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PROCESS-KEYRING(7) Linux Programmer's Manual PROCESS-KEYRING(7)
process-keyring - per-process shared keyring
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.
keyctl(1), keyctl(3), keyrings(7), persistent-keyring(7),
session-keyring(7), thread-keyring(7), user-keyring(7),
user-session-keyring(7)
This page is part of release 5.10 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/.
Linux 2020-08-13 PROCESS-KEYRING(7)
Pages that refer to this page: add_key(2), keyctl(2), request_key(2), keyrings(7), keyutils(7), persistent-keyring(7), session-keyring(7), thread-keyring(7), user-keyring(7), user-session-keyring(7)
Copyright and license for this manual page
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