Date:   Fri, 21 Jun 2019 15:50:54 +0200
From:   Alexander Graf <graf@...zon.com>
To:     Sam Caccavale <samcacc@...zon.de>
CC:     <samcaccavale@...il.com>, <nmanthey@...zon.de>,
        <wipawel@...zon.de>, <dwmw@...zon.co.uk>, <mpohlack@...zon.de>,
        <karahmed@...zon.de>, <andrew.cooper3@...rix.com>,
        <JBeulich@...e.com>, <pbonzini@...hat.com>, <rkrcmar@...hat.com>,
        <tglx@...utronix.de>, <mingo@...hat.com>, <bp@...en8.de>,
        <hpa@...or.com>, <paullangton4@...il.com>,
        <anirudhkaushik@...gle.com>, <x86@...nel.org>,
        <kvm@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [v2, 4/4] Added scripts for filtering, building, deploying



On 12.06.19 17:36, Sam Caccavale wrote:
> bin.sh produces output which diagnoses whether the crash was expected.
> coalesce.sh, gen_output.sh, and summarize.sh are useful for parsing
> the large crash directories that afl produces.
> deploy_remote.sh does all of the setup to launch a fuzz run via
> install_deps_ubuntu.sh, install_afl.sh, build.sh, and run.sh.
> rebuild.sh cleans the directories and executes build.sh
> ---
>   tools/fuzz/x86ie/scripts/afl-many             |  6 +--
>   tools/fuzz/x86ie/scripts/bin.sh               | 49 +++++++++++++++++++
>   tools/fuzz/x86ie/scripts/build.sh             | 32 ++++++++++++
>   tools/fuzz/x86ie/scripts/coalesce.sh          |  6 +++
>   tools/fuzz/x86ie/scripts/deploy.sh            |  9 ++++
>   tools/fuzz/x86ie/scripts/deploy_remote.sh     |  9 ++++
>   tools/fuzz/x86ie/scripts/gen_output.sh        | 11 +++++
>   tools/fuzz/x86ie/scripts/install_afl.sh       | 14 ++++++
>   .../fuzz/x86ie/scripts/install_deps_ubuntu.sh |  5 ++
>   tools/fuzz/x86ie/scripts/rebuild.sh           |  6 +++
>   tools/fuzz/x86ie/scripts/run.sh               | 10 ++++
>   tools/fuzz/x86ie/scripts/summarize.sh         |  9 ++++
>   12 files changed, 163 insertions(+), 3 deletions(-)
>   create mode 100755 tools/fuzz/x86ie/scripts/bin.sh
>   create mode 100755 tools/fuzz/x86ie/scripts/build.sh
>   create mode 100755 tools/fuzz/x86ie/scripts/coalesce.sh
>   create mode 100644 tools/fuzz/x86ie/scripts/deploy.sh
>   create mode 100755 tools/fuzz/x86ie/scripts/deploy_remote.sh
>   create mode 100755 tools/fuzz/x86ie/scripts/gen_output.sh
>   create mode 100755 tools/fuzz/x86ie/scripts/install_afl.sh
>   create mode 100755 tools/fuzz/x86ie/scripts/install_deps_ubuntu.sh
>   create mode 100755 tools/fuzz/x86ie/scripts/rebuild.sh
>   create mode 100755 tools/fuzz/x86ie/scripts/run.sh
>   create mode 100755 tools/fuzz/x86ie/scripts/summarize.sh
> 
> diff --git a/tools/fuzz/x86ie/scripts/afl-many b/tools/fuzz/x86ie/scripts/afl-many
> index ab15258573a2..3fe6423309a6 100755
> --- a/tools/fuzz/x86ie/scripts/afl-many
> +++ b/tools/fuzz/x86ie/scripts/afl-many
> @@ -19,10 +19,10 @@ while [ -z "$sync_dir" ]; do
>   done
> 
>   for i in $(seq 1 $(( ${NPROC:-$(nproc)} - 1)) ); do
> -    taskset -c "$i" ./afl-fuzz -S "slave$i" $@ >/dev/null 2>&1 &
> +    taskset -c "$i" $AFLPATH/afl-fuzz -S "slave$i" $@ >/dev/null 2>&1 &
>   done
> -taskset -c 0 ./afl-fuzz -M master $@ >/dev/null 2>&1 &
> +taskset -c 0 $AFLPATH/afl-fuzz -M master $@ >/dev/null 2>&1 &
> 
>   sleep 5
> -watch -n1 "echo \"Executing './afl-fuzz $@' on ${NPROC:-$(nproc)} cores.\" && ./afl-whatsup -s ${sync_dir}"
> +watch -n1 "echo \"Executing 'AFLPATH/afl-fuzz $@' on ${NPROC:-$(nproc)} cores.\" && $AFLPATH/afl-whatsup -s 

