sparse: annotate signal handler and ss_sp as user pointers

include/asm-i386/signal.h

@@ -4,6 +4,7 @@
 #include <linux/types.h>
 #include <linux/linkage.h>
 #include <linux/time.h>
+#include <linux/compiler.h>
 
 /* Avoid too many header ordering problems.  */
 struct siginfo;
@@ -128,7 +129,11 @@ typedef unsigned long sigset_t;
 #define SIG_SETMASK        2	/* for setting the signal mask */
 
 /* Type of a signal handler.  */
-typedef void (*__sighandler_t)(int);
+typedef void __signalfn_t(int);
+typedef __signalfn_t __user *__sighandler_t;
+
+typedef void __restorefn_t(void);
+typedef __restorefn_t __user *__sigrestore_t;
 
 #define SIG_DFL	((__sighandler_t)0)	/* default signal handling */
 #define SIG_IGN	((__sighandler_t)1)	/* ignore signal */
@@ -139,13 +144,13 @@ struct old_sigaction {
 	__sighandler_t sa_handler;
 	old_sigset_t sa_mask;
 	unsigned long sa_flags;
-	void (*sa_restorer)(void);
+	__sigrestore_t sa_restorer;
 };
 
 struct sigaction {
 	__sighandler_t sa_handler;
 	unsigned long sa_flags;
-	void (*sa_restorer)(void);
+	__sigrestore_t sa_restorer;
 	sigset_t sa_mask;		/* mask last for extensibility */
 };
 
@@ -171,7 +176,7 @@ struct sigaction {
 #endif /* __KERNEL__ */
 
 typedef struct sigaltstack {
-	void *ss_sp;
+	void __user *ss_sp;
 	int ss_flags;
 	size_t ss_size;
 } stack_t;

include/asm-ppc64/signal.h

@@ -2,6 +2,7 @@
 #define _ASMPPC64_SIGNAL_H
 
 #include <linux/types.h>
+#include <linux/compiler.h>
 #include <asm/siginfo.h>
 
 /* Avoid too many header ordering problems.  */
@@ -114,7 +115,12 @@ typedef struct {
 #define SIG_SETMASK        2	/* for setting the signal mask */
 
 /* Type of a signal handler.  */
-typedef void (*__sighandler_t)(int);
+typedef void __sigfunction(int);
+typedef __sigfunction __user * __sighandler_t;
+
+/* Type of the restorer function */
+typedef void __sigrestorer(void);
+typedef __sigrestorer __user * __sigrestorer_t;
 
 #define SIG_DFL	((__sighandler_t)0)	/* default signal handling */
 #define SIG_IGN	((__sighandler_t)1)	/* ignore signal */
@@ -124,13 +130,13 @@ struct old_sigaction {
 	__sighandler_t sa_handler;
 	old_sigset_t sa_mask;
 	unsigned long sa_flags;
-	void (*sa_restorer)(void);
+	__sigrestorer_t sa_restorer;
 };
 
 struct sigaction {
 	__sighandler_t sa_handler;
 	unsigned long sa_flags;
-	void (*sa_restorer)(void);
+	__sigrestorer_t sa_restorer;
 	sigset_t sa_mask;		/* mask last for extensibility */
 };
 
@@ -139,7 +145,7 @@ struct k_sigaction {
 };
 
 typedef struct sigaltstack {
-	void *ss_sp;
+	void __user *ss_sp;
 	int ss_flags;
 	size_t ss_size;
 } stack_t;

kernel/signal.c

@@ -157,7 +157,7 @@ static kmem_cache_t *sigqueue_cachep;
 
 static int sig_ignored(struct task_struct *t, int sig)
 {
-	void * handler;
+	void __user * handler;
 
 	/*
 	 * Tracers always want to know about signals..
@@ -2362,13 +2362,13 @@ do_sigaltstack (const stack_t __user *uss, stack_t __user *uoss, unsigned long s
 	int error;
 
 	if (uoss) {
-		oss.ss_sp = (void *) current->sas_ss_sp;
+		oss.ss_sp = (void __user *) current->sas_ss_sp;
 		oss.ss_size = current->sas_ss_size;
 		oss.ss_flags = sas_ss_flags(sp);
 	}
 
 	if (uss) {
-		void *ss_sp;
+		void __user *ss_sp;
 		size_t ss_size;
 		int ss_flags;