547f574fd9
Here's a patch updating the meaning of TAINT_CPU_OUT_OF_SPEC after
Borislav introduced changes in a7e1f67ed2 and upcoming patches in tip.
TAINT_CPU_OUT_OF_SPEC now means a bit more what it implies as the
flag isn't set just because of a CPU misconfiguration or mismatch.
Historically it was for SMP kernel oops on an officially SMP incapable
processor but now it also covers CPUs whose MSRs have been incorrectly
poked at from userspace, drivers being used on non supported
architectures, broken firmware, mismatched CPUs, ...
Update documentation and script to reflect that.
Signed-off-by: Mathieu Chouquet-Stringer <me@mathieu.digital>
Link: https://lore.kernel.org/r/20201202153244.709752-1-me@mathieu.digital
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
203 lines
3.6 KiB
Bash
Executable File
203 lines
3.6 KiB
Bash
Executable File
#! /bin/sh
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# SPDX-License-Identifier: GPL-2.0
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#
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# Randy Dunlap <rdunlap@infradead.org>, 2018
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# Thorsten Leemhuis <linux@leemhuis.info>, 2018
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usage()
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{
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cat <<EOF
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usage: ${0##*/}
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${0##*/} <int>
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Call without parameters to decode /proc/sys/kernel/tainted.
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Call with a positive integer as parameter to decode a value you
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retrieved from /proc/sys/kernel/tainted on another system.
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EOF
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}
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if [ "$1"x != "x" ]; then
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if [ "$1"x == "--helpx" ] || [ "$1"x == "-hx" ] ; then
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usage
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exit 1
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elif [ $1 -ge 0 ] 2>/dev/null ; then
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taint=$1
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else
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echo "Error: Parameter '$1' not a positive interger. Aborting." >&2
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exit 1
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fi
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else
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TAINTFILE="/proc/sys/kernel/tainted"
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if [ ! -r $TAINTFILE ]; then
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echo "No file: $TAINTFILE"
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exit
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fi
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taint=`cat $TAINTFILE`
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fi
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if [ $taint -eq 0 ]; then
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echo "Kernel not Tainted"
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exit
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else
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echo "Kernel is \"tainted\" for the following reasons:"
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fi
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T=$taint
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out=
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addout() {
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out=$out$1
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}
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if [ `expr $T % 2` -eq 0 ]; then
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addout "G"
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else
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addout "P"
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echo " * proprietary module was loaded (#0)"
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fi
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T=`expr $T / 2`
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if [ `expr $T % 2` -eq 0 ]; then
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addout " "
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else
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addout "F"
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echo " * module was force loaded (#1)"
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fi
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T=`expr $T / 2`
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if [ `expr $T % 2` -eq 0 ]; then
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addout " "
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else
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addout "S"
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echo " * kernel running on an out of specification system (#2)"
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fi
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T=`expr $T / 2`
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if [ `expr $T % 2` -eq 0 ]; then
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addout " "
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else
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addout "R"
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echo " * module was force unloaded (#3)"
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fi
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T=`expr $T / 2`
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if [ `expr $T % 2` -eq 0 ]; then
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addout " "
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else
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addout "M"
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echo " * processor reported a Machine Check Exception (MCE) (#4)"
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fi
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T=`expr $T / 2`
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if [ `expr $T % 2` -eq 0 ]; then
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addout " "
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else
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addout "B"
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echo " * bad page referenced or some unexpected page flags (#5)"
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fi
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T=`expr $T / 2`
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if [ `expr $T % 2` -eq 0 ]; then
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addout " "
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else
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addout "U"
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echo " * taint requested by userspace application (#6)"
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fi
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T=`expr $T / 2`
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if [ `expr $T % 2` -eq 0 ]; then
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addout " "
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else
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addout "D"
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echo " * kernel died recently, i.e. there was an OOPS or BUG (#7)"
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fi
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T=`expr $T / 2`
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if [ `expr $T % 2` -eq 0 ]; then
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addout " "
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else
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addout "A"
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echo " * an ACPI table was overridden by user (#8)"
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fi
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T=`expr $T / 2`
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if [ `expr $T % 2` -eq 0 ]; then
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addout " "
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else
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addout "W"
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echo " * kernel issued warning (#9)"
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fi
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T=`expr $T / 2`
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if [ `expr $T % 2` -eq 0 ]; then
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addout " "
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else
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addout "C"
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echo " * staging driver was loaded (#10)"
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fi
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T=`expr $T / 2`
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if [ `expr $T % 2` -eq 0 ]; then
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addout " "
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else
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addout "I"
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echo " * workaround for bug in platform firmware applied (#11)"
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fi
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T=`expr $T / 2`
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if [ `expr $T % 2` -eq 0 ]; then
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addout " "
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else
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addout "O"
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echo " * externally-built ('out-of-tree') module was loaded (#12)"
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fi
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T=`expr $T / 2`
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if [ `expr $T % 2` -eq 0 ]; then
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addout " "
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else
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addout "E"
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echo " * unsigned module was loaded (#13)"
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fi
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T=`expr $T / 2`
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if [ `expr $T % 2` -eq 0 ]; then
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addout " "
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else
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addout "L"
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echo " * soft lockup occurred (#14)"
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fi
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T=`expr $T / 2`
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if [ `expr $T % 2` -eq 0 ]; then
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addout " "
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else
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addout "K"
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echo " * kernel has been live patched (#15)"
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fi
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T=`expr $T / 2`
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if [ `expr $T % 2` -eq 0 ]; then
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addout " "
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else
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addout "X"
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echo " * auxiliary taint, defined for and used by distros (#16)"
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fi
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T=`expr $T / 2`
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if [ `expr $T % 2` -eq 0 ]; then
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addout " "
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else
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addout "T"
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echo " * kernel was built with the struct randomization plugin (#17)"
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fi
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echo "For a more detailed explanation of the various taint flags see"
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echo " Documentation/admin-guide/tainted-kernels.rst in the the Linux kernel sources"
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echo " or https://kernel.org/doc/html/latest/admin-guide/tainted-kernels.html"
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echo "Raw taint value as int/string: $taint/'$out'"
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#EOF#
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