---

yaml
---
r: 86885
b: refs/heads/master
c: 86dffa4
h: refs/heads/master
i:
  86883: c58ae79
v: v3

[refs]

@@ -1,2 +1,2 @@
 ---
-refs/heads/master: d7a6c68a2f991b18e61ebfe0251ab42c054d9a1d
+refs/heads/master: 86dffa4cd1a1d61fed68ab64c674d4094f2bdfe4

trunk/arch/ia64/ia32/ia32_signal.c

@@ -766,8 +766,19 @@ get_sigframe (struct k_sigaction *ka, struct pt_regs * regs, size_t frame_size)
 
 	/* This is the X/Open sanctioned signal stack switching.  */
 	if (ka->sa.sa_flags & SA_ONSTACK) {
-		if (!on_sig_stack(esp))
+		int onstack = sas_ss_flags(esp);
+
+		if (onstack == 0)
 			esp = current->sas_ss_sp + current->sas_ss_size;
+		else if (onstack == SS_ONSTACK) {
+			/*
+			 * If we are on the alternate signal stack and would
+			 * overflow it, don't. Return an always-bogus address
+			 * instead so we will die with SIGSEGV.
+			 */
+			if (!likely(on_sig_stack(esp - frame_size)))
+				return (void __user *) -1L;
+		}
 	}
 	/* Legacy stack switching not supported */