When a file with the setuid flag enabled is COPYed from one stage to another, the setuid flag is lost. This appears to be new behavior as of v1.8.0. In this example, I use fixuid as the file under ...

I am quite interested in making basic Linux userspace work without setuid binaries, so that we can set NoNewPrivs in PID 1 early on and remove an entire class of security issues. This works relatively ...

Apptainer (formerly known as Singularity) since its beginning implemented many of its container features with the assistance of a setuidroot program. It still supports that mode, but as of version 1.1 ...

With some help from readers, we have the answer (sort of) to why the Open Firmware Password Utility would not copy from the Mac OS X Install CD to our hard drive - although it would copy if booted ...

Intended audience: System administrators, system programmers, and users, especially those interested in the underpinnings of UNIX system security; those needing to write programs which change ...