Some test in ubuntu_bpf test_verifier failed on i386 Bionic kernel

[Po-Hsu Lin]

[Impact]
Narrow loads for bpf_perf_event_data is not possible on 32-bit arches.

[Test case]
Run the bpf test_verifier.

[Potential regression]
Loading sample_period of bpf_perf_event_data may fail. Unaligned access may lead to processor exceptions on some architectures.

==============================================================

This issue was only spotted on i386 Bionic kernel.

 #146/p unpriv: spill/fill of different pointers ldx FAIL
 Unexpected error message!
 0: (bf) r6 = r10
 1: (07) r6 += -8
 2: (15) if r1 == 0x0 goto pc+3
 R1=ctx(id=0,off=0,imm=0) R6=fp-8 R10=fp0
 3: (bf) r2 = r10
 4: (07) r2 += -76
 5: (7b) *(u64 *)(r6 +0) = r2
 6: (55) if r1 != 0x0 goto pc+1
 R1=ctx(id=0,off=0,imm=0) R2=fp-76 R6=fp-8 R10=fp0 fp-8=fp
 7: (7b) *(u64 *)(r6 +0) = r1
 8: (79) r1 = *(u64 *)(r6 +0)
 9: (79) r1 = *(u64 *)(r1 +68)
 #352/p check bpf_perf_event_data->sample_period byte load permitted FAIL
 Failed to load prog 'Permission denied'!
 0: (b7) r0 = 0
 1: (71) r0 = *(u8 *)(r1 +68)
 invalid bpf_context access off=68 size=1
 #353/p check bpf_perf_event_data->sample_period half load permitted FAIL
 Failed to load prog 'Permission denied'!
 0: (b7) r0 = 0
 1: (69) r0 = *(u16 *)(r1 +68)
 invalid bpf_context access off=68 size=2
 #354/p check bpf_perf_event_data->sample_period word load permitted FAIL
 Failed to load prog 'Permission denied'!
 0: (b7) r0 = 0
 1: (61) r0 = *(u32 *)(r1 +68)
 invalid bpf_context access off=68 size=4
 #355/p check bpf_perf_event_data->sample_period dword load permitted FAIL
 Failed to load prog 'Permission denied'!
 0: (b7) r0 = 0
 1: (79) r0 = *(u64 *)(r1 +68)
 invalid bpf_context access off=68 size=8

Summary: 708 PASSED, 5 FAILED

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: linux-image-4.15.0-32-generic 4.15.0-32.35
ProcVersionSignature: User Name 4.15.0-32.35-generic 4.15.18
Uname: Linux 4.15.0-32-generic i686
AlsaDevices:
 total 0
 crw-rw---- 1 root audio 116, 1 Aug 23 08:23 seq
 crw-rw---- 1 root audio 116, 33 Aug 23 08:23 timer
AplayDevices: Error: [Errno 2] No such file or directory: 'aplay': 'aplay'
ApportVersion: 2.20.9-0ubuntu7.2
Architecture: i386
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: Thu Aug 23 08:41:26 2018
IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig': 'iwconfig'
Lsusb:
 Bus 002 Device 002: ID 8087:0020 Intel Corp. Integrated Rate Matching Hub
 Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
 Bus 001 Device 003: ID 0424:2514 Standard Microsystems Corp. USB 2.0 Hub
 Bus 001 Device 002: ID 8087:0020 Intel Corp. Integrated Rate Matching Hub
 Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
MachineType: Dell Inc. PowerEdge R310
PciMultimedia:

ProcFB: 0 mgadrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.15.0-32-generic root=UUID=7b91a2b8-2e02-407e-a51d-766f6d969020 ro
RelatedPackageVersions:
 linux-restricted-modules-4.15.0-32-generic N/A
 linux-backports-modules-4.15.0-32-generic N/A
 linux-firmware 1.173.1
RfKill: Error: [Errno 2] No such file or directory: 'rfkill': 'rfkill'
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 08/17/2011
dmi.bios.vendor: Dell Inc.
dmi.bios.version: 1.8.2
dmi.board.name: 05XKKK
dmi.board.vendor: Dell Inc.
dmi.board.version: A05
dmi.chassis.type: 23
dmi.chassis.vendor: Dell Inc.
dmi.modalias: dmi:bvnDellInc.:bvr1.8.2:bd08/17/2011:svnDellInc.:pnPowerEdgeR310:pvr:rvnDellInc.:rn05XKKK:rvrA05:cvnDellInc.:ct23:cvr:
dmi.product.name: PowerEdge R310
dmi.sys.vendor: Dell Inc.

[Ubuntu Kernel Bot (ubuntu-kernel-bot)]

This bug is missing log files that will aid in diagnosing the problem. While running an Ubuntu kernel (not a mainline or third-party kernel) please enter the following command in a terminal window:

apport-collect 1788578

and then change the status of the bug to 'Confirmed'.

