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Re: Finding symbols in loaded kexts


On Aug 6, 2007, at 9:58 AM, Andrew Gallatin wrote:
Dean Reece writes: 
If the symbol you want is not global (lower-case type specifier in
the nm output), or has been stripped out of the target kext entirely,
then there isn't really anything you can do.


If the symbol is not global, but still present, would it work to call
it via a function pointer initialized to the correct address?  Eg,
does the "global" property mean anything once the module is relocated?

All that "global" means is that it's available to modules linking with it, in this context.

I vaguely remember a trick somebody here used to play with Linux.
There was some function that wasn't exported that his module needed to
call.  So he had a wrapper script for his module that groveled around
in kernel memory to find the function, then passed its address to his
module, which used it in a function pointer.  I don't remember if it
was global or non global though..

Yes, lots of people have done lots of bad and ugly things. Not a good reason to emulate them... 8)

 = Mike
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References: 
 >Finding symbols in loaded kexts (From: Ryan Govostes <email@hidden>)
 >Re: Finding symbols in loaded kexts (From: Dean Reece <email@hidden>)
 >Re: Finding symbols in loaded kexts (From: Andrew Gallatin <email@hidden>)



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