On Sun, Aug 19, 2007 at 02:31:49PM +0200, Brice Goglin wrote: > On Fri, Oct 28, 2005 at 07:47:14PM +0200, Lennert Buytenhek wrote: > > On arm platforms where physical RAM doesn't start at physical address > > zero, opening /dev/mem and reading from it causes a kernel oops. This > > is arguably a kernel bug, but it's still not a very good idea to just > > start randomly poking around in /dev/mem in search of entropy, which is > > what xdm does if it can't get entropy elsewhere. > > > > (When the kernel is fixed, blindly reading from /dev/mem will simply > > just fail with EFAULT instead of oopsing. If that will cause xdm to > > fail, it should really just fail right away if /dev/random doesn't work.) > > xdm seems to try /dev/urandom first nowadays (before /dev/random and then > /dev/mem). I don't whether arm systems have a /dev/urandom, but it seems > more likely than having a /dev/random. > > I don't know which version of xdm you were running when you reported this > problem (Xorg 6.8.2 was the latest release on 2005/10/28). But it was at > the same time that the urandom support has been added upstream (in Xorg > 6.9.99.902 on 2005/10/29). > > So please test with a more recent xdm and report back whether it helps.
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