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lvi-mitigation.py
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lvi-mitigation.py
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#
# Copyright (C) 2020 Intel Corporation. All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
#
# * Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
# * Redistributions in binary form must reproduce the above copyright
# notice, this list of conditions and the following disclaimer in
# the documentation and/or other materials provided with the
# distribution.
# * Neither the name of Intel Corporation nor the names of its
# contributors may be used to endorse or promote products derived
# from this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#
#
import sys
import os
import re
import shutil
import random
LOCK = "lock"
REP = "rep[a-z]*"
REX = "rex(?:\.[a-zA-Z]+)?"
SCALAR = "(?:(?:[+-]\s*)?(?:[0-9][0-9a-fA-F]*|0x[0-9a-fA-F]+))"
IMMEDIATE = "(?:%s[hb]?)" %(SCALAR)
REG = "(?:%[a-zA-Z][a-zA-Z0-9]*)"
SYM = "(?:[_a-zA-Z][_a-zA-Z0-9]*(?:@[0-9a-zA-Z]+)?)"
LABEL = "(?:[._a-zA-Z0-9]+)"
SEP = "(?:(?:^|:)\s*)"
PFX = "(?:%s\s+)?" %(REX)
CONST = "(?:(?:%s|%s|%s)(?:\s*[/*+-]\s*(?:%s|%s|%s))*)" %(SYM, SCALAR, LABEL, SYM, SCALAR, LABEL)
OFFSET = "(?:%s|%s|%s\s*:\s*(?:%s|%s|))" %(CONST, SYM, REG, CONST, SYM)
MEMORYOP = "(?:(?:\(*%s*\)*)*\(%s\s*(?:,\s*%s*\s*,\s*%s*\s*)*\))" %(CONST, REG, REG, CONST)
MEMORYOP = "(?:(?:\(*%s\)*)*\(%s\s*(?:,\s*%s*\s*,\s*%s*\s*)*\))" %(CONST, REG, REG, CONST)
ANYOP = "(?:%s|%s|%s|%s|%s)" %(MEMORYOP, IMMEDIATE, REG, SYM, LABEL)
MEMORYSRC = "(?:%s,\s*)" %(MEMORYOP)
MEMORYANY = "(?:%s,\s*)%s*(?:\s*,\s*%s)*" % (MEMORYOP, ANYOP, ANYOP)
ATTSTAR = "\*"
LFENCE = [
"(?:%s%smov(?:[a-rt-z][a-z0-9]*)?\s+%s)" %(SEP, PFX, MEMORYSRC),
"(?:%s%s(?:vpmask|mask|c|v|p|vp)mov[a-z0-9]*\s+%s)" %(SEP, PFX, MEMORYSRC),
"(?:%s%spop[bswlqt]?\s+(?:%s|%s))" %(SEP, PFX, MEMORYOP, REG),
"(?:%s%spopad?\s+%s\s*)" %(SEP, PFX, REG),
"(?:%s%s(?:%s\s+)?xchg[a-z]*\s+%s)" %(SEP, PFX, LOCK, MEMORYANY),
"(?:%s%s(?:%s\s+)?(?:x|p|vp|ph|h|pm|)add[a-z]*\s+%s)" %(SEP, PFX, LOCK, MEMORYANY),
"(?:%s%s(?:%s\s+)?(?:p|vp|ph|h|)sub[a-z]*\s+%s)" %(SEP, PFX, LOCK, MEMORYANY),
"(?:%s%s(?:%s\s+)?ad[co]x?[a-z]*\s+%s)" %(SEP, PFX, LOCK, MEMORYANY),
"(?:%s%s(?:%s\s+)?sbb[a-z]*\s+%s)" %(SEP, PFX, LOCK, MEMORYANY),
