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[Jürg Häfliger <1788578@xxxxxxxxxxxxxxxxxx>]

** Tags added: kernel-daily-bug

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https://bugs.launchpad.net/bugs/1788578

Title:
  Some test in ubuntu_bpf test_verifier failed on i386 Bionic kernel

Status in ubuntu-kernel-tests:
  Fix Released
Status in linux package in Ubuntu:
  Invalid
Status in linux source package in Bionic:
  Fix Released

Bug description:
  [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.

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