Alexander Nasonov's shared items

Wednesday, November 04, 2009

Tuesday, November 03, 2009

LuaJIT 2.0.0-beta1

New version of LuaJIT is very impressive. Take a deep breath ...

Mike Pall wrote:
> As I've already said in a reddit comment:
> 
>   Heh, it beats Intel Fortran on two numeric benchmarks (mandelbrot
>   and spectralnorm). 
>
>   Only the hand-vectorized stuff in C and C++ is faster. Guess I
>   need to add auto-vectorization. Well, maybe next week ... 
> 
> --Mike

More technical details are available in Mike's message LuaJIT 2.0 intellectual property disclosure and research opportunities.

Saturday, October 10, 2009

mmap'ing to address 0x0

Date: Fri, 09 Oct 2009 22:01:07 -0600                                                   
From: Theo de Raadt <deraadt@cvs.openbsd.org>                                           
To: Luis Useche <useche@gmail.com>                                     
cc: misc <misc@openbsd.org>                                                             
Subject: Re: mmap'ing to address 0x0                                                    
                                                                                        
> I was reading some information that indicated that letting user                       
> process to map to address 0x0 can exploit some kernel NULL-pointer                    
> bugs. I checked how different operating systems mitigate this problem                 
> and I found information about Linux and FreeBSD. I was trying to find                 
> the same information for OpenBSD with no luck. Can anybody help me                    
> with this one?                                                                        
                                                                                        
We have been aware of the particular problem (which results from an                     
architectural decision made by some machines) for many years, and it                    
took us a long time to decide what to do.  Eventually we decided to                     
make userland suffer.  Unfortunately we only fixed it in the middle of                  
last year.                                                                              
                                                                                        
Other platforms do not have this problem, since the kernel runs in                      
an un-shared address space.

CVSROOT:        /cvs                                                                    
Module name:    src                                                                     
Changes by:     deraadt@cvs.openbsd.org 2008/06/24 15:24:03                             
                                                                                        
Modified files:                                                                         
        sys/arch/alpha/include: vmparam.h                                               
        sys/arch/amd64/include: vmparam.h                                               
        sys/arch/arm/include: vmparam.h                                                 
        sys/arch/i386/include: vmparam.h                                                
        sys/arch/sh/include: vmparam.h                                                  
        sys/arch/sparc/include: vmparam.h                                               
        sys/arch/vax/include: vmparam.h                                                 
        sys/arch/sh/sh : trap.c                                                         
                                                                                        
Log message:                                                                            
On user/kernel shared page table machines, do not let processes map their               
own page 0, as discussed with miod (and many others previously, including               
art and toby).  On sparc, make this __LDPGSZ because PAGE_SIZE is non-constant          
ok miod tedu

