Issue #16408: Fix file descriptors not being closed in error conditions in the zipfile module.
Patch by Serhiy Storchaka.
This commit is contained in:
Antoine Pitrou
parent
115bc79df8
commit
02512fb1cf
398
Lib/zipfile.py
398
Lib/zipfile.py
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@ -718,30 +718,34 @@ class ZipFile(object):
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self.fp = file
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self.filename = getattr(file, 'name', None)
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if key == 'r':
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self._GetContents()
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elif key == 'w':
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# set the modified flag so central directory gets written
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# even if no files are added to the archive
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self._didModify = True
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elif key == 'a':
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try:
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# See if file is a zip file
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try:
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if key == 'r':
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self._RealGetContents()
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# seek to start of directory and overwrite
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self.fp.seek(self.start_dir, 0)
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except BadZipfile:
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# file is not a zip file, just append
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self.fp.seek(0, 2)
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elif key == 'w':
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# set the modified flag so central directory gets written
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# even if no files are added to the archive
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self._didModify = True
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else:
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elif key == 'a':
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try:
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# See if file is a zip file
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self._RealGetContents()
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# seek to start of directory and overwrite
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self.fp.seek(self.start_dir, 0)
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except BadZipfile:
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# file is not a zip file, just append
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self.fp.seek(0, 2)
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# set the modified flag so central directory gets written
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# even if no files are added to the archive
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self._didModify = True
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else:
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raise RuntimeError('Mode must be "r", "w" or "a"')
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except:
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fp = self.fp
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self.fp = None
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if not self._filePassed:
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self.fp.close()
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self.fp = None
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raise RuntimeError, 'Mode must be "r", "w" or "a"'
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fp.close()
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raise
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def __enter__(self):
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return self
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@ -749,17 +753,6 @@ class ZipFile(object):
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def __exit__(self, type, value, traceback):
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self.close()
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def _GetContents(self):
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"""Read the directory, making sure we close the file if the format
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is bad."""
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try:
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self._RealGetContents()
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except BadZipfile:
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if not self._filePassed:
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self.fp.close()
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self.fp = None
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raise
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def _RealGetContents(self):
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"""Read in the table of contents for the ZIP file."""
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fp = self.fp
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@ -853,9 +846,9 @@ class ZipFile(object):
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try:
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# Read by chunks, to avoid an OverflowError or a
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# MemoryError with very large embedded files.
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f = self.open(zinfo.filename, "r")
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while f.read(chunk_size): # Check CRC-32
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pass
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with self.open(zinfo.filename, "r") as f:
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while f.read(chunk_size): # Check CRC-32
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pass
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except BadZipfile:
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return zinfo.filename
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@ -909,60 +902,65 @@ class ZipFile(object):
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zef_file = open(self.filename, 'rb')
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should_close = True
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# Make sure we have an info object
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if isinstance(name, ZipInfo):
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# 'name' is already an info object
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zinfo = name
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else:
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# Get info object for name
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zinfo = self.getinfo(name)
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zef_file.seek(zinfo.header_offset, 0)
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# Skip the file header:
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fheader = zef_file.read(sizeFileHeader)
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if fheader[0:4] != stringFileHeader:
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raise BadZipfile, "Bad magic number for file header"
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fheader = struct.unpack(structFileHeader, fheader)
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fname = zef_file.read(fheader[_FH_FILENAME_LENGTH])
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if fheader[_FH_EXTRA_FIELD_LENGTH]:
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zef_file.read(fheader[_FH_EXTRA_FIELD_LENGTH])
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if fname != zinfo.orig_filename:
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raise BadZipfile, \
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'File name in directory "%s" and header "%s" differ.' % (
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zinfo.orig_filename, fname)
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# check for encrypted flag & handle password
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is_encrypted = zinfo.flag_bits & 0x1
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zd = None
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if is_encrypted:
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if not pwd:
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pwd = self.pwd
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if not pwd:
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raise RuntimeError, "File %s is encrypted, " \
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"password required for extraction" % name
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zd = _ZipDecrypter(pwd)
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# The first 12 bytes in the cypher stream is an encryption header
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# used to strengthen the algorithm. The first 11 bytes are
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# completely random, while the 12th contains the MSB of the CRC,
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# or the MSB of the file time depending on the header type
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# and is used to check the correctness of the password.
