iOS Kernel Heap Armageddon - Hakim

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iOS Kernel Zone Allocator 101 • each zone is divided into memory blocks of the same size • all memory allocated within a zone will have the same block size 0x000 0x200 0x400 0x600 0x800 0xA00 0xC00 0xE00 0x1000 Stefan Esser • iOS Kernel Heap Armageddon REVISITED • July 2012 • 10
iOS Kernel Zone Allocator 101 • zone allocator keeps inbound heap meta data • first 4 bytes of a free block is a pointer to another free block 0x000 0x200 0x400 0x600 0x800 0xA00 0xC00 0xE00 0x1000 Stefan Esser • iOS Kernel Heap Armageddon REVISITED • July 2012 • 11
Page 1 and 2: http://www.sektioneins.de iOS Kerne
Page 3 and 4: DISCLAIMER iOS 6 • is in beta =>
Page 5 and 6: So what is this talk about? • zon
Page 7 and 8: Some Kernel Zones $ zprint kalloc e
Page 9: iOS Kernel Zone Allocator 101 • k
Page 13 and 14: iOS Kernel Zone Allocator 101 • w
Page 15 and 16: Exploiting the freelist in iOS 6
Page 17 and 18: Overview Managers and Wrappers not
Page 19 and 20: kalloc() • kalloc() is a wrapper
Page 21 and 22: kfree() • kfree() is a bit specia
Page 23 and 24: _MALLOC() • _MALLOC() is a wrappe
Page 25 and 26: _MALLOC() in iOS 5.x void *_MALLOC(
Page 27 and 28: What about kern_os_malloc(), new an
Page 29 and 30: mcache / slab could and might fill
Page 31 and 32: kernel_memory_allocate • “maste
Page 33 and 34: Cross Zone Attacks • what is the
Page 35 and 36: Visualization of Zone Page Allocati
Page 61 and 62:
Zone Page Allocation Distribution (
Page 63 and 64:
Cross Memory Allocator Attacks •
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iOS Kernel C++ • iOS kernel‘s l
Page 67 and 68:
OSObject Memory Layout 0x00 0x04 vt
Page 69 and 70:
Overwriting an OSObject in Memory
Page 71 and 72:
OSArray Memory Layout and Overwriti
Page 73 and 74:
“Generic“ Technique to control
Page 75 and 76:
Heap Feng Shui / Heap Massage / ...
Page 77 and 78:
OSUnserializeXML() • deserializat
Page 79 and 80:
How does the parser work? (II) •
Page 81 and 82:
How does the parser work? (IV) •
Page 83 and 84:
How does the parser work? (VI) •
Page 85 and 86:
How does the parser work? (VIII)
Page 87 and 88:
Heap Spraying (Remember?) • alloc
Page 89 and 90:
Heap Spraying • allocate repeated
Page 91 and 92:
Heap Spraying • allocate repeated
Page 93 and 94:
Fill Arbitrary Sized Memory Blocks
Page 95 and 96:
Poking Holes into Allocated Data
Page 97 and 98:
Extra: Keeping Data Allocated • s
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iOS Kernel Heap Armageddon - Hakim

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