изменить маску разрешений на ключе (change the permissions mask on a key)
Имя (Name)
keyctl_setperm - change the permissions mask on a key
Синопсис (Synopsis)
#include <keyutils.h>
long keyctl_setperm(key_serial_t key, key_perm_t perm);
Описание (Description)
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:
KEY_xxx_VIEW
Grant permission to view the attributes of a key.
KEY_xxx_READ
Grant permission to read the payload of a key or to list a
keyring.
KEY_xxx_WRITE
Grant permission to modify the payload of a key or to add
or remove links to/from a keyring.
KEY_xxx_SEARCH
Grant permission to find a key or to search a keyring.
KEY_xxx_LINK
Grant permission to make links to a key.
KEY_xxx_SETATTR
Grant permission to change the ownership and permissions
attributes of a key.
KEY_xxx_ALL
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
keyrings).
USR Grant the permission to a process with the same UID as the
key.
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
KEY_OTH_ALL.
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.
Возвращаемое значение (Return value)
On success keyctl_setperm() returns 0 . On error, the value -1
will be returned and errno will have been set to an appropriate
error.
Ошибки (Error)
ENOKEY The specified key does not exist.
EKEYEXPIRED
The specified key has expired.
EKEYREVOKED
The specified key has been revoked.
EACCES The named key exists, but does not grant setattr
permission to the calling process.
Ссылки (Linking)
This is a library function that can be found in libkeyutils.
When linking, -lkeyutils should be specified to the linker.
Смотри также (See also)
keyctl(1), add_key(2), keyctl(2), request_key(2), keyctl(3),
keyrings(7), keyutils(7)
