selinux: randomize layout of key structures
Randomize the layout of key selinux data structures.
Initially this is applied to the selinux_state, selinux_ss,
policydb, and task_security_struct data structures.
NB To test/use this mechanism, one must install the
necessary build-time dependencies, e.g. gcc-plugin-devel on Fedora,
and enable CONFIG_GCC_PLUGIN_RANDSTRUCT in the kernel configuration.
Signed-off-by: Stephen Smalley <[email protected]>
Reviewed-by: Kees Cook <[email protected]>
[PM: double semi-colon fixed]
Signed-off-by: Paul Moore <[email protected]>
diff --git a/security/selinux/include/objsec.h b/security/selinux/include/objsec.h
index a4a86cb..330b7b6 100644
--- a/security/selinux/include/objsec.h
+++ b/security/selinux/include/objsec.h
@@ -35,7 +35,7 @@ struct task_security_struct {
u32 create_sid; /* fscreate SID */
u32 keycreate_sid; /* keycreate SID */
u32 sockcreate_sid; /* fscreate SID */
-};
+} __randomize_layout;
enum label_initialized {
LABEL_INVALID, /* invalid or not initialized */
diff --git a/security/selinux/include/security.h b/security/selinux/include/security.h
index af623f0..ecdd610 100644
--- a/security/selinux/include/security.h
+++ b/security/selinux/include/security.h
@@ -110,7 +110,7 @@ struct selinux_state {
bool policycap[__POLICYDB_CAPABILITY_MAX];
struct selinux_avc *avc;
struct selinux_ss *ss;
-};
+} __randomize_layout;
void selinux_ss_init(struct selinux_ss **ss);
void selinux_avc_init(struct selinux_avc **avc);
diff --git a/security/selinux/ss/policydb.h b/security/selinux/ss/policydb.h
index bc56b14e..69b24191 100644
--- a/security/selinux/ss/policydb.h
+++ b/security/selinux/ss/policydb.h
@@ -307,7 +307,7 @@ struct policydb {
u16 process_class;
u32 process_trans_perms;
-};
+} __randomize_layout;
extern void policydb_destroy(struct policydb *p);
extern int policydb_load_isids(struct policydb *p, struct sidtab *s);
diff --git a/security/selinux/ss/services.h b/security/selinux/ss/services.h
index fc40640..c5896f3 100644
--- a/security/selinux/ss/services.h
+++ b/security/selinux/ss/services.h
@@ -31,7 +31,7 @@ struct selinux_ss {
struct selinux_map map;
struct page *status_page;
struct mutex status_lock;
-};
+} __randomize_layout;
void services_compute_xperms_drivers(struct extended_perms *xperms,
struct avtab_node *node);
