PROCESS-KEYRING(7) - man - phpMan

PROCESS-KEYRING(7)                    Linux Programmer's Manual                   PROCESS-KEYRING(7)



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  de‐
       stroyed 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 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)