---

yaml --- r: 79711 b: refs/heads/master c: 83bd010 h: refs/heads/master i: 79709: e7ab36b 79707: a861994 79703: 93ff2e0 79695: 1506c9b 79679: 8cb61a4 v: v3
git-mirror · Jan 30, 2008 · 963696a · 963696a
1 parent 51cb151
commit 963696a
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Showing 2 changed files with 8 additions and 1 deletion.
diff --git a/[refs] b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: f9fc58910ebc448b0b7d37af1bf57a896a78e9c4
+refs/heads/master: 83bd01024b1fdfc41d9b758e5669e80fca72df66
diff --git a/trunk/arch/x86/kernel/signal_32.c b/trunk/arch/x86/kernel/signal_32.c
@@ -295,6 +295,13 @@ get_sigframe(struct k_sigaction *ka, struct pt_regs * regs, size_t frame_size)
 	/* Default to using normal stack */
 	esp = regs->esp;
 
+	/*
+	 * 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 (on_sig_stack(esp) && !likely(on_sig_stack(esp - frame_size)))
+		return (void __user *) -1L;
+
 	/* This is the X/Open sanctioned signal stack switching.  */
 	if (ka->sa.sa_flags & SA_ONSTACK) {
 		if (sas_ss_flags(esp) == 0)