PROSOXH!!! ASFALEIA. (was: ioperm How to)

[Alexios Chouchoulas]

> Exw mia aporia, 8elw na dwsw diakaiwma se kapoion xrhsth gia na mporei
> na xrhshmopoiei thn ioperm (sto man leei bebaia oti mono o root exei
> privileges sthn IOPERM), an kaneis xerei pws mporei na ginei auto
> as grapsei sth lista!

  Den mporei kai den prepei na ginei. Einai *KAKO PRAGMA* na epitrepeis
stous koinous thnitous na paizoun me tyxaia I/O ports sou. Ena aplo binary
patch apo kapoion kakoboulo kai exei plhrh prosbash sto hardware sou --
prosbash pou o kernel sterei akoma kai ston superuser.

  Des oles tis trypes tou SVGAlib, px. H lysh einai ws ekshs: to programma
trexei setuid root [1]. Sthn arxh tou kai *PRIN KANEIS OTIDHPOTE ALLO* [2]
trexeis thn ioperm(2) kai o,ti allo prepei na treksei se privileged mode.
*AMESWS META* [3] ginesai koinos thnitos me thn setuid(2).

  An to kaneis swsta, einai sourealistika dyskolo na paei kati straba ston
elaxisto kwdika pou tha ekteleitai ws root. Alla an to kaneis lathos
anoigeis mia trypa naaaaaaa (me to sympatheio). Mhn kaneis to lathos na
trekseis tipota allo ektos apo thn ioperm kai ta teleiws aparaithta oso
to process sou exei root privileges.

  An exeis to source code ths SVGAlib, exei akribws afth th diadikasia sthn
arxh, opou zhtaei I/O ports apo to systhma kai meta apo root ginetai koinos
thnitos -- gi'afto, an exeis proseksei, ta SVGAlib programmata apaitoun na
treksoun ws setuid root [4].

- ---
[1] man 1 chmod 2 setuid
[2] To ennow!!! An den prosekseis "xarizeis" root access se olous tous
    xrhstes sou. Skepsou to. Mprrrr.
[3] AMESWS META.
[4] Kai gi'afto prepei na ta koitas gia na sigourefteis oti den kanoun
    tipota allo kako oso exoun akoma ta permissions. Mporeis poly efkola na
    ftiakseis trojans etsi. Yperbolika efkola, dystyxws.

Alexios Chouchoulas          '88    ,88'   ,88'     alexios at vennea.demon.co.uk
The Unpronouncable One      ,o88oooo88ooooo88oo,              axc at dcs.ed.ac.uk

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