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x86: get rid of put_user_try in {ia32,x32}_setup_rt_frame()

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Straightforward, except for compat_save_altstack_ex() stuck in those.
Replace that thing with an analogue that would use unsafe_put_user()
instead of put_user_ex() (called unsafe_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 18:39:17 -05:00
parent d2d2728d16
commit 39f16c1c0f
3 changed files with 49 additions and 43 deletions
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9
include/linux/compat.h
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@ -483,12 +483,13 @@ extern void __user *compat_alloc_user_space(unsigned long len);
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 { \
#define unsafe_compat_save_altstack(uss, sp, label) 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(t->sas_ss_flags, &__uss->ss_flags); \
put_user_ex(t->sas_ss_size, &__uss->ss_size); \
unsafe_put_user(ptr_to_compat((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);