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keyctl_restrict_keyring(3) — Linux manual page

KEYCTL_R...T_KEYRING(3) Linux Key Management CallsKEYCTL_R...T_KEYRING(3)

NAME        top

       keyctl_restrict_keyring - restrict keys that may be linked to a       keyring

SYNOPSIS        top

#include <keyutils.h>long keyctl_restrict_keyring(key_serial_tkeyring,const char *type, const char *restriction);

DESCRIPTION        top

keyctl_restrict_keyring() limits the linkage of keys to the givenkeyring using a provided keytype andrestriction 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       bothNULL,the keyring will reject all links.

RETURN VALUE        top

       On successkeyctl_restrict_keyring() returns0.  On error, the       value-1will be returned anderrno will have been set to an       appropriate error.

ERRORS        top

EDEADLK              A restriction cycle was avoided. Two keyrings cannot              restrict each other.EEXISTThe keyring is already restricted.EINVALThe restriction string is invalid or too large.ENOKEYThe key type in the restriction is invalid or not              available.ENOTDIR              The provided key id references an item that is not a              keyring.ENOENTThe key type exists but does not support restrictions.

LINKING        top

       This is a library function that can be found inlibkeyutils.  When       linking,-lkeyutilsshould be specified to the linker.

SEE ALSO        top

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

COLOPHON        top

       This page is part of thekeyutils (key management utilities)       project.  Information about the project can be found at [unknown       -- if you know, please contact man-pages@man7.org] If you have a       bug report for this manual page, send it to       keyrings@linux-nfs.org.  This page was obtained from the project's       upstream Git repository       ⟨http://git.kernel.org/pub/scm/linux/kernel/git/dhowells/keyutils.git⟩       on 2025-08-11.  (At that time, the date of the most recent commit       that was found in the repository was 2023-03-20.)  If you discover       any rendering problems in this HTML version of the page, or you       believe there is a better or more up-to-date source for the page,       or you have corrections or improvements to the information in this       COLOPHON (which isnot part of the original manual page), send a       mail to man-pages@man7.orgLinux                          28 Feb 2017KEYCTL_R...T_KEYRING(3)

Pages that refer to this page:KEYCTL_RESTRICT_KEYRING(2const), keyctl(3)

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