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tools: add a kernel-chktaint to tools/debugging
Add a script to the tools/ directory that shows if or why the running kernel was tainted. The script was mostly written by Randy Dunlap; I enhanced the script a bit. There does not appear to be a good home for this script. so create tools/debugging for tools of this nature. Signed-off-by: Randy Dunlap <rdunlap@infradead.org> Signed-off-by: Thorsten Leemhuis <linux@leemhuis.info> [ jc: fixed conflicts, rewrote changelog ] Signed-off-by: Jonathan Corbet <corbet@lwn.net>
This commit is contained in:
Thorsten Leemhuis
Jonathan Corbet
parent
8fe28cb58b
commit
4ab5a5d2a4
@ -12,6 +12,7 @@ help:
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@echo ' acpi - ACPI tools'
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@echo ' cgroup - cgroup tools'
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@echo ' cpupower - a tool for all things x86 CPU power'
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@echo ' debugging - tools for debugging'
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@echo ' firewire - the userspace part of nosy, an IEEE-1394 traffic sniffer'
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@echo ' freefall - laptop accelerometer program for disk protection'
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@echo ' gpio - GPIO tools'
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@ -60,7 +61,7 @@ acpi: FORCE
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cpupower: FORCE
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$(call descend,power/$@)
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cgroup firewire hv guest spi usb virtio vm bpf iio gpio objtool leds wmi pci: FORCE
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cgroup firewire hv guest spi usb virtio vm bpf iio gpio objtool leds wmi pci debugging: FORCE
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$(call descend,$@)
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liblockdep: FORCE
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@ -95,7 +96,8 @@ kvm_stat: FORCE
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all: acpi cgroup cpupower gpio hv firewire liblockdep \
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perf selftests spi turbostat usb \
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virtio vm bpf x86_energy_perf_policy \
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tmon freefall iio objtool kvm_stat wmi pci
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tmon freefall iio objtool kvm_stat wmi \
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pci debugging
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acpi_install:
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$(call descend,power/$(@:_install=),install)
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@ -103,7 +105,7 @@ acpi_install:
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cpupower_install:
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$(call descend,power/$(@:_install=),install)
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cgroup_install firewire_install gpio_install hv_install iio_install perf_install spi_install usb_install virtio_install vm_install bpf_install objtool_install wmi_install pci_install:
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cgroup_install firewire_install gpio_install hv_install iio_install perf_install spi_install usb_install virtio_install vm_install bpf_install objtool_install wmi_install pci_install debugging_install:
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$(call descend,$(@:_install=),install)
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liblockdep_install:
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@ -129,7 +131,7 @@ install: acpi_install cgroup_install cpupower_install gpio_install \
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perf_install selftests_install turbostat_install usb_install \
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virtio_install vm_install bpf_install x86_energy_perf_policy_install \
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tmon_install freefall_install objtool_install kvm_stat_install \
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wmi_install pci_install
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wmi_install pci_install debugging_install
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acpi_clean:
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$(call descend,power/acpi,clean)
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@ -137,7 +139,7 @@ acpi_clean:
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cpupower_clean:
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$(call descend,power/cpupower,clean)
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cgroup_clean hv_clean firewire_clean spi_clean usb_clean virtio_clean vm_clean wmi_clean bpf_clean iio_clean gpio_clean objtool_clean leds_clean pci_clean:
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cgroup_clean hv_clean firewire_clean spi_clean usb_clean virtio_clean vm_clean wmi_clean bpf_clean iio_clean gpio_clean objtool_clean leds_clean pci_clean debugging_clean:
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$(call descend,$(@:_clean=),clean)
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liblockdep_clean:
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@ -175,6 +177,6 @@ clean: acpi_clean cgroup_clean cpupower_clean hv_clean firewire_clean \
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perf_clean selftests_clean turbostat_clean spi_clean usb_clean virtio_clean \
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vm_clean bpf_clean iio_clean x86_energy_perf_policy_clean tmon_clean \
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freefall_clean build_clean libbpf_clean libsubcmd_clean liblockdep_clean \
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gpio_clean objtool_clean leds_clean wmi_clean pci_clean
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gpio_clean objtool_clean leds_clean wmi_clean pci_clean debugging_clean
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.PHONY: FORCE
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16
tools/debugging/Makefile
Normal file
16
tools/debugging/Makefile
Normal file
@ -0,0 +1,16 @@
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# SPDX-License-Identifier: GPL-2.0
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# Makefile for debugging tools
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PREFIX ?= /usr
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BINDIR ?= bin
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INSTALL ?= install
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TARGET = kernel-chktaint
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all: $(TARGET)
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clean:
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install: kernel-chktaint
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$(INSTALL) -D -m 755 $(TARGET) $(DESTDIR)$(PREFIX)/$(BINDIR)/$(TARGET)
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202
tools/debugging/kernel-chktaint
Executable file
202
tools/debugging/kernel-chktaint
Executable file
@ -0,0 +1,202 @@
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#! /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 " * SMP kernel oops on an officially SMP incapable processor (#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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