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Re: /proc filesystem allows bypassing directory permissions on Linux
From: psz () maths usyd edu au
Date: Tue, 27 Oct 2009 08:58:39 +1100

Dear Casper and Dan,

If you can control<pid>, then clearly you have access the file anyway
simply by controlling it using a debugger.

Sorry, but no. The "attacker" has the file opened O_RDONLY, and cannot
"upgrade" that to O_RDWR.

Cheers, Paul

Paul Szabo   psz () maths usyd edu au   http://www.maths.usyd.edu.au/u/psz/
School of Mathematics and Statistics   University of Sydney    Australia

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