Applications and Theory of Petri Nets 2005: 26th by Giuliana Franceschinis (auth.), Gianfranco Ciardo, Philippe

By Giuliana Franceschinis (auth.), Gianfranco Ciardo, Philippe Darondeau (eds.)

This quantity comprises the complaints of the twenty sixth foreign convention on program and conception of Petri Nets and different versions of Concurrency (ICATPN 2005). The Petri web meetings serve to debate every year development within the ?eld of Petri nets and similar types of concurrency, and to foster new - vancesintheapplicationandtheoryofPetrinets.Theconferencestypicallyhave 100–150 individuals, one 3rd from and the others from universities and examine associations, and so they regularly ensue within the final week of June. SuccessiveeditionsoftheconferencearecoordinatedbytheSteeringCommittee, whose participants are indexed at the subsequent web page, which additionally supervises numerous different activities—see the Petri Nets international on the The 2005 convention used to be equipped in Miami via the varsity of machine technology at Florida foreign collage (USA). we want to specific our deep due to the Organizing Committee, chaired through Xudong He, for the time and e?ort invested to the bene?t of the neighborhood in making the development winning. a number of tutorials and workshops have been equipped in the conf- ence, protecting introductory and complicated elements on the topic of Petri nets. targeted details are available on the convention We got altogether seventy one submissions from authors in 22 international locations. submissions weren't within the scope of the convention. this system Comm- tee chosen 23 contributions from the rest sixty nine submissions, classi?ed into 3 different types: program papers (6 permitted, 25 submitted), thought papers (14 authorized, forty submitted), and power shows (3 authorized, four submitted).

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Extra resources for Applications and Theory of Petri Nets 2005: 26th International Conference, ICATPN 2005, Miami, USA, June 20-25, 2005. Proceedings

Example text

Let SP F S stand for the security policy on a given file system. Now consider the following scenario. First, u1 executes p1 . This has the effect of giving u1 ’s rights to p1 : [1] SP E = Inherit(SP F S , p1 , u1 ) Now, p1 “runs as” u2 . This has the effect of first revoking p1 ’s original rights and then giving u2 ’s rights to p1 : [2] SP RA = Inherit(Revoke(SP E , p1 ), p1 , u2 ) Assuming u1 controls p1 ’s behavior, then for the lifetime of p1 , u1 gets whatever rights p1 acquires: [3] SP C = Inherit(SP RA , u1 , p1 ) From the compositional property of Inherits (Section 3), [2] and [3] leads to [4] below, and we are left in a state where u1 has inherited u2 ’s rights: [4] SP C ⊇ Inherit(SP F S , u1 , u2 ) Let’s see how the use of “run as” can lead to a security vulnerability.

However, continuous PN have a characteristic that these general piecewise systems do not have: the change of one linear system to another one is triggered by the continuous state (the marking). This makes the observability of continuous PN a more simple issue [47]: if the system passes through an observable linear system, its marking at that moment can be observed. And since it is deterministic, it is possible to simulate it backwards and deduce the initial marking. Notice also that observability of a synchronization will not be possible in general unless all its input places are measured (it might be possible to measure one place only if it were timed implicit).

Exe, x u2 , f, read The first entry is the troublesome one: it gives process p1 the ability to run as any user. exe, which creates a process p1 with the given rights, and since p1 can run as u2 and u2 has access to f , then u1 gains access to f even though that right is absent from the security policy. com request is made, Google Desktop Search (GDS) performs a search on the local file system with the same request. The local search results include 30-40 character snippets of local files that contain the query’s terms.

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