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SubjectRe: [PATCH v3] vfs: new O_NODE open flag
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On Sat, 05 Dec 2009, Andy Lutomirski wrote:
> I don't know what that means. Do you mean that if:
>
> root creates /dev/foo with 0666 perms
> eviluser opens /dev/foo with O_NODE

More precisely, O_NODE | O_NOACCESS
> root chmods /dev/foo to 0000
> root unlinks /dev/foo
>
> then eviluser can't open /proc/self/fd/whatever for O_RDRW

Yes.

Maybe alan was worried about the O_NODE | O_RDWR, etc. case? That
simply doesn't make any sense for special files.
Current patch only allows O_NOACCESS for any file type, but other
access modes may make sense for regular files, directories, and maybe
even symlinks.

Thanks,
Miklos


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