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user namespace: add the framework

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Basically, it will allow a process to unshare its user_struct table,
resetting at the same time its own user_struct and all the associated
accounting.

A new root user (uid == 0) is added to the user namespace upon creation.
Such root users have full privileges and it seems that theses privileges
should be controlled through some means (process capabilities ?)

The unshare is not included in this patch.

Changes since [try #4]:
	- Updated get_user_ns and put_user_ns to accept NULL, and
	  get_user_ns to return the namespace.

Changes since [try #3]:
	- moved struct user_namespace to files user_namespace.{c,h}

Changes since [try #2]:
	- removed struct user_namespace* argument from find_user()

Changes since [try #1]:
	- removed struct user_namespace* argument from find_user()
	- added a root_user per user namespace

Signed-off-by: Cedric Le Goater <[email protected]>
Signed-off-by: Serge E. Hallyn <[email protected]>
Acked-by: Pavel Emelianov <[email protected]>
Cc: Herbert Poetzl <[email protected]>
Cc: Kirill Korotaev <[email protected]>
Cc: Eric W. Biederman <[email protected]>
Cc: Chris Wright <[email protected]>
Cc: Stephen Smalley <[email protected]>
Cc: James Morris <[email protected]>
Cc: Andrew Morgan <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Cedric Le Goater 2007-07-15 23:40:59 -07:00 • committed by Linus Torvalds
commit acce292c82
11 changed files with 137 additions and 14 deletions
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9
init/Kconfig
View file

@ -209,6 +209,15 @@ config TASK_IO_ACCOUNTING
Say N if unsure.
config USER_NS
bool "User Namespaces (EXPERIMENTAL)"
default n
depends on EXPERIMENTAL
help
Support user namespaces. This allows containers, i.e.
vservers, to use user namespaces to provide different
user info for different servers. If unsure, say N.
config AUDIT
bool "Auditing support"
depends on NET