iOS Kernel Heap Armageddon - Hakim
iOS Kernel Heap Armageddon - Hakim iOS Kernel Heap Armageddon - Hakim
zprint vs. iOS 6 • zprint is based on the host_zone_info / mach_zone_info • in iOS 6 Apple has locked down this API with PE_I_can_haz_debugger • can only be used on jailbroken devices (or Apple‘s own debugging hardware) • no longer usable for kernel heap exploits Stefan Esser • iOS Kernel Heap Armageddon REVISITED • July 2012 • 8
iOS Kernel Zone Allocator 101 • kernel heap is divided into so called zones • each zone starts with a first chunk of memory (usually 1 page) 0x000 0x1000 Stefan Esser • iOS Kernel Heap Armageddon REVISITED • July 2012 • 9
- 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: Some Kernel Zones $ zprint kalloc e
- 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 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 37 and 38: Visualization of Zone Page Allocati
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<strong>iOS</strong> <strong>Kernel</strong> Zone Allocator 101<br />
• kernel heap is divided into so called zones<br />
• each zone starts with a first chunk of memory (usually 1 page)<br />
0x000<br />
0x1000<br />
Stefan Esser • <strong>iOS</strong> <strong>Kernel</strong> <strong>Heap</strong> <strong>Armageddon</strong> REVISITED • July 2012 •<br />
9
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