This is missing a $ sign.

${sync_dir}"
>   pkill afl-fuzz
> diff --git a/tools/fuzz/x86ie/scripts/bin.sh b/tools/fuzz/x86ie/scripts/bin.sh
> new file mode 100755
> index 000000000000..6383a883ff33
> --- /dev/null
> +++ b/tools/fuzz/x86ie/scripts/bin.sh
> @@ -0,0 +1,49 @@
> +#!/bin/bash
> +# SPDX-License-Identifier: GPL-2.0+
> +
> +if [ "$#" -lt 3 ]; then
> +  echo "Usage: './bin path/to/afl-harness path/to/afl_crash [path/to/linux/src/root]'"
> +  exit
> +fi
> +
> +export AFL_HARNESS="$1"
> +export LINUX_SRC="$3"
> +
> +diagnose_segfault() {
> +  SOURCE=$(gdb -batch -ex r -ex 'bt 2' --args $@ 2>&1 | grep -Po '#1.* \K([^ ]+:[0-9]+)');
> +  IFS=: read FILE LINE <<< "$SOURCE"
> +
> +  OP="$(sed -n "${LINE}p" "$LINUX_SRC/$FILE" 2>/dev/null)"
> +  if [ $? -ne 0 ]; then
> +    OP="$(sed -n "${LINE}p" "$LINUX_SRC/tools/fuzz/x86_instruction_emulation/$FILE" 2>/dev/null)"
> +  fi
> +
> +  OP="$(echo $OP | grep -Po 'ops->\K([^(]+)')"
> +  if [ -z "$OP" ]; then
> +    echo "SEGV: unknown, in $FILE:$LINE"
> +  else
> +    echo "Expected: segfaulting on emulator->$OP"
> +  fi
> +}
> +export -f diagnose_segfault
> +
> +bin() {
> +  OUTPUT=$(bash -c "timeout 1s $AFL_HARNESS $1 2>&1" 2>&1)
> +  RETVAL=$?
> +
> +  echo "$OUTPUT"
> +  if [ $RETVAL -eq 0 ]; then
> +    echo "Terminated successfully"
> +  elif [ $RETVAL -eq 124 ]; then
> +    echo "Unknown: killed due to timeout.  Loop likely."
> +  elif echo "$OUTPUT" | grep -q "SEGV"; then
> +    echo "$(diagnose_segfault $AFL_HARNESS $1)"
> +  elif echo "$OUTPUT" | grep -q "FPE"; then
> +    echo "Expected: floating point exception."
> +  else
> +    echo "Unknown cause of crash."
> +  fi
> +}
> +export -f bin
> +
> +echo "$(bin $2 2>&1)"
> diff --git a/tools/fuzz/x86ie/scripts/build.sh b/tools/fuzz/x86ie/scripts/build.sh
> new file mode 100755
> index 000000000000..74b893f222c1
> --- /dev/null
> +++ b/tools/fuzz/x86ie/scripts/build.sh
> @@ -0,0 +1,32 @@
> +#!/bin/bash
> +# SPDX-License-Identifier: GPL-2.0+
> +
> +kernel_objects="arch/x86/kvm/emulate.o arch/x86/lib/retpoline.o lib/find_bit.o"
> +
> +disable() { sed -i -r "/\b$1\b/c\# $1" .config; }
> +enable() { sed -i -r "/\b$1\b/c\\$1=y" .config; }
> +
> +make ${CC:+ "CC=$CC"} ${DEBUG:+ "DEBUG=1"} defconfig
> +
> +enable "CONFIG_DEBUG_INFO"
> +enable "CONFIG_STACKPROTECTOR"
> +
> +yes ' ' | make ${CC:+ "CC=$CC"} ${DEBUG:+ "DEBUG=1"} $kernel_objects
> +
> +omit_arg () { args=$(echo "$args" | sed "s/ $1//g"); }
> +add_arg () { args+=" $1"; }
> +
> +rebuild () {
> +  args="$(head -1 $(dirname $1)/.$(basename $1).cmd | sed -e 's/.*:= //g')"
> +  omit_arg "-mcmodel=kernel"
> +  omit_arg "-mpreferred-stack-boundary=3"
> +  add_arg "-fsanitize=address"
> +  echo -e "Rebuilding $1 with \n$args"
> +  eval "$args"
> +}
> +
> +for object in $kernel_objects; do
> +  rebuild $object
> +done
> +
> +make ${CC:+ "CC=$CC"} ${DEBUG:+ "DEBUG=1"} tools/fuzz
> diff --git a/tools/fuzz/x86ie/scripts/coalesce.sh b/tools/fuzz/x86ie/scripts/coalesce.sh
> new file mode 100755
> index 000000000000..18c2ca7f2767
> --- /dev/null
> +++ b/tools/fuzz/x86ie/scripts/coalesce.sh
> @@ -0,0 +1,6 @@
> +#!/bin/bash
> +# SPDX-License-Identifier: GPL-2.0+
> +
> +mkdir -p all
> +rm -rf all/*
> +find . -type f -wholename '*crashes/id*' | parallel cp {} ./all/$(basename $(dirname {//})):{/}
> diff --git a/tools/fuzz/x86ie/scripts/deploy.sh b/tools/fuzz/x86ie/scripts/deploy.sh
> new file mode 100644
> index 000000000000..f95c3aa2b5b5
> --- /dev/null
> +++ b/tools/fuzz/x86ie/scripts/deploy.sh
> @@ -0,0 +1,9 @@
> +#!/bin/bash
> +# SPDX-License-Identifier: GPL-2.0+
> +
> +REMOTE=$1
> +DSTDIR=/dev/shm
> +
> +rsync -av $(pwd) $REMOTE:$DSTDIR
> +
> +ssh $REMOTE "cd $DSTDIR/$(basename $(pwd)); bash -s tools/fuzz/x86_instruction_emulation/scripts/deploy_remote.sh"