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bytes = zef_file.read(12)
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h = map(zd, bytes[0:12])
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if zinfo.flag_bits & 0x8:
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# compare against the file type from extended local headers
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check_byte = (zinfo._raw_time >> 8) & 0xff
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try:
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# Make sure we have an info object
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if isinstance(name, ZipInfo):
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# 'name' is already an info object
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zinfo = name
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else:
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# compare against the CRC otherwise
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check_byte = (zinfo.CRC >> 24) & 0xff
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if ord(h[11]) != check_byte:
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raise RuntimeError("Bad password for file", name)
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# Get info object for name
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zinfo = self.getinfo(name)
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return ZipExtFile(zef_file, mode, zinfo, zd,
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close_fileobj=should_close)
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zef_file.seek(zinfo.header_offset, 0)
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# Skip the file header:
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fheader = zef_file.read(sizeFileHeader)
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if fheader[0:4] != stringFileHeader:
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raise BadZipfile, "Bad magic number for file header"
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fheader = struct.unpack(structFileHeader, fheader)
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fname = zef_file.read(fheader[_FH_FILENAME_LENGTH])
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if fheader[_FH_EXTRA_FIELD_LENGTH]:
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zef_file.read(fheader[_FH_EXTRA_FIELD_LENGTH])
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if fname != zinfo.orig_filename:
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raise BadZipfile, \
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'File name in directory "%s" and header "%s" differ.' % (
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zinfo.orig_filename, fname)
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# check for encrypted flag & handle password
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is_encrypted = zinfo.flag_bits & 0x1
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zd = None
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if is_encrypted:
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if not pwd:
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pwd = self.pwd
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if not pwd:
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raise RuntimeError, "File %s is encrypted, " \
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"password required for extraction" % name
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zd = _ZipDecrypter(pwd)
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# The first 12 bytes in the cypher stream is an encryption header
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# used to strengthen the algorithm. The first 11 bytes are
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# completely random, while the 12th contains the MSB of the CRC,
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# or the MSB of the file time depending on the header type
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# and is used to check the correctness of the password.
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bytes = zef_file.read(12)
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h = map(zd, bytes[0:12])
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if zinfo.flag_bits & 0x8:
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# compare against the file type from extended local headers
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check_byte = (zinfo._raw_time >> 8) & 0xff
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else:
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# compare against the CRC otherwise
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check_byte = (zinfo.CRC >> 24) & 0xff
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if ord(h[11]) != check_byte:
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raise RuntimeError("Bad password for file", name)
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return ZipExtFile(zef_file, mode, zinfo, zd,
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close_fileobj=should_close)
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except:
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if should_close:
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zef_file.close()
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raise
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def extract(self, member, path=None, pwd=None):
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"""Extract a member from the archive to the current working directory,
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@ -1019,11 +1017,9 @@ class ZipFile(object):
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os.mkdir(targetpath)
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return targetpath
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source = self.open(member, pwd=pwd)
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target = file(targetpath, "wb")
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shutil.copyfileobj(source, target)
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source.close()
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target.close()
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with self.open(member, pwd=pwd) as source, \
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file(targetpath, "wb") as target:
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shutil.copyfileobj(source, target)
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return targetpath
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@ -1184,102 +1180,104 @@ class ZipFile(object):
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if self.fp is None:
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return
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if self.mode in ("w", "a") and self._didModify: # write ending records
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count = 0
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pos1 = self.fp.tell()
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for zinfo in self.filelist: # write central directory
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count = count + 1
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dt = zinfo.date_time
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dosdate = (dt[0] - 1980) << 9 | dt[1] << 5 | dt[2]
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dostime = dt[3] << 11 | dt[4] << 5 | (dt[5] // 2)
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extra = []
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if zinfo.file_size > ZIP64_LIMIT \
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or zinfo.compress_size > ZIP64_LIMIT:
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extra.append(zinfo.file_size)
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extra.append(zinfo.compress_size)
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file_size = 0xffffffff
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compress_size = 0xffffffff
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else:
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file_size = zinfo.file_size
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compress_size = zinfo.compress_size
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try:
