2 files changed, 15 insertions, 0 deletions

diff --git a/include/linux/compat.h b/include/linux/compat.h
index 7f0c1dd09079..ec1aee4aec9c 100644
--- a/include/linux/compat.h
+++ b/include/linux/compat.h
@@ -669,6 +669,13 @@ asmlinkage long compat_sys_sigaltstack(const compat_stack_t __user *uss_ptr,
 
 int compat_restore_altstack(const compat_stack_t __user *uss);
 int __compat_save_altstack(compat_stack_t __user *, unsigned long);
+#define compat_save_altstack_ex(uss, sp) do { \
+        compat_stack_t __user *__uss = uss; \
+        struct task_struct *t = current; \
+        put_user_ex(ptr_to_compat((void __user *)t->sas_ss_sp), &__uss->ss_sp); \
+        put_user_ex(sas_ss_flags(sp), &__uss->ss_flags); \
+        put_user_ex(t->sas_ss_size, &__uss->ss_size); \
+} while (0);
 
 asmlinkage long compat_sys_sched_rr_get_interval(compat_pid_t pid,
                                                  struct compat_timespec __user *interval);
diff --git a/include/linux/signal.h b/include/linux/signal.h
index d897484730c0..2ac423bdb676 100644
--- a/include/linux/signal.h
+++ b/include/linux/signal.h
@@ -434,6 +434,14 @@ void signals_init(void);
 int restore_altstack(const stack_t __user *);
 int __save_altstack(stack_t __user *, unsigned long);
 
+#define save_altstack_ex(uss, sp) do { \
+        stack_t __user *__uss = uss; \
+        struct task_struct *t = current; \
+        put_user_ex((void __user *)t->sas_ss_sp, &__uss->ss_sp); \
+        put_user_ex(sas_ss_flags(sp), &__uss->ss_flags); \
+        put_user_ex(t->sas_ss_size, &__uss->ss_size); \
+} while (0);
+
 #ifdef CONFIG_PROC_FS
 struct seq_file;
 extern void render_sigset_t(struct seq_file *, const char *, sigset_t *);