DEEPAK BHATIA wrote:
Can anyone please suggest how to proceed ? How do I tell the OS to invoke my
dynamic linker instead of the original one.
You can explicitly invoke a different runtime linker:
oxpoly 428. cp /usr/lib/ld.so.1 /tmp/ld.so.1
oxpoly 429. /tmp/ld.so.1 /bin/cat &
[1] 17398
oxpoly 430. pmap 17398
17398: /tmp/ld.so.1 /bin/cat
00010000 16K r-x-- /usr/bin/cat
00024000 8K rwx-- /usr/bin/cat
........
FF3B0000 208K r-x-- /tmp/ld.so.1
FF3F4000 8K rwx-- /tmp/ld.so.1
You can also embed the name of a non-default runtime linker
within an application:
oxpoly 435. LD_OPTIONS=-I/tmp/ld.so.1 cc -o main main.c
oxpoly 436. elfdump -i main
Interpreter Section: .interp
/tmp/ld.so.1
I use mdb(1) to debug ld.so.1, plus there are some helper functions
available from our mdb module. See
http://docs.sun.com/app/docs/doc/817-1984/6mhm7pl1k?a=view
And, don't forget printf's :-) They are easy to add, and it takes
just seconds to rebuild ld.so.1.
--
Rod
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