This executable can read data from local files.
This function can be performed by any unprivileged user.
gzip -c /path/to/input-file | gzip -d
This function is performed by the privileged user if executed via sudo because the acquired privileges are not dropped.
gzip -c /path/to/input-file | gzip -d
This function is performed by the privileged user if the executable has the SUID bit set and the right ownership because the effective privileges are not dropped.
gzip -c /path/to/input-file | gzip -d
This function is performed bypassing the usual kernel permission checks if the executable has certain capabilities set.
The following capabilities are needed:
CAP_DAC_OVERRIDE.
gzip -c /path/to/input-file | gzip -d