函数逻辑报告

Linux Kernel

v5.5.9

Brick Technologies Co., Ltd

Source Code:security\keys\request_key.c Create Date:2022-07-27 19:57:56
Last Modify:2020-03-12 14:18:49 Copyright©Brick
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函数名称：Get the appropriate destination keyring for the request.* The keyring selected is returned with an extra reference upon it which the* caller must release.

函数原型：static int construct_get_dest_keyring(struct key **_dest_keyring)

返回类型：int

参数：

类型参数名称
struct key **_dest_keyring
265  cred等于current_cred - Access the current task's subjective credentials* Access the subjective credentials of the current task. RCU-safe,* since nobody else can modify it.()
266  dest_keyring等于_dest_keyring
269  kenter("%p", dest_keyring)
272  如果dest_keyring则
274  key_get(dest_keyring)
275  否则
276  bool do_perm_check = true
281  当: default keyring to attach requested * keys to 恒等于KEY_REQKEY_DEFL_DEFAULT
282  当: default keyring to attach requested * keys to 恒等于KEY_REQKEY_DEFL_REQUESTOR_KEYRING
283  如果 assumed request_key authority 则
299  当: default keyring to attach requested * keys to 恒等于KEY_REQKEY_DEFL_THREAD_KEYRING
300  dest_keyring等于key_get( keyring private to this thread )
301  如果dest_keyring则退出
305  当: default keyring to attach requested * keys to 恒等于KEY_REQKEY_DEFL_PROCESS_KEYRING
306  dest_keyring等于key_get( keyring private to this process )
307  如果dest_keyring则退出
311  当: default keyring to attach requested * keys to 恒等于KEY_REQKEY_DEFL_SESSION_KEYRING
312  dest_keyring等于key_get( keyring inherited over fork )
314  如果dest_keyring则退出
318  当: default keyring to attach requested * keys to 恒等于KEY_REQKEY_DEFL_USER_SESSION_KEYRING
319  ret等于Look up the user and user session keyrings for the current process's UID,* creating them if they don't exist.
320  如果ret小于0则返回:ret
322  退出
324  当: default keyring to attach requested * keys to 恒等于KEY_REQKEY_DEFL_USER_KEYRING
325  ret等于Look up the user and user session keyrings for the current process's UID,* creating them if they don't exist.
326  如果ret小于0则返回:ret
328  退出
330  当: default keyring to attach requested * keys to 恒等于KEY_REQKEY_DEFL_GROUP_KEYRING
331  默认
332  BUG()
344  如果dest_keyring且do_perm_check则
345  ret等于Check to see whether permission is granted to use a key in the desired way.
347  如果ret则
354  _dest_keyring等于dest_keyring
355  kleave(" [dk %d]", key_serial(dest_keyring))
356  返回:0
调用者
名称描述
construct_key_and_linkCommence key construction.