iOS Kernel Heap Armageddon - Hakim
iOS Kernel Heap Armageddon - Hakim iOS Kernel Heap Armageddon - Hakim
Let‘s have a look at kalloc() Stefan Esser • iOS Kernel Heap Armageddon REVISITED • July 2012 • 18
kalloc() • kalloc() is a wrapper around zalloc() and kmem_alloc() • it adds no additional heap meta data • caller needs to keep track of allocated size • for small requests zalloc() is used • for bigger requests kmem_alloc() is used • kalloc() registers several zones with names like kalloc.* Stefan Esser • iOS Kernel Heap Armageddon REVISITED • July 2012 • 19
- 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 and 10: iOS Kernel Zone Allocator 101 • k
- Page 11 and 12: iOS Kernel Zone Allocator 101 • z
- Page 13 and 14: iOS Kernel Zone Allocator 101 • w
- Page 15 and 16: Exploiting the freelist in iOS 6
- Page 17: Overview Managers and Wrappers not
- 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 37 and 38: Visualization of Zone Page Allocati
- Page 39 and 40: Visualization of Zone Page Allocati
- Page 41 and 42: Visualization of Zone Page Allocati
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- Page 49 and 50: Visualization of Zone Page Allocati
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- 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
Let‘s have a look at kalloc()<br />
Stefan Esser • <strong>iOS</strong> <strong>Kernel</strong> <strong>Heap</strong> <strong>Armageddon</strong> REVISITED • July 2012 •<br />
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