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Aucbvax.3071 fa.unix-wizards utzoo!decvax!ucbvax!unix-wizards Thu Sep 10 23:23:36 1981 writable setuid files >From CSVAX.dmr@Berkeley Thu Sep 10 23:17:40 1981 Throwing away setuid (or setgid) bits on a written file is indeed a considerable pain. It is also (in UCB vmunix) done strangely, in the iwrite routine. Has it occurred to anyone else that a more natural way to achieve equivalent safety is to prevent write access to a setuid file except to the owner, and likewise for setgid? That is, if the file is setuid, ignore all but the owner permission bits. Dennis Ritchie

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