Does this really belong in here?

> diff --git a/tools/fuzz/x86ie/scripts/deploy_remote.sh b/tools/fuzz/x86ie/scripts/deploy_remote.sh
> new file mode 100755
> index 000000000000..e002c5a932f5
> --- /dev/null
> +++ b/tools/fuzz/x86ie/scripts/deploy_remote.sh
> @@ -0,0 +1,9 @@
> +#!/bin/bash
> +# SPDX-License-Identifier: GPL-2.0+
> +
> +SCRIPTDIR=$(pwd)/tools/fuzz/x86_instruction_emulation/scripts
> +
> +$SCRIPTDIR/install_deps_ubuntu.sh
> +source $SCRIPTDIR/install_afl.sh
> +CC=$AFLPATH/afl-gcc $SCRIPTDIR/build.sh
> +FUZZDIR="${FUZZDIR:-$(pwd)/fuzz}" $SCRIPTDIR/run.sh
> diff --git a/tools/fuzz/x86ie/scripts/gen_output.sh b/tools/fuzz/x86ie/scripts/gen_output.sh
> new file mode 100755
> index 000000000000..6c0707eb6d08
> --- /dev/null
> +++ b/tools/fuzz/x86ie/scripts/gen_output.sh
> @@ -0,0 +1,11 @@
> +#!/bin/bash
> +# SPDX-License-Identifier: GPL-2.0+
> +
> +if [ "$#" -lt 3 ]; then
> +  echo "Usage: '$0 path/to/afl-harness path/to/afl_crash_dir path/to/linux/src/root'"
> +  exit
> +fi
> +
> +mkdir -p output
> +rm -rf output/*
> +find $2 -type f | parallel ./bin.sh $1 {} $3 '>' ./output/{/}.out
> diff --git a/tools/fuzz/x86ie/scripts/install_afl.sh b/tools/fuzz/x86ie/scripts/install_afl.sh
> new file mode 100755
> index 000000000000..b1c5612eca1c
> --- /dev/null
> +++ b/tools/fuzz/x86ie/scripts/install_afl.sh
> @@ -0,0 +1,14 @@
> +#!/bin/bash
> +# SPDX-License-Identifier: GPL-2.0+
> +
> +wget http://lcamtuf.coredump.cx/afl/releases/afl-latest.tgz
> +mkdir -p afl
> +tar xzf afl-latest.tgz -C afl --strip-components 1
> +
> +pushd afl
> +set AFL_USE_ASAN
> +make clean all
> +export AFLPATH="$(pwd)"
> +popd
> +
> +sudo bash -c "echo core >/proc/sys/kernel/core_pattern"
> diff --git a/tools/fuzz/x86ie/scripts/install_deps_ubuntu.sh b/tools/fuzz/x86ie/scripts/install_deps_ubuntu.sh
> new file mode 100755
> index 000000000000..5525bc8b659c
> --- /dev/null
> +++ b/tools/fuzz/x86ie/scripts/install_deps_ubuntu.sh
> @@ -0,0 +1,5 @@
> +#!/bin/bash
> +# SPDX-License-Identifier: GPL-2.0+
> +
> +sudo apt update
> +sudo apt install -y make gcc wget screen build-essential libssh-dev flex bison libelf-dev bc

