Logitech Revue Kernel - Revision history

KernelJayOmega: /* Overview */

2011-02-05T00:00:21Z

Overview

← Older revision		Revision as of 00:00, 5 February 2011
Line 3:		Line 3:

	It should also be noted that reading through this Wiki page should illustrate that the [http://googletv-mirrored-source.googlecode.com/hg/linux/linux-2.6.23-gtv.tar.bz2?r=27705a482273e3a34e8bcdbfb4fdad9afcd65e93 kernel source posted on Google's mirrored source site] is not a complete representation of the Logitech Revue's kernel.		It should also be noted that reading through this Wiki page should illustrate that the [http://googletv-mirrored-source.googlecode.com/hg/linux/linux-2.6.23-gtv.tar.bz2?r=27705a482273e3a34e8bcdbfb4fdad9afcd65e93 kernel source posted on Google's mirrored source site] is not a complete representation of the Logitech Revue's kernel.

			Refer to [https://opensource.logitech.com opensource.logitech.com] for the complete Logitech Revue GPL release.

	=== Kernel Configuration ===		=== Kernel Configuration ===

KernelJayOmega: FTDI notes

2011-01-23T18:32:57Z

FTDI notes

@@ Line 59: / Line 59: @@
 	osal_linux 23568 25 alsa_shim,pvrsrvkm,edl_audio_dac_drv_linux,edl_thermal,vidcap_ce4X00,ismdavcap_shim,ismdbufmon,ismdaudio,ismdvidrend,ismdvidpproc,ismdviddec_v2,ismddemux_v2,ismdclock_recovery,ismdclock,ismdcore,gdl_mm,sec_kernel,intel_ce_pm,clock_control,idl_spi,idl_gpio,idl_i2c,sven_linux,system_utils_linux,pal_linux, Live 0xac0e3000
 </pre>
 === Virtual Kernel Memory Layout ===

KernelJayOmega: added category Kernels

2011-01-23T18:27:38Z

added category Kernels

← Older revision		Revision as of 18:27, 23 January 2011
Line 81:		Line 81:

	[[Category:Logitech Revue\|Kernel]]		[[Category:Logitech Revue\|Kernel]]
			[[Category:Kernels\|Logitech Revue]]

KernelJayOmega at 18:21, 23 January 2011

2011-01-23T18:21:06Z

@@ Line 12: / Line 12: @@
 * [[CONFIG_MODULE_SIG]]=y : Module signatures are enabled.  Logitech's included kernel modules contain a .signature section which is checked against public keys compiled into the kernel.  This effectively limits execution of new code at privilege level 0 even once root access is achieved.  (This is an option which is not implemented in the released GPL sources.)
 * [[CONFIG_DEVMEM_PROTECT]]=y : This most likely enables a patch which filters access to the /dev/mem character device which could otherwise be used to create a rootkit by directly patching the running kernel. (This is another option which indicates that the Logitech Revue kernel has been patched in ways that the available GPL source code was not.)
 === Virtual Kernel Memory Layout ===

KernelJayOmega: changed wording about gzip header

2011-01-22T21:21:43Z

changed wording about gzip header

← Older revision		Revision as of 21:21, 22 January 2011
Line 1:		Line 1:
	=== Overview ===		=== Overview ===
	The Logitech Revue's Operating System is based around Linux kernel based on 2.6.23.18 code. The kernel lives in /system/boot/kernel which can be extracted from an OTA update file. The kernel file appears to contain bootstrap loader ~~(and some other data) piggy-backed to~~ vmlinux.bin.gz which has ~~been observed to reside about~~ 0x37f5 bytes into the composite kernel image. Several security measures have been put in place ensuring that many attacks commonly used against other operating systems are not applicable.		The Logitech Revue's Operating System is based around Linux kernel based on 2.6.23.18 code. The kernel lives in /system/boot/kernel which can be extracted from an OTA update file. The kernel file appears to contain bootstrap loader, etc wrapped around vmlinux.bin.gz which has its gzip header 0x37f5 bytes into the composite kernel image we have examined. Several security measures have been put in place ensuring that many attacks commonly used against other operating systems are not applicable.

