[RFC PATCH v3 11/12] security/apparmor: Add enclave_load() implementation

[Sean Christopherson <sean.j.christopherson@intel.com>]

Require execute permissions when loading an enclave from a file.

Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
---
 security/apparmor/include/audit.h |  2 ++
 security/apparmor/lsm.c           | 14 ++++++++++++++
 2 files changed, 16 insertions(+)

diff --git a/security/apparmor/include/audit.h b/security/apparmor/include/audit.h
index ee559bc2acb8..84470483e04d 100644
--- a/security/apparmor/include/audit.h
+++ b/security/apparmor/include/audit.h
@@ -107,6 +107,8 @@ enum audit_type {
 #define OP_PROF_LOAD "profile_load"
 #define OP_PROF_RM "profile_remove"
 
+#define OP_ENCL_LOAD "enclave_load"
+
 
 struct apparmor_audit_data {
 	int error;
diff --git a/security/apparmor/lsm.c b/security/apparmor/lsm.c
index 87500bde5a92..2ed1157e1f58 100644
--- a/security/apparmor/lsm.c
+++ b/security/apparmor/lsm.c
@@ -517,6 +517,17 @@ static int apparmor_file_mprotect(struct vm_area_struct *vma,
 			   !(vma->vm_flags & VM_SHARED) ? MAP_PRIVATE : 0);
 }
 
+#ifdef CONFIG_INTEL_SGX
+static int apparmor_enclave_load(struct vm_area_struct *vma, unsigned long prot,
+				bool measured)
+{
+	if (!(prot & PROT_EXEC))
+		return 0;
+
+	return common_file_perm(OP_ENCL_LOAD, vma->vm_file, AA_EXEC_MMAP);
+}
+#endif
+
 static int apparmor_sb_mount(const char *dev_name, const struct path *path,
 			     const char *type, unsigned long flags, void *data)
 {
@@ -1243,6 +1254,9 @@ static struct security_hook_list apparmor_hooks[] __lsm_ro_after_init = {
 	LSM_HOOK_INIT(secid_to_secctx, apparmor_secid_to_secctx),
 	LSM_HOOK_INIT(secctx_to_secid, apparmor_secctx_to_secid),
 	LSM_HOOK_INIT(release_secctx, apparmor_release_secctx),
+#ifdef CONFIG_INTEL_SGX
+	LSM_HOOK_INIT(enclave_load, apparmor_enclave_load),
+#endif
 };
 
 /*
-- 
2.21.0