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#! /usr/libexec/platform-python
#===- lib/hwasan/scripts/hwasan_symbolize ----------------------------------===#
#
# Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
# See https:#llvm.org/LICENSE.txt for license information.
# SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
#
#===------------------------------------------------------------------------===#
#
# HWAddressSanitizer offline symbolization script.
#
#===------------------------------------------------------------------------===#
import glob
import os
import re
import sys
import string
import subprocess
import argparse
last_access_address = None
last_access_tag = None
class Symbolizer:
def __init__(self, path, binary_prefixes, paths_to_cut):
self.__pipe = None
self.__path = path
self.__binary_prefixes = binary_prefixes
self.__paths_to_cut = paths_to_cut
self.__log = False
self.__warnings = set()
def enable_logging(self, enable):
self.__log = enable
def __open_pipe(self):
if not self.__pipe:
self.__pipe = subprocess.Popen([self.__path, "-inlining", "-functions"],
stdin=subprocess.PIPE, stdout=subprocess.PIPE)
class __EOF:
pass
def __write(self, s):
print >>self.__pipe.stdin, s
if self.__log:
print >>sys.stderr, ("#>> |%s|" % (s,))
def __read(self):
s = self.__pipe.stdout.readline().rstrip()
if self.__log:
print >>sys.stderr, ("# << |%s|" % (s,))
if s == '':
raise Symbolizer.__EOF
return s
def __process_source_path(self, file_name):
for path_to_cut in self.__paths_to_cut:
file_name = re.sub(".*" + path_to_cut, "", file_name)
file_name = re.sub(".*hwasan_[a-z_]*.(cc|h):[0-9]*", "[hwasan_rtl]", file_name)
file_name = re.sub(".*asan_[a-z_]*.(cc|h):[0-9]*", "[asan_rtl]", file_name)
file_name = re.sub(".*crtstuff.c:0", "???:0", file_name)
return file_name
def __process_binary_name(self, name):
if name.startswith('/'):
name = name[1:]
for p in self.__binary_prefixes:
full_path = os.path.join(p, name)
if os.path.exists(full_path):
return full_path
# Try stripping extra path components as the last resort.
for p in self.__binary_prefixes:
full_path = os.path.join(p, os.path.basename(name))
if os.path.exists(full_path):
return full_path
if name not in self.__warnings:
print >>sys.stderr, "Could not find symbols for", name
self.__warnings.add(name)
return None
def iter_locals(self, binary, addr):
self.__open_pipe()
p = self.__pipe
binary = self.__process_binary_name(binary)
if not binary:
return
self.__write("FRAME %s %s" % (binary, addr))
try:
while True:
function_name = self.__read()
local_name = self.__read()
file_line = self.__read()
extra = self.__read().split()
file_line = self.__process_source_path(file_line)
offset = None if extra[0] == '??' else int(extra[0])
size = None if extra[1] == '??' else int(extra[1])
tag_offset = None if extra[2] == '??' else int(extra[2])
yield (function_name, file_line, local_name, offset, size, tag_offset)
except Symbolizer.__EOF:
pass
def iter_call_stack(self, binary, addr):
self.__open_pipe()
p = self.__pipe
binary = self.__process_binary_name(binary)
if not binary:
return
self.__write("CODE %s %s" % (binary, addr))
try:
while True:
function_name = self.__read()
file_line = self.__read()
file_line = self.__process_source_path(file_line)
yield (function_name, file_line)
except Symbolizer.__EOF:
pass
def symbolize_line(line, symbolizer_path):
#0 0x7f6e35cf2e45 (/blah/foo.so+0x11fe45)
match = re.match(r'^(.*?)#([0-9]+)( *)(0x[0-9a-f]*) *\((.*)\+(0x[0-9a-f]+)\)', line, re.UNICODE)
if match:
frameno = match.group(2)
binary = match.group(5)
addr = int(match.group(6), 16)
frames = list(symbolizer.iter_call_stack(binary, addr))
if len(frames) > 0:
print "%s#%s%s%s in %s" % (match.group(1).encode('utf-8'), match.group(2).encode('utf-8'),
match.group(3).encode('utf-8'), frames[0][0], frames[0][1])
for i in range(1, len(frames)):
space1 = ' ' * match.end(1)
space2 = ' ' * (match.start(4) - match.end(1) - 2)
print "%s->%s%s in %s" % (space1, space2, frames[i][0], frames[i][1])
else:
print line.rstrip().encode('utf-8')
else:
print line.rstrip().encode('utf-8')
def save_access_address(line):
global last_access_address, last_access_tag
match = re.match(r'^(.*?)HWAddressSanitizer: tag-mismatch on address (0x[0-9a-f]+) ', line, re.UNICODE)
if match:
last_access_address = int(match.group(2), 16)
match = re.match(r'^(.*?) of size [0-9]+ at 0x[0-9a-f]* tags: ([0-9a-f]+)/[0-9a-f]+ \(ptr/mem\)', line, re.UNICODE)
