In addition, the link-loader already should ignore LD_PRELOAD for setuid binaries so even if you're not root but running a setuid binary, LD_PRELOAD can't help

In addition, the link-loader already should ignore LD_PRELOAD for setuid binaries so even if you're not root but running a setuid binary, LD_PRELOAD can't help you (and if it can it's a security flaw with the link-loader).