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XEN logs
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^^^^^^^^^^
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.. code:: bash
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<20><>Recovery mode
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=> Return value : 3oad LDFW
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S8=> Return value : 0
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Xen 4.8.0
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(XEN) [ 0.209091] [SB_ERR]Integrity check fail
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(XEN) [ 0.209119] [SB_ERR]verify_signature: binary ID = [0x10], return = [0x50E01]
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(XEN) [ 0.209128] Dom[1] Fail to auth the dtb binary, ret:331265
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(XEN) [ 0.209565] Dom[0] 2th, load kernel binary at 0000000081280000, 0000000000100000
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(XEN) [ 0.211313] Static RAM[00000008c0000000 ~ 000000097a000000] -> guest address [00000008c0000000 ~ 000000097a000000]
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(XEN) [ 0.226360]
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(XEN) [ 0.226360] ****************************************
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(XEN) [ 0.233678] Loading dom initrd from 0000000089200000 to 0x0000000089200000-0x0000000089340000
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(XEN) [ 0.237909] Dom[0] 3th, load kernel binary at 0000000081380000, 0000000000100000
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(XEN) [ 0.245791] DOM RAM Popluation of the pre-assigned range done. unassigned mem:0x 0000000000000000 Bytes
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(XEN) [ 0.253771] Panic on CPU 7:
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(XEN) [ 0.263057] Allocating PPI 16 for event channel interrupt
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(XEN) [ 0.274424] Dom[0] 4th, load kernel binary at 0000000081480000, 0000000000100000
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(XEN) [ 0.284998] Fail to auth the dtb binary
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(XEN) [ 0.291690] Loading dom0 DTB to 0x0000000089000000-0x000000008901e99e dtb_virt:0x0000000089000000
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(XEN) [ 0.302564] Dom[0] 5th, load kernel binary at 0000000081580000, 0000000000100000
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(XEN) [ 0.303995] ****************************************
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(XEN) [ 0.303995]
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(XEN) [ 0.313722] ___Dom0 construction done___
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(XEN) [ 0.324977] Dom[0] 6th, load kernel binary at 0000000081680000, 0000000000100000
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(XEN) [ 0.329844] Reboot in five seconds...
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(XEN) [ 0.346093] Dom[0] 7th, load kernel binary at 0000000081780000, 0000000000100000
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(XEN) [ 5.365817] exynos8890: keep scratch, 0xd (shutdown_code: 3) |