[Bug 1851263] Re: Ubuntu 18.04.3 LTS bump Glibc 2.27 to the latest stable

[Steve Langasek]

Hello Romain, or anyone else affected,

Accepted glibc into bionic-proposed. The package will build now and be
available at https://launchpad.net/ubuntu/+source/glibc/2.27-3ubuntu1.3
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-
bionic to verification-done-bionic. If it does not fix the bug for you,
please add a comment stating that, and change the tag to verification-
failed-bionic. 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: glibc (Ubuntu Bionic)
       Status: New => Fix Committed

** Tags added: verification-needed verification-needed-bionic

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https://bugs.launchpad.net/bugs/1851263

Title:
  Ubuntu 18.04.3 LTS bump Glibc 2.27 to the latest stable

Status in glibc package in Ubuntu:
  Confirmed
Status in glibc source package in Bionic:
  Fix Committed

Bug description:
  [Impact]

  * Ubuntu 18.04 is missing various stability and performance fixes that
  have been added to upstream's 2.27 branch. The accumulated changes are
  known to fix various issues already reported to Launchpad.

  [Test Case]
  * Observe that debian/patches/git-updates-2.diff contains the missing upstream commits intended to be backported.
  * Observe the patch being applied at build time.

  [Regression Potential]
  * Any form of regression is possible including hangs, live locks and crashes due to the broad range of fixes to be backported. In addition to the standard autopkgtests it is recommended to keep the packages in bionic-proposed longer and call for testing on additional public channels, such as on the ubuntu-devel mailing list.

  [Original Bug Text]

  Hi,

  I updated from ubuntu 14.04 to 18.04 and installed a custom (old)
  application.

  When starting the application it stop immediately with this error message:
  "glibc detected an invalid stdio handle"

  This error message was added by commit [1] "libio: Implement vtable
  verification [BZ #20191]" to fix a security issue [2].

  I tested with several Linux distribution (so different libc version)
  and the application is working fine with Fedora 30 (Glibc 2.29).

  There is an interesting patch [3] from Glibc 2.28 which was backported
  to Glibc 2.27 [4] "libio: Disable vtable validation in case of
  interposition [BZ #23313]"

  But Ubuntu 18.04 is still using an old Glibc 2.27 version (from 02-2018).
  Here is the Glibc version used in 18.04:
  $ dpkg -s libc6
  [...]
  Version: 2.27-3ubuntu1

  Looking at the changelog, ubuntu updated Glibc 2.27 the 16 Apr 2018
  but there is a lot of fix from upstream Glibc 2.27 stable branch. The
  one I'm looking for was merged the 07-2018.

  It would be great if Ubuntu 18.04 can update Glibc to the latest
  stable version.

  Best regards,
  Romain

  [1] https://sourceware.org/git/?p=glibc.git;a=commitdiff;h=db3476aff19b75c4fdefbe65fcd5f0a90588ba51
  [2] https://dhavalkapil.com/blogs/FILE-Structure-Exploitation
  [3] https://sourceware.org/git/?p=glibc.git;a=commitdiff;h=c402355dfa7807b8e0adb27c009135a7e2b9f1b0
  [4] https://sourceware.org/git/?p=glibc.git;a=commitdiff;h=3bb748257405e94e13de76573a4e9da1cfd961d0

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