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userns: Add a Kconfig option to enforce strict kuid and kgid type checks

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Make it possible to easily switch between strong mandatory
type checks and relaxed type checks so that the code can
easily be tested with the type checks and then built
with the strong type checks disabled so the resulting
code can be used.

Require strong mandatory type checks when enabling the user namespace.
It is very simple to make a typo and use the wrong type allowing
conversions to/from userspace values to be bypassed by accident,
the strong type checks prevent this.

Acked-by: Serge Hallyn <serge.hallyn@canonical.com>
Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
This commit is contained in:
Eric W. Biederman 2011-11-17 10:23:55 -08:00
parent 7a4e7408c5
commit 5673a94c14
2 changed files with 12 additions and 2 deletions
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2
include/linux/uidgid.h
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@ -17,7 +17,7 @@
struct user_namespace;
extern struct user_namespace init_user_ns;
#if defined(NOTYET)
#ifdef CONFIG_UIDGID_STRICT_TYPE_CHECKS
typedef struct {
uid_t val;

12
init/Kconfig
View File

@ -828,7 +828,8 @@ config IPC_NS
config USER_NS
bool "User namespace (EXPERIMENTAL)"
depends on EXPERIMENTAL
default y
select UIDGID_STRICT_TYPE_CHECKS
default n
help
This allows containers, i.e. vservers, to use user namespaces
to provide different user info for different servers.
@ -852,6 +853,15 @@ config NET_NS
endif # NAMESPACES
config UIDGID_STRICT_TYPE_CHECKS
bool "Require conversions between uid/gids and their internal representation"
default n
help
While the nececessary conversions are being added to all subsystems this option allows
the code to continue to build for unconverted subsystems.
Say Y here if you want the strict type checking enabled
config SCHED_AUTOGROUP
bool "Automatic process group scheduling"
select EVENTFD