Re: Extracting symbol info out of processes at runtime

From: P. de Boer (pieter_at_thelostparadise.com)
Date: 04/29/04

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    To: Dag-Erling Smørgrav <des@des.no>
Date: Thu, 29 Apr 2004 14:51:47 +0200

    On Thu, 2004-04-29 at 14:30, Dag-Erling Smørgrav wrote:
    > "P. de Boer" <pieter@thelostparadise.com> writes:
    > > For a little private project I'm working at, I need to find the address
    > > of a function which is inside a shared library of a running process, OR
    > > the base address the library is running at
    >
    > man dlinfo

    Well, yes, dlinfo() would be very useful, if it was not for my wish to
    read the link_map from another proces, using ptrace(). I've looked at
    rtld-elf.c, to see what dlinfo() does: it finds the object by the given
    address and then 'returns' the link_map for that object. However, I
    can't find out where this info would be in the memory image of a running
    process.

    Apparantly the objects the loader keeps info on, are in a linked list,
    'obj_list', which is a global var of rtld-elf.c. Would this mean the
    info I'm trying to find is on the stack of the dynamic linker and
    therefor can't be found as long as I don't know where the linker is
    loaded into memory? Sounds like a chicken-and-egg problem in that case.

    If so, that would make things suckier than they already are, since I'm
    actually working on a Linux binary/libs, running on FreeBSD at the
    moment.. I hope(d) there was/is a generic method for all ELF binaries
    available, but if not, I'd better bug the Linux people a bit. 

    -- 
Pieter de Boer
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