[regression] /dev/kmem available

Bug Description

In Hardy, the CONFIG_DEVKMEM setting was explicitly disabled. This should stay off for Intrepid and Jaunty.

Reproducer:
sudo dd if=/dev/kmem of=/dev/null bs=4k count=1

Expected results:
dd: opening `/dev/kmem': No such device or address

Results on Intrepid and Jaunty:
dd: reading `/dev/kmem': Bad address
0+0 records in
0+0 records out
0 bytes (0 B) copied, 0.00103467 s, 0.0 kB/s

ProblemType: Bug
Architecture: amd64
DistroRelease: Ubuntu 9.04
MachineType:

Package: linux-image-2.6.28-11-generic 2.6.28-11.38
ProcCmdLine: root=UUID=4817238d-bf87-48ec-9e9c-ede4cac3ea95 ro splash crashkernel=384M-2G:64M@16M,2G-:128M@16M
ProcEnviron:
PATH=(custom, user)
LANG=en_US.UTF-8
SHELL=/bin/bash
ProcVersionSignature: Ubuntu 2.6.28-11.38-generic
SourcePackage: linux

This bug was fixed in the package linux - 2.6.28-11.40

---------------
linux (2.6.28-11.40) jaunty; urgency=low

[ Amit Kucheria ]

* Disable DEVKMEM for all archs on Jaunty
- LP: #354221

[ Andy Whitcroft ]

* SAUCE: md: wait for possible pending deletes after stopping an array
- LP: #334994

[ Brad Figg ]

* ARM: Setting the bootloader for imx51 flavour.
- LP: #348382
* ARM: Add bootloader package Recomendation to iop32x and ixp4xx flavours
- LP: #348382

[ Tim Gardner ]

* SAUCE: [i915] allocate MCHBAR space & enable if necessary
- LP: #349314

[ Upstream Kernel Changes ]

* hpilo: open/close fix
- LP: #353496

-- Amit Kucheria <email address hidden> 2009年4月02日 11:26:22 -0400

If kmem is disabled in our kernels, should we be creating /dev/kmem at all?

There's no good reason for us to have it, no. However, it certainly
makes regression testing easier to already have the device file there.
;) I'm happy to lose the device node; our regression test can just create
the node first when verifying that the kernel interface is disabled.

This bug was fixed in the package linux-ports - 2.6.28-6.17

---------------
linux-ports (2.6.28-6.17) jaunty; urgency=low

[ Luke Yelavich ]

* Disable DEVKMEM for all archs on Jaunty
- LP: #354221

Rebase on top of jaunty 2.6.28-11.40:

[ Amit Kucheria ]

* Disable DEVKMEM for all archs on Jaunty
- LP: #354221

[ Andy Whitcroft ]

* SAUCE: md: wait for possible pending deletes after stopping an array
- LP: #334994

[ Brad Figg ]

* ARM: Setting the bootloader for imx51 flavour.
- LP: #348382
* ARM: Add bootloader package Recomendation to iop32x and ixp4xx flavours
- LP: #348382

[ Tim Gardner ]

* SAUCE: [i915] allocate MCHBAR space & enable if necessary
- LP: #349314

[ Upstream Kernel Changes ]

* hpilo: open/close fix
- LP: #353496

[ Alan Tull ]

* SAUCE: mx51: fix to1.1 in mxc_iomux_set_input
- LP: #348333

[ Andy Whitcroft ]

* SAUCE: acer: rfkill disable quirk for ACER Aspire One
- LP: #319825

[ Brad Figg ]

* ARM: Increase CONFIG_BLK_DEV_RAM_SIZE for imx51 flavour.
- LP: #349842
* ARM: Enable rtl8187 for imx51
- LP: #349526
* ARM: Unset CONFIG_USB_STORAGE_DEBUG for imx51
- LP: #348504

[ Bryan Wu ]

* build CRAMFS into kernel to support mounting CRAMFS initrd on iop32x
machine
- LP: #349104

[ Michael Casadevall ]

* [lpia] Change ATA, SCSI, SD, ext2-4 modules into compiled-in components
- LP: #347458

[ Rob Herring ]

* SAUCE: imx51: fec: fix cache operations for receive
- LP: #348333

[ Sam Yang ]

* SAUCE: Revert ENGR00103870 FEC reopening causes network wdog timeout
- LP: #348333
* SAUCE: imx51: fec cache flush functions are incorrect
- LP: #348333

[ Upstream Kernel Changes ]

* Bluetooth: Add fine grained mem_flags usage to btusb driver
- LP: #268502
* Bluetooth: Handle bulk URBs in btusb driver from notify callback
- LP: #268502
* Bluetooth: Submit bulk URBs along with interrupt URBs
- LP: #268502

-- Luke Yelavich <email address hidden> 2009年4月06日 18:07:33 +1000

On Sun, 2009年04月05日 at 14:07 +0000, Kees Cook wrote:

> There's no good reason for us to have it, no. However, it certainly
> makes regression testing easier to already have the device file there.
> ;) I'm happy to lose the device node; our regression test can just create
> the node first when verifying that the kernel interface is disabled.
>
It's one of the core devices in /lib/udev/devices that we ALWAYS create
in /dev and never remove even if the underlying kernel device goes away.

I'm more than happy to get rid of it, meaning that the only fixed
devices will be "null" and "console" (with ppp, loop0 and net/tun
available to force-load the modules)

Scott
--
Scott James Remnant
<email address hidden>

Accepted linux into intrepid-proposed, the package will build now and be available in a few hours. Please test and give feedback here. See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to enable and use -proposed. Thank you in advance!

First, with the 2.6.27-14.37 security update, the kernels in intrepid-proposed need to be updated to incorporate that fix.

I reproduced this issue with with the 2.6.27-14.37 kernel in intrepid-updates and can confirm that the 2.6.27-14.36 kernels in intrepid-proposed fix the issue (tested generic and server kernels on both i386 and amd64). I also saw no regressions from running the kernel-security tests in the qa-regression-tests (in which there is already two tests for this issue). Marking verification-done.

This bug was fixed in the package linux - 2.6.27-14.41

---------------
linux (2.6.27-14.41) intrepid-proposed; urgency=low

[ Stefan Bader ]

* Revert "SAUCE: input: Blacklist digitizers from joydev.c"
- LP: #300143

linux (2.6.27-14.40) intrepid-proposed; urgency=low

[ Amit Kucheria ]

* Disable DEVKMEM for all archs on Intrepid
- LP: #354221
* SAUCE: Quirk for BT USB device on MacbookPro to be reset before use
- LP: #332443

[ Andy Isaacson ]

* LIRC_PVR150: depends on VIDEO_IVTV
- LP: #341477
* SAUCE: FSAM7400: select CHECK_SIGNATURE
- LP: #341712

[ Andy Whitcroft ]

* SAUCE: hotkey quirks for various Zepto Znote and Fujitsu Amilo laptops
- LP: #330259
* SAUCE: unusual devs: add an entry for the ScanLogic SL11R-IDE 0.78
- LP: #336189

[ Anton Veretenenko ]

* SAUCE: sony-laptop: add support for Sony Vaio FW series function/media
keys
- LP: #307592

[ Ayaz Abdulla ]

* SAUCE: forcedeth: msi interrupt fix
- LP: #288281

[ Chuck Short ]

* SAUCE: [USB] Unusual Device support for Gold MP3 Player Energy
- LP: #125250

[ Ike Panhc ]

* squashfs: correct misspelling
- LP: #322306
* SAUCE: Fixing symbol name in HECI module
- LP: #336549
* Copy header files for various kernel media driver
- LP: #322732

[ Stefan Bader ]

* SAUCE: vgacon: Return the upper half of 512 character fonts
- LP: #355057
* SAUCE: input: Blacklist digitizers from joydev.c
- LP: #300143

[ Upstream Kernel Changes ]

* libata: make sure port is thawed when skipping resets
- LP: #269652
* x86-64: fix int 0ドルx80 -ENOSYS return
- LP: #339743
* rt2x00: Fix race conditions in flag handling
- LP: #258985
* USB: cdc-acm: Add another conexant modem to the quirks
- LP: #323829
* Bluetooth: Add fine grained mem_flags usage to btusb driver
- LP: #268502
* Bluetooth: Handle bulk URBs in btusb driver from notify callback
- LP: #268502
* Bluetooth: Submit bulk URBs along with interrupt URBs
- LP: #268502
* hwmon: (abituguru3) Match partial DMI board name strings
- LP: #298798
* x86: mtrr: don't modify RdDram/WrDram bits of fixed MTRRs
- LP: #292619
* sis190: add identifier for Atheros AR8021 PHY
- LP: #247889
* ath9k: implement IO serialization
- LP: #373034
* ath9k: AR9280 PCI devices must serialize IO as well
- LP: #373034
* acer-wmi: fix regression in backlight detection
- LP: #333386

-- Stefan Bader <email address hidden> 2009年8月26日 11:48:11 +0200

Intrepid Ibex reached end-of-life on 30 April 2010 so I am closing the report. The bug has been fixed in newer releases of Ubuntu.