Make integrity tests more robust against timeouts in the case where the first test in a series for a given MAC happens to modify the low bytes of a packet length.

1 files changed, 57 insertions, 0 deletions

diff --git a/debian/patches/regress-integrity-robust.patch b/debian/patches/regress-integrity-robust.patch
new file mode 100644
index 000000000..92b5ae5fc
--- /dev/null
+++ b/debian/patches/regress-integrity-robust.patch
@@ -0,0 +1,57 @@
+From ada7edd8b4ec246a0c1c283c5e5956f09d503fbd Mon Sep 17 00:00:00 2001
+From: Colin Watson <cjwatson@debian.org>
+Date: Sun, 1 Jan 2017 15:21:10 +0000
+Subject: Make integrity tests more robust against timeouts
+
+If the first test in a series for a given MAC happens to modify the low
+bytes of a packet length, then ssh will time out and this will be
+interpreted as a test failure.  Handle this failure mode.
+
+Bug: https://bugzilla.mindrot.org/show_bug.cgi?id=2658
+Patch-Name: regress-integrity-robust.patch
+
+Last-Update: 2017-01-01
+---
+ regress/integrity.sh | 9 +++++----
+ 1 file changed, 5 insertions(+), 4 deletions(-)
+
+diff --git a/regress/integrity.sh b/regress/integrity.sh
+index 39d310de..fd7d58bc 100644
+--- a/regress/integrity.sh
++++ b/regress/integrity.sh
+@@ -5,8 +5,6 @@ tid="integrity"
+ cp $OBJ/sshd_proxy $OBJ/sshd_proxy_bak
+ 
+ # start at byte 2900 (i.e. after kex) and corrupt at different offsets
+-# XXX the test hangs if we modify the low bytes of the packet length
+-# XXX and ssh tries to read...
+ tries=10
+ startoffset=2900
+ macs=`${SSH} -Q mac`
+@@ -27,6 +25,7 @@ for m in $macs; do
+        elen=0
+        epad=0
+        emac=0
++       etmo=0
+        ecnt=0
+        skip=0
+        for off in `jot $tries $startoffset`; do
+@@ -61,14 +60,16 @@ for m in $macs; do
+                Corrupted?MAC* | *message?authentication?code?incorrect*)
+                                emac=`expr $emac + 1`; skip=0;;
+                padding*)       epad=`expr $epad + 1`; skip=0;;
++               *Timeout,?server*)
++                               etmo=`expr $etmo + 1`; skip=0;;
+                *)              fail "unexpected error mac $m at $off: $out";;
+                esac
+        done
+-       verbose "test $tid: $ecnt errors: mac $emac padding $epad length $elen"
++       verbose "test $tid: $ecnt errors: mac $emac padding $epad length $elen timeout $etmo"
+        if [ $emac -eq 0 ]; then
+                fail "$m: no mac errors"
+        fi
+-       expect=`expr $ecnt - $epad - $elen`
++       expect=`expr $ecnt - $epad - $elen - $etmo`
+        if [ $emac -ne $expect ]; then
+                fail "$m: expected $expect mac errors, got $emac"
+        fi