BATTLE OF SKM AND IUM

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STORAGE BLOBS • Secure Communications Channel between different IUM Trustlets with the same Instance GUID • Each Trustlet Instance has 2 Storage IDs • Each Storage ID can have an one of Storage Blob of up to 4088 bytes • The rest is used up by a header, for a total of 1 page • A Trustlet can get only Storage Blobs that belong to its own Instance GUID • All Storage Blobs are in a system-wide LIST_ENTRY called BlobList • Given the SKM Capability model we just saw, this means that Trustlet 3 can push data for the Instance GUID it manages, and Trustlet 2 can read data • We’ll shortly see why mailboxes and storage blobs exist – they are specialized for a particular purpose
SECURE MODE CALLS • Secure Mode Calls are services that SK provides to NTOS • NTOS uses the SkCallSecureMode routine and passes a special structure that identifies • The Operation Code • The Service Code • Three operations are possible • Resume Thread [0] • Secure Service Call [1] • TLB Flush [2] • This puts the CPU into VTL 1 and executes the handler for VTL which will run in SKM • VTL 0->1 Switch is done with VMCALL instruction, RCX == 0x11 (RCX is saved into RAX)
Page 1 and 2: BATTLE OF SKM AND IUM HOW WINDOWS 1
Page 3 and 4: PRESENTATION OVERVIEW • Microsoft
Page 5 and 6: VBS FEATURES IN WINDOWS 10 / SERVER
Page 7 and 8: ENABLING VBS
Page 9 and 10: HOW DOES IT ALL WORK? • Hyperviso
Page 11 and 12: SEPARATION OF ROLES • Instead of
Page 13 and 14: PLATFORM REQUIREMENTS • The Boot
Page 15 and 16: HARD CODE GUARANTEES • When hard
Page 17 and 18: VIRTUAL SECURE MODE (VSM) BOOTSTRAP
Page 19 and 20: SKM LAUNCH • To initialize VTL 1,
Page 21 and 22: BCD VSM POLICY OPTIONS • The poli
Page 23 and 24: SKM INTERNALS
Page 25 and 26: SKM STRUCTURES • SKM has a PCR at
Page 27: SKM CAPABILITIES • The SkCapabili
Page 31 and 32: SPECIALIZED SECURE MORE SERVICE CAL
Page 33 and 34: NORMAL MODE SERVICE CALLS • SK ne
Page 35 and 36: IUM INTERNALS
Page 37 and 38: SECURE SYSTEM CALLS • SKM exposes
Page 39 and 40: SECURE BASE API • Trustlets shoul
Page 41 and 42: NOTABLY MISSING… • Trustlets ca
Page 43 and 44: NORMAL MODE SYSTEM CALL PROXYING Th
Page 45 and 46: LAUNCHING A TRUSTLET • Process At
Page 47 and 48: EXAMPLE IUM-COMPLIANT SIGNED BINARY
Page 49 and 50: TRUSTLET INSTANCE GUID • Trustlet
Page 51 and 52: LSA TRUSTLET • One of the two inb
Page 53 and 54: LOADING A TRUSTLET • Ldr, or the
Page 55 and 56: TRUSTLET TO NORMAL WORLD COMMUNICAT
Page 57 and 58: CAN WE BUILD OUR OWN TRUSTLETS? •
Page 59 and 60: CONCLUSION RISKS AND THOUGHTS
Page 61 and 62: SECURE KERNEL COMPLEXITY / ATTACK S
Page 63 and 64: VSM WITHOUT SECUREBOOT • What’s
Page 65: YOU HAVE QUESTIONS? I HOPEFULLY HAV

BATTLE OF SKM AND IUM

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