Messages in this thread | | | Subject | LKPK (Live Kernel Patching Kit) | Date | Sat, 25 Jul 1998 15:52:14 -0400 | From | Adam Sulmicki <> |
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Hello,
I'm currently writing an LKPK. The idea is that you can "patch" your running kernel against an kernel bug and you can continue run your mission critical server without having to reboot machine.
Another use for it, is when you debug/develop something kernel related what is not and/or cannot be modularized. As LKPK allows you modularize given function(s) using "brute force". So you can test as many version and as many times as you want without having to recompile kernel and reboot.
All you need is valid System.map
I have currnetly working proof-of-concept for the off-by-one bug. It works really nicely. All you have to do is just d/l the patch and type 'make patch-obo' and if you for some reasons don't want it anymore just type 'make un-patch-obo'.
However, while I'm trying to write patch to the SIGIO bug, I came acorss an problem.
I can assign specific address to ptrs to variable. However, HOW can I make _variable_ to be at given address?
Same with function, I can make ptr to specific function and I can assig it specific address. But, HOW can I declare function and make it start at specific adreess?
Anyone?
Thanks, -Adam PS:
I'll post URL to LKPK soon, I just hope to have it first working with several examples of patching kernel and replacing functions for deubgging.
Code is already highly modularized, so that it is pretty easy to fix another bug using LKPK.
Finally, I still need to write better detection that the System.map which it has found is the valid one.
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