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long keyctl_get_security(key_serial_t key, char *buffer,
long keyctl_get_security_alloc(key_serial_t key, char **_buffer);
keyctl_get_security() retrieves the security context of a key as a NUL-
terminated string. This will be rendered in a form appropriate to the
LSM in force - for instance, with SELinux, it may look like
The caller must have view permission on a key to be able to get its
buffer and buflen specify the buffer into which the string will be
placed. If the buffer is too small, the full size of the string will
be returned, and no copy will take place.
keyctl_get_security_alloc() is similar to keyctl_get_security() except
that it allocates a buffer big enough to hold the string and copies the
string into it. If successful, A pointer to the buffer is placed in
*_buffer. The caller must free the buffer.
On success keyctl_get_security() returns the amount of data placed into
the buffer. If the buffer was too small, then the size of buffer
required will be returned, but no data will be transferred. On error,
the value -1 will be returned and errno will have been set to an appro-
On success keyctl_get_security_alloc() returns the amount of data in
the buffer, less the NUL terminator. On error, the value -1 will be
returned and errno will have been set to an appropriate error.
ENOKEY The key specified is invalid.
The key specified has expired.
The key specified had been revoked.
EACCES The key exists, but is not viewable by the calling process.
This is a library function that can be found in libkeyutils. When
linking, -lkeyutils should be specified to the linker.