[Bug 2049552] Re: [noble] ftbfs with new zlib 1.3

[Colin Watson]

You could probably just merge current Debian openssh rather than trying
to fix all these problems independently?

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Title:
  [noble] ftbfs with new zlib 1.3

Status in openssh package in Ubuntu:
  In Progress

Bug description:
  The zlib detection code seems faulty:

  checking for possibly buggy zlib... yes
  configure: error: *** zlib too old - check config.log ***
  Your reported zlib version has known security problems.  It's possible your
  vendor has fixed these problems without changing the version number.  If you
  are sure this is the case, you can disable the check by running
  "./configure --without-zlib-version-check".
  If you are in doubt, upgrade zlib to version 1.2.3 or greater.
  See http://www.gzip.org/zlib/ for details.

  | #include <stdio.h>
  | #include <stdlib.h>
  | #include <zlib.h>
  |
  | int
  | main (void)
  | {
  |
  |   int a=0, b=0, c=0, d=0, n, v;
  |   n = sscanf(ZLIB_VERSION, "%d.%d.%d.%d", &a, &b, &c, &d);
  |   if (n != 3 && n != 4)
  |       exit(1);
  |   v = a*1000000 + b*10000 + c*100 + d;
  |   fprintf(stderr, "found zlib version %s (%d)\n", ZLIB_VERSION, v);
  |
  |   /* 1.1.4 is OK */
  |   if (a == 1 && b == 1 && c >= 4)
  |       exit(0);
  |
  |   /* 1.2.3 and up are OK */
  |   if (v >= 1020300)
  |       exit(0);
  |
  |   exit(2);
  |
  |   ;
  |   return 0;
  | }

  Upstream bug report: https://bugzilla.mindrot.org/show_bug.cgi?id=3604

  Upstream fix (untested): https://github.com/openssh/openssh-
  portable/commit/cb4ed12ffc332d1f72d054ed92655b5f1c38f621

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