Bug#336220: xdm: bogus /dev/mem access lead to trouble on arm platforms
On Mon, Sep 17, 2007 at 08:55:49AM +0200, Brice Goglin 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. Ping? I'm not sure what to reply to this. The problem is not that xdm doesn't check /dev/urandom first, the problem is that it reads from /dev/mem _at all_. It is possible that checking /dev/urandom first masks the problem in most configurations, but it doesn't solve it (if you don't have /dev/random and /dev/urandom in your filesystem for whatever reason, you still oops.) -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of unsubscribe. Trouble? Contact [EMAIL PROTECTED]
Bug#367188: xorg: Please add big-endian arm (armeb) support
Package: xorg Version: 7.0.17 Severity: wishlist Tags: patch The attached patch adds support for the big-endian arm (armeb) architecture to xorg 7.0.17 by copying vars.arm to vars.armeb. -- System Information: Debian Release: 3.1 Architecture: armeb (armv5teb) Kernel: Linux 2.6.17-rc2 Locale: LANG=C, LC_CTYPE=C (charmap=ANSI_X3.4-1968) --- xorg-7.0.17/debian/scripts/vars.armeb.orig 2006-05-07 11:31:26.0 +0200 +++ xorg-7.0.17/debian/scripts/vars.armeb 2006-05-07 11:30:59.0 +0200 @@ -0,0 +1,10 @@ + +# This file is NOT a shell script. +# +# This file gets included by both debian/rules (make) AND the scripts in +# debian/scripts (Bourne shell). +XSERVER_XORG_VIDEO_DEPENDS=xserver-xorg-video-apm, xserver-xorg-video-ark, xserver-xorg-video-ati, xserver-xorg-video-chips, xserver-xorg-video-cirrus, xserver-xorg-video-cyrix, xserver-xorg-video-dummy, xserver-xorg-video-fbdev, xserver-xorg-video-glint, xserver-xorg-video-i128, xserver-xorg-video-i740, xserver-xorg-video-i810, xserver-xorg-video-imstt, xserver-xorg-video-mga, xserver-xorg-video-neomagic, xserver-xorg-video-newport, xserver-xorg-video-nsc, xserver-xorg-video-nv, xserver-xorg-video-rendition, xserver-xorg-video-s3, xserver-xorg-video-s3virge, xserver-xorg-video-savage, xserver-xorg-video-siliconmotion, xserver-xorg-video-sis, xserver-xorg-video-sisusb, xserver-xorg-video-tdfx, xserver-xorg-video-tga, xserver-xorg-video-trident, xserver-xorg-video-tseng, xserver-xorg-video-vesa, xserver-xorg-video-vga, xserver-xorg-video-via, xserver-xorg-video-voodoo, xserver-xorg-video-vmware, xserver-xorg-video-v4l + +# xserver-xorg-video-glide, + +XSERVER_XORG_INPUT_DEPENDS=xserver-xorg-input-evdev, xserver-xorg-input-kbd, xserver-xorg-input-mouse, xserver-xorg-input-synaptics, xserver-xorg-input-wacom
Bug#336220: xdm: bogus /dev/mem access lead to trouble on arm platforms
Package: xdm Severity: important 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.) -- System Information: Debian Release: testing/unstable APT prefers stable APT policy: (500, 'stable') Architecture: armeb (armv4b) Shell: /bin/sh linked to /bin/bash Kernel: Linux 2.6.13 Locale: LANG=C, LC_CTYPE=C (charmap=ANSI_X3.4-1968) -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of unsubscribe. Trouble? Contact [EMAIL PROTECTED]
