x86: get rid of put_user_try in __setup_rt_frame() (both 32bit and 64bit)

Straightforward, except for save_altstack_ex() stuck in those. Replace that thing with an analogue that would use unsafe_put_user() instead of put_user_ex() (called compat_save_altstack()) and be done with that.

Al Viro committed 6 years ago

Commit 119cd591 parent 57d563c2 files · +52 −47Browse files

Showing the changes to include/linux (1 of 2 files). Show all

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include/linux/signal.h+4−4

@@ -444,12 +444,12 @@ void signals_init(void); · 443 unmodified lines
444	444	int restore_altstack(const stack_t __user *);
445	445	int __save_altstack(stack_t __user *, unsigned long);
446	446
447		−#define save_altstack_ex(uss, sp) do { \
	447	+#define unsafe_save_altstack(uss, sp, label) do { \
448	448	stack_t __user *__uss = uss; \
449	449	struct task_struct *t = current; \
450		− put_user_ex((void __user *)t->sas_ss_sp, &__uss->ss_sp); \
451		− put_user_ex(t->sas_ss_flags, &__uss->ss_flags); \
452		− put_user_ex(t->sas_ss_size, &__uss->ss_size); \
	450	+ unsafe_put_user((void __user *)t->sas_ss_sp, &__uss->ss_sp, label); \
	451	+ unsafe_put_user(t->sas_ss_flags, &__uss->ss_flags, label); \
	452	+ unsafe_put_user(t->sas_ss_size, &__uss->ss_size, label); \
453	453	if (t->sas_ss_flags & SS_AUTODISARM) \
454	454	sas_ss_reset(t); \
455	455	} while (0);