Function report

Linux Kernel

v5.5.9

Brick Technologies Co., Ltd

Source Code:security\keys\request_key.c Create Date:2022-07-28 18:23:27
Last Modify:2020-03-12 14:18:49 Copyright©Brick
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Annotation kernel can get tool activityDownload SCCTChinese

Name:Get the appropriate destination keyring for the request.* The keyring selected is returned with an extra reference upon it which the* caller must release.

Proto:static int construct_get_dest_keyring(struct key **_dest_keyring)

Type:int

Parameter:

TypeParameterName
struct key **_dest_keyring
265  cred = 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 = _dest_keyring
269  kenter("%p", dest_keyring)
272  If dest_keyring Then
274  key_get(dest_keyring)
275  Else
276  bool do_perm_check = true
281  Case default keyring to attach requested * keys to == KEY_REQKEY_DEFL_DEFAULT
282  Case default keyring to attach requested * keys to == KEY_REQKEY_DEFL_REQUESTOR_KEYRING
283  If assumed request_key authority Then
299  Case default keyring to attach requested * keys to == KEY_REQKEY_DEFL_THREAD_KEYRING
300  dest_keyring = key_get( keyring private to this thread )
301  If dest_keyring Then Break
305  Case default keyring to attach requested * keys to == KEY_REQKEY_DEFL_PROCESS_KEYRING
306  dest_keyring = key_get( keyring private to this process )
307  If dest_keyring Then Break
311  Case default keyring to attach requested * keys to == KEY_REQKEY_DEFL_SESSION_KEYRING
312  dest_keyring = key_get( keyring inherited over fork )
314  If dest_keyring Then Break
318  Case default keyring to attach requested * keys to == KEY_REQKEY_DEFL_USER_SESSION_KEYRING
319  ret = Look up the user and user session keyrings for the current process's UID,* creating them if they don't exist.
320  If ret < 0 Then Return ret
322  Break
324  Case default keyring to attach requested * keys to == KEY_REQKEY_DEFL_USER_KEYRING
325  ret = Look up the user and user session keyrings for the current process's UID,* creating them if they don't exist.
326  If ret < 0 Then Return ret
328  Break
330  Case default keyring to attach requested * keys to == KEY_REQKEY_DEFL_GROUP_KEYRING
331  Default
332  BUG()
344  If dest_keyring && do_perm_check Then
345  ret = Check to see whether permission is granted to use a key in the desired way.
347  If ret Then
354  _dest_keyring = dest_keyring
355  kleave(" [dk %d]", key_serial(dest_keyring))
356  Return 0
Caller
NameDescribe
construct_key_and_linkCommence key construction.