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Enhance eh_frame validity checker/differ

This commit is contained in:
Théophile Bastian 2019-03-31 16:26:55 +02:00
parent 681153b954
commit fc8c9c45d6
2 changed files with 79 additions and 17 deletions
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71
csmith/check_generated_eh_frame.py Normal file → Executable file
View File

@ -5,6 +5,13 @@ class NotFDE(Exception):
pass
def func_name(infos, symtb):
for sym in symtb:
if infos["beg"] == symtb[sym][0]:
return sym
return None
def parse_fde_head(line):
spl = line.strip().split()
assert len(spl) >= 2
@ -59,7 +66,7 @@ def parse_fde(lines):
return {"beg": pc_beg, "end": pc_end, "rows": clean_rows(rows)}
def parse_eh_frame(handle):
def parse_eh_frame(handle, symtb):
output = []
cur_lines = []
for line in handle:
@ -72,7 +79,10 @@ def parse_eh_frame(handle):
if cur_lines != []:
infos = parse_fde(cur_lines)
if infos:
output.append(infos)
symname = func_name(infos, symtb)
if symname not in ["_start", "__libc_csu_init"]:
# These functions have weird instructions
output.append(infos)
cur_lines = []
else:
cur_lines.append(line)
@ -94,13 +104,15 @@ def match_segments(orig_eh, synth_eh):
matches[1][synth_id] = True # PLT -- fake match
continue
if matches[1][synth_id]:
print("Multiple matches (synth)")
# print("Multiple matches (synth)")
pass
if matches[0][orig_id]:
print(
"Multiple matches (orig) {}--{}".format(
hex(orig_fde["beg"]), hex(orig_fde["end"])
)
)
pass
# print(
# "Multiple matches (orig) {}--{}".format(
# hex(orig_fde["beg"]), hex(orig_fde["end"])
# )
# )
else:
matches[0][orig_id] = True
matches[1][synth_id] = True
@ -157,27 +169,52 @@ def match_fde(orig, synth):
):
continue
if cur_val[0] != cur_val[1]:
print("Mis {} ; {}".format(cur_val[0], cur_val[1]))
# print("Mis {} ; {}".format(cur_val[0], cur_val[1]))
return False
return True
def parse_sym_table(handle):
out_map = {}
for line in handle:
line = line.strip()
if line == "===":
break
spl = list(map(lambda x: x.strip(), line.split()))
loc = int(spl[1], 16)
size = int(spl[2])
name = spl[7]
out_map[name] = (loc, size)
return out_map
def main():
orig_eh = parse_eh_frame(sys.stdin)
synth_eh = parse_eh_frame(sys.stdin)
if len(sys.argv) < 2:
print("Missing argument: test_name", file=sys.stderr)
test_name = sys.argv[1]
symtb = parse_sym_table(sys.stdin)
orig_eh = parse_eh_frame(sys.stdin, symtb)
synth_eh = parse_eh_frame(sys.stdin, symtb)
matched, unmatched_orig, unmatched_synth = match_segments(orig_eh, synth_eh)
print(len(matched), len(unmatched_orig), len(unmatched_synth))
dump_light_fdes(unmatched_orig)
print("==")
dump_light_fdes(unmatched_synth)
# dump_light_fdes(unmatched_orig)
# dump_light_fdes(unmatched_synth)
mismatches = 0
for (orig, synth) in matched:
if not match_fde(orig, synth):
print("MISMATCH: {} ; {}".format(fde_pos(orig), fde_pos(synth)))
mismatches += 1
print("TOTAL: {}/{}".format(mismatches, len(matched)))
reports = []
if mismatches > 0:
reports.append("{} mismatches".format(mismatches))
if unmatched_orig:
reports.append("{} unmatched (orig)".format(len(unmatched_orig)))
if unmatched_synth:
reports.append("{} unmatched (synth)".format(len(unmatched_synth)))
if reports:
print("{}: {}".format(test_name, "; ".join(reports)))
if __name__ == "__main__":

25
csmith/check_generated_eh_frame.sh Executable file
View File

@ -0,0 +1,25 @@
#!/bin/bash
USAGE="$0 base_path\nThe base path of eg. 01/01.eh.bin is 01/01"
if [ "$#" -lt 1 ] ; then
>&2 echo -e "Missing argument(s). Usage:\n$USAGE"
exit 1
fi
base_path="$1"
orig_path="$1.orig.bin"
eh_path="$1.eh.bin"
py_checker="$(dirname "$0")/$(basename "$0" ".sh").py"
if ! [ -x "$orig_path" ] || ! [ -x "$eh_path" ]; then
>&2 echo -e "$orig_path or $eh_path does not exist or is not executable"
exit 1
fi
( ( readelf --syms "$orig_path" | grep "FUNC" ) ; \
echo "===" ; \
readelf -wF "$orig_path" ; \
echo "===" ; \
readelf -wF "$eh_path") | python $py_checker "$base_path"