linux/drivers/lguest
Rusty Russell 6afbdd059c lguest: fix spurious BUG_ON() on invalid guest stack.
Impact: fix crash on misbehaving guest

gpte_addr() contains a BUG_ON(), insisting that the present flag is
set.  We need to return before we call it if that isn't the case.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Cc: stable@kernel.org
2009-03-30 21:55:23 +10:30
..
x86 lguest: use cpu capability accessors 2008-07-29 09:58:34 +10:00
core.c lguest: typos fix 2009-01-30 11:34:10 +10:30
hypercalls.c lguest: comment documentation update. 2008-03-28 11:05:54 +11:00
interrupts_and_traps.c x86: fix lguest used_vectors breakage, -v2 2008-12-23 22:37:28 +01:00
Kconfig x86: remove the Voyager 32-bit subarch 2009-02-23 00:54:01 +01:00
lg.h lguest: move the initial guest page table creation code to the host 2008-12-30 09:26:11 +10:30
lguest_device.c lguest: fix for CONFIG_SPARSE_IRQ=y 2009-03-09 10:06:29 +10:30
lguest_user.c lguest: Fix a memory leak with the lg object during launcher close 2009-01-30 11:34:11 +10:30
Makefile lguest: Add puppies which where previously missing. 2008-03-28 11:05:52 +11:00
page_tables.c lguest: fix spurious BUG_ON() on invalid guest stack. 2009-03-30 21:55:23 +10:30
README lguest: documentation I: Preparation 2007-07-26 11:35:16 -07:00
segments.c lguest: get rid of lg variable assignments 2008-01-30 22:50:18 +11:00

Welcome, friend reader, to lguest.

Lguest is an adventure, with you, the reader, as Hero.  I can't think of many
5000-line projects which offer both such capability and glimpses of future
potential; it is an exciting time to be delving into the source!

But be warned; this is an arduous journey of several hours or more!  And as we
know, all true Heroes are driven by a Noble Goal.  Thus I offer a Beer (or
equivalent) to anyone I meet who has completed this documentation.

So get comfortable and keep your wits about you (both quick and humorous).
Along your way to the Noble Goal, you will also gain masterly insight into
lguest, and hypervisors and x86 virtualization in general.

Our Quest is in seven parts: (best read with C highlighting turned on)

I) Preparation
	- In which our potential hero is flown quickly over the landscape for a
	  taste of its scope.  Suitable for the armchair coders and other such
	  persons of faint constitution.

II) Guest
	- Where we encounter the first tantalising wisps of code, and come to
	  understand the details of the life of a Guest kernel.

III) Drivers
	- Whereby the Guest finds its voice and become useful, and our
	  understanding of the Guest is completed.

IV) Launcher
	- Where we trace back to the creation of the Guest, and thus begin our
	  understanding of the Host.

V) Host
	- Where we master the Host code, through a long and tortuous journey.
	  Indeed, it is here that our hero is tested in the Bit of Despair.

VI) Switcher
	- Where our understanding of the intertwined nature of Guests and Hosts
	  is completed.

VII) Mastery
	- Where our fully fledged hero grapples with the Great Question:
	  "What next?"

make Preparation!
Rusty Russell.