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Mon, 12 Feb 2007

Fun with kernel.


Instead of read some doc about inline gcc syntax (and mainly to understand what does it mean "movl %%gs:0, %0" and why it faults for %%ds) I write a module which will allow to dump GDT on demand - this will allow to check my hypotesis about segment address dereferencing idea described previously.

Well, actually I read a lot of inline asm docs for the last several days, namely following (for interested reader - that is mostly small howtos and simple examples):

• Getting rid of SIGSEGV - for fun but not for profit. Phrack 58.
• A Guide to Programming Pentium/Pentium Pro Processors
• Intel x86 Function-call Conventions - Assembly View
• The Frame Pointer Overwrite. Phrack 55
• Clutching at straws: When you can shift the stack pointer. Phrack 63
• GCC-Inline-Assembly-HOWTO
• Inline assembly for x86 in Linux
• Using Assembly Language in Linux.
• Smashing The Stack For Fun And Profit. Phrack 49 (hacker's bible)
• various ELF and x86 hardware ABI mails and descriptions

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