File modification protection

[Christos Ricudis]

Hello Achilleas!

  On 03 May 99, Achilleas Kotsis wrote to Costas Barakitis with subject "Re:
File modification protection":

 >>> Den exw akousei na ginetai ayto pou zhtas, alla isws mporeis
 >>> na xrhsimopoihseis to "immutable" attribute tou ext2fs. An 
 >>> dwseis `chattr +i arxeio' tote to arxeio den mporei na to 
 >>> peirajei kaneis, oute o root, mexri na afairethei to 
 >>> immutable. Ta attributes mporei na ta peirajei mono o root.
 >> Ayto den to hksera. Loykoymi einai gia thn periptwsh moy.

 AK> An katalaba kala apo allo email sou, 8eleis na dwseis se kapoion
 AK> root se ena mhxanhma,alla na mhn mporei na peira3ei kapoia arxeia.
 AK> Den katalaba pou blepeis to loukoumi omws sthn sugkekrimenh
 AK> periptwsh :)

H logikh einai oti se ka8e systhma yparxei ena securelevel to opoio orizetai
sto boot kai meta menei sta8ero. An to securelevel einai p.x. 1, kaneis (oyte o
root) den mporei na ektelesei kapoies leitoyrgies (parabiash twn immutable
flags, anagnwsh twn raw disk files, ktl ktl). Gia na allakseis ena immutable
flag, prepei na kaneis reboot me securelevel 0. 

Etsi toylaxiston doyleyei sto BSD kai etsi eixe ylopoih8ei kai sto linux se
kapoio shmeio ths zwhs toy - den 8ymamai akribws poy alla eixa dei ton analogo
kwdika. 

Sto 2.2, ayto exei antikatasta8ei apo ena systhma me priviledges poy mporei na
doylepsei me paromoio tropo, alla den kserw kata poso akoma einai etoimo. 

--
Christos Ricudis
I am a target. Please bomb me at N40 33.765' E22 55.130'
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