From: Jeff Xu <jeffxu@xxxxxxxxxxxx>
When SECURITY_SELINUX_DEVELOP=y and the system is running in permissive
mode, it is useful to disable logging from permissive domain, so audit
log does not get spamed.
Signed-off-by: Jeff Xu <jeffxu@xxxxxxxxxxxx>
Signed-off-by: Luis Hector Chavez <lhchavez@xxxxxxxxxx>
Tested-by: Luis Hector Chavez <lhchavez@xxxxxxxxxxxx>
Tested-by: Jeff Xu<jeffxu@xxxxxxxxxxxx>
---
security/selinux/Kconfig | 10 ++++++++++
security/selinux/avc.c | 9 +++++++++
2 files changed, 19 insertions(+)
diff --git a/security/selinux/Kconfig b/security/selinux/Kconfig
index 9e921fc72538..99b8b88abc3d 100644
--- a/security/selinux/Kconfig
+++ b/security/selinux/Kconfig
@@ -61,6 +61,16 @@ config SECURITY_SELINUX_DEVELOP
permissive mode (if permitted by the policy) via
/sys/fs/selinux/enforce.
+config SECURITY_SELINUX_PERMISSIVE_DONTAUDIT
+ bool "NSA SELinux don't audit permissive"
+ depends on SECURITY_SELINUX
+ default n
+ help
+ This prevents logging when permissive=1. If unsure, say N. With
+ this option enabled, any avc logs that would occur on a permissive
+ domain won't be logged. This can prevent a significant amount of
+ logspam.
+
config SECURITY_SELINUX_AVC_STATS
bool "NSA SELinux AVC Statistics"
depends on SECURITY_SELINUX
diff --git a/security/selinux/avc.c b/security/selinux/avc.c
index 9a43af0ebd7d..2f0a49d7c714 100644
--- a/security/selinux/avc.c
+++ b/security/selinux/avc.c
@@ -777,6 +777,15 @@ noinline int slow_avc_audit(struct selinux_state *state,
if (WARN_ON(!tclass || tclass >= ARRAY_SIZE(secclass_map)))
return -EINVAL;
+ /*
+ * Avoid logging permissive=1 messages for
+ * SECURITY_SELINUX_PERMISSIVE_DONTAUDIT.
+ */
+ if (IS_ENABLED(CONFIG_SECURITY_SELINUX_PERMISSIVE_DONTAUDIT) && denied
+ && !result) {
+ return 0;
+ }
+
if (!a) {
a = &stack_data;
a->type = LSM_AUDIT_DATA_NONE;
--
2.37.3.968.ga6b4b080e4-goog
