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SubjectRe: Filesystem Capabilities in 2.6?


On Sat, 2 Nov 2002, Linus Torvalds wrote:

> However, I think there is a problem with Al's original approach: the bind
> can _not_ be just a mask that takes away capabilities from a suid
> application, since that would imply that the app has to be marked suid in
> the first place (and accessing it _without_ going through the bind will
> give it elevated privileges, which is what we're trying to avoid).

No, that's OK -

mount --bind /usr/bin/foo.real /usr/bin/foo.real
mount -o remount,nosuid /usr/bin/foo.real

or equivalent couple of mount(2) calls will do the trick nicely (and that,
BTW, we have right now - you can selectively disable/enable suid on files
and entire subtrees).

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