"(?:%s%s(?:%s\s+)?(?:p|)cmp(?:[a-rt-z][a-z0-9]*)?\s+%s)" %(SEP, PFX, LOCK, MEMORYANY),
"(?:%s%s(?:%s\s+)?inc[a-z]*\s+%s)" %(SEP, PFX, LOCK, MEMORYANY),
"(?:%s%s(?:%s\s+)?dec[a-z]*\s+%s)" %(SEP, PFX, LOCK, MEMORYANY),
"(?:%s%s(?:%s\s+)?not[a-z]*\s+%s)" %(SEP, PFX, LOCK, MEMORYANY),
"(?:%s%s(?:%s\s+)?neg[a-z]*\s+%s)" %(SEP, PFX, LOCK, MEMORYANY),
"(?:%s%s(?:i|v|p|vp|)mul[a-z]*\s+%s)" %(SEP, PFX, MEMORYANY),
"(?:%s%s(?:i|v|p|vp|)div[a-z]*\s+%s)" %(SEP, PFX, MEMORYANY),
"(?:%s%spopcnt[a-z]*\s+%s)" %(SEP, PFX, MEMORYSRC),
"(?:%s%scrc32[a-z]*\s+%s)" %(SEP, PFX, MEMORYANY),
"(?:%s%s(?:%s\s+)?v?p?and[a-z]*\s+%s)" %(SEP, PFX, LOCK, MEMORYANY),
"(?:%s%s(?:%s\s+)?v?p?or[a-z]*\s+%s)" %(SEP, PFX, LOCK, MEMORYANY),
"(?:%s%s(?:%s\s+)?v?p?xor[a-z]*\s+%s)" %(SEP, PFX, LOCK, MEMORYANY),
"(?:%s%sv?p?test[a-z]*\s+%s)" %(SEP, PFX, MEMORYANY),
"(?:%s%ss[ah][lr][a-z]*\s+%s)" %(SEP, PFX, MEMORYANY),
"(?:%s%ssar[a-z]*\s+%s)" %(SEP, PFX, MEMORYANY),
"(?:%s%sro(?:r|l)[a-z]*\s+%s)" %(SEP, PFX, MEMORYANY),
"(?:%s%src(?:r|l)[a-z]*\s+%s)" %(SEP, PFX, MEMORYANY),
"(?:%s%s(?:%s\s+)?bt[a-z]*\s+%s)" %(SEP, PFX, LOCK, MEMORYANY),
"(?:%s%sbs[fr][a-z]*\s+%s)" %(SEP, PFX, MEMORYANY),
"(?:%s%s[lt]zcnt[a-z]*\s+%s)" %(SEP, PFX, MEMORYANY),
"(?:%s%sblsi[a-z]*\s+%s)" %(SEP, PFX, MEMORYANY),
"(?:%s%sblsmsk[a-z]*\s+%s)" %(SEP, PFX, MEMORYANY),
"(?:%s%sblsr[a-z]*\s+%s)" %(SEP, PFX, MEMORYANY),
"(?:%s%sbextr[a-z]*\s+%s)" %(SEP, PFX, MEMORYANY),
"(?:%s%sbzhi[a-z]*\s+%s)" %(SEP, PFX, MEMORYANY),
"(?:%s%spdep[a-z]*\s+%s)" %(SEP, PFX, MEMORYSRC),
"(?:%s%spext[a-z]*\s+%s)" %(SEP, PFX, MEMORYSRC),
"(?:%s%s(?:%s\s+)?lods[a-z]*(?:\s+%s|\s*(?:#|$)))" %(SEP, PFX, REP, MEMORYSRC),
"(?:%s%s(?:%s\s+)?scas[a-z]*(?:\s+%s|\s*(?:#|$)))" %(SEP, PFX, REP, MEMORYSRC),
"(?:%s%s(?:%s\s+)?outs[a-z]*(?:\s+%s|\s*(?:#|$)))" %(SEP, PFX, REP, MEMORYSRC),
"(?:%s%s(?:%s\s+)?cmps[a-z]*(?:\s+%s|\s*(?:#|$)))" %(SEP, PFX, REP, MEMORYSRC),
"(?:%s%s(?:%s\s+)?movs[a-z]*(?:\s+%s|\s*(?:#|$)))" %(SEP, PFX, REP, MEMORYSRC),
"(?:%s%slddqu\s+%s)" %(SEP, PFX, MEMORYSRC),
"(?:%s%sv?pack[a-z]*\s+%s)" %(SEP, PFX, MEMORYSRC),
"(?:%s%sv?punpck[a-z]*\s+%s)" %(SEP, PFX, MEMORYSRC),
"(?:%s%sv?pshuf[a-z]*\s+%s)" %(SEP, PFX, MEMORYSRC),
"(?:%s%sv?palign[a-z]*\s+%s)" %(SEP, PFX, MEMORYSRC),
"(?:%s%sv?pblend[a-z]*\s+%s)" %(SEP, PFX, MEMORYSRC),
"(?:%s%svperm[a-z0-9]*\s+%s)" %(SEP, PFX, MEMORYSRC),
"(?:%s%sv?p?insr[a-z]*\s+%s)" %(SEP, PFX, MEMORYSRC),
"(?:%s%svinsert[a-z0-9]*\s+%s)" %(SEP, PFX, MEMORYSRC),
"(?:%s%sv?p?expand[a-z]*\s+%s)" %(SEP, PFX, MEMORYSRC),
"(?:%s%svp?broadcast[a-z0-9]*\s+%s)" %(SEP, PFX, MEMORYANY),
"(?:%s%svp?gather[a-z]*\s+%s)" %(SEP, PFX, MEMORYANY),
"(?:%s%sv?pavg[a-z]*\s+%s)" %(SEP, PFX, MEMORYANY),
"(?:%s%sv?p?min[a-z]*\s+%s)" %(SEP, PFX, MEMORYANY),
"(?:%s%sv?p?max[a-z]*\s+%s)" %(SEP, PFX, MEMORYANY),
"(?:%s%sv?phminpos[a-z]*\s+%s)" %(SEP, PFX, MEMORYANY),
"(?:%s%sv?pabs[a-z]*\s+%s)" %(SEP, PFX, MEMORYANY),
"(?:%s%sv?psign[a-z]*\s+%s)" %(SEP, PFX, MEMORYANY),
"(?:%s%sv?m?psad[a-z]*\s+%s)" %(SEP, PFX, MEMORYANY),
"(?:%s%sv?psll[a-z]*\s+%s)" %(SEP, PFX, MEMORYANY),
"(?:%s%sv?psrl[a-z]*\s+%s)" %(SEP, PFX, MEMORYANY),
"(?:%s%sv?psra[a-z]*\s+%s)" %(SEP, PFX, MEMORYANY),
"(?:%s%sv?pclmulqdq\s+%s)" %(SEP, PFX, MEMORYANY),
"(?:%s%sv?aesdec(?:last)?\s+%s)" %(SEP, PFX, MEMORYANY),
"(?:%s%sv?aesenc(?:last)?\s+%s)" %(SEP, PFX, MEMORYANY),
"(?:%s%sv?aesimc\s+%s)" %(SEP, PFX, MEMORYANY),
"(?:%s%sv?aeskeygenassist\s+%s)" %(SEP, PFX, MEMORYANY),
"(?:%s%sv?sha(?:1|256)(?:nexte|rnds4|msg1|msg2)\s+%s)" %(SEP, PFX, MEMORYSRC),
"(?:%s%sv?cvt[a-z0-9]*\s+%s)" %(SEP, PFX, MEMORYSRC),
"(?:%s%sv?rcp(?:ss|ps)\s+%s)" %(SEP, PFX, MEMORYANY),
"(?:%s%sv?u?comis[sd]\s+%s)" %(SEP, PFX, MEMORYANY),
"(?:%s%sv?round[a-z]*\s+%s)" %(SEP, PFX, MEMORYANY),
"(?:%s%sv?dpp[sd]*\s+%s)" %(SEP, PFX, MEMORYANY),
"(?:%s%sv?r?sqrt[a-z]*\s+%s)" %(SEP, PFX, MEMORYSRC),
"(?:%s%sv?ldmxcsr\s+%s)" %(SEP, PFX, MEMORYOP),
"(?:%s%sf?x?rstors?\s+%s)" %(SEP, PFX, MEMORYOP),
"(?:%s%sl[gi]dt\s+%s)" %(SEP, PFX, MEMORYOP),
"(?:%s%slmsw\s+%s)" %(SEP, PFX, MEMORYANY),
"(?:%s%svmptrld\s+%s)" %(SEP, PFX, MEMORYOP),
"(?:%s%sf(?:b|i|)ld[a-z0-9]*\s+%s)" %(SEP, PFX, MEMORYANY),
"(?:%s%sfi?add[a-z]*\s+%s)" %(SEP, PFX, MEMORYANY),
"(?:%s%sfi?sub[a-z]*\s+%s)" %(SEP, PFX, MEMORYANY),
"(?:%s%sfi?mul[a-z]*\s+%s)" %(SEP, PFX, MEMORYANY),
"(?:%s%sfi?div[a-z]*\s+%s)" %(SEP, PFX, MEMORYANY),
"(?:%s%sf(?:i|u|)com[a-z]*\s+%s)" %(SEP, PFX, MEMORYANY),
]
RET = "(?:%s%sret[a-z]*(?:\s+%s)?(?:#|$))" %(SEP, PFX, IMMEDIATE)
MEM_INDBR = "(?:%s%s(call|jmp)[a-z]*\s+%s%s)" %(SEP, PFX, ATTSTAR, MEMORYOP)
REG_INDBR = "(?:%s%s(call|jmp)[a-z]*\s+%s%s)" %(SEP, PFX, ATTSTAR, REG)
#
# File Operations - read/write
#
def read_file(sfile):
f = open(sfile, 'r')
lines = f.readlines()
f.close()
return lines