If, due to the nature of the issue you have encountered, you are unable to run this command, please add a comment stating that fact and change the bug status to 'Confirmed'.

This change has been made by an automated script, maintained by the Ubuntu Kernel Team.

[Ubuntu Kernel Bot (ubuntu-kernel-bot)]

This bug is awaiting verification that the linux/4.15.0-163.171 kernel in -proposed solves the problem. Please test the kernel and update this bug with the results. If the problem is solved, change the tag 'verification-needed-bionic' to 'verification-done-bionic'. If the problem still exists, change the tag 'verification-needed-bionic' to 'verification-failed-bionic'.

If verification is not done by 5 working days from today, this fix will be dropped from the source code, and this bug will be closed.

See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to enable and use -proposed. Thank you!

[Thadeu Lima de Souza Cascardo (cascardo)]

5 tests failed with 4.15.0-162. ALL pass with 4.15.0-163.

[Launchpad Janitor (janitor)]

This bug was fixed in the package linux - 4.15.0-163.171

---------------
linux (4.15.0-163.171) bionic; urgency=medium

  * bionic/linux: 4.15.0-163.171 -proposed tracker (LP: #1949874)

  * Packaging resync (LP: #1786013)
    - [Packaging] update Ubuntu.md
    - debian/dkms-versions -- update from kernel-versions (main/2021.11.08)

  * Unable to build net/reuseport_bpf and other tests in ubuntu_kernel_selftests
    on Bionic with make command (LP: #1949889)
    - selftests: Fix loss of test output in run_kselftests.sh
    - selftests: Makefile set KSFT_TAP_LEVEL to prevent nested TAP headers
    - selftests: fix headers_install circular dependency
    - selftests: fix bpf build/test workflow regression when KBUILD_OUTPUT is set
    - selftests: vm: Fix test build failure when built by itself

  * KVM emulation failure when booting into VM crash kernel with multiple CPUs
    (LP: #1948862)
    - KVM: x86: Properly reset MMU context at vCPU RESET/INIT

  * aufs: kernel bug with apparmor and fuseblk (LP: #1948470)
    - SAUCE: aufs: bugfix, stop omitting path->mnt

  * ebpf: bpf_redirect fails with ip6 gre interfaces (LP: #1947164)
    - net: handle ARPHRD_IP6GRE in dev_is_mac_header_xmit()

  * require CAP_NET_ADMIN to attach N_HCI ldisc (LP: #1949516)
    - Bluetooth: hci_ldisc: require CAP_NET_ADMIN to attach N_HCI ldisc

  * ACL updates on OCFS2 are not revalidated (LP: #1947161)
    - ocfs2: fix remounting needed after setfacl command

  * ppc64 BPF JIT mod by 1 will not return 0 (LP: #1948351)
    - powerpc/bpf: Fix BPF_MOD when imm == 1

  * Drop "UBUNTU: SAUCE: cachefiles: Page leaking in
    cachefiles_read_backing_file while vmscan is active" (LP: #1947709)
    - Revert "UBUNTU: SAUCE: cachefiles: Page leaking in
      cachefiles_read_backing_file while vmscan is active"
    - cachefiles: Fix page leak in cachefiles_read_backing_file while vmscan is
      active

  * Some test in ubuntu_bpf test_verifier failed on i386 Bionic kernel
    (LP: #1788578)
    - bpf: fix context access in tracing progs on 32 bit archs

  * test_bpf.sh from ubuntu_kernel_selftests.net from linux ADT test failure
    with linux/4.15.0-149.153 i386 (Segmentation fault) (LP: #1934414)
    - selftests/bpf: make test_verifier run most programs
    - bpf: add couple of test cases for div/mod by zero
    - bpf: add further test cases around div/mod and others

  * Bionic update: upstream stable patchset 2021-11-02 (LP: #1949512)
    - usb: gadget: r8a66597: fix a loop in set_feature()
    - usb: musb: tusb6010: uninitialized data in tusb_fifo_write_unaligned()
    - cifs: fix incorrect check for null pointer in header_assemble
    - xen/x86: fix PV trap handling on secondary processors
    - usb-storage: Add quirk for ScanLogic SL11R-IDE older than 2.6c
    - USB: serial: cp210x: add ID for GW Instek GDM-834x Digital Multimeter
    - staging: greybus: uart: fix tty use after free
    - Re-enable UAS for LaCie Rugged USB3-FW with fk quirk
    - USB: serial: mos7840: remove duplicated 0xac24 device ID
    - USB: serial: option: add Telit LN920 compositions
    - USB: serial: option: remove duplicate USB device ID
    - USB: serial: option: add device id for Foxco...