On Fri, Jan 18, 2013 at 05:54:33PM +0530, Vineet Gupta wrote:
> +SYSCALL_DEFINE0(rt_sigreturn)
> +{
> + struct rt_sigframe __user *sf;
> + unsigned int magic;
> + int err;
> + struct pt_regs *regs = task_pt_regs(current);
ITYM current_pt_regs()...
> + if (unlikely(is_do_ss_needed(magic)))
> + if (do_sigaltstack(&sf->uc.uc_stack, NULL, regs->sp) == -EFAULT)
if (!restore_altstack(&sf->uc.uc_stack))
please...
> + stk.ss_sp = (void __user *)current->sas_ss_sp;
> + stk.ss_flags = sas_ss_flags(regs->sp);
> + stk.ss_size = current->sas_ss_size;
> + err |= __copy_to_user(&sf->uc.uc_stack, &stk, sizeof(stk));
that would be
err |= __save_altstack(&frame->uc.uc_stack, regs->sp);
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