keyctl_get_security

函数名称：Get a key's the LSM security label.* The key must grant the caller View permission for this to work.* If there's a buffer, then up to buflen bytes of data will be placed into it.* If successful, the amount of information available will be returned,

函数原型：long keyctl_get_security(key_serial_t keyid, char __user *buffer, size_t buflen)

返回类型：long

参数：

类型	参数	名称
key_serial_t	keyid
char __user *	buffer
size_t	buflen

1495

key_ref等于Look up a key ID given us by userspace with a given permissions mask to get* the key it refers to.* Flags can be passed to request that special keyrings be created if referred* to directly, to permit partially constructed keys to be found and to skip

1496

如果是错误则

1497

如果错误不等于负EACCES则返回:错误

1502

instkey等于Search the current process's keyrings for the authorisation key for* instantiation of a key.

1503

如果是错误则返回:错误

1505

key_put - Discard a reference to a key.*@key: The key to discard a reference from.* Discard a reference to a key, and when all the references are gone, we* schedule the cleanup task to come and pull it out of the tree in process

1507

key_ref等于Look up a key ID given us by userspace with a given permissions mask to get* the key it refers to.* Flags can be passed to request that special keyrings be created if referred* to directly, to permit partially constructed keys to be found and to skip

1508

如果是错误则返回:错误

1512

key等于key_ref_to_ptr(key_ref)

1513

ret等于security_key_getsecurity(key, & context)

1514

如果ret恒等于0则

1517

ret等于1

1518

如果buffer且buflen大于0且copy_to_user(buffer, "", 1)不等于0则ret等于负EFAULT

1521

否则如果ret大于0则

1523

如果buffer且buflen大于0则

1524

如果buflen大于ret则buflen等于ret

1527

如果copy_to_user(buffer, context, buflen)不等于0则ret等于负EFAULT

1531

1534

key_ref_put(key_ref)

1535

返回:ret

**调用者**
名称	描述
SYSCALL_DEFINE5	The key control system call
COMPAT_SYSCALL_DEFINE5	The key control system call, 32-bit compatibility version for 64-bit archs

源代码转换工具开放的插件接口	X
支持：c/c++/esqlc/java Oracle/Informix/Mysql 插件可实现：逻辑报告代码生成和批量转换代码