[Crash-utility] [PATCH]: symbol filtering

[Per Fransson]

Hi,

For x86, crash avoids storing any '__crc_*' symbols. It should do the
same for ARM, right? Credit goes to Rabin Vincent for this patch,
unless you don't like it, in which case you can blame me.

Another thing. The ARM kernel potentially includes a symbol 'PRRR'
with a value of 0xff0a81a8, defined in arch/arm/mm/proc-v7-2level.S.
The problem with this is that it's the symbol which ends up
st->symtable[st->symcnt-1] instead of '_end' which means a lot of
values will pass this check in in_ksymbol_range():

        if ((value >= st->symtable[0].value) &&
	    (value <= st->symtable[st->symcnt-1].value)) {
		if ((st->flags & PERCPU_SYMS) && (value < st->first_ksymbol))
			return FALSE;
		else
			return TRUE;
	}

How would you prefer dealing with this? How about excluding any
symbols with values > '_end'? A KSYMS_END flag could be added to the
machdep->flags. Or just unsetting KSYM_START when '_end' is
encountered in verify_symbol().

Regards,
Per
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