	It should also be noted that reading through this Wiki page should illustrate that the [http://googletv-mirrored-source.googlecode.com/hg/linux/linux-2.6.23-gtv.tar.bz2?r=27705a482273e3a34e8bcdbfb4fdad9afcd65e93 kernel source posted on Google's mirrored source site] is not a complete representation of the Logitech Revue's kernel.		It should also be noted that reading through this Wiki page should illustrate that the [http://googletv-mirrored-source.googlecode.com/hg/linux/linux-2.6.23-gtv.tar.bz2?r=27705a482273e3a34e8bcdbfb4fdad9afcd65e93 kernel source posted on Google's mirrored source site] is not a complete representation of the Logitech Revue's kernel.
Line 26:		Line 26:
	The kernel lives in /system/boot/kernel which can be extracted from an OTA update file or from a rooted Revue. The kernel file appears to contain bootstrap loader (and possibly some other data) piggy-backed to vmlinux.bin.gz which has been observed to reside about 0x37f5 bytes into the composite kernel image.		The kernel lives in /system/boot/kernel which can be extracted from an OTA update file or from a rooted Revue. The kernel file appears to contain bootstrap loader (and possibly some other data) piggy-backed to vmlinux.bin.gz which has been observed to reside about 0x37f5 bytes into the composite kernel image.

	To extract vmlinux.bin.gz from /system/boot/kernel:		To extract vmlinux.bin.gz from /system/boot/kernel, use dd to copy starting at the gzip header:
	dd if=./ota_update/system/boot/kernel of=vmlinux.bin.gz bs=$((0x37f5)) skip=1		dd if=./ota_update/system/boot/kernel of=vmlinux.bin.gz bs=$((0x37f5)) skip=1
	Now you can decompress the vmlinux.bin.gz		Now you can decompress the vmlinux.bin.gz

KernelJayOmega: Added note about config.gz

2011-01-22T21:15:13Z

Added note about config.gz

← Older revision		Revision as of 21:15, 22 January 2011
Line 3:		Line 3:

	It should also be noted that reading through this Wiki page should illustrate that the [http://googletv-mirrored-source.googlecode.com/hg/linux/linux-2.6.23-gtv.tar.bz2?r=27705a482273e3a34e8bcdbfb4fdad9afcd65e93 kernel source posted on Google's mirrored source site] is not a complete representation of the Logitech Revue's kernel.		It should also be noted that reading through this Wiki page should illustrate that the [http://googletv-mirrored-source.googlecode.com/hg/linux/linux-2.6.23-gtv.tar.bz2?r=27705a482273e3a34e8bcdbfb4fdad9afcd65e93 kernel source posted on Google's mirrored source site] is not a complete representation of the Logitech Revue's kernel.

			=== Kernel Configuration ===
			Fortunately the Revue's kernel provides /proc/config.gz which allows a glimpse into the kernel in advance of a proper GPL release from Logitech.

	=== Security Measures ===		=== Security Measures ===

KernelJayOmega: Added section on extracting vmlinux.bin

2011-01-22T21:06:31Z

Added section on extracting vmlinux.bin

← Older revision		Revision as of 21:06, 22 January 2011
Line 1:		Line 1:
	=== Overview ===		=== Overview ===
	The Logitech Revue's Operating System is based around Linux kernel based on 2.6.23.18 code. The kernel lives in /system/boot/kernel which can be extracted from an OTA update file. The kernel file appears to contain bootstrap loader (and ~~possibly~~ some other data) piggy-backed to vmlinux.bin.gz which has been observed to reside about 0x37f5 bytes into the composite kernel image. Several security measures have been put in place ensuring that many attacks commonly used against other operating systems are not applicable.		The Logitech Revue's Operating System is based around Linux kernel based on 2.6.23.18 code. The kernel lives in /system/boot/kernel which can be extracted from an OTA update file. The kernel file appears to contain bootstrap loader (and some other data) piggy-backed to vmlinux.bin.gz which has been observed to reside about 0x37f5 bytes into the composite kernel image. Several security measures have been put in place ensuring that many attacks commonly used against other operating systems are not applicable.

