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

NAME
       user-keyring - per-user keyring

DESCRIPTION
       The  user keyring is a keyring used to anchor keys on behalf of a user.  Each UID the ker-
       nel deals with has its own user keyring that is shared by all  processes  with  that  UID.
       The  user  keyring has a name (description) of the form _uid.<UID> where <UID> is the user
       ID of the corresponding user.

       The user keyring is associated with the record that the kernel maintains for the UID.   It
       comes  into  existence  upon  the  first  attempt  to  access either the user keyring, the
       user-session-keyring(7), or the session-keyring(7).  The keyring remains pinned  in  exis-
       tence  so  long as there are processes running with that real UID or files opened by those
       processes remain open.  (The keyring can also be pinned indefinitely by  linking  it  into
       another keyring.)

       Typically, the user keyring is created by pam_keyinit(8) when a user logs in.

       The  user  keyring is not searched by default by request_key(2).  When pam_keyinit(8) cre-
       ates a session keyring, it adds to it a link to the user keyring so that the user  keyring
       will be searched when the session keyring is.

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

       From the keyctl(1) utility, '@u' can be used instead of a numeric key ID in much the  same
       way.

       User  keyrings are independent of clone(2), fork(2), vfork(2), execve(2), and _exit(2) ex-
       cepting that the keyring is destroyed when the UID  record  is  destroyed  when  the  last
       process pinning it exits.

       If  it  is necessary for a key associated with a user to exist beyond the UID record being
       garbage  collected--for  example,  for  use  by  a  cron(8)   script--then   the   persis-
       tent-keyring(7) should be used instead.

       If a user keyring does not exist when it is accessed, it will be created.

SEE ALSO
       keyctl(1), keyctl(3), keyrings(7), persistent-keyring(7), process-keyring(7),
       session-keyring(7), thread-keyring(7), user-session-keyring(7), pam_keyinit(8)

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                            USER-KEYRING(7)

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