Wednesday, October 07, 2009

Hello World from Lua

The lua program below prints 'Hello World from Lua'. Enjoy!
                                                                _={_=_G
                                                              }for--[[--]]__
                                                            in(next),_["_"]do
                                                           (_)[_]=(__)_[#_[_]]
                                                          =_[_]_[_]="sub"end(_)
                              [_]=_[_]                    [_[_]]_[_._]=#"_._"_[
                       _[_._]]=_[_](_[_[_._]*_             [_._]],_[_._],_[_._
                    ]).._[_](_[(_[_._]+_[_._]/_[_._         ])*_[_._]],_[_._]/
                _[_._]+_[_._]/_[_._],_[_._]).._[_](_[_       [_._]*_[_._]],_
             [_._]+_[_._]-_[_._]/_[_._],_[_._]+_[_._]-_[       _._]/_[_._]
           ).._[_](_[_[_._]*_[_._]],_[_._],_[_._]).._[_](_[         _
         [_._]*_[_._]],_[_._]/_[_._]-_[_._]           ,_[_._
        ]/_[_._]-_[_._])_[_[_._]*_[_._]+_               [_._]-
      _[_._]/_[_._]]=(_)_[_[_._]*_[_._]+                  _[_._
     ]+_[_._]/_[_._]]=(_)_[#_+_[_._]/_[                    _._]]
    =_._[_[#_-_[_._]-#_/#_]]_[_[#_]]=_[                    #_](_[
   _[_._]].."(".._[#_-#_/_[_._]].."('"                     .._[_[_
  ._]]..[[("\\'..(...+#_*(_[_._]+_[_._]                   ))..'")')
  )()]])_[_[#_]]=_[_[_._]][_[_[#_]](_[_.                 _]*_[_._])
 .._[_[#_]](#_-_[_._]/_[_._]).._[_[#_]](_               [_._]+_[_._]
 +_[_._]/_[_._]).._[_[#_]](_[_._]^_[_._]-_[_         ._])]_[_[_[#_]](
 #_)]=#_*#_/_[_._]_[_[_[#_]](#_)]=_[_[_[#_]](#_)]+_[_[_[#_]](#_)]/_[(
 _._)]_._[_[    _[#_]](_[_[_[#_]](#_)]+#_-_[_._],_[_[_[#_]](#_)]+#_-
 #_/#_,_[_[_[   #_]](#_)]+#_/_[_._],_[_[_[#_]](#_)]+#_-#_/_[_._], _[
 _[_[#_]](#_)   ]+#_+#_/#_)](_[_[#_+_[_._]-_[_._]]](#_*#_/_[_._]-_[_.
 _],_[_[_[#_]   ](#_)]+_[_._]    /_[_.   _],_[  _    [_[#_]](#_)]+#_
 /_[_._]+_[_.   _],_[_[_[#_]](   #_)]+   #_/   _[_.   _]+_[_._],_[_[
  _[#_]](#_)]   +#_-_[_._]-_[_   ._]/_   [_._  ],#_   +#_+_[_._]-_[
  _._]/_[_._]   ,#_*(_[_._]+_[   _._])   -_[_.    _   ],_[_[_[#_]](
   #_)]+#_-_[   _._]-_[_._ ]/_   [_._]   ,_[_   [_[   #_]](#_)]+#_
    -#_/#_,_[   _[_[#_]](  #_)   ]+#_/   _[_   ._]+   _[_._],_[_[
     _[#_]](     #_)],#   _+#_    +#       _    /# _  + #_/#_,_[_
     [_[#_               ]](#_)     ]+_   [_._    ]-_  [_._]/_[_
      ._],_[_[_[#_]](#_)]+#_-_[_._]/_[_._],(_[_._])^_[_._]*(_[
        _._]+_[_._]/_[_._])+_[_._],_[_[_[#_]](#_)]+_[_._]*_[_
         ._],#_+#_+#_/#_+#_/#_,#_*#_/_[_._]+_[_[_[#_]](#_)]/
            _[_[_[#_]](#_)],_[_[_[#_]](#_)]+#_+_[_[_[#_]](
              #_)]/_[_[_[#_]](#_)]+_[_[_[#_]](#_)]/_[_[
                 _[#_]](#_)],_[_[_[#_]](#_)]-_[_._]))
                    _._=_[_[_._]][_[_[_[#_]](#_)]
                         ]_[(#_)^#_-(#_)-#_]=
                                 _._
Code from http://codepad.org/cmQIjdzI.

Friday, September 18, 2009

pkgsrc/lang/gcc44

We've been waiting for update for a long time, the previous version in pkgsrc is lang/gcc34 (wip/gcc42 doesn't count ;-)
Module Name:    pkgsrc
Committed By:   dmcmahill
Date:           Fri Sep 18 11:24:50 UTC 2009

Update of /cvsroot/pkgsrc/lang/gcc44
In directory ivanova.netbsd.org:/tmp/cvs-serv5730

Log Message:
Import gcc-4.4.1 as lang/gcc44.  This is the latest branch of gcc.
Of particular note is this package contains gfortran which is required
for building some scientific software (recent versions of scilab
for example).  Package is prepared as a monolithic install of gcc
since gcc is really not set up to build and install the core and then
later add on different languages as their own packages.

Status:

Vendor Tag:     TNF
Release Tags:   pkgsrc-base
                
N pkgsrc/lang/gcc44/buildlink3.mk
N pkgsrc/lang/gcc44/Makefile
N pkgsrc/lang/gcc44/DESCR
N pkgsrc/lang/gcc44/MESSAGE
N pkgsrc/lang/gcc44/preconfigure.mk
N pkgsrc/lang/gcc44/distinfo
N pkgsrc/lang/gcc44/patches/patch-ad
N pkgsrc/lang/gcc44/patches/patch-aa
N pkgsrc/lang/gcc44/patches/patch-ab
N pkgsrc/lang/gcc44/patches/patch-ae
N pkgsrc/lang/gcc44/patches/patch-ac
N pkgsrc/lang/gcc44/files/i386-dragonfly64.h
N pkgsrc/lang/gcc44/files/dragonfly-spec.h
N pkgsrc/lang/gcc44/files/dragonfly.h
N pkgsrc/lang/gcc44/files/i386-dragonfly.h
N pkgsrc/lang/gcc44/files/hello.f
N pkgsrc/lang/gcc44/files/hello.m

No conflicts created by this import

Wednesday, September 16, 2009

Multiline comments in shell with here-document

Did you know that you can use multiple lines in shell with the ":" command and a here-document? The following example is inspired by two scripts from SHELLdorado:
: <<!
if ! file .; then wc `echo *`; fi
! df | tail
wc $(echo *)
!
If '<<!' doesn't work, you can switch to '<<SOMETHING_UNIQUE'.