if match:
last_access_tag = int(match.group(2), 16)
def process_stack_history(line, symbolizer, ignore_tags=False):
if last_access_address is None or last_access_tag is None:
return
if re.match(r'Previously allocated frames:', line, re.UNICODE):
return True
pc_mask = (1 << 48) - 1
fp_mask = (1 << 20) - 1
# record_addr:0x1234ABCD record:0x1234ABCD (/path/to/binary+0x1234ABCD)
match = re.match(r'^(.*?)record_addr:(0x[0-9a-f]+) +record:(0x[0-9a-f]+) +\((.*)\+(0x[0-9a-f]+)\)', line, re.UNICODE)
if match:
record_addr = int(match.group(2), 16)
record = int(match.group(3), 16)
binary = match.group(4)
addr = int(match.group(5), 16)
base_tag = (record_addr >> 3) & 0xFF
fp = (record >> 48) << 4
pc = record & pc_mask
for local in symbolizer.iter_locals(binary, addr):
frame_offset = local[3]
size = local[4]
if frame_offset is None or size is None:
continue
obj_offset = (last_access_address - fp - frame_offset) & fp_mask
if obj_offset >= size:
continue
tag_offset = local[5]
if not ignore_tags and (tag_offset is None or base_tag ^ tag_offset != last_access_tag):
continue
print ''
print 'Potentially referenced stack object:'
print ' %d bytes inside variable "%s" in stack frame of function "%s"' % (obj_offset, local[2], local[0])
print ' at %s' % (local[1],)
return True
return False
parser = argparse.ArgumentParser()
parser.add_argument('-d', action='store_true')
parser.add_argument('-v', action='store_true')
parser.add_argument('--ignore-tags', action='store_true')
parser.add_argument('--symbols', action='append')
parser.add_argument('--source', action='append')
parser.add_argument('--symbolizer')
parser.add_argument('args', nargs=argparse.REMAINDER)
args = parser.parse_args()
# Unstripped binaries location.
binary_prefixes = args.symbols or []
if not binary_prefixes:
if 'ANDROID_PRODUCT_OUT' in os.environ:
product_out = os.path.join(os.environ['ANDROID_PRODUCT_OUT'], 'symbols')
binary_prefixes.append(product_out)
for p in binary_prefixes:
if not os.path.isdir(p):
print >>sys.stderr, "Symbols path does not exist or is not a directory:", p
sys.exit(1)
# Source location.
paths_to_cut = args.source or []
if not paths_to_cut:
paths_to_cut.append(os.getcwd() + '/')
if 'ANDROID_BUILD_TOP' in os.environ:
paths_to_cut.append(os.environ['ANDROID_BUILD_TOP'] + '/')
# llvm-symbolizer binary.
# 1. --symbolizer flag
# 2. environment variable
# 3. unsuffixed binary in the current directory
# 4. if inside Android platform, prebuilt binary at a known path
# 5. first "llvm-symbolizer", then "llvm-symbolizer-$VER" with the
# highest available version in $PATH
symbolizer_path = args.symbolizer
if not symbolizer_path:
if 'LLVM_SYMBOLIZER_PATH' in os.environ:
symbolizer_path = os.environ['LLVM_SYMBOLIZER_PATH']
elif 'HWASAN_SYMBOLIZER_PATH' in os.environ:
symbolizer_path = os.environ['HWASAN_SYMBOLIZER_PATH']
if not symbolizer_path:
s = os.path.join(os.path.dirname(sys.argv[0]), 'llvm-symbolizer')
if os.path.exists(s):
symbolizer_path = s
if not symbolizer_path:
if 'ANDROID_BUILD_TOP' in os.environ:
s = os.path.join(os.environ['ANDROID_BUILD_TOP'], 'prebuilts/clang/host/linux-x86/llvm-binutils-stable/llvm-symbolizer')
if os.path.exists(s):
symbolizer_path = s
if not symbolizer_path:
for path in os.environ["PATH"].split(os.pathsep):
p = os.path.join(path, 'llvm-symbolizer')
if os.path.exists(p):
symbolizer_path = p
break
def extract_version(s):
idx = s.rfind('-')
if idx == -1:
return 0
x = float(s[idx + 1:])
return x
if not symbolizer_path:
for path in os.environ["PATH"].split(os.pathsep):
candidates = glob.glob(os.path.join(path, 'llvm-symbolizer-*'))
if len(candidates) > 0:
candidates.sort(key = extract_version, reverse = True)
symbolizer_path = candidates[0]
break
if not os.path.exists(symbolizer_path):
print >>sys.stderr, "Symbolizer path does not exist:", symbolizer_path
sys.exit(1)
if args.v:
print "Looking for symbols in:"
for s in binary_prefixes:
print " %s" % (s,)
print "Stripping source path prefixes:"
for s in paths_to_cut:
print " %s" % (s,)
print "Using llvm-symbolizer binary in:\n %s" % (symbolizer_path,)
print
symbolizer = Symbolizer(symbolizer_path, binary_prefixes, paths_to_cut)
symbolizer.enable_logging(args.d)
for line in sys.stdin:
line = line.decode('utf-8')
save_access_address(line)
if process_stack_history(line, symbolizer, ignore_tags=args.ignore_tags):
continue
symbolize_line(line, symbolizer_path)