Fenris debugger on Ubuntu?

[VoidOfNothingness]

Hello,

I have been trying to compile Fenris (http://lcamtuf.coredump.cx/fenris/) on Ubuntu for quite some time... But to avail. Is there someone who had succeeded in this task?

When I do try to compile Fenris, I do fail in a GDB related check:


[+] Library mapping address: problems executing gdb!
[-] I need gdb to determine your defaults. Please consult documentation.


The code in the building script that causes such error is the following:



echo -n "[+] Library mapping address: "

echo "break main" >.testerr 2>/dev/null
echo "x/2w getuid" >>.testerr 2>/dev/null
echo "x/10w __do_global_ctors_aux" >>.testerr 2>/dev/null
echo "x/10w __do_global_ctors_aux+1" >>.testerr 2>/dev/null
echo "x/10w __do_global_ctors_aux+2" >>.testerr 2>/dev/null
echo "x/10w __do_global_ctors_aux+3" >>.testerr 2>/dev/null
echo "x/10w __do_global_ctors_aux+4" >>.testerr 2>/dev/null
echo "x/10w __do_global_ctors_aux+5" >>.testerr 2>/dev/null
echo "x/10w __do_global_ctors_aux+6" >>.testerr 2>/dev/null
echo "x/10w __do_global_ctors_aux+7" >>.testerr 2>/dev/null

echo "run" >>.testerr 2>/dev/null
echo "x open" >>.testerr 2>/dev/null
echo "x/2w _dl_runtime_resolve+16" >>.testerr 2>/dev/null

gdb -batch -x .testerr ./.testme >.gtmp 2>/dev/null

ADDR=`grep open .gtmp 2>/dev/null|grep ^0x 2>/dev/null | awk '{print $1}' 2>/de$

RES=`grep -F resolve .gtmp 2>/dev/null`
JMP=`grep -F getuid .gtmp 2>/dev/null`

rm -f .testerr .testme

if [ "$ADDR" = "" ]; then
rm -f .gtmp
echo "problems executing gdb!"
echo "[-] I need gdb to determine your defaults. Please consult documentation$
echo
exit 1
fi


From what I can understand from the above code, the script is building some test "binary" to be debugged using GDB, and then evaluates the debugging session's results...
Can someone shed some light over this?

[babil]

[=] Patch "build"

it's basically one line, move echo "run" >>.testerr 2>/dev/null after echo "break main" >.testerr 2>/dev/null



--- build 2008-05-28 18:27:06.000000000 +1000
+++ build.patched 2008-05-28 18:24:00.000000000 +1000
@@ -384,6 +384,7 @@
echo -n "[+] Library mapping address: "

echo "break main" >.testerr 2>/dev/null
+echo "run" >>.testerr 2>/dev/null
echo "x/2w getuid" >>.testerr 2>/dev/null
echo "x/10w __do_global_ctors_aux" >>.testerr 2>/dev/null
echo "x/10w __do_global_ctors_aux+1" >>.testerr 2>/dev/null
@@ -395,7 +396,6 @@
echo "x/10w __do_global_ctors_aux+7" >>.testerr 2>/dev/null
echo "x/10w __do_global_ctors_aux+8" >>.testerr 2>/dev/null

-echo "run" >>.testerr 2>/dev/null
echo "x open" >>.testerr 2>/dev/null
echo "x/2w _dl_runtime_resolve+16" >>.testerr 2>/dev/null