	It should also be noted that reading through this Wiki page should illustrate that the [http://googletv-mirrored-source.googlecode.com/hg/linux/linux-2.6.23-gtv.tar.bz2?r=27705a482273e3a34e8bcdbfb4fdad9afcd65e93 kernel source posted on Google's mirrored source site] is not a complete representation of the Logitech Revue's kernel.		It should also be noted that reading through this Wiki page should illustrate that the [http://googletv-mirrored-source.googlecode.com/hg/linux/linux-2.6.23-gtv.tar.bz2?r=27705a482273e3a34e8bcdbfb4fdad9afcd65e93 kernel source posted on Google's mirrored source site] is not a complete representation of the Logitech Revue's kernel.
Line 19:		Line 19:
	.data : 0x803925b8 - 0x80481398 ( 955 kB)		.data : 0x803925b8 - 0x80481398 ( 955 kB)
	.text : 0x80100000 - 0x803925b8 (2633 kB)		.text : 0x80100000 - 0x803925b8 (2633 kB)

			=== Examining the Kernel Image ===
			The kernel lives in /system/boot/kernel which can be extracted from an OTA update file or from a rooted Revue. The kernel file appears to contain bootstrap loader (and possibly some other data) piggy-backed to vmlinux.bin.gz which has been observed to reside about 0x37f5 bytes into the composite kernel image.

			To extract vmlinux.bin.gz from /system/boot/kernel:
			dd if=./ota_update/system/boot/kernel of=vmlinux.bin.gz bs=$((0x37f5)) skip=1
			Now you can decompress the vmlinux.bin.gz
			gzip -d vmlinux.bin.gz

			At this point you have the vmlinux.bin which is essentially vmlinux minus the ELF headers and symbols.

	[[Category:Logitech Revue\|Kernel]]		[[Category:Logitech Revue\|Kernel]]

KernelJayOmega: Removed space

2011-01-22T20:49:28Z

Removed space

← Older revision		Revision as of 20:49, 22 January 2011
Line 1:		Line 1:

	=== Overview ===		=== Overview ===
	The Logitech Revue's Operating System is based around Linux kernel based on 2.6.23.18 code. The kernel lives in /system/boot/kernel which can be extracted from an OTA update file. The kernel file appears to contain bootstrap loader (and possibly some other data) piggy-backed to vmlinux.bin.gz which has been observed to reside about 0x37f5 bytes into the composite kernel image. Several security measures have been put in place ensuring that many attacks commonly used against other operating systems are not applicable.		The Logitech Revue's Operating System is based around Linux kernel based on 2.6.23.18 code. The kernel lives in /system/boot/kernel which can be extracted from an OTA update file. The kernel file appears to contain bootstrap loader (and possibly some other data) piggy-backed to vmlinux.bin.gz which has been observed to reside about 0x37f5 bytes into the composite kernel image. Several security measures have been put in place ensuring that many attacks commonly used against other operating systems are not applicable.

KernelJayOmega: removed toc

2011-01-22T20:45:51Z

removed toc

← Older revision		Revision as of 20:45, 22 January 2011
Line 1:		Line 1:
	~~{{Revue toc Inline}}~~

	=== Overview ===		=== Overview ===

KernelJayOmega: added toc

2011-01-22T20:45:07Z

added toc

← Older revision		Revision as of 20:45, 22 January 2011
Line 1:		Line 1:
			{{Revue toc Inline}}

	=== Overview ===		=== Overview ===
	The Logitech Revue's Operating System is based around Linux kernel based on 2.6.23.18 code. The kernel lives in /system/boot/kernel which can be extracted from an OTA update file. The kernel file appears to contain bootstrap loader (and possibly some other data) piggy-backed to vmlinux.bin.gz which has been observed to reside about 0x37f5 bytes into the composite kernel image. Several security measures have been put in place ensuring that many attacks commonly used against other operating systems are not applicable.		The Logitech Revue's Operating System is based around Linux kernel based on 2.6.23.18 code. The kernel lives in /system/boot/kernel which can be extracted from an OTA update file. The kernel file appears to contain bootstrap loader (and possibly some other data) piggy-backed to vmlinux.bin.gz which has been observed to reside about 0x37f5 bytes into the composite kernel image. Several security measures have been put in place ensuring that many attacks commonly used against other operating systems are not applicable.