Messages in this thread | | | Date | Tue, 22 Jun 1999 13:42:28 +0100 (GMT) | From | Chris Evans <> | Subject | Re: immutable flag on ext2fs |
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On Tue, 22 Jun 1999, Alan Cox wrote:
> Securelevel is supposed to be one way in all respects. So it disables access > to raw block devices, to mmap on /dev/*mem and all other known paths root could > use to change it indirectly back (eg ioperm/iopl)
The interesting statement (and the challenge) is the quote "all other known paths". If any cunning people out there can think of other, not-covered ways that root can subvert the kernel, please get in touch with me, or Alan, or the list etc.
This work isn't relevant to just securelevel - it is vital for capabilities too.
Chris
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