Messages in this thread | | | Subject | Re: [PATCH] Undo some of the pseudo-security madness | From | Arjan van de Ven <> | Date | Sun, 21 Jan 2007 03:16:04 +0100 |
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On Sat, 2007-01-20 at 17:37 +0300, Samium Gromoff wrote: > This patch removes the dropping of ADDR_NO_RANDOMIZE upon execution of setuid > binaries. > > Why? The answer consists of two parts: > > Firstly, there are valid applications which need an unadulterated memory map. > Some of those which do their memory management, like lisp systems (like SBCL). > They try to achieve this by setting ADDR_NO_RANDOMIZE and reexecuting themselves.
this is a ... funny way of achieving this
if an application for some reason wants some fixed address for a piece of memory there are other ways to do that.... (but to some degree all apps that can't take randomization broken; for example a glibc upgrade on a system will also move the address space around by virtue of being bigger or smaller etc etc)
> [1]. See the excellent, 'Hackers Hut' by Andries Brouwer, which describes > how AS randomisation can be got around by the means of linux-gate.so.1
got a URL to this? If this is exploiting the fact that the vdso is at a fixed spot... it's no longer the case since quite a while.
-- if you want to mail me at work (you don't), use arjan (at) linux.intel.com Test the interaction between Linux and your BIOS via http://www.linuxfirmwarekit.org
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