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improve fuse-fuzzer

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ed 2020-08-13 04:43:13 +00:00
parent b6a3c52d67
commit 765af31b83
1 changed files with 28 additions and 33 deletions
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61
scripts/fusefuzz.py
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@ -1,6 +1,7 @@
#!/usr/bin/env python3 #!/usr/bin/env python3
import os import os
import time
""" """
mkdir -p /dev/shm/fusefuzz/{r,v} mkdir -p /dev/shm/fusefuzz/{r,v}
@ -10,15 +11,36 @@ PYTHONPATH=.. python3 -m copyparty -v /dev/shm/fusefuzz/r::r -i 127.0.0.1
""" """
def chk(fsz, rsz, ofs0, shift, ofs, rf, vf):
if ofs != rf.tell():
rf.seek(ofs)
vf.seek(ofs)
rb = rf.read(rsz)
vb = vf.read(rsz)
print(f"fsz {fsz} rsz {rsz} ofs {ofs0} shift {shift} ofs {ofs} = {len(rb)}")
if rb != vb:
for n, buf in enumerate([rb, vb]):
with open("buf." + str(n), "wb") as f:
f.write(buf)
raise Exception(f"{len(rb)} != {len(vb)}")
return rb, vb
def main(): def main():
v = "v" v = "v"
for n in range(5): for n in range(5):
with open(f"r/{n}", "wb") as f: with open(f"r/{n}", "wb") as f:
f.write(b"h" * n) f.write(b"h" * n)
rand = os.urandom(7919) # prime
for fsz in range(1024 * 1024 * 2 - 3, 1024 * 1024 * 2 + 3): for fsz in range(1024 * 1024 * 2 - 3, 1024 * 1024 * 2 + 3):
with open("r/f", "wb", fsz) as f: with open("r/f", "wb", fsz) as f:
f.write(b"\xab" * fsz) f.write((rand * int(fsz / len(rand) + 1))[:fsz])
for rsz in range(64 * 1024 - 2, 64 * 1024 + 2): for rsz in range(64 * 1024 - 2, 64 * 1024 + 2):
ofslist = [0, 1, 2] ofslist = [0, 1, 2]
@ -48,19 +70,7 @@ def main():
prev_ofs = ofs prev_ofs = ofs
if ofs != rf.tell(): rb, vb = chk(fsz, rsz, ofs0, shift, ofs, rf, vf)
rf.seek(ofs)
vf.seek(ofs)
rb = rf.read(rsz)
vb = vf.read(rsz)
print(
f"fsz {fsz} rsz {rsz} ofs {ofs0} shift {shift} ofs {ofs} = {len(rb)}"
)
if rb != vb:
raise Exception(f"{len(rb)} != {len(vb)}")
if not rb: if not rb:
break break
@ -78,28 +88,13 @@ def main():
if ofs < 0 or ofs > fsz: if ofs < 0 or ofs > fsz:
break break
if ofs != rf.tell(): rb, vb = chk(fsz, rsz, ofs0, shift, ofs, rf, vf)
rf.seek(ofs)
vf.seek(ofs)
rb = rf.read(rsz)
vb = vf.read(rsz)
print(
f"fsz {fsz} rsz {rsz} ofs {ofs0} shift {shift} ofs {ofs} = {len(rb)}"
)
if rb != vb:
raise Exception(f"{len(rb)} != {len(vb)}")
ofs -= rsz ofs -= rsz
# bumping fsz, sleep away the dentry cache in cppf
time.sleep(1)
if __name__ == "__main__": if __name__ == "__main__":
main() main()
"""
f() { cat virt/{1,2,AAAAAAAAAAAAA}; echo; dd if=virt/f bs=${1} | cmp r/f; }
901120
"""