sts-sponsors team mailing list archive

[Robie Basak <1960863@xxxxxxxxxxxxxxxxxx>]

Hello Matthew, or anyone else affected,

Accepted openssl into focal-proposed. The package will build now and be
available at
https://launchpad.net/ubuntu/+source/openssl/1.1.1f-1ubuntu2.11 in a few
hours, and then in the -proposed repository.

Please help us by testing this new package.  See
https://wiki.ubuntu.com/Testing/EnableProposed for documentation on how
to enable and use -proposed.  Your feedback will aid us getting this
update out to other Ubuntu users.

If this package fixes the bug for you, please add a comment to this bug,
mentioning the version of the package you tested, what testing has been
performed on the package and change the tag from verification-needed-
focal to verification-done-focal. If it does not fix the bug for you,
please add a comment stating that, and change the tag to verification-
failed-focal. In either case, without details of your testing we will
not be able to proceed.

Further information regarding the verification process can be found at
https://wiki.ubuntu.com/QATeam/PerformingSRUVerification .  Thank you in
advance for helping!

N.B. The updated package will be released to -updates after the bug(s)
fixed by this package have been verified and the package has been in
-proposed for a minimum of 7 days.

** Changed in: openssl (Ubuntu Focal)
       Status: In Progress => Fix Committed

** Tags added: verification-needed verification-needed-focal

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https://bugs.launchpad.net/bugs/1960863

Title:
  armv8 paca: poly1305 users see segfaults when pointer authentication
  in use on AWS Graviton 3 instances

Status in openssl package in Ubuntu:
  Fix Released
Status in openssl source package in Focal:
  Fix Committed

Bug description:
  [Impact]

  Support for hardware pointer authentication for armv8 systems was
  merged in openssl 1.1.1f, but it contains a bug in the implementation
  for poly1305 message authenticated code routines, which causes the
  calling program to fail pointer authentication, which causes the
  program to crash with a segmentation fault.

  You can easily test it by accessing any website that uses poly1305.
  There is no workaround except use a different MAC.

  [Testcase]

  This bug applies to armv8 systems which support pointer
  authentication. Start an armv8 instance, such as a c7g graviton 3
  instance on AWS, and make sure the paca flag is present in lscpu:

  $ grep paca /proc/cpuinfo
  Features : fp asimd evtstrm aes pmull sha1 sha2 crc32 atomics fphp asimdhp cpuid asimdrdm jscvt fcma lrcpc dcpop sha3 sm3 sm4 asimddp sha512 sve asimdfhm dit uscat ilrcpc flagm ssbs paca pacg dcpodp svei8mm svebf16 i8mm bf16 dgh rng

  Next, attempt to connect to any website that uses poly1305 MAC.

  $ curl https://services.gradle.org/distributions/gradle-7.2-bin.zip --output gradle-7.2.bin
  % Total % Received % Xferd Average Speed Time Time Time Current
  Dload Upload Total Spent Left Speed
  0 0 0 0 0 0 0 0 --:--:-- --:--:-- --:--:-- 0Segmentation fault (core dumped)

  There is a test package available in the following ppa:

  https://launchpad.net/~mruffell/+archive/ubuntu/sf327917-test

  Install it, and poly1305 operations will no longer segfault.

  [Where problems could occur]

  The patch changes the order of operations for loading the SP and
  checking the AUTIASP against it, from checking the AUTIASP against
  nothing then loading the correct SP to check with, to the correct
  loading the SP and then checking the AUTIASP against the SP.

  This only changes one code path for armv8 systems, and other
  architectures are not affected. This is also only limited to poly1305
  MAC.

  If a regression were to occur, it would only affect users of poly1035
  MAC on armv8 with pacs support.

  [Other info]

  The fix landed upstream in openssl 1.1.1i with the following commit:

  commit 5795acffd8706e1cb584284ee5bb3a30986d0e75
  Author: Ard Biesheuvel <ard.biesheuvel@xxxxxxx>
  Date:   Tue Oct 27 18:02:40 2020 +0100
  Subject: crypto/poly1305/asm: fix armv8 pointer authentication
  Link: https://github.com/openssl/openssl/commit/5795acffd8706e1cb584284ee5bb3a30986d0e75

  This commit is already present in Impish onward. Only Focal needs the
  fix.

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