I want to know what program calls a particular executable, including when that executable is used as an interpreter via a shebang line.
This is not quite the same problem as knowing what program accesses a particular file. For example,
auditctl -w /usr/bin/myprogram tells me that the program is being executed by… itself, since the audit event is generated after the successful
One option is to replace the executable by a wrapper program, like this…
#!/bin/sh logger "$0: executed by uid=$(id -u) ruid=$(id -ur) cmd=$(ps -o args= -p $PPID)" exec "$0.real" "$@"
But this requires moving the actual file, which is disruptive (the file can't be read-only, it clashes with modifications made by a package manager, etc.). And it doesn't work if the program is used as an interpreter for a script, because shebang doesn't nest. (In that case,
auditctl -w /usr/bin/interpreter does give a useful result, but I want a solution that works for both cases.) It also doesn't work for setuid programs if
/bin/sh is bash since bash drops privileges.
How can I monitor executions of a particular executable including uses of the executable as a shebang interpreter, and in particular log useful information about the calling process (not just the PPID but at least the process name or the parent executable path, ideally also the invoking user and arguments)? Preferably without replacing the file with a wrapper. A Linux-specific solution is fine.