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

[William Wilson]

This patch moves the configuration option to the appropriate section of
d/rules and adds a reference to this bug report.

** Patch added: "lp1944621.debdiff"
   https://bugs.launchpad.net/ubuntu/+source/openssh/+bug/1944621/+attachment/5528491/+files/lp1944621.debdiff

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Title:
  sshd in chroot has regression with glibc 2.34

Status in openssh package in Ubuntu:
  Confirmed

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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