Merge branch 'uname' of github.com:dnschneid/crouton

chekeychen · Jul 9, 2021 · 10728f0 · 10728f0
2 parents 0b82cd5 + eba51ad
commit 10728f0
Showing 1 changed file with 18 additions and 0 deletions.
diff --git a/installer/ubuntu/prepare b/installer/ubuntu/prepare
@@ -225,6 +225,24 @@ export DEBIAN_FRONTEND=noninteractive
 echo exit 101 > /usr/sbin/policy-rc.d
 chmod +x /usr/sbin/policy-rc.d
 
+# Debian glibc won't install on kernel revisions >=255, so add a wrapper script
+# to clamp the revision number. Without also patching the uname syscalls,
+# glibc's version math will overflow, resulting in an increased minor version
+# number and possibly in glibc trying to use unavailable syscalls or features.
+if [ ! -e /bin/uname.bin -a ! -e /usr/bin/uname.bin ]; then
+    for uname in /bin/uname /usr/bin/uname; do
+        # We don't use --rename since /bin may be a temp symlink to /usr/bin.
+        # --no-rename doesn't exist on old dpkg, but --rename will become the
+        # default in the future, so we have to try both with and without.
+        dpkg-divert --divert "$uname.bin" --no-rename "$uname" 2>/dev/null \
+            || dpkg-divert --divert "$uname.bin" "$uname"
+        mv -f "$uname" "$uname.bin" 2>/dev/null || true
+    done
+    echo '#!/bin/sh -eu
+uname.bin "$@" | sed '\''s/\.\(25[5-9]\|2[6-9][0-9]\|[3-9][0-9][0-9]\)-/.254-/g'\' > /bin/uname
+    chmod +x /bin/uname
+fi
+
 # Run debootstrap second stage if it hasn't already happened
 if [ -r /debootstrap ]; then
     # Debootstrap doesn't like anything mounted under /sys or /var when it runs