Windows 8's locked bootloaders: much ado about nothing

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Mike Gonta

Joined: 26 Dec 2010
Posts: 243

Mike Gonta 10 Nov 2012, 20:48

http://alturl.com/aag9i

x86 Windows 8 systems must also allow secure boot to be
turned off completely, so that no certificate verification
is performed at all.
UEFI allows the ability to drop back to mimicking BIOS,
to allow UEFI systems to start pre-UEFI operating systems.
This is done through a combination of running the "option ROMs"
embedded into many components, and Compatibility Support Modules
(CSMs) to hand over control to a legacy operating system.
Windows 8 machines using x86 processors can offer this kind
of backwards compatibility, but they must not invoke it without
explicit user action; in other words, this "BIOS mode" must
be explicitly enabled.

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Mike Gonta
look and see - many look but few see

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10 Nov 2012, 20:48

revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 20445
Location: In your JS exploiting you and your system

revolution 11 Nov 2012, 00:42

There is also this:

http://board.flatassembler.net/topic.php?t=14691

11 Nov 2012, 00:42

revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 20445
Location: In your JS exploiting you and your system

revolution 11 Nov 2012, 00:44

Mike Gonta wrote:

much ado about nothing

Only for x86 systems. For other systems (like ARM) it is the opposite where MS have mandated that the user cannot turn off secure boot.

11 Nov 2012, 00:44

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