Re: [PATCH] consider stack access while checking for alternatesignal stack

[Roland McGrath]

AFAICT all you want is the following, and I'm not sure it requires all that
much explanation.  I've probably missed some subtlety.


Thanks,
Roland

--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -2090,7 +2090,13 @@ static inline int is_si_special(const struct siginfo *info)
 
 static inline int on_sig_stack(unsigned long sp)
 {
-	return (sp - current->sas_ss_sp < current->sas_ss_size);
+#ifdef CONFIG_STACK_GROWSUP
+	return sp >= current->sas_ss_sp &&
+		sp - current->sas_ss_sp < current->sas_ss_size;
+#else
+	return sp > current->sas_ss_sp &&
+		sp - current->sas_ss_sp <= current->sas_ss_size;
+#endif
 }
 
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