audit,module: restore audit logging in load failure case

The move of the module sanity check to earlier skipped the audit logging
call in the case of failure and to a place where the previously used
context is unavailable.

Add an audit logging call for the module loading failure case and get
the module name when possible.

Link: https://issues.redhat.com/browse/RHEL-52839
Fixes: 02da2cb ("module: move check_modinfo() early to early_mod_check()")
Signed-off-by: Richard Guy Briggs <rgb@redhat.com>
Reviewed-by: Petr Pavlu <petr.pavlu@suse.com>
Signed-off-by: Paul Moore <paul@paul-moore.com>

Author: rgbriggs

include/linux/audit.h

@@ -417,7 +417,7 @@ extern int __audit_log_bprm_fcaps(struct linux_binprm *bprm,
 extern void __audit_log_capset(const struct cred *new, const struct cred *old);
 extern void __audit_mmap_fd(int fd, int flags);
 extern void __audit_openat2_how(struct open_how *how);
-extern void __audit_log_kern_module(char *name);
+extern void __audit_log_kern_module(const char *name);
 extern void __audit_fanotify(u32 response, struct fanotify_response_info_audit_rule *friar);
 extern void __audit_tk_injoffset(struct timespec64 offset);
 extern void __audit_ntp_log(const struct audit_ntp_data *ad);
@@ -519,7 +519,7 @@ static inline void audit_openat2_how(struct open_how *how)
 		__audit_openat2_how(how);
 }
 
-static inline void audit_log_kern_module(char *name)
+static inline void audit_log_kern_module(const char *name)
 {
 	if (!audit_dummy_context())
 		__audit_log_kern_module(name);
@@ -677,9 +677,8 @@ static inline void audit_mmap_fd(int fd, int flags)
 static inline void audit_openat2_how(struct open_how *how)
 { }
 
-static inline void audit_log_kern_module(char *name)
-{
-}
+static inline void audit_log_kern_module(const char *name)
+{ }
 
 static inline void audit_fanotify(u32 response, struct fanotify_response_info_audit_rule *friar)
 { }

kernel/audit.h

@@ -200,7 +200,7 @@ struct audit_context {
 			int			argc;
 		} execve;
 		struct {
-			char			*name;
+			const char		*name;
 		} module;
 		struct {
 			struct audit_ntp_data	ntp_data;

kernel/auditsc.c

@@ -2864,7 +2864,7 @@ void __audit_openat2_how(struct open_how *how)
 	context->type = AUDIT_OPENAT2;
 }
 
-void __audit_log_kern_module(char *name)
+void __audit_log_kern_module(const char *name)
 {
 	struct audit_context *context = audit_context();
 

kernel/module/main.c

@@ -3368,7 +3368,7 @@ static int load_module(struct load_info *info, const char __user *uargs,
 
 	module_allocated = true;
 
-	audit_log_kern_module(mod->name);
+	audit_log_kern_module(info->name);
 
 	/* Reserve our place in the list. */
 	err = add_unformed_module(mod);
@@ -3532,8 +3532,10 @@ static int load_module(struct load_info *info, const char __user *uargs,
 	 * failures once the proper module was allocated and
 	 * before that.
 	 */
-	if (!module_allocated)
+	if (!module_allocated) {
+		audit_log_kern_module(info->name ? info->name : "?");
 		mod_stat_bump_becoming(info, flags);
+	}
 	free_copy(info, flags);
 	return err;
 }