On Mon, Nov 24, 2003 at 07:58:17PM +0100, Michal Zalewski wrote: > But yes, hardlinks introduce a whole array of security problems and other > brain-damage scenarios (a trivia: what happens if you create a hardlink to > /usr/bin/passwd in /tmp? 1: you cannot remove it; 2: if you name it > 'r00tshell', the administrator would have a a heart attack upon spotting a > root-owned setuid binary in /tmp). This is hardly new - you can Google for > some BUGTRAQ discussions and such back in the '99 or so - but should be > brought up once in a while. If the administrator is worth her salary, you will be unable to create that hardlink because /usr/bin/passwd and /tmp will be on different partitions. This entire issue is more of a configuration issue than a Linux issue. You should never configure a multiuser system such that users can write to partitions which contain suid binaries.
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