[Sablevm-bugs] [ sablevm-Bugs-429958 ] Abortion on Linux 2.4

[<no...@so...>]

Bugs item #429958, was updated on 2001-06-03 21:06
You can respond by visiting: 
http://sourceforge.net/tracker/?func=detail&atid=105523&aid=429958&group_id=5523

Category: Execution Problem
Group: SableVM
Status: Open
Resolution: None
Priority: 5
Submitted By: Nobody/Anonymous (nobody)
>Assigned to: Etienne M. Gagnon (egagnon)
Summary: Abortion on Linux 2.4

Initial Comment:
Thank you for your great VM.
SableVM is easier to understand VM architecture.

I found a problem of abortion on VM.
The abortion takes place on Linux kernel ver. 2.4.
The cause is at about line number 97-99 in 
interpreter.c, following context;

locals = (_svmt_stack_value *) (((char *) frame) - 
method->locals_size);

Inspite of the value of 'method' is set 
NULL, 'locals_size' points c3 on my environment.

I can avoid this problem by using if statement, like 
this,

if (method != NULL) {
  locals = ...
  stack = ...
}

--

Hiro ISHIKAWA

Graduate School of Science and Engineering,
Waseda University

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>Comment By: Etienne M. Gagnon (egagnon)
Date: 2001-06-08 13:11

Message:
Logged In: YES 
user_id=15365

This is effectively a bug.  method->locals_size doesn't
dereference NULL when "method" is NULL, because the offset
of locals_size is added to it.  We must cause the
segmentation fault using a NULL dereference.  Will be fixed.

----------------------------------------------------------------------

You can respond by visiting: 
http://sourceforge.net/tracker/?func=detail&atid=105523&aid=429958&group_id=5523