asmlinkage long _sys_rt_sigreturn()

in kernel/signal.c [67:98]

• 20 lines of code
• 6 McCabe index (conditional complexity)

asmlinkage long _sys_rt_sigreturn(struct pt_regs *regs)
{
	struct rt_sigframe __user *frame = (struct rt_sigframe __user *)regs->sp;
	sigset_t set;

	/*
	 * Since we stacked the signal on a dword boundary,
	 * then frame should be dword aligned here.  If it's
	 * not, then the user is trying to mess with us.
	 */
	if (((unsigned long)frame) & 3)
		goto badframe;

	if (!access_ok(frame, sizeof(*frame)))
		goto badframe;
	if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set)))
		goto badframe;

	set_current_blocked(&set);

	if (restore_sigcontext(regs, &frame->uc.uc_mcontext))
		goto badframe;

	if (restore_altstack(&frame->uc.uc_stack))
		goto badframe;

	return regs->gpr[11];

badframe:
	force_sig(SIGSEGV);
	return 0;
}