1#! /bin/sh
2# SPDX-License-Identifier: GPL-2.0
3#
4# Randy Dunlap <rdunlap@infradead.org>, 2018
5# Thorsten Leemhuis <linux@leemhuis.info>, 2018
6
7usage()
8{
9	cat <<EOF
10usage: ${0##*/}
11       ${0##*/} <int>
12
13Call without parameters to decode /proc/sys/kernel/tainted.
14
15Call with a positive integer as parameter to decode a value you
16retrieved from /proc/sys/kernel/tainted on another system.
17
18EOF
19}
20
21if [ "$1"x != "x" ]; then
22	if  [ "$1"x == "--helpx" ] || [ "$1"x == "-hx" ] ; then
23		usage
24		exit 1
25	elif  [ $1 -ge 0 ] 2>/dev/null ; then
26		taint=$1
27	else
28		echo "Error: Parameter '$1' not a positive interger. Aborting." >&2
29		exit 1
30	fi
31else
32	TAINTFILE="/proc/sys/kernel/tainted"
33	if [ ! -r $TAINTFILE ]; then
34		echo "No file: $TAINTFILE"
35		exit
36	fi
37
38	taint=`cat $TAINTFILE`
39fi
40
41if [ $taint -eq 0 ]; then
42	echo "Kernel not Tainted"
43	exit
44else
45	echo "Kernel is \"tainted\" for the following reasons:"
46fi
47
48T=$taint
49out=
50
51addout() {
52	out=$out$1
53}
54
55if [ `expr $T % 2` -eq 0 ]; then
56	addout "G"
57else
58	addout "P"
59	echo " * proprietary module was loaded (#0)"
60fi
61
62T=`expr $T / 2`
63if [ `expr $T % 2` -eq 0 ]; then
64	addout " "
65else
66	addout "F"
67	echo " * module was force loaded (#1)"
68fi
69
70T=`expr $T / 2`
71if [ `expr $T % 2` -eq 0 ]; then
72	addout " "
73else
74	addout "S"
75	echo " * kernel running on an out of specification system (#2)"
76fi
77
78T=`expr $T / 2`
79if [ `expr $T % 2` -eq 0 ]; then
80	addout " "
81else
82	addout "R"
83	echo " * module was force unloaded (#3)"
84fi
85
86T=`expr $T / 2`
87if [ `expr $T % 2` -eq 0 ]; then
88	addout " "
89else
90	addout "M"
91	echo " * processor reported a Machine Check Exception (MCE) (#4)"
92fi
93
94T=`expr $T / 2`
95if [ `expr $T % 2` -eq 0 ]; then
96	addout " "
97else
98	addout "B"
99	echo " * bad page referenced or some unexpected page flags (#5)"
100fi
101
102T=`expr $T / 2`
103if [ `expr $T % 2` -eq 0 ]; then
104	addout " "
105else
106	addout "U"
107	echo " * taint requested by userspace application (#6)"
108fi
109
110T=`expr $T / 2`
111if [ `expr $T % 2` -eq 0 ]; then
112	addout " "
113else
114	addout "D"
115	echo " * kernel died recently, i.e. there was an OOPS or BUG (#7)"
116fi
117
118T=`expr $T / 2`
119if [ `expr $T % 2` -eq 0 ]; then
120	addout " "
121else
122	addout "A"
123	echo " * an ACPI table was overridden by user (#8)"
124fi
125
126T=`expr $T / 2`
127if [ `expr $T % 2` -eq 0 ]; then
128	addout " "
129else
130	addout "W"
131	echo " * kernel issued warning (#9)"
132fi
133
134T=`expr $T / 2`
135if [ `expr $T % 2` -eq 0 ]; then
136	addout " "
137else
138	addout "C"
139	echo " * staging driver was loaded (#10)"
140fi
141
142T=`expr $T / 2`
143if [ `expr $T % 2` -eq 0 ]; then
144	addout " "
145else
146	addout "I"
147	echo " * workaround for bug in platform firmware applied (#11)"
148fi
149
150T=`expr $T / 2`
151if [ `expr $T % 2` -eq 0 ]; then
152	addout " "
153else
154	addout "O"
155	echo " * externally-built ('out-of-tree') module was loaded  (#12)"
156fi
157
158T=`expr $T / 2`
159if [ `expr $T % 2` -eq 0 ]; then
160	addout " "
161else
162	addout "E"
163	echo " * unsigned module was loaded (#13)"
164fi
165
166T=`expr $T / 2`
167if [ `expr $T % 2` -eq 0 ]; then
168	addout " "
169else
170	addout "L"
171	echo " * soft lockup occurred (#14)"
172fi
173
174T=`expr $T / 2`
175if [ `expr $T % 2` -eq 0 ]; then
176	addout " "
177else
178	addout "K"
179	echo " * kernel has been live patched (#15)"
180fi
181
182T=`expr $T / 2`
183if [ `expr $T % 2` -eq 0 ]; then
184	addout " "
185else
186	addout "X"
187	echo " * auxiliary taint, defined for and used by distros (#16)"
188
189fi
190T=`expr $T / 2`
191if [ `expr $T % 2` -eq 0 ]; then
192	addout " "
193else
194	addout "T"
195	echo " * kernel was built with the struct randomization plugin (#17)"
196fi
197
198echo "For a more detailed explanation of the various taint flags see"
199echo " Documentation/admin-guide/tainted-kernels.rst in the the Linux kernel sources"
200echo " or https://kernel.org/doc/html/latest/admin-guide/tainted-kernels.html"
201echo "Raw taint value as int/string: $taint/'$out'"
202#EOF#
203