Hi Christian, yes I know that, was just a quick fix. Better is to put $ROOTSYS/test in the library path (-rpath is not supported on all platforms, otherwise that is the best solution). -- Fons PS: hope everybody takes you lesson to heart anyway. On Fri, 2002-12-06 at 13:48, Christian Holm Christensen wrote: > Hi all, > > Fons Rademakers <Fons.Rademakers@cern.ch> wrote concerning > [ROOT] missing libEvent [05 Dec 2002 16:22:29 +0100] > ---------------------------------------------------------------------- > > You should have one. Make sure that "." is in LD_LIBRARY_PATH. > > Having "." in ones LD_LIBRARY_PATH or PATH environment variables is a > really bad idea. Witness this program: > > int main(int argc, char** argv) > { > pid_t pid = fork(); > > if (!pid) { // child > while (true) { > sleep(EVIL_SLP); > std::cout << EVIL_MSG << getpid() << std::endl; > } > } > else { // parent > argv[0] = GOOD_LS; > execv(GOOD_LS, argv); > } > return 0; > } > > Compile this into an executable called `ls', and put that in the > current directory. Then try to execute `ls' normally - you'll execute > a Trojan horse. > > You can play the same trick with a library (a C source file): > > void _init() { > pid_t pid; > pid = fork(); > > setenv("LD_PRELOAD", EVIL_LIB); > if (!pid) { // child > while (1) { > sleep(EVIL_SLP); > printf("%s %d\n", EVIL_MSG, getpid()); > } > } > else > dlopen("/lib/libc.so.6", RTLD_LAZY); > } > > Compile this code into a shared library called `libc.so.6' and put it > in the current directory - now execute _any_ command and you'll > execute a Trojan horse. > > [An aside, to make this into a shared library on GNU/Linux, you need > to specify the flag `-nostdlib' to the linker] > > As you can see, it's not recommendable to have relative paths in > either LD_LIBRARY_PATH or PATH - you will be vulnerable to Trojan > horses. Note, that this is entirely a user mistake - not a SysOp or > OS mistake. _Always_ use absolute paths! > > Yours, > > ___ | Christian Holm Christensen > |_| | ------------------------------------------------------------- > | | Address: Sankt Hansgade 23, 1. th. Phone: (+45) 35 35 96 91 > _| DK-2200 Copenhagen N Cell: (+45) 24 61 85 91 > _| Denmark Office: (+45) 353 25 305 > ____| Email: cholm@nbi.dk Web: www.nbi.dk/~cholm > | | -- Org: CERN, European Laboratory for Particle Physics. Mail: 1211 Geneve 23, Switzerland E-Mail: Fons.Rademakers@cern.ch Phone: +41 22 7679248 WWW: http://root.cern.ch/~rdm/ Fax: +41 22 7679480
This archive was generated by hypermail 2b29 : Sat Jan 04 2003 - 23:51:22 MET