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

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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.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2020-02-15 19:54:56 -05:00
parent 57d563c829
commit 119cd59fcf
2 changed files with 51 additions and 46 deletions
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8
include/linux/signal.h
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@ -444,12 +444,12 @@ 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 { \
#define unsafe_save_altstack(uss, sp, label) 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(t->sas_ss_flags, &__uss->ss_flags); \
put_user_ex(t->sas_ss_size, &__uss->ss_size); \
unsafe_put_user((void __user *)t->sas_ss_sp, &__uss->ss_sp, label); \
unsafe_put_user(t->sas_ss_flags, &__uss->ss_flags, label); \
unsafe_put_user(t->sas_ss_size, &__uss->ss_size, label); \
if (t->sas_ss_flags & SS_AUTODISARM) \
sas_ss_reset(t); \
} while (0);