[Bug 1944621] Re: sshd in chroot has regression with glibc 2.34

[Launchpad Bug Tracker]

This bug was fixed in the package openssh - 1:8.4p1-6ubuntu2

---------------
openssh (1:8.4p1-6ubuntu2) impish; urgency=medium

  * Configure with ac_cv_func_closefrom=no to avoid an incompatibility
    with glibc 2.34's fallback_closefrom function (LP: #1944621)

 -- William 'jawn-smith' Wilson <william.wilson at canonical.com>  Tue, 21
Sep 2021 22:08:39 +0000

** Changed in: openssh (Ubuntu)
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1944621

Title:
  sshd in chroot has regression with glibc 2.34

Status in openssh package in Ubuntu:
  Fix Released

Bug description:
  A regression to sshd running in a chroot exists under the following
  conditions:

  1) sshd was built with glibc 2.34
  2) sshd is running with a kernel that does not define the close_range syscall (kernel <= 5.8)
  3) /proc/self/fd does not exist in the chroot

  The glibc 2.34 implementation of fallback_closefrom fails if
  /proc/self/fd is not present, which is a valid sshd use case.

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