From 1ea84bebeaafd4bd22fe021ebef94e7eeb424804 Mon Sep 17 00:00:00 2001
From: Jesse Luehrs <doy@tozt.net>
Date: Wed, 2 Dec 2020 04:26:15 -0500
Subject: fix glibc linkage on debian again

---
 bin/remove-glibc-2.29-use | 118 ----------------------------------------------
 1 file changed, 118 deletions(-)
 delete mode 100755 bin/remove-glibc-2.29-use

(limited to 'bin')

diff --git a/bin/remove-glibc-2.29-use b/bin/remove-glibc-2.29-use
deleted file mode 100755
index c23b7a6..0000000
--- a/bin/remove-glibc-2.29-use
+++ /dev/null
@@ -1,118 +0,0 @@
-#!/usr/bin/env perl
-use strict;
-use warnings;
-use 5.020;
-use experimental 'signatures';
-no warnings 'experimental::signatures';
-
-# see http://www.lightofdawn.org/wiki/wiki.cgi/NewAppsOnOldGlibc for details
-
-# as of currently, only `log2` is being used from GLIBC_2.29, and a
-# corresponding version from GLIBC_2.2.5 does exist, so we can just swap it
-# out.
-
-my $bin = $ARGV[0];
-
-system("readelf -s $bin | grep -q GLIBC_2.29");
-if ($?) {
-    die "no symbols from GLIBC_2.29 found, skipping\n";
-}
-
-my %readelf_v = parse_readelf_v($bin);
-my %readelf_s = parse_readelf_s($bin);
-
-if ($readelf_s{'log2@GLIBC_2.29'}{ver} != $readelf_v{'.gnu.version_r'}{'libm.so.6'}{'GLIBC_2.29'}{ver}) {
-    die "log2 doesn't appear to use the symbol version from GLIBC_2.29\n";
-}
-
-my $bin_contents = do {
-    local $/;
-    open my $bin_fh, '<', $bin or die "couldn't open $bin: $!";
-    <$bin_fh>
-};
-
-my $gnu_version_r_offset = $readelf_v{'.gnu.version_r'}{offset};
-my $glibc_229_offset = $gnu_version_r_offset + $readelf_v{'.gnu.version_r'}{'libm.so.6'}{'GLIBC_2.29'}{offset};
-my $glibc_225_offset = $gnu_version_r_offset + $readelf_v{'.gnu.version_r'}{'libm.so.6'}{'GLIBC_2.2.5'}{offset};
-
-# we could just make the GLIBC_2.29 symbol weak (as described in the above
-# page), but that causes a warning to be printed every time you run the binary,
-# which is obnoxious
-
-# use constant VER_FLG_WEAK => 0x02;
-# my $prev_glibc_229_flags = substr $bin_contents, $glibc_229_offset + 0x04, 2, pack('s', VER_FLG_WEAK);
-# if (unpack('s', $prev_glibc_229_flags) != 0) {
-#     die "GLIBC_2.29 did not have flags set to 0\n";
-# }
-
-# instead, we overwrite vna_hash, vna_flags, vna_other, vna_name with the 2.2.5
-# versions (but leave vna_next the same) - this causes there to be two entries
-# describing GLIBC_2.2.5, but this appears to be harmless
-substr($bin_contents, $glibc_229_offset + 0x00, 12, substr($bin_contents, $glibc_225_offset + 0x00, 12));
-
-my $gnu_version_offset = $readelf_v{'.gnu.version'}{offset};
-my $log2_offset = $gnu_version_offset + 2 * $readelf_s{'log2@GLIBC_2.29'}{num};
-
-my $prev_log2_version = substr $bin_contents, $log2_offset, 2, pack('s', $readelf_v{'.gnu.version_r'}{'libm.so.6'}{'GLIBC_2.2.5'}{ver});
-if (unpack('s', $prev_log2_version) != $readelf_v{'.gnu.version_r'}{'libm.so.6'}{'GLIBC_2.29'}{ver}) {
-    die "log2 doesn't appear to use the symbol version from GLIBC_2.29\n";
-}
-
-open my $fh, '>', "$bin.new" or die "couldn't open $bin.new: $!";
-print $fh $bin_contents;
-chmod 0755, "$bin.new";
-
-my $remaining = `readelf -s $bin.new | grep GLIBC_2.29`;
-if (!$?) {
-    die "additional symbols from GLIBC_2.29 found:\n$remaining\n";
-}
-
-sub parse_readelf_s($bin) {
-    my $readelf = `readelf -s $bin`;
-
-    my %ret;
-    for my $line (split "\n", $readelf) {
-        if ($line =~ /^ *[0-9]+:/) {
-            my ($num, $value, $size, $type, $bind, $vis, $ndx, $name, $ver) = split ' ', $line;
-            if (defined $ver) {
-                ($ver) = $ver =~ /\((.*)\)/;
-            }
-            if (defined $num) {
-                ($num) = $num =~ /(.*):/;
-            }
-            $ret{$name} = {
-                num => $num,
-                ver => $ver,
-            }
-        }
-    }
-
-    %ret
-}
-
-sub parse_readelf_v($bin) {
-    my $readelf = `readelf -V $bin`;
-
-    my $section;
-    my $file;
-    my %ret;
-    for my $line (split "\n", $readelf) {
-        if ($line =~ /^Version (?:symbols|needs) section '([^']+)'/) {
-            $section = $1;
-        }
-        if ($line =~ /^ Addr: (?:[^ ]+)  Offset: ([^ ]+)/) {
-            $ret{$section}{offset} = hex($1);
-        }
-        if ($line =~ /^  [^:]+: Version: [^ ]+  File: ([^ ]+)/) {
-            $file = $1;
-        }
-        if ($line =~ /^  ([^:]+):   Name: ([^ ]+)  Flags: (?:[^ ]+)  Version: (.*)/) {
-            $ret{$section}{$file}{$2} = {
-                offset => hex($1),
-                ver => $3,
-            };
-        }
-    }
-
-    %ret
-}
-- 
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