linux-kernel - [ANNOUNCE] MDB Merkey Debugger for Linux 2.6.34-06-17-2010 (CR3 Fixes)

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Message-ID: <AANLkTilR54xU8wpixR4LQyhKG7KV_wCLJNxT1e_3aAqr@mail.gmail.com>
Date:	Thu, 17 Jun 2010 14:55:36 -0600
From:	Jeffrey Merkey <jeffmerkey@...il.com>
To:	linux-kernel@...r.kernel.org
Subject: [ANNOUNCE] MDB Merkey Debugger for Linux 2.6.34-06-17-2010 (CR3 
	Fixes)

http://merkeydebugger.googlecode.com/files/mdb-2.6.34-06-17-2010.patch

FIXES

Add

mov cr3,%eax
mov %eax,cr3

to main callback from notify_die() function.  Linux in various
functions will alter page tables in batches without issuing a TLB
flush command.  Daemonize() is one such function where the .mm is
deleted and no TLB flush in executed.  Such cases
require that the debugger always reload CR3 on breakpoint exceptions
to avoid double and triple faulting, and in this case
will hand the system in the page fault handler if CR3 is not reloaded
every exception to make certain the processor has a
valid view of the TLB and page tables.

Jeff
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