• Home
  • Line#
  • Scopes#
  • Navigate#
  • Raw
  • Download
1#!/bin/sh
2#
3# Copyright (c) 2017 Fujitsu Ltd.
4# Ported: Guangwen Feng <fenggw-fnst@cn.fujitsu.com>
5#
6# This program is free software; you can redistribute it and/or modify
7# it under the terms of the GNU General Public License as published by
8# the Free Software Foundation; either version 2 of the License, or
9# (at your option) any later version.
10#
11# This program is distributed in the hope that it would be useful,
12# but WITHOUT ANY WARRANTY; without even the implied warranty of
13# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14# GNU General Public License for more details.
15#
16# You should have received a copy of the GNU General Public License
17# along with this program, if not, see <http://www.gnu.org/licenses/>.
18#
19# This is a regression test about potential uninitialized variable,
20# the test can crash the buggy kernel, and the bug has been fixed in:
21#
22#   commit 38327424b40bcebe2de92d07312c89360ac9229a
23#   Author: Dan Carpenter <dan.carpenter@oracle.com>
24#   Date:   Thu Jun 16 15:48:57 2016 +0100
25#
26#   KEYS: potential uninitialized variable
27#
28
29TST_SETUP=setup
30TST_CLEANUP=cleanup
31TST_TESTFUNC=do_test
32TST_NEEDS_ROOT=1
33TST_NEEDS_TMPDIR=1
34TST_NEEDS_CMDS="keyctl"
35. tst_test.sh
36
37check_keyctl()
38{
39	local nosup
40	for op in $@; do
41		nosup=0
42
43		if ! keyctl 2>&1 | grep -q "keyctl $op"; then
44			nosup=1
45		fi
46
47		if [ "$op" = "request2" ]; then
48			local key=`keyctl request2 user debug:foo bar`
49			if [ $? -ne 0 ]; then
50				nosup=1
51			fi
52		fi
53
54		if [ "$op" = "unlink" ]; then
55			if ! keyctl unlink $key @s; then
56				nosup=1
57			fi
58		fi
59
60		if [ $nosup -ne 0 ]; then
61			tst_brk TCONF "keyctl operation $op not supported"
62		fi
63	done
64}
65
66setup()
67{
68	check_keyctl negate request2 show unlink
69
70	PATH_KEYSTAT="/proc/key-users"
71	PATH_KEYQUOTA="/proc/sys/kernel/keys/root_maxbytes"
72
73	if [ ! -f "$PATH_KEYSTAT" ] || [ ! -f "$PATH_KEYQUOTA" ]; then
74		tst_brk TCONF "'${PATH_KEYSTAT}' or '${PATH_KEYQUOTA}' \
75			does not exist"
76	fi
77
78	ORIG_KEYSZ=`awk -F' +|/' '/ 0:/ {print $8}' $PATH_KEYSTAT`
79	ORIG_MAXKEYSZ=`cat $PATH_KEYQUOTA`
80}
81
82cleanup()
83{
84	if [ -n "$ORIG_MAXKEYSZ" ]; then
85		echo $ORIG_MAXKEYSZ >$PATH_KEYQUOTA
86	fi
87}
88
89do_test()
90{
91	local quota_excd=0
92	local maxkeysz=$((ORIG_KEYSZ + 100))
93
94	while [ $maxkeysz -ge 0 ]
95	do
96		echo $maxkeysz >$PATH_KEYQUOTA
97
98		keyctl request2 user debug:fred negate @t >temp 2>&1
99		grep -q -E "quota exceeded" temp
100		if [ $? -eq 0 ]; then
101			quota_excd=1
102			break
103		fi
104
105		local key=`keyctl show | awk '/debug:fred/ {print $1}'`
106		if [ -z "$key" ]; then
107			key=`keyctl show | \
108				awk -F ':' '/inaccessible/ {print $1}'`
109		fi
110
111		if [ -n "$key" ]; then
112			keyctl unlink $key @s >/dev/null
113			tst_sleep 50ms
114		fi
115
116		maxkeysz=$((maxkeysz - 4))
117	done
118
119	if [ $quota_excd -eq 0 ]; then
120		tst_res TWARN "Failed to trigger the quota excess"
121	fi
122
123	tst_res TPASS "Bug not reproduced"
124}
125
126tst_run
127