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Apur-ee.133 fa.unix-wizards utzoo!decvax!pur-ee!bruner Thu Sep 10 10:44:00 1981 setuid cleared on write I tried to send this out before, but it was smashed somehow:

I would propose that the setuid bit be cleared if the file is written by someone other than its owner, and similarly that the setgid bit be cleared if the group-id of the writer doesn't match the group id of the file. This way, a user could write upon his own files and not have to remember to "chmod" them back after each write. Also, members of a group (who, in general, cannot "chmod" the file) can change its contents without clearing the setgid bit. Users other than the owner (for setuid) or users outside of the group (for setgid) could not take advantage of a file accidentally left writable.

--John Bruner (ucbvax!pur-ee!bruner)

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