keyctl_update(3) — Linux manual page


KEYCTL_UPDATE(3)       Linux Key Management Calls       KEYCTL_UPDATE(3)

NAME         top

       keyctl_update - update a key

SYNOPSIS         top

       #include <keyutils.h>

       long keyctl_update(key_serial_t key, const void *payload,
       size_t plen);

DESCRIPTION         top

       keyctl_update() updates the payload of a key if the key type
       permits it.

       The caller must have write permission on a key to be able to
       update it.

       payload and plen specify the data for the new payload.  payload
       may be NULL and plen 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 success keyctl_update() returns 0.  On error, the value -1
       will be returned and errno will have been set to an appropriate

ERRORS         top

       ENOKEY The key specified is invalid.

              The key specified has expired.

              The key specified had been revoked.

       EINVAL The payload data was invalid.

       ENOMEM Insufficient memory to store the new payload.

       EDQUOT The key quota for this user would be exceeded by
              increasing the size of the key to accommodate the new

       EACCES The key exists, but is not writable by the calling

              The key type does not support the update operation on its

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), add_key(2), keyctl(2), request_key(2), keyctl(3),
       keyrings(7), 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
       project's upstream Git repository
       on 2024-06-14.  (At that time, the date of the most recent commit
       that was found in the repository was 2023-03-20.)  If you
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       manual page), send a mail to

Linux                          4 May 2006               KEYCTL_UPDATE(3)

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