linux-hardened/drivers/lguest
Rusty Russell 98fb4e5e6b lguest: fix guest kernel stack overflow when TF bit set.
The symptoms are that running gdb on a binary causes the guest to
overflow the kernels stack (after some period of time), resulting in
it finally being killed with a "Bad address" message.

Reported-by: Sakari Ailus <sakari.ailus@iki.fi>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
2013-09-06 08:09:27 +09:30
..
x86 x86, flags: Rename X86_EFLAGS_BIT1 to X86_EFLAGS_FIXED 2013-06-25 16:25:32 -07:00
core.c lguest: map Switcher below fixmap. 2013-04-22 15:45:03 +09:30
hypercalls.c lguest: update commentry 2009-07-30 16:03:46 +09:30
interrupts_and_traps.c lguest: fix guest kernel stack overflow when TF bit set. 2013-09-06 08:09:27 +09:30
Kconfig lguest: fix paths in comments 2013-03-07 09:56:46 +11:00
lg.h lguest: cache last cpu we ran on. 2013-04-22 15:45:03 +09:30
lguest_device.c virtio: make config_ops const 2013-02-11 15:32:17 +10:30
lguest_user.c lguest: improve code readability in lg_cpu_start. 2013-04-30 09:24:30 +09:30
Makefile lguest: move the lguest tool to the tools directory 2012-01-12 15:44:47 +10:30
page_tables.c lguest: fix BUG_ON() in invalid guest page table. 2013-09-06 08:09:26 +09:30
README lguest: documentation I: Preparation 2007-07-26 11:35:16 -07:00
segments.c lguest: switch segment-voodoo-numbers to readable symbols 2012-01-12 15:44:47 +10:30

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.