iOS Kernel Heap Armageddon - Hakim
iOS Kernel Heap Armageddon - Hakim iOS Kernel Heap Armageddon - Hakim
Once Technique to rule them all... Audience meet OSUnserializeXML() Stefan Esser • iOS Kernel Heap Armageddon REVISITED • July 2012 • 76
OSUnserializeXML() • deserialization of iOS kernel base objects • used to pass objects from user space to kernel space (IOKit API) • data in XML .plist format • numbers, booleans, strings, data, dictionaries, arrays, sets and references IsThere one technique to rule them all? Answer Audience meet OSUnserializeXML() Stefan Esser • iOS Kernel Heap Armageddon REVISITED • July 2012 • 77
- 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 37 and 38: Visualization of Zone Page Allocati
- Page 39 and 40: Visualization of Zone Page Allocati
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- Page 53 and 54: Visualization of Zone Page Allocati
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- Page 57 and 58: Visualization of Zone Page Allocati
- Page 59 and 60: Visualization of Zone Page Allocati
- Page 61 and 62: Zone Page Allocation Distribution (
- Page 63 and 64: Cross Memory Allocator Attacks •
- Page 65 and 66: 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: Heap Feng Shui / Heap Massage / ...
- 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
OSUnserializeXML()<br />
• deserialization of <strong>iOS</strong> kernel base objects<br />
• used to pass objects from user space to kernel space (IOKit API)<br />
• data in XML .plist format<br />
• numbers, booleans, strings, data, dictionaries, arrays, sets and references<br />
<br />
<br />
IsThere<br />
one technique to rule them all?<br />
Answer<br />
<br />
Audience<br />
meet OSUnserializeXML()<br />
<br />
<br />
Stefan Esser • <strong>iOS</strong> <strong>Kernel</strong> <strong>Heap</strong> <strong>Armageddon</strong> REVISITED • July 2012 •<br />
77
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