Messages in this thread |  | | Date | Mon, 15 Oct 2001 08:11:20 -0400 (EDT) | From | Alexander Viro <> | Subject | Re: [RFC] "Text file busy" when overwriting libraries |
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On Mon, 15 Oct 2001, Alan Cox wrote:
> > Anyone can write it, but what the hell will he do without write access to > > any place that wouldn't be mounted noexec? Environment can be restricted > > even if you give them shell... > > He will type "perl" and interactively issue any damn syscall he likes > subject to the normal permissions rules. Noexec is only useful for a user > given virtually nothing.
... and will hit "permission denied" on attempt to exec /usr/bin/perl. Blanket noexec on /usr instance mounted in his chroot with selective turning the thing off on some binaries. And yes, I realize that one can always hunt for buffer overruns in sh(1)...
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