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new helpers: __save_altstack/__compat_save_altstack, switch x86 and um to those

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note that they are relying on access_ok() already checked by caller.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2012-11-20 14:24:26 -05:00
commit c40702c49f
6 changed files with 25 additions and 25 deletions
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16
kernel/signal.c
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@ -3117,6 +3117,14 @@ int restore_altstack(const stack_t __user *uss)
return err == -EFAULT ? err : 0;
}
int __save_altstack(stack_t __user *uss, unsigned long sp)
{
struct task_struct *t = current;
return __put_user((void __user *)t->sas_ss_sp, &uss->ss_sp) |
__put_user(sas_ss_flags(sp), &uss->ss_flags) |
__put_user(t->sas_ss_size, &uss->ss_size);
}
#ifdef CONFIG_COMPAT
#ifdef CONFIG_GENERIC_SIGALTSTACK
asmlinkage long compat_sys_sigaltstack(const compat_stack_t __user *uss_ptr,
@ -3158,6 +3166,14 @@ int compat_restore_altstack(const compat_stack_t __user *uss)
/* squash all but -EFAULT for now */
return err == -EFAULT ? err : 0;
}
int __compat_save_altstack(compat_stack_t __user *uss, unsigned long sp)
{
struct task_struct *t = current;
return __put_user(ptr_to_compat((void __user *)t->sas_ss_sp), &uss->ss_sp) |
__put_user(sas_ss_flags(sp), &uss->ss_flags) |
__put_user(t->sas_ss_size, &uss->ss_size);
}
#endif
#endif