Messages in this thread | | | Subject | Re: [PATCH v3] vfs: new O_NODE open flag | From | Miklos Szeredi <> | Date | Sat, 05 Dec 2009 20:40:33 +0100 |
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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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