[Crash-utility] Crash support for kASLR

[Andrew Honig]

I'm trying to add crash support for kdumps from kASLR'd kernels.  I've
got it working with a few small changes and I wanted to solicit
comments before sending a patch.

1) The --reloc flag appears to specify an offset to be subtracted from
the loaded address, when the aslr offset is added.  It's annoying to
try to specify negative numbers on the command line, so I'd like to
add another argument --aslr which is the same as --reloc but negates
the value.

2) There are some symbols which should not be relocated.  Specifically
the per_cpu section symbols are zero based offsets which should not
have the offset apply.  Additionally there are VDSO symbols which are
fixed even with kASLR enabled.  To fix this I'd like to add code to
iterate through the section and find the end of the last section and
only apply the relocation value to values after the start of text but
before the end of the last section.

thanks,
Andy