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authorEric W. Biederman <ebiederm@xmission.com>2011-11-17 10:23:55 -0800
committerEric W. Biederman <ebiederm@xmission.com>2012-04-07 17:11:01 -0700
commit5673a94c14574d7c6495c320c6b0e480673d54bd (patch)
treebb715a6551732475aaa6870f08da8d49529ee82d /init/Kconfig
parent7a4e7408c5cadb240e068a662251754a562355e3 (diff)
downloadlinux-linaro-stable-5673a94c14574d7c6495c320c6b0e480673d54bd.tar.gz
userns: Add a Kconfig option to enforce strict kuid and kgid type checks
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>
Diffstat (limited to 'init/Kconfig')
-rw-r--r--init/Kconfig12
1 files changed, 11 insertions, 1 deletions
diff --git a/init/Kconfig b/init/Kconfig
index 72f33faca44f..86cf760893b3 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -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