thread-keyring(7) — Linux manual page

NAME | DESCRIPTION | SEE ALSO | COLOPHON

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

NAME         top

       thread-keyring - per-thread keyring

DESCRIPTION         top

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

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

       From the keyctl(1) utility, '@t' can be used instead of a numeric
       key ID in much the same way, but as keyctl(1) is a program run
       after forking, this is of no utility.

       Thread keyrings are not inherited across clone(2) and fork(2) and
       are cleared by execve(2).  A thread keyring is destroyed when the
       thread that refers to it terminates.

       Initially, a thread does not have a thread keyring.  If a thread
       doesn't have a thread keyring when it is accessed, then it will
       be created if it is to be modified; otherwise the operation fails
       with the error ENOKEY.

SEE ALSO         top

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

COLOPHON         top

       This page is part of release 5.11 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              THREAD-KEYRING(7)

Pages that refer to this page: add_key(2)keyctl(2)request_key(2)keyrings(7)keyutils(7)persistent-keyring(7)process-keyring(7)session-keyring(7)user-keyring(7)user-session-keyring(7)