As soon as you run rexec using the -p param, the program crashes.

# ./rexec -p test -l test localhost ls
./rexec: can't allocate memory!

If I look in the source rexec.c on line 318 there is the following statement

        *passwd = malloc((char *)malloc((passlen+1)*sizeof(char)));

I dont know much about C, so I may have this completely wrong.
but here it allocates memory malloc((passlen+1)*sizeof(char)) and then take the pointer to that memory and use that pointer as a size to allocate more memory :)?
That line probably should be:

        *passwd = malloc((passlen+1)*sizeof(char)));

If I recompile after this change all looks OK, and rexec works great.
this problem seems to exist in fedora 13 and fedora 14