ERROR: ld.so: object '/opt/SUNWut/lib/libusbut.so.1' from LD_PRELOAD cannot

Question

When I try to run a libusb app via utusbrun or by just setting the LD_PRELOAD I got this message.
ERROR: ld.so: object '/opt/SUNWut/lib/libusbut.so.1' from LD_PRELOAD cannot be preloaded: ignored.
Some one that got any idea?
Running SRSS 4.0 on Scientific linux 4.7
Edited by: deg on Jan 10, 2008 1:17 AM

Answer 1

Is the application a setuid or setgid executable? The LD_PRELOAD environment variable is ignored by setuid and setgid executables unless the preload library lives in one of the default library directories and has its setuid bit set. (See 'man ld.so' for details.) If you can live with the security risks then you could try copying the libusbut.so.1 file into /usr/lib and turning on its setuid bit. You'll also need to copy libut.so.1 and libutdev.so.1 into /usr/lib but you shouldn't need to turn on their setuid bits.
I don't know of any security issues with libusbut.so.1 being used in this way, but it's not safe to just assume that it will be secure. If your app is setuid or setgid and this approach solves the problem then it would be worth checking with Sun to find out whether they believe that it's safe to have libusbut executed like this by a setuid or setgid program. The answer might depend on how the program manages its privileges so it would be helpful if you tell Sun what libusb program(s) you're using.
A better way to proceed would be to try to get rid of the setuid or setgid bit on the application.