15.10.2008-15:31:23 :: Something smarter than us is going to emerge


node:	15.10.2008-15:31:23
template:	4
parent:	LINUX pro uplne zacatecniky
owner:	G
viewed by:
created:	15.10.2008 - 15:31:27

cwbe coordinatez:
101
63540
63542
2109677
63692
4237140

ABSOLUT
KYBERIA

permissions
you:	r,
system:	public
net:	yes

situaci
15:20 vytvorim subor a potom mu pomocou touch zmenim timestamp na 15:00
da sa nejako zistit kedy bol skutocne vytvoreny/modifikovany?

00000101000635400006354202109677000636920423714004237627

staci mi toto nakoniec

[dunmer@joybox ~]$ touch omg
[dunmer@joybox ~]$ ls -l | grep omg
-rw-r--r-- 1 dunmer users 8 2008-10-15 19:09 omg
[dunmer@joybox ~]$ touch -t 10151700 omg
[dunmer@joybox ~]$ ls -l | grep omg
-rw-r--r-- 1 dunmer users 8 2008-10-15 17:00 omg
[dunmer@joybox ~]$ stat omg
File: `omg'
Size: 8 Blocks: 8 IO Block: 4096 regular file
Device: 804h/2052d Inode: 50913 Links: 1
Access: (0644/-rw-r--r--) Uid: ( 1000/ dunmer) Gid: ( 100/ users)
Access: 2008-10-15 17:00:00.000000000 +0200
Modify: 2008-10-15 17:00:00.000000000 +0200
Change: 2008-10-15 19:10:24.000000000 +0200
[dunmer@joybox ~]$

potreboval som len zistit ci niekto menil ten klasicky modify time co vypisuje ls -l
a to vidno v tom change time
[ci snad nie? .D]

0000010100063540000635420210967700063692042371400423762704238181

ctime sa samozrejme da zmenit tiez.

000001010006354000063542021096770006369204237140042376270423818104238190

ako?

00000101000635400006354202109677000636920423714004237627042381810423819004238192

napriklad zmenou systemoveho casu
touch
zmena nazad

0000010100063540000635420210967700063692042371400423762704238181042381900423819204238194

ten kto by to mohol menit v tomto pripade nema roota..

000001010006354000063542021096770006369204237140042376270423818104238190042381920423819404238299

aha, potom by to mohlo byt ok.
aj ked osobne by som sa na to asi velmi nespoliehal, ctime je ovplyvneny napriklad obycajnym chmodom; dotycny sa moze vyhovarat, ze mal zle nastavene prava.

00000101000635400006354202109677000636920423714004237627042381810423819004238192042381940423829904238324

ide o tom ze dotycny po urcitom cas nema nic so suborom robit, ani menit prava..
takze by to malo byt safe

00000101000635400006354202109677000636920423714004237246

http://www.brandonhutchinson.com/ctime_atime_mtime.html

00000101000635400006354202109677000636920423714004237200

touchom sa tusim ta menit len mtime, ctime ostava a zmenit sa z userspace-u neda.

0000010100063540000635420210967700063692042371400423720004237246

http://www.brandonhutchinson.com/ctime_atime_mtime.html

00000101000635400006354202109677000636920423714004237191

zda sa, ze v sucasnosti nie, aj ked sa podpora pre crtime nedavno pridala do ext4.