#!/usr/bin/env bash
# -*- coding: utf-8 -*-
#
# dissector_fuzz.sh -- fuzz test netsniff-ng's dissector and pcap io methods
#		       with shitty pcap example files from the Wireshark archive
#
# Copyright (C) 2012 Daniel Borkmann <borkmann@redhat.com>
# Copyright (C) 2012 Stefan Seering <sseerin@imn.htwk-leipzig.de>
#
# Note: build and *install* the toolkit first before running this script!
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License version 2 as
# published by the Free Software Foundation.

set -u

if [ ${BASH_VERSINFO} -lt 3 ] ; then
	echo 'Error: Your bash need to be version 3 or newer. Exiting.'
	exit 1 # operators like =~ produce errors silently in old bash versions, so exit here
fi

archive='ftp://wireshark.org/automated/captures/'
show_output='' # empty string evaluates to false
run_through='' # empty string evaluates to false
count_cores=0
count_files=0
netsniff_ng_opts=''

if [ $# -gt 0 ] ; then
	if [ "$1" = '-h' -o "$1" = '--help' -o "$1" = '--usage' ] ; then
		echo 'Usage: dissector_fuzz [-s (show netsniff-ng output, default: no)] [-r (keep running on errors, default: no)] [netsniff-ng long-args]'
		exit 0
	fi

	for opt in $@ ; do
		if [ "${opt}" = '-s' ] ; then
			show_output='true'
		elif [ "${opt}" = '-r' ] ; then
			run_through='true'
		else
			netsniff_ng_opts="${netsniff_ng_opts} ${opt}";
		fi
	done
fi

mkdir -p fuzzing
cd fuzzing
wget -r -Nc -np -nd -A.pcap "$archive"  |& grep -E "%|^--"
ulimit -c unlimited
rm -f core
for file in *.pcap
do
	echo "Testing file $file ..."
	if [ $show_output ]; then
		netsniff-ng --in "$file" "${netsniff_ng_opts}"
	else
		netsniff-ng --in "$file" "${netsniff_ng_opts}" > /dev/null
	fi
	if [ -e core ]; then
		echo "Fuck, core dumped on $file!"
		let count_cores=count_cores+1
		if [ $run_through ]; then
			rm core
		else
			exit
		fi
	fi
done

