diff mbox series

[v3,36/36] libsepol: validate class default targets

Message ID 20211209164928.87459-37-cgzones@googlemail.com (mailing list archive)
State Accepted
Headers show
Series libsepol: add fuzzer for reading binary policies | expand

Commit Message

Christian Göttsche Dec. 9, 2021, 4:49 p.m. UTC 
Check the class default targets are valid values, e.g. source or target
for user, role and type.

Signed-off-by: Christian Göttsche <cgzones@googlemail.com>

---
v2:
   do not reject in binary reading, but check at validation step
---
 libsepol/src/policydb_validate.c | 41 ++++++++++++++++++++++++++++++++
 1 file changed, 41 insertions(+)
diff mbox series

Patch

diff --git a/libsepol/src/policydb_validate.c b/libsepol/src/policydb_validate.c
index b2d0e5e5..0650f4d1 100644
--- a/libsepol/src/policydb_validate.c
+++ b/libsepol/src/policydb_validate.c
@@ -258,6 +258,47 @@  static int validate_class_datum(sepol_handle_t *handle, class_datum_t *class, va
 	if (class->permissions.nprim > PERM_SYMTAB_SIZE)
 		goto bad;
 
+	switch (class->default_user) {
+	case 0:
+	case DEFAULT_SOURCE:
+	case DEFAULT_TARGET:
+		break;
+	default:
+		goto bad;
+	}
+
+	switch (class->default_role) {
+	case 0:
+	case DEFAULT_SOURCE:
+	case DEFAULT_TARGET:
+		break;
+	default:
+		goto bad;
+	}
+
+	switch (class->default_type) {
+	case 0:
+	case DEFAULT_SOURCE:
+	case DEFAULT_TARGET:
+		break;
+	default:
+		goto bad;
+	}
+
+	switch (class->default_range) {
+	case 0:
+	case DEFAULT_SOURCE_LOW:
+	case DEFAULT_SOURCE_HIGH:
+	case DEFAULT_SOURCE_LOW_HIGH:
+	case DEFAULT_TARGET_LOW:
+	case DEFAULT_TARGET_HIGH:
+	case DEFAULT_TARGET_LOW_HIGH:
+	case DEFAULT_GLBLUB:
+		break;
+	default:
+		goto bad;
+	}
+
 	return 0;
 
 bad: