Looks like the change to how /proc/kallsyms displays addresses was
introduced in:
commit d97106ab53f812910a62d18afb9dbe882819c1ba
Author: Linus Torvalds <torva...@linux-foundation.org>
Date: Sat Jan 3 11:46:17 2009 -0800
Make %p print '(null)' for NULL pointers
Upstream fixed it in 3a129cc2151425e5aeb69aeb25fbc994ec738137 but was
not originally submitted to linux-stable (that has been rectified).
It could be worked around in the qrt script, but I'm not convinced
that's the right thing to do here.
It should be noted that the behavior that the script is testing for,
kernel addresses in /proc/kallsyms not being visible to unprivileged
processes, is correct here. So there's no security impact from this, and
it should not block promoting kernels, from the security team's
perspective.
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https://bugs.launchpad.net/bugs/1751202
Title:
test_095_kernel_symbols_missing in ubuntu_qrt_kernel_security failed
on Bionic
Status in QA Regression Testing:
New
Status in linux package in Ubuntu:
Triaged
Bug description:
This issue could be found on AMD64, ppc64le, ARM64, s390x (not sure
about i386, which was not tested because of the deployment issue in
the last cycle)
Steps:
1. Deploy an AMD64 system with Bionic
2. sudo apt-get install git python-minimal -y
3. git clone --depth=1 git://kernel.ubuntu.com/ubuntu/autotest-client-tests
-b master-next
4. git clone --depth=1 git://kernel.ubuntu.com/ubuntu/autotest
5. rm -fr autotest/client/tests
6. ln -sf ~/autotest-client-tests autotest/client/tests
7. AUTOTEST_PATH=/home/ubuntu/autotest sudo -E
autotest/client/autotest-local --verbose
autotest/client/tests/ubuntu_qrt_kernel_security/control
ERROR: test_095_kernel_symbols_missing (__main__.KernelSecurityTest)
kernel addresses in kallsyms and modules are zeroed out
----------------------------------------------------------------------
Traceback (most recent call last):
File "./test-kernel-security.py", line 1508, in
test_095_kernel_symbols_missing
self._check_pK_files(expected)
File "./test-kernel-security.py", line 1440, in _check_pK_files
expected)
File "./test-kernel-security.py", line 1401, in _read_twice
self.assertEqual(expected, 0 == int(address, 16), "%s: user saw %s" %
(filename, address))
ValueError: invalid literal for int() with base 16: '(null)'
ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: linux-image-4.15.0-10-generic 4.15.0-10.11
ProcVersionSignature: User Name 4.15.0-10.11-generic 4.15.3
Uname: Linux 4.15.0-10-generic x86_64
AlsaDevices:
total 0
crw-rw---- 1 root audio 116, 1 Feb 23 04:53 seq
crw-rw---- 1 root audio 116, 33 Feb 23 04:53 timer
AplayDevices: Error: [Errno 2] No such file or directory: 'aplay': 'aplay'
ApportVersion: 2.20.8-0ubuntu10
Architecture: amd64
ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord':
'arecord'
AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq',
'/dev/snd/timer'] failed with exit code 1:
CurrentDmesg:
Date: Fri Feb 23 06:57:48 2018
IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig': 'iwconfig'
MachineType: Dell Inc. PowerEdge R320
PciMultimedia:
ProcEnviron:
TERM=xterm-256color
PATH=(custom, no user)
XDG_RUNTIME_DIR=<set>
LANG=C.UTF-8
SHELL=/bin/bash
ProcFB: 0 mgadrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.15.0-10-generic
root=UUID=0845f9a0-ab8c-4dfa-8385-af21f2f2b9ad ro
RelatedPackageVersions:
linux-restricted-modules-4.15.0-10-generic N/A
linux-backports-modules-4.15.0-10-generic N/A
linux-firmware 1.171
RfKill: Error: [Errno 2] No such file or directory: 'rfkill': 'rfkill'
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 05/11/2012
dmi.bios.vendor: Dell Inc.
dmi.bios.version: 1.2.4
dmi.board.name: 0DY523
dmi.board.vendor: Dell Inc.
dmi.board.version: A03
dmi.chassis.type: 23
dmi.chassis.vendor: Dell Inc.
dmi.modalias:
dmi:bvnDellInc.:bvr1.2.4:bd05/11/2012:svnDellInc.:pnPowerEdgeR320:pvr:rvnDellInc.:rn0DY523:rvrA03:cvnDellInc.:ct23:cvr:
dmi.product.name: PowerEdge R320
dmi.sys.vendor: Dell Inc.
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