if which cowsay > /dev/null ; then
	echo_cmd='cowsay'
else
	echo_cmd='echo'
fi

${echo_cmd} 'Your fuckup Score'
echo " * tested pcaps: $count_files"
echo " * core dumps:   $count_cores"
 method='get' action='/cgit.cgi/linux/net-next.git/log/tools/arch'>
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<option value='grep'>log msg</option>
<option value='author'>author</option>
<option value='committer'>committer</option>
<option value='range'>range</option>
</select>
<input class='txt' type='search' size='10' name='q' value=''/>
<input type='submit' value='search'/>
</form>
</td></tr></table>
<div class='path'>path: <a href='/cgit.cgi/linux/net-next.git/commit/?id=3895dbf8985f656675b5bde610723a29cbce3fa7'>root</a>/<a href='/cgit.cgi/linux/net-next.git/commit/tools?id=3895dbf8985f656675b5bde610723a29cbce3fa7'>tools</a>/<a href='/cgit.cgi/linux/net-next.git/commit/tools/arch?id=3895dbf8985f656675b5bde610723a29cbce3fa7'>arch</a></div><div class='content'><div class='cgit-panel'><b>diff options</b><form method='get'><input type='hidden' name='id' value='3895dbf8985f656675b5bde610723a29cbce3fa7'/><table><tr><td colspan='2'/></tr><tr><td class='label'>context:</td><td class='ctrl'><select name='context' onchange='this.form.submit();'><option value='1'>1</option><option value='2'>2</option><option value='3' selected='selected'>3</option><option value='4'>4</option><option value='5'>5</option><option value='6'>6</option><option value='7'>7</option><option value='8'>8</option><option value='9'>9</option><option value='10'>10</option><option value='15'>15</option><option value='20'>20</option><option value='25'>25</option><option value='30'>30</option><option value='35'>35</option><option value='40'>40</option></select></td></tr><tr><td class='label'>space:</td><td class='ctrl'><select name='ignorews' onchange='this.form.submit();'><option value='0' selected='selected'>include</option><option value='1'>ignore</option></select></td></tr><tr><td class='label'>mode:</td><td class='ctrl'><select name='dt' onchange='this.form.submit();'><option value='0' selected='selected'>unified</option><option value='1'>ssdiff</option><option value='2'>stat only</option></select></td></tr><tr><td/><td class='ctrl'><noscript><input type='submit' value='reload'/></noscript></td></tr></table></form></div><table summary='commit info' class='commit-info'>
<tr><th>author</th><td>Eric W. Biederman &lt;ebiederm@xmission.com&gt;</td><td class='right'>2017-01-03 14:18:43 +1300</td></tr>
<tr><th>committer</th><td>Eric W. Biederman &lt;ebiederm@xmission.com&gt;</td><td class='right'>2017-01-10 13:34:43 +1300</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/tools/arch?id=3895dbf8985f656675b5bde610723a29cbce3fa7'>3895dbf8985f656675b5bde610723a29cbce3fa7</a> (<a href='/cgit.cgi/linux/net-next.git/patch/tools/arch?id=3895dbf8985f656675b5bde610723a29cbce3fa7'>patch</a>)</td></tr>
<tr><th>tree</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/tree/?id=3895dbf8985f656675b5bde610723a29cbce3fa7'>91d4517f09918fd573998eb40b8f35f08ed1c470</a> /<a href='/cgit.cgi/linux/net-next.git/tree/tools/arch?id=3895dbf8985f656675b5bde610723a29cbce3fa7'>tools/arch</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/tools/arch?id=0c744ea4f77d72b3dcebb7a8f2684633ec79be88'>0c744ea4f77d72b3dcebb7a8f2684633ec79be88</a> (<a href='/cgit.cgi/linux/net-next.git/diff/tools/arch?id=3895dbf8985f656675b5bde610723a29cbce3fa7&amp;id2=0c744ea4f77d72b3dcebb7a8f2684633ec79be88'>diff</a>)</td></tr></table>
<div class='commit-subject'>mnt: Protect the mountpoint hashtable with mount_lock</div><div class='commit-msg'>Protecting the mountpoint hashtable with namespace_sem was sufficient
until a call to umount_mnt was added to mntput_no_expire.  At which
point it became possible for multiple calls of put_mountpoint on
the same hash chain to happen on the same time.

Kristen Johansen &lt;kjlx@templeofstupid.com&gt; reported:
&gt; This can cause a panic when simultaneous callers of put_mountpoint
&gt; attempt to free the same mountpoint.  This occurs because some callers
&gt; hold the mount_hash_lock, while others hold the namespace lock.  Some
&gt; even hold both.
&gt;
&gt; In this submitter's case, the panic manifested itself as a GP fault in
&gt; put_mountpoint() when it called hlist_del() and attempted to dereference
&gt; a m_hash.pprev that had been poisioned by another thread.

Al Viro observed that the simple fix is to switch from using the namespace_sem
to the mount_lock to protect the mountpoint hash table.

I have taken Al's suggested patch moved put_mountpoint in pivot_root
(instead of taking mount_lock an additional time), and have replaced
new_mountpoint with get_mountpoint a function that does the hash table
lookup and addition under the mount_lock.   The introduction of get_mounptoint
ensures that only the mount_lock is needed to manipulate the mountpoint
hashtable.

d_set_mounted is modified to only set DCACHE_MOUNTED if it is not
already set.  This allows get_mountpoint to use the setting of
DCACHE_MOUNTED to ensure adding a struct mountpoint for a dentry
happens exactly once.

Cc: stable@vger.kernel.org
Fixes: ce07d891a089 ("mnt: Honor MNT_LOCKED when detaching mounts")
Reported-by: Krister Johansen &lt;kjlx@templeofstupid.com&gt;
Suggested-by: Al Viro &lt;viro@ZenIV.linux.org.uk&gt;
Acked-by: Al Viro &lt;viro@ZenIV.linux.org.uk&gt;
Signed-off-by: "Eric W. Biederman" &lt;ebiederm@xmission.com&gt;
</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?id=3895dbf8985f656675b5bde610723a29cbce3fa7'>Diffstat</a> (limited to 'tools/arch')</div><table summary='diffstat' class='diffstat'>