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user-session-keyring.7: Add some details on lifetime of user session keyring 

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
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Michael Kerrisk 2016-11-02 23:15:22 +01:00
parent 2929ba6883
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1 changed files with 15 additions and 5 deletions
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man7/user-session-keyring.7
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@ -14,11 +14,21 @@
user-session-keyring \- per-user default session keyring
.SH DESCRIPTION
The user session keyring is a keyring used to anchor keys on behalf of a user.
Each UID the kernel deals with has its own user session keyring.
This keyring is associated with
the record that the kernel maintains for the UID and, once created,
is retained as long as that record persists.
It is shared amongst all processes of that UID.
Each UID the kernel deals with has its own user session keyring that
is shared by all processes with that UID.
The user session keyring is associated with the record that
the kernel maintains for the UID.
It comes into existence upon the first attempt to access either the
user session keyring, the
.BR user-keyring (7),
or the
.BR session-keyring (7).
.\" Davis Howells: the user and user-session keyrings are managed as a pair.
The keyring remains pinned in existence so long as there are processes
running with that real UID or files opened by those processes remain open.
(The keyring can also be pinned indefinitely by linking it
into another keyring.)
The user session keyring is created on demand when a thread requests it
or when a thread asks for its