Ubuntu
linux-aws package

AWS: arm64: pauth: don't sign leaf functions

Bug #2043811 reported by Tim Gardner
6
This bug affects 1 person
Affects Status Importance Assigned to Milestone
linux-aws (Ubuntu)
Fix Released
Undecided
Unassigned
Jammy
Fix Released
Undecided
Unassigned

Bug Description

SRU Justification

[Impact]

From our experiments, we found that not signing leaf functions on AWS Graviton instances helps improve application performance. We would like to have the patch https://github.com/torvalds/linux/commit/c68cf5285e1896a2b725ec01a1351f08610165b8 backported to Ubuntu 5.15, 5.19 and 6.2 kernels. We saw some of these performance improvements: NGINX 1%, MySQL 2%, PyTorch 2%

[Test Plan]

AWS tested.

[Regression Potential]

Arm64 binaries may not work correctly.

[Other Info]

SF: #00372369

Tim Gardner (timg-tpi)
affects: linux (Ubuntu) → linux-aws (Ubuntu)
Changed in linux-aws (Ubuntu Lunar):
assignee: nobody → Tim Gardner (timg-tpi)
importance: Undecided → Medium
status: New → In Progress
Changed in linux-aws (Ubuntu):
status: New → Fix Released
Revision history for this message
Kevin Becker (kevinbecker) wrote :

Patches sent to mailing list:

Jammy: https://lists.ubuntu.com/archives/kernel-team/2024-February/148619.html

Revision history for this message
Kevin Becker (kevinbecker) wrote :

Updated to target Jammy since we're not fixing this in Lunar.

Changed in linux-aws (Ubuntu Jammy):
status: New → In Progress
no longer affects: linux-aws (Ubuntu Lunar)
Revision history for this message
Ubuntu Kernel Bot (ubuntu-kernel-bot) wrote :

This bug is awaiting verification that the linux-aws/5.15.0-1056.61 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-linux-aws' to 'verification-done-jammy-linux-aws'. If the problem still exists, change the tag 'verification-needed-jammy-linux-aws' to 'verification-failed-jammy-linux-aws'.

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-aws-v2 verification-needed-jammy-linux-aws
Revision history for this message
Kevin Becker (kevinbecker) wrote :

Confirmed as working by Amazon.

tags: added: verification-done-jammy-linux-aws
removed: verification-needed-jammy-linux-aws
Kevin Becker (kevinbecker)
Changed in linux-aws (Ubuntu Jammy):
status: In Progress → Fix Released
Revision history for this message
Ubuntu Kernel Bot (ubuntu-kernel-bot) wrote :

This bug is awaiting verification that the linux-aws-fips/5.15.0-1056.61+fips1 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-linux-aws-fips' to 'verification-done-jammy-linux-aws-fips'. If the problem still exists, change the tag 'verification-needed-jammy-linux-aws-fips' to 'verification-failed-jammy-linux-aws-fips'.

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-aws-fips-v2 verification-needed-jammy-linux-aws-fips
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