Name

process-keyring — per-process shared keyring

DESCRIPTION

The process keyring is a keyring used to anchor keys on behalf of a process. It is created only when a process requests it. The process keyring has the name (description) _pid.

A special serial number value, KEY_SPEC_PROCESS_KEYRING, is defined that can be used in lieu of the actual serial number of the calling process's process keyring.

From the keyctl(1) utility, '@p' can be used instead of a numeric key ID in much the same way, but since keyctl(1) is a program run after forking, this is of no utility.

A thread created using the clone(2) CLONE_THREAD flag has the same process keyring as the caller of clone(2). When a new process is created using fork() it initially has no process keyring. A process's process keyring is cleared on execve(2). The process keyring is destroyed when the last thread that refers to it terminates.

If a process doesn't have a process keyring when it is accessed, then the process keyring will be created if the keyring is to be modified; otherwise, the error ENOKEY results.

SEE ALSO

keyctl(1), keyctl(3), keyrings(7), persistent-keyring(7), session-keyring(7), thread-keyring(7), user-keyring(7), user-session-keyring(7)

COLOPHON

This page is part of release 4.12 of the Linux man-pages project. A description of the project, information about reporting bugs, and the latest version of this page, can be found at https://www.kernel.org/doc/man−pages/.


Copyright (C) 2014 Red Hat, Inc. All Rights Reserved.
Written by David Howells (dhowellsredhat.com)

%%%LICENSE_START(GPLv2+_SW_ONEPARA)
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version
2 of the License, or (at your option) any later version.
%%%LICENSE_END