Tuesday, September 15, 2009

ZFS in FreeBSD

Author: pjd                                                                             
Date: Tue Sep 15 11:34:53 2009                                                          
New Revision: 197218                                                                    
URL: http://svn.freebsd.org/changeset/base/197218                                       
                                                                                        
Log:                                                                                    
  We believe ZFS is ready for production use. Remove a warning about it being           
  experimental. :)                                                                      
                                                                                        
Modified:                                                                               
  head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zfs_ioctl.c                       
                                                                                        
Modified: head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zfs_ioctl.c               
==============================================================================          
--- head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zfs_ioctl.c     Tue Sep 15      
+11:23:59 2009  (r197217)                                                               
+++ head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zfs_ioctl.c     Tue Sep 15      
+11:34:53 2009  (r197218)                                                               
@@ -3072,8 +3072,6 @@ zfs_modevent(module_t mod, int type, voi                          
        switch (type) {                                                                 
        case MOD_LOAD:                                                                  
                zfs_root_token = root_mount_hold("ZFS");                                
-               printf("WARNING: ZFS is considered to be an experimental "              
-                   "feature in FreeBSD.\n");                                           
                                                                                        
                mutex_init(&zfs_share_lock, NULL, MUTEX_DEFAULT, NULL);                 

Saturday, September 12, 2009

Tetris to the rescue!

I never play games when I recover a computer but apparently some people do:
From apb@cequrux.com  Mon Sep  7 20:50:54 2009
Return-Path: 
Received: from mail.netbsd.org (mail.netbsd.org [204.152.190.11])
 by www.NetBSD.org (Postfix) with ESMTP id E6F8B63BCFB
 for ; Mon,  7 Sep 2009 20:50:54 +0000 (UTC)
Message-Id: <20090907205043.3DDA0100AA4C@apb-laptoy.apb.alt.za>
Date: Mon,  7 Sep 2009 20:50:43 +0000 (UTC)
From: apb@cequrux.com
Reply-To: apb@cequrux.com
To: gnats-bugs@gnats.NetBSD.org
Subject: /rescue/tetris should not use high scores file
X-Send-Pr-Version: 3.95


>Number:         42009
>Category:       bin
>Synopsis:       /rescue/tetris should not use high scores file
>Confidential:   no
>Severity:       non-critical
>Priority:       medium
>Responsible:    dholland
>State:          closed
>Class:          change-request
>Submitter-Id:   net
>Arrival-Date:   Mon Sep 07 20:55:00 +0000 2009
>Closed-Date:    Tue Sep 08 13:49:23 +0000 2009
>Last-Modified:  Tue Sep 08 13:49:23 +0000 2009
>Originator:     Alan Barrett
>Release:        NetBSD 5.99.16
>Organization:
Not much
>Environment:
System: NetBSD 
Architecture: i386
Machine: i386
>Description:
 /rescue/tetris tries to use /var/games/tetris.scores.  If the system
        is in a bad state, possibly with corrupted file systems, it
        would be a bad idea to write anywhere without a deliberate
        decision by the sysadmin.  Simply running a game does not count
        as as deliberate decision to write to the file system.
>How-To-Repeat:
 /rescue/tetris
 press 'q' to quit.
 see this message:
 tetris: Cannot open /var/games/tetris.scores for read/write:
  Permission denied
>Fix:
 Disable the high scores feature in the rescue version of tetris.


>Release-Note:


>Audit-Trail:


Responsible-Changed-From-To: bin-bug-people->dholland
Responsible-Changed-By: dholland@NetBSD.org
Responsible-Changed-When: Mon, 07 Sep 2009 23:33:37 +0000
Responsible-Changed-Why:
take.




From: "David A. Holland" 
To: gnats-bugs@gnats.NetBSD.org
Cc: 
Subject: PR/42009 CVS commit: src/games/tetris
Date: Tue, 8 Sep 2009 13:38:01 +0000


 Module Name: src
 Committed By: dholland
 Date:  Tue Sep  8 13:38:01 UTC 2009

 
 Modified Files:
  src/games/tetris: scores.c

 
 Log Message:
 Disable writing scores when built for /rescue. PR 42009

 

 
 To generate a diff of this commit:
 cvs rdiff -u -r1.17 -r1.18 src/games/tetris/scores.c

 
 Please note that diffs are not public domain; they are subject to the
 copyright notices on the relevant files.

 
State-Changed-From-To: open->closed
State-Changed-By: dholland@NetBSD.org
State-Changed-When: Tue, 08 Sep 2009 13:49:23 +0000
State-Changed-Why:
fixed, thanks




>Unformatted:

 

Sunday, March 15, 2009

United States Patent 6711562

I came across this patent when searching for a cache-friendly associative containers. http://www.freepatentsonline.com/6711562.html UPDATE: I found what I was searching for: http://idlebox.net/2007/stx-btree/stx-btree-0.8.3/doxygen-html/speedtest.html