mirror of https://github.com/mkerrisk/man-pages
62 lines
1.8 KiB
Groff
62 lines
1.8 KiB
Groff
.\"
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.\" Copyright (C) 2014 Red Hat, Inc. All Rights Reserved.
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.\" Written by David Howells (dhowells@redhat.com)
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.\"
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.\" %%%LICENSE_START(GPLv2+_SW_ONEPARA)
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.\" This program is free software; you can redistribute it and/or
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.\" modify it under the terms of the GNU General Public License
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.\" as published by the Free Software Foundation; either version
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.\" 2 of the License, or (at your option) any later version.
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.\" %%%LICENSE_END
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.\"
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.TH PROCESS-KEYRING 7 2017-03-13 Linux "Linux Programmer's Manual"
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.SH NAME
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process-keyring \- per-process shared keyring
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.SH DESCRIPTION
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The process keyring is a keyring used to anchor keys on behalf of a process.
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It is created only when a process requests it.
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The process keyring has the name (description)
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.IR _pid .
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.PP
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A special serial number value,
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.BR KEY_SPEC_PROCESS_KEYRING ,
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is defined that can be used in lieu of the actual serial number of
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the calling process's process keyring.
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.PP
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From the
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.BR keyctl (1)
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utility, '\fB@p\fP' can be used instead of a numeric key ID in
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much the same way, but since
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.BR keyctl (1)
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is a program run after forking, this is of no utility.
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.PP
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A thread created using the
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.BR clone (2)
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.B CLONE_THREAD
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flag has the same process keyring as the caller of
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.BR clone (2).
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When a new process is created using
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.BR fork ()
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it initially has no process keyring.
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A process's process keyring is cleared on
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.BR execve (2).
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The process keyring is destroyed when the last
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thread that refers to it terminates.
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.PP
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If a process doesn't have a process keyring when it is accessed,
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then the process keyring will be created if the keyring is to be modified;
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otherwise, the error
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.B ENOKEY
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results.
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.SH SEE ALSO
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.ad l
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.nh
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.BR keyctl (1),
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.BR keyctl (3),
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.BR keyrings (7),
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.BR persistent\-keyring (7),
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.BR session\-keyring (7),
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.BR thread\-keyring (7),
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.BR user\-keyring (7),
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.BR user\-session\-keyring (7)
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