Messages in this thread | | | Date | Thu, 26 Aug 2004 18:20:29 +0100 | From | Jamie Lokier <> | Subject | Re: silent semantic changes with reiser4 |
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Linus Torvalds wrote: > And it would be perfectly ok for O_DIRECTORY to open such a file, as long > as it opens the directory branch, not the special device.
What about:
cd /dev/into_directory_branch/ run_setuid_program
-> calls pwd pwd opens("."), (".."), ("../..") etc.
-> the setuid program thus ends up opening a device or fifo, when it does pwd's path walk. Yes it could use the getcwd syscall, but some programs do their own path walk.
> I advocated (long ago) something like this for /dev handling, just because > I think it would make sense to have > > /dev/hda <- special file > /dev/hda/part1 <- partition 1 (aka /dev/hda1) > > which just seems like a very obvious and intuitive interface to me. Of > course, we have so much legacy in /dev that there's no real point to doing > this, but it's still an appealing approach, I think.
It also fits the container idea very well:
/dev/hda/part1/ <- the filesystem inside partition 1
That's not a contrivance, it's what I'd expect to happen if /dev/hda is an ordinary file containing a disk image:
image.bin <- hard disk image (a regular file) image.bin/part1 <- partition 1 image.bin/part1/ <- the filesystem inside partition 1
That's assuming there's a format handler which recognises that image.
-- Jamie - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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