keyctl_setperm(3) — Linux manual page


KEYCTL_SETPERM(3)      Linux Key Management Calls      KEYCTL_SETPERM(3)

NAME         top

       keyctl_setperm - change the permissions mask on a key

SYNOPSIS         top

       #include <keyutils.h>

       long keyctl_setperm(key_serial_t key, key_perm_t perm);

DESCRIPTION         top

       keyctl_setperm() changes the permissions mask on a key.

       A process that does not have the SysAdmin capability may not
       change the permissions mask on a key that doesn't have the same
       UID as the caller.

       The caller must have setattr permission on a key to be able to
       change its permissions mask.

       The permissions mask is a bitwise-OR of the following flags:

              Grant permission to view the attributes of a key.

              Grant permission to read the payload of a key or to list a

              Grant permission to modify the payload of a key or to add
              or remove links to/from a keyring.

              Grant permission to find a key or to search a keyring.

              Grant permission to make links to a key.

              Grant permission to change the ownership and permissions
              attributes of a key.

              Grant all the above.

       The 'xxx' in the above should be replaced by one of:

       POS    Grant the permission to a process that possesses the key
              (has it attached searchably to one of the process's

       USR    Grant the permission to a process with the same UID as the

       GRP    Grant the permission to a process with the same GID as the
              key, or with a match for the key's GID amongst that
              process's Groups list.

       OTH    Grant the permission to any other process.

       Examples include: KEY_POS_VIEW, KEY_USR_READ, KEY_GRP_SEARCH and

       User, group and other grants are exclusive: if a process
       qualifies in the 'user' category, it will not qualify in the
       'groups' category; and if a process qualifies in either 'user' or
       'groups' then it will not qualify in the 'other' category.

       Possessor grants are cumulative with the grants from the 'user',
       'groups' and 'other' categories.

RETURN VALUE         top

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

ERRORS         top

       ENOKEY The specified key does not exist.

              The specified key has expired.

              The specified key has been revoked.

       EACCES The named key exists, but does not grant setattr
              permission to the calling process.

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 2023-12-22.  (At that time, the date of the most recent commit
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Linux                          4 May 2006              KEYCTL_SETPERM(3)

Pages that refer to this page: keyctl(2)keyctl(3)keyrings(7)