def write_file(tfile, lines):
f = open(tfile, 'w')
for line in lines:
f.write(line)
f.close()
return
def insert_lfence(mitigation_level, infile, outfile):
pattern = '|'.join('(?:%s)' % l for l in LFENCE)
lines = read_file(infile)
outputs = lines
for i in range(0, len(lines)):
if lines[i].strip().startswith('#') or lines[i].strip().startswith('.'):
continue
if mitigation_level == 1:
# harden loads
m = re.search(pattern, lines[i])
if m:
j = i
while j > 0:
j = j + 1
if outputs[j].strip() != '':
break
if not outputs[j].strip().startswith('lfence'):
load_mitigation = " lfence\n"
outputs[i] = outputs[i] + load_mitigation
continue
# harden ret
m = re.search(RET, lines[i])
if m:
ret_mitigation = " notq (%rsp)\n notq (%rsp)\n lfence\n"
outputs[i] = ret_mitigation + outputs[i]
elif mitigation_level == 2:
# harden ret
m = re.search(RET, lines[i])
if m:
ret_mitigation = " notq (%rsp)\n notq (%rsp)\n lfence\n"
outputs[i] = ret_mitigation + outputs[i]
continue
# harden indirect branches
m = re.search(REG_INDBR, lines[i])
if m:
j = i
while j > 0:
j = j - 1
if outputs[j].strip() != '':
break
if not outputs[j].split('\n')[-2].strip().startswith('lfence'):
outputs[i] = " lfence\n" + outputs[i]
m = re.search(MEM_INDBR, lines[i])
if m:
print ("Warning: indirect branch with memory operand, line %d" % i)
write_file(outfile, outputs)
def parse_options():
mitigation = 0
options = []
for arg in sys.argv[1:]:
if arg == '-DMITIGATION=FULL':
mitigation = 1
elif arg == '-DMITIGATION=CONTROLFLOW':
mitigation = 2
else:
options.append(arg)
return (mitigation, options)
def get_src_index(options):
src_index = -1
for i in range(0,len(options)):
if options[i] == '-s':
if(src_index != -1):
print ('source files conflict')
exit(-1)
src_index = i+1
if src_index == -1:
print ('cannot find the source file')
exit(-1)
return src_index
def get_dst_index(options):
dst_index = -1
for i in range(0,len(options)):
if options[i] == '-o':
if(dst_index != -1):
print ('target files conflict')
exit(-1)
dst_index = i+1
if dst_index == -1:
print ('cannot find the target file')
exit(-1)
return dst_index
if __name__ == "__main__":
(mitigation, options) = parse_options()
src_index = get_src_index(options)
src_file = options[src_index]
dst_index = get_dst_index(options)
dst_file = options[dst_index]
# insert lfence
insert_lfence(mitigation, src_file, dst_file)