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Matthias Hopf 1d930fc75b drm/i915: fix ioremap of a user address for non-root (CVE-2008-3831) 
Olaf Kirch noticed that the i915_set_status_page() function of the i915
kernel driver calls ioremap with an address offset that is supplied by
userspace via ioctl. The function zeroes the mapped memory via memset
and tells the hardware about the address. Turns out that access to that
ioctl is not restricted to root so users could probably exploit that to
do nasty things. We haven't tried to write actual exploit code though.

It only affects the Intel G33 series and newer.
2008-10-25 12:15:50 -04:00
bsd-core [FreeBSD] We should use dev2unit() rather than minor() 2008-10-23 15:46:32 -04:00
libdrm intel: Also total child_size of the target_bos. Partial fix #17964. 2008-10-24 16:41:54 +08:00
linux-core drm: fix sysfs error path. 2008-09-02 10:08:26 +10:00
scripts drm: add create gpu tree script 2008-10-07 04:07:40 +10:00
shared-core drm/i915: fix ioremap of a user address for non-root (CVE-2008-3831) 2008-10-25 12:15:50 -04:00
tests drm: Add tests for GEM_FLINK ioctl. 2008-09-10 14:07:18 -07:00
.gitignore drm: Add tests for GEM_FLINK ioctl. 2008-09-10 14:07:18 -07:00
autogen.sh update autogen from xserver tree 2005-09-12 06:21:24 +00:00
configure.ac intel: Protect bufmgr objects with a pthread mutex. 2008-10-09 12:57:09 -07:00
libdrm.pc.in Better pkgconfig-fu: -ldrm in Libs: 2005-10-13 21:03:31 +00:00
Makefile.am Add some trivial regression tests, one of which fails. 2007-07-19 04:59:59 -07:00
README More detailed instructions, tips. 2007-04-25 14:52:29 -06:00

README 

DRM README file


There are two main parts to this package: the DRM client library/interface
(libdrm.so) and kernel/hardware-specific device modules (such as i915.ko).



Compiling
---------

By default, libdrm and the DRM header files will install into /usr/local/.
If you want to install this DRM to replace your system copy, say:

	./configure --prefix=/usr --exec-prefix=/

Then,
	make install


To build the device-specific kernel modules:

	cd linux-core/
	make
	cp *.ko /lib/modules/VERSION/kernel/drivers/char/drm/
	   (where VERSION is your kernel version: uname -f)

Or,
	cd bsd-core/
	make
	copy the kernel modules to the appropriate place



Tips & Trouble-shooting
-----------------------

1. You'll need kernel sources.  If using Fedora Core 5, for example, you may
   need to install RPMs such as:

	kernel-smp-devel-2.6.15-1.2054_FC5.i686.rpm
	kernel-devel-2.6.15-1.2054_FC5.i686.rpm
	etc.


2. You may need to make a symlink from /lib/modules/VERSION/build to your
   kernel sources in /usr/src/kernels/VERSION (where version is `uname -r`):

	cd /lib/modules/VERSION
	ln -s /usr/src/kernels/VERSION build


3. If you've build the kernel modules but they won't load because of an
   error like this:

	$ /sbin/modprobe drm
	FATAL: Error inserting drm (/lib/modules/2.6.15-1.2054_FC5smp/kernel/drivers/char/drm/drm.ko): Invalid module format

   And 'dmesg|tail' says:

	drm: disagrees about version of symbol struct_module 

   Try recompiling your drm modules without the Module.symvers file.
   That is rm the /usr/src/kernels/2.6.15-1.2054_FC5-smp-i686/Module.symvers
   file (or rename it).  Then do a 'make clean' before rebuilding your drm
   modules.