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keyctl_update(3) — Linux manual page

KEYCTL_UPDATE(3)        Linux Key Management CallsKEYCTL_UPDATE(3)

NAME        top

       keyctl_update - update a key

SYNOPSIS        top

#include <keyutils.h>long keyctl_update(key_serial_tkey, const void *payload,size_tplen);

DESCRIPTION        top

keyctl_update() updates the payload of a key if the key type       permits it.       The caller must havewritepermission on a key to be able to       update it.payload andplen specify the data for the new payload.payload       may be NULL andplen may be zero if the key type permits that.       The key type may reject the data if it's in the wrong format or in       some other way invalid.

RETURN VALUE        top

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

ERRORS        top

ENOKEYThe key specified is invalid.EKEYEXPIRED              The key specified has expired.EKEYREVOKED              The key specified had been revoked.EINVALThe payload data was invalid.ENOMEMInsufficient memory to store the new payload.EDQUOTThe key quota for this user would be exceeded by increasing              the size of the key to accommodate the new payload.EACCESThe key exists, but is notwritableby the calling process.EOPNOTSUPP              The key type does not support the update operation on its              keys.

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),add_key(2),keyctl(2),request_key(2),keyctl(3),keyrings(7),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                           4 May 2006KEYCTL_UPDATE(3)

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

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