keyctl_restrict_keyring(3) — Linux manual page


KEYCTL_..._KEYRING(3)  Linux Key Management Calls  KEYCTL_..._KEYRING(3)

NAME         top

       keyctl_restrict_keyring - restrict keys that may be linked to a

SYNOPSIS         top

       #include <keyutils.h>

       long keyctl_restrict_keyring(key_serial_t keyring,
       const char *type, const char *restriction);

DESCRIPTION         top

       keyctl_restrict_keyring() limits the linkage of keys to the given
       keyring using a provided key type and restriction scheme. The
       available options vary depending on the key type, and typically
       contain a restriction name possibly followed by key ids or other
       data relevant to the restriction. If the type and restriction are
       both NULL, the keyring will reject all links.

RETURN VALUE         top

       On success keyctl_restrict_keyring() returns 0.  On error, the
       value -1 will be returned and errno will have been set to an
       appropriate error.

ERRORS         top

              A restriction cycle was avoided. Two keyrings cannot
              restrict each other.

       EEXIST The keyring is already restricted.

       EINVAL The restriction string is invalid or too large.

       ENOKEY The key type in the restriction is invalid or not

              The provided key id references an item that is not a

       ENOENT The key type exists but does not support restrictions.

LINKING         top

       This is a library function that can be found in libkeyutils.
       When linking, -lkeyutils should be specified to the linker.

SEE ALSO         top

       keyctl(1), keyctl(2), keyctl(3), keyutils(7)

COLOPHON         top

       This page is part of the keyutils (key management utilities)
       project.  Information about the project can be found at [unknown
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       bug report for this manual page, send it to  This page was obtained from the
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       on 2023-12-22.  (At that time, the date of the most recent commit
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Linux                          28 Feb 2017         KEYCTL_..._KEYRING(3)

Pages that refer to this page: keyctl(3)