KEYCTL_GET_SECURITY(2const) - Linux manual page (original) (raw)

KEYCTLGETSECURITY(2const) KEYCTLGETSECURITY(2const)

NAME top

   KEYCTL_GET_SECURITY - manipulate the kernel's key management
   facility

LIBRARY top

   Standard C library (_libc_, _-lc_)

SYNOPSIS top

   **#include <linux/keyctl.h>** /* Definition of **KEY*** constants */
   **#include <sys/syscall.h>** /* Definition of **SYS_*** constants */
   **#include <unistd.h>**

   **long syscall(SYS_keyctl, KEYCTL_GET_SECURITY, key_serial_t** _key_**,**
                **char** _buf_**[_Nullable .**_n_**], size_t** _n_**);**

DESCRIPTION top

   **KEYCTL_GET_SECURITY** (since Linux 2.6.26)
          Get the LSM (Linux Security Module) security label of the
          specified key.

   The ID of the key whose security label is to be fetched is
   specified in _key_.  The security label (terminated by a null byte)
   will be placed in the buffer pointed to by _buf_ argument; the size
   of the buffer must be provided in _n_.

   If _buf_ is specified as NULL or the buffer size specified in _n_ is
   too small, the full size of the security label string (including
   the terminating null byte) is returned as the function result, and
   nothing is copied to the buffer.

   The caller must have _view_ permission on the specified key.

   The returned security label string will be rendered in a form
   appropriate to the LSM in force.  For example, with SELinux, it
   may look like:

       unconfined_u:unconfined_r:unconfined_t:s0-s0:c0.c1023

   If no LSM is currently in force, then an empty string is placed in
   the buffer.

RETURN VALUE top

   On success, the size of the LSM security label string (including
   the terminating null byte), irrespective of the provided buffer
   size.

   On error, -1 is returned, and _[errno](../man3/errno.3.html)_ is set to indicate the error.

VERSIONS top

   A wrapper is provided in the _libkeyutils_ library:
   [keyctl_get_security(3)](../man3/keyctl%5Fget%5Fsecurity.3.html).

STANDARDS top

   Linux.

HISTORY top

   Linux 2.6.26.

SEE ALSO top

   [keyctl(2)](../man2/keyctl.2.html), [keyctl_get_security(3)](../man3/keyctl%5Fget%5Fsecurity.3.html), **keyctl_get_security_alloc**(3)

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Linux man-pages 6.10 2024-08-21 KEYCTLGETSECURITY(2const)

Pages that refer to this page:keyctl(2)