From gkd-capability.c:

This program needs the CAP_IPC_LOCK posix capability.
We want to allow either setuid root or file system based capabilies
to work. If file system based capabilities, this is a no-op unless
the root user is running the program. In that case we just drop
capabilities down to IPC_LOCK. If we are setuid root, then change to the
invoking user retaining just the IPC_LOCK capability. The application
is aborted if for any reason we are unable to drop privileges.

Motivation for this change

Seen the warning

insufficient process capabilities, insecure memory might get used

for the last time when debugging 😄

Things done

• Tested using sandboxing (nix.useSandbox on NixOS, or option sandbox in nix.conf on non-NixOS)
• Built on platform(s)
  • NixOS
  • macOS
  • other Linux distributions
• Tested via one or more NixOS test(s) if existing and applicable for the change (look inside nixos/tests)
• Tested compilation of all pkgs that depend on this change using nix-shell -p nix-review --run "nix-review wip"
• Tested execution of all binary files (usually in ./result/bin/)
• Determined the impact on package closure size (by running nix path-info -S before and after)
• Assured whether relevant documentation is up to date
• Fits CONTRIBUTING.md.