Same as this. This file could bitrot really quick. And it doesn't help 
any non-Ubuntu users.


I think most files in here are not strictly needed. Maybe split this 
patch into one that actually contains all changes necessary to easily 
start a test run and a separate one with all your convencience scripts?


Alex

> diff --git a/tools/fuzz/x86ie/scripts/rebuild.sh b/tools/fuzz/x86ie/scripts/rebuild.sh
> new file mode 100755
> index 000000000000..ecdc5aa52653
> --- /dev/null
> +++ b/tools/fuzz/x86ie/scripts/rebuild.sh
> @@ -0,0 +1,6 @@
> +#!/bin/bash
> +# SPDX-License-Identifier: GPL-2.0+
> +
> +make clean
> +make tools/fuzz_clean
> +FUZZDIR="./fuzz" ./tools/fuzz/x86_instruction_emulation/scripts/build.sh
> diff --git a/tools/fuzz/x86ie/scripts/run.sh b/tools/fuzz/x86ie/scripts/run.sh
> new file mode 100755
> index 000000000000..9b7d69e0f0f6
> --- /dev/null
> +++ b/tools/fuzz/x86ie/scripts/run.sh
> @@ -0,0 +1,10 @@
> +#!/bin/bash
> +# SPDX-License-Identifier: GPL-2.0+
> +
> +FUZZDIR="${FUZZDIR:-$(pwd)/fuzz}"
> +
> +mkdir -p $FUZZDIR/in
> +cp tools/fuzz/x86_instruction_emulation/rand_sample.bin $FUZZDIR/in
> +mkdir -p $FUZZDIR/out
> +
> +screen bash -c "ulimit -Sv $[21999999999 << 10]; ./tools/fuzz/x86_instruction_emulation/scripts/afl-many -m 22000000000 -i $FUZZDIR/in -o $FUZZDIR/out tools/fuzz/x86_instruction_emulation/afl-harness @@"
> diff --git a/tools/fuzz/x86ie/scripts/summarize.sh b/tools/fuzz/x86ie/scripts/summarize.sh
> new file mode 100755
> index 000000000000..27761f283ee3
> --- /dev/null
> +++ b/tools/fuzz/x86ie/scripts/summarize.sh
> @@ -0,0 +1,9 @@
> +#!/bin/bash
> +# SPDX-License-Identifier: GPL-2.0+
> +
> +if [ "$#" -lt 1 ]; then
> +  echo "Usage: '$0 path/to/output/dir'"
> +  exit
> +fi
> +
> +time bash -c "find $1 -type f -exec tail -n 1 {} \; | sort | uniq -c | sort -rn"
> --
> 2.17.1
> 

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