Messages in this thread | | | Date | Sat, 2 Nov 2002 21:21:40 -0500 (EST) | From | Alexander Viro <> | Subject | Re: Filesystem Capabilities in 2.6? |
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On Sat, 2 Nov 2002, Linus Torvalds wrote:
> The reason I like directory entries as opposed to inodes is that if you > work this way, you can actually give different people _different_ > capabilities for the same program. You don't need to have two different > installs, you can have one install and two different links to it.
<shrug> that can be done without doing anything to filesystem. Namely, turn current "nosuid" of vfsmount into a mask of capabilities. Then use bindings instead of links. *Note* - binary _is_ marked suid, mask tells which capabilities _not_ to gain. It's OK - attempt to link(2) to the thing using binding will see that oldname and newname are within different vfsmounts, so instead of link to suid-root binary you get -EXDEV.
And that works on any fs, can be made per-user and can be _seen_ by admin - bindings are visible in /proc/mounts (yes, I remember that we need to fix the crap with pathnames).
I can do that thing in a weekend - it's trivial to implement. No need to bugger filesystems for that.
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