signal/arm32: copy the whole rt_sa_mask

I wounder, was it ever working on ARM32?
Maybe I don't get this code right?

Cc: Christopher Covington <cov@codeaurora.org>
Cc: Cyrill Gorcunov <gorcunov@openvz.org>
Signed-off-by: Dmitry Safonov <dsafonov@virtuozzo.com>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>

criu/cr-restore.c

@@ -317,7 +317,8 @@ static int restore_one_sigaction(int sig, struct cr_img *img, int pid)
 	ASSIGN_TYPED(act.rt_sa_handler, decode_pointer(e->sigaction));
 	ASSIGN_TYPED(act.rt_sa_flags, e->flags);
 	ASSIGN_TYPED(act.rt_sa_restorer, decode_pointer(e->restorer));
-	ASSIGN_TYPED(act.rt_sa_mask.sig[0], e->mask);
+	BUILD_BUG_ON(sizeof(e->mask) != sizeof(act.rt_sa_mask.sig));
+	memcpy(act.rt_sa_mask.sig, &e->mask, sizeof(act.rt_sa_mask.sig));
 
 	sa_entry__free_unpacked(e, NULL);
 

criu/parasite-syscall.c

@@ -673,7 +673,8 @@ int parasite_dump_sigacts_seized(struct parasite_ctl *ctl, struct cr_imgset *cr_
 		ASSIGN_TYPED(se.sigaction, encode_pointer(args->sas[i].rt_sa_handler));
 		ASSIGN_TYPED(se.flags, args->sas[i].rt_sa_flags);
 		ASSIGN_TYPED(se.restorer, encode_pointer(args->sas[i].rt_sa_restorer));
-		ASSIGN_TYPED(se.mask, args->sas[i].rt_sa_mask.sig[0]);
+		BUILD_BUG_ON(sizeof(se.mask) != sizeof(args->sas[0].rt_sa_mask.sig));
+		memcpy(&se.mask, args->sas[i].rt_sa_mask.sig, sizeof(se.mask));
 
 		if (pb_write_one(img, &se, PB_SIGACT) < 0)
 			return -1;