audit: only allow tasks to set their loginuid if it is -1

[~andy/linux] / init / Kconfig

diff --git a/init/Kconfig b/init/Kconfig
index a075765d5fbe4b85ca033708f454de38c3ea3798..5ad8b775f2ac26f79497773d107d8faae123d24b 100644 (file)
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -372,6 +372,20 @@ config AUDIT_TREE
        depends on AUDITSYSCALL
        select FSNOTIFY
 
+config AUDIT_LOGINUID_IMMUTABLE
+       bool "Make audit loginuid immutable"
+       depends on AUDIT
+       help
+         The config option toggles if a task setting it's loginuid requires
+         CAP_SYS_AUDITCONTROL or if that task should require no special permissions
+         but should instead only allow setting its loginuid if it was never
+         previously set.  On systems which use systemd or a similar central
+         process to restart login services this should be set to true.  On older
+         systems in which an admin would typically have to directly stop and
+         start processes this should be set to false.  Setting this to true allows
+         one to drop potentially dangerous capabilites from the login tasks,
+         but may not be backwards compatible with older init systems.
+
 source "kernel/irq/Kconfig"
 
 menu "RCU Subsystem"