Please enable CONFIG_UBSAN_BOUNDS

[Kees Cook]

Enabling CONFIG_UBSAN_BOUNDS is fast and provides good coverage for out-of-bounds array indexing (i.e. it catchings the things that CONFIG_FORTIFY doesn't).

[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 1914685

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.

[Kees Cook (kees)]

This is a CONFIG request, do no apport collection required. :)

[Brian Murray (brian-murray)]

The Groovy Gorilla has reached end of life, so this bug will not be fixed for that release

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

This bug is awaiting verification that the 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!

[Launchpad Janitor (janitor)]

This bug was fixed in the package linux - 5.13.0-16.16

---------------
linux (5.13.0-16.16) impish; urgency=medium

  * impish/linux: 5.13.0-16.16 -proposed tracker (LP: #1942611)

  * Miscellaneous Ubuntu changes
    - [Config] update toolchain in configs

  * Miscellaneous upstream changes
    - Revert "UBUNTU: [Config] Enable CONFIG_UBSAN_BOUNDS"

 -- Andrea Righi <email address hidden> Fri, 03 Sep 2021 16:21:14 +0200

[Rashad Tatum (rmtatum)]

CONFIG_UBSAN_TRAP is preventing some AMD systems from booting.
See: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1942684

[Cristiano Rodrigues (microcris)]

It is preventing AMD and Intel systems from booting.
I'm also affected by this and my system is an Intel system.

[Cristiano Rodrigues (microcris)]

I'm uploading the kernel log from linux 5.15, but it is the same for linux 5.14.X

[Rashad Tatum (rmtatum)]

So, 5.14.7 and NVIDIA 470.74 fixes the boot issue. However, isn't it potentially harmful to leave CONFIG_UBSAN_TRAP enabled in production builds? The documentation for the flag seems to indicate that warnings would be turned into the errors.

https://github.com/torvalds/linux/blob/master/lib/Kconfig.ubsan#L20

As I understand, CONFIG_UBSAN_TRAP is needed to enable CONFIG_UBSAN_LOCAL_BOUNDS, but the issue mentions CONFIG_UBSAN_BOUNDS.

[Launchpad Janitor (janitor)]

This bug was fixed in the package linux-oracle - 5.13.0-1008.10

---------------
linux-oracle (5.13.0-1008.10) impish; urgency=medium

  * impish/linux-oracle: 5.13.0-1008.10 -proposed tracker (LP: #1946331)

  * Miscellaneous Ubuntu changes
    - [Config] update toolchain version in configs after rebase

  [ Ubuntu: 5.13.0-19.19 ]

  * impish/linux: 5.13.0-19.19 -proposed tracker (LP: #1946337)
  * impish:linux-aws 5.13 panic during systemd autotest (LP: #1946001)
    - [Config] disable KFENCE

  [ Ubuntu: 5.13.0-18.18 ]

  * impish/linux: 5.13.0-18.18 -proposed tracker (LP: #1945995)
  * [21.10 FEAT] KVM: Use interpretation of specification exceptions
    (LP: #1932157)
    - KVM: s390: Enable specification exception interpretation

 -- Andrea Righi <email address hidden> Fri, 08 Oct 2021 17:26:41 +0200

[Brian Murray (brian-murray)]

The Hirsute Hippo has reached End of Life, so this bug will not be fixed for that release.