binary patching kernels (ip_frag bug)

C. Scott Ananian (cananian@lcs.mit.edu)
Sun, 19 Apr 1998 00:41:36 -0400 (EDT)

With regards to the 'load a binary modules and fix the ip_frag bug'
thread:
What you really want to do is get a function pointer to ip_glue()
(relying on modprobe to resolve the address) and poke the bytes beginning
at ((char *)ip_glue) with a JMP to ip_glue_new, your replacement. (The
return in ip_glue_new will then effect the return of ip_glue.)

This doesn't work if ip_glue isn't exported to module-land, of course, but
if symbols aren't exported we could have a whole heap of problems.
--Scott
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