[PARISC] Compat signal fixes for 64-bit parisc

In copy_siginfo_from_user32:
Use compat_uptr_t. Use compat_ptr().

In copy_siginfo_to_user32:
Use compat_int_t. Use ptr_to_compat().

The sigevent_t structure has a 64-bit si_ptr field
that when copied to a 32-bit si_ptr will copy the wrong
word. For the compat copy use the si_int field instead.
Signed-off-by: Carlos O'Donell <carlos@systemhalted.org>
Signed-off-by: Kyle McMartin <kyle@parisc-linux.org>

arch/parisc/kernel/signal32.c

@@ -403,7 +403,7 @@ setup_sigcontext32(struct compat_sigcontext __user *sc, struct compat_regfile __
 int
 copy_siginfo_from_user32 (siginfo_t *to, compat_siginfo_t __user *from)
 {
-	unsigned long tmp;
+	compat_uptr_t addr;
 	int err;
 
 	if (!access_ok(VERIFY_READ, from, sizeof(compat_siginfo_t)))
@@ -426,8 +426,8 @@ copy_siginfo_from_user32 (siginfo_t *to, compat_siginfo_t __user *from)
 			err |= __get_user(to->si_uid, &from->si_uid);
 			break;
 		      case __SI_FAULT >> 16:
-			err |= __get_user(tmp, &from->si_addr);
-			to->si_addr = (void __user *) tmp;
+			err |= __get_user(addr, &from->si_addr);
+			to->si_addr = compat_ptr(addr);
 			break;
 		      case __SI_POLL >> 16:
 			err |= __get_user(to->si_band, &from->si_band);
@@ -447,7 +447,8 @@ copy_siginfo_from_user32 (siginfo_t *to, compat_siginfo_t __user *from)
 int
 copy_siginfo_to_user32 (compat_siginfo_t __user *to, siginfo_t *from)
 {
-	unsigned int addr;
+	compat_uptr_t addr;
+	compat_int_t val;
 	int err;
 
 	if (!access_ok(VERIFY_WRITE, to, sizeof(compat_siginfo_t)))
@@ -476,8 +477,8 @@ copy_siginfo_to_user32 (compat_siginfo_t __user *to, siginfo_t *from)
 			err |= __put_user(from->si_uid, &to->si_uid);
 			break;
 		case __SI_FAULT >> 16:
-			/* avoid type-checking warnings by copying _pad[0] in lieu of si_addr... */
-			err |= __put_user(from->_sifields._pad[0], &to->si_addr);
+			addr = ptr_to_compat(from->si_addr);
+			err |= __put_user(addr, &to->si_addr);
 			break;
 		case __SI_POLL >> 16:
 			err |= __put_user(from->si_band, &to->si_band);
@@ -486,15 +487,15 @@ copy_siginfo_to_user32 (compat_siginfo_t __user *to, siginfo_t *from)
 		case __SI_TIMER >> 16:
 			err |= __put_user(from->si_tid, &to->si_tid);
 			err |= __put_user(from->si_overrun, &to->si_overrun);
-			addr = (unsigned long) from->si_ptr;
-			err |= __put_user(addr, &to->si_ptr);
+			val = (compat_int_t)from->si_int;
+			err |= __put_user(val, &to->si_int);
 			break;
 		case __SI_RT >> 16:	/* Not generated by the kernel as of now.  */
 		case __SI_MESGQ >> 16:
 			err |= __put_user(from->si_uid, &to->si_uid);
 			err |= __put_user(from->si_pid, &to->si_pid);
-			addr = (unsigned long) from->si_ptr;
-			err |= __put_user(addr, &to->si_ptr);
+			val = (compat_int_t)from->si_int;
+			err |= __put_user(val, &to->si_int);
 			break;
 		}
 	}