Re: Creating new System.map with modules symbol info

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Adayadil Thomas wrote:
[...]
If i Use the original System.map, it doesnt find the symbol for the
init_conntrack_syn
( EIP is pointing there)
However, kallsyms has an entry for that
f8b752c8 t init_conntrack_syn

If kallsyms has all the symbols, I am wondering why does it have lesser lines ?

wc -l
12343 kallsyms
32127 System.map

By default kallsyms only stores symbols that are int the kernel's text areas, whereas System.map has all the symbols.

You can make kallsyms store all the symbols by setting CONFIG_KALLSYMS_ALL in your kernel configuration, but the extra symbol data will increase your kernel size. Depending on the target host memory size this can be either negligeable or a big problem :)

However, module symbols appear in the /proc/kallsyms file using a totally different mechanism, and even if you don't set CONFIG_KALLSYMS_ALL, module data symbols (and others) still show up there.

By the way, if you had KALLSYMS configured in the first place, the kernel itself would translate those addresses for you for free.

Will it work if I cat System.map and kallsyms together and do a sort and uniq
so that i get the union of both ?

Unless you really need non-text symbols, kallsyms should have all the information you need. If you need _everything_ then you can just do something like (totally untested) "grep \\[ /proc/kallsyms >> System.map" to add the symbols from modules to the System.map.

I don't know if the tools out there will like this, though...

--
Paulo Marques - www.grupopie.com

The rule is perfect: in all matters of opinion our
adversaries are insane.
Mark Twain
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