Ubuntu
linux-bluefield package

mlxbf-pmc: error when reading unprogrammed events

  1. Jammy (22.04)
  2. Bug #1989172
Bug #1989172 reported by Shravan Kumar Ramani
6
This bug affects 1 person
Affects Status Importance Assigned to Milestone
linux-bluefield (Ubuntu)
Invalid
Undecided
Unassigned
Focal
Fix Released
Undecided
Unassigned
Jammy
Fix Committed
Undecided
Unassigned

Bug Description

SRU Justification:

[Impact]
When the counters are not programmed to monitor any events, reading the "event<n>" file results in the following error:
cat: /sys/class/hwmon/hwmon0/smmu0/event0: Invalid argument
This is misleading and instead needs to indicate that the counter is currently not enabled.

[Fix]
* First, skip the check for whether the counter is enabled when reading the event info. If the counter is not enabled, it should return 0, which is the default value when coming out of reset.
* 0 is not a valid event in most blocks as per the respective event lists, so add a "Disable" event to all the event lists.

[Test Case]
Without the fix, reading any "event" file right after reset when the counters are not programmed should result in the following error:
cat: /sys/class/hwmon/hwmon0/smmu0/event0: Invalid argumen
With the fix, it should instead print:
0x0: DISABLE

[Regression Potential]
Can be considered minimal

CVE References

Kleber Sacilotto de Souza (kleber-souza)
Changed in linux-bluefield (Ubuntu):
status: New → Invalid
Changed in linux-bluefield (Ubuntu Focal):
status: New → Fix Committed
Revision history for this message
Ubuntu Kernel Bot (ubuntu-kernel-bot) wrote :

This bug is awaiting verification that the linux-bluefield/5.4.0-1047.52 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-focal' to 'verification-done-focal'. If the problem still exists, change the tag 'verification-needed-focal' to 'verification-failed-focal'.

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!

Shravan Kumar Ramani (sramani)
tags: added: verification-done-focal
Kleber Sacilotto de Souza (kleber-souza)
Changed in linux-bluefield (Ubuntu Jammy):
status: New → Fix Committed
Revision history for this message
Ubuntu Kernel Bot (ubuntu-kernel-bot) wrote :

This bug is awaiting verification that the linux-bluefield/5.15.0-1008.10 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-jammy' to 'verification-done-jammy'. If the problem still exists, change the tag 'verification-needed-jammy' to 'verification-failed-jammy'.

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!

Shravan Kumar Ramani (sramani)
tags: added: verification-done-jammy
Revision history for this message
Launchpad Janitor (janitor) wrote :
Download full text (20.4 KiB)

This bug was fixed in the package linux-bluefield - 5.4.0-1047.52

---------------
linux-bluefield (5.4.0-1047.52) focal; urgency=medium

  * focal/linux-bluefield: 5.4.0-1047.52 -proposed tracker (LP: #1989866)

  * Focal update: v5.4.208 upstream stable release (LP: #1988225)
    - [Config] bluefield: updateconfigs for IMA_TEMPLATE
    - [Config] bluefield: updateconfigs for REFCOUNT_FULL

  * mlxbf-pmc: error when reading unprogrammed events (LP: #1989172)
    - SAUCE: mlxbf-pmc: Fix error when reading unprogrammed events

  * mlxbf_gige: need to clear MDIO gateway lock after read (LP: #1989495)
    - SAUCE: mlxbf_gige: clear MDIO gateway lock after read

  [ Ubuntu: 5.4.0-128.144 ]

  * focal/linux: 5.4.0-128.144 -proposed tracker (LP: #1990152)
  * CVE-2022-3176
    - io_uring: disable polling pollfree files
  * ip/nexthop: fix default address selection for connected nexthop
    (LP: #1988809)
    - selftests/net: test nexthop without gw
  * ip/nexthop: fix default address selection for connected nexthop
    (LP: #1988809) // icmp_redirect.sh in ubuntu_kernel_selftests failed on
    Jammy 5.15.0-49.55 (LP: #1990124)
    - ip: fix triggering of 'icmp redirect'

  [ Ubuntu: 5.4.0-127.143 ]

  * focal/linux: 5.4.0-127.143 -proposed tracker (LP: #1989892)
  * Packaging resync (LP: #1786013)
    - debian/dkms-versions -- update from kernel-versions (main/2022.09.19)
  * [UBUNTU 20.04] mlx5 driver crashes on accessing device attributes during
    recovery (LP: #1987287)
    - net/mlx5: Avoid processing commands before cmdif is ready
  * Focal update: v5.4.210 upstream stable release (LP: #1989230)
    - thermal: Fix NULL pointer dereferences in of_thermal_ functions
    - ACPI: video: Force backlight native for some TongFang devices
    - ACPI: video: Shortening quirk list by identifying Clevo by board_name only
    - ACPI: APEI: Better fix to avoid spamming the console with old error logs
    - bpf: Verifer, adjust_scalar_min_max_vals to always call update_reg_bounds()
    - selftests/bpf: Extend verifier and bpf_sock tests for dst_port loads
    - bpf: Test_verifier, #70 error message updates for 32-bit right shift
    - KVM: Don't null dereference ops->destroy
    - selftests: KVM: Handle compiler optimizations in ucall
    - media: v4l2-mem2mem: Apply DST_QUEUE_OFF_BASE on MMAP buffers across ioctls
    - macintosh/adb: fix oob read in do_adb_query() function
    - x86/speculation: Add RSB VM Exit protections
    - x86/speculation: Add LFENCE to RSB fill sequence
    - Linux 5.4.210
  * Focal update: v5.4.209 upstream stable release (LP: #1989228)
    - Bluetooth: L2CAP: Fix use-after-free caused by l2cap_chan_put
    - ntfs: fix use-after-free in ntfs_ucsncmp()
    - s390/archrandom: prevent CPACF trng invocations in interrupt context
    - tcp: Fix data-races around sysctl_tcp_dsack.
    - tcp: Fix a data-race around sysctl_tcp_app_win.
    - tcp: Fix a data-race around sysctl_tcp_adv_win_scale.
    - tcp: Fix a data-race around sysctl_tcp_frto.
    - tcp: Fix a data-race around sysctl_tcp_nometrics_save.
    - ice: check (DD | EOF) bits on Rx descriptor rather than (EOP | RS)
    - ice: do not setup vlan for loopback VSI
    - scsi: ufs...

Changed in linux-bluefield (Ubuntu Focal):
status: Fix Committed → Fix Released
Revision history for this message
Ubuntu Kernel Bot (ubuntu-kernel-bot) wrote :

This bug is awaiting verification that the linux-bluefield/5.15.0-1010.12 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-jammy' to 'verification-done-jammy'. If the problem still exists, change the tag 'verification-needed-jammy' to 'verification-failed-jammy'.

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!

tags: added: kernel-spammed-jammy-linux-bluefield verification-needed-jammy
removed: verification-done-jammy
Shravan Kumar Ramani (sramani)
tags: added: verification-done-jammy
removed: verification-needed-jammy
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