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if self.mode in ("w", "a") and self._didModify: # write ending records
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count = 0
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pos1 = self.fp.tell()
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for zinfo in self.filelist: # write central directory
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count = count + 1
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dt = zinfo.date_time
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dosdate = (dt[0] - 1980) << 9 | dt[1] << 5 | dt[2]
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dostime = dt[3] << 11 | dt[4] << 5 | (dt[5] // 2)
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extra = []
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if zinfo.file_size > ZIP64_LIMIT \
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or zinfo.compress_size > ZIP64_LIMIT:
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extra.append(zinfo.file_size)
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extra.append(zinfo.compress_size)
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file_size = 0xffffffff
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compress_size = 0xffffffff
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else:
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file_size = zinfo.file_size
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compress_size = zinfo.compress_size
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if zinfo.header_offset > ZIP64_LIMIT:
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extra.append(zinfo.header_offset)
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header_offset = 0xffffffffL
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else:
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header_offset = zinfo.header_offset
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if zinfo.header_offset > ZIP64_LIMIT:
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extra.append(zinfo.header_offset)
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header_offset = 0xffffffffL
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else:
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header_offset = zinfo.header_offset
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extra_data = zinfo.extra
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if extra:
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# Append a ZIP64 field to the extra's
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extra_data = struct.pack(
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'<HH' + 'Q'*len(extra),
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1, 8*len(extra), *extra) + extra_data
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extra_data = zinfo.extra
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if extra:
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# Append a ZIP64 field to the extra's
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extra_data = struct.pack(
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'<HH' + 'Q'*len(extra),
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1, 8*len(extra), *extra) + extra_data
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extract_version = max(45, zinfo.extract_version)
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create_version = max(45, zinfo.create_version)
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else:
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extract_version = zinfo.extract_version
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create_version = zinfo.create_version
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extract_version = max(45, zinfo.extract_version)
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create_version = max(45, zinfo.create_version)
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else:
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extract_version = zinfo.extract_version
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create_version = zinfo.create_version
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try:
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filename, flag_bits = zinfo._encodeFilenameFlags()
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centdir = struct.pack(structCentralDir,
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stringCentralDir, create_version,
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zinfo.create_system, extract_version, zinfo.reserved,
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flag_bits, zinfo.compress_type, dostime, dosdate,
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zinfo.CRC, compress_size, file_size,
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len(filename), len(extra_data), len(zinfo.comment),
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0, zinfo.internal_attr, zinfo.external_attr,
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header_offset)
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except DeprecationWarning:
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print >>sys.stderr, (structCentralDir,
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stringCentralDir, create_version,
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zinfo.create_system, extract_version, zinfo.reserved,
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zinfo.flag_bits, zinfo.compress_type, dostime, dosdate,
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zinfo.CRC, compress_size, file_size,
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len(zinfo.filename), len(extra_data), len(zinfo.comment),
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0, zinfo.internal_attr, zinfo.external_attr,
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header_offset)
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raise
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self.fp.write(centdir)
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self.fp.write(filename)
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self.fp.write(extra_data)
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self.fp.write(zinfo.comment)
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try:
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filename, flag_bits = zinfo._encodeFilenameFlags()
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centdir = struct.pack(structCentralDir,
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stringCentralDir, create_version,
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zinfo.create_system, extract_version, zinfo.reserved,
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flag_bits, zinfo.compress_type, dostime, dosdate,
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zinfo.CRC, compress_size, file_size,
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len(filename), len(extra_data), len(zinfo.comment),
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0, zinfo.internal_attr, zinfo.external_attr,
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header_offset)
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except DeprecationWarning:
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print >>sys.stderr, (structCentralDir,
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stringCentralDir, create_version,
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zinfo.create_system, extract_version, zinfo.reserved,
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zinfo.flag_bits, zinfo.compress_type, dostime, dosdate,
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zinfo.CRC, compress_size, file_size,
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len(zinfo.filename), len(extra_data), len(zinfo.comment),
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0, zinfo.internal_attr, zinfo.external_attr,
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header_offset)
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raise
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self.fp.write(centdir)
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self.fp.write(filename)
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self.fp.write(extra_data)
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self.fp.write(zinfo.comment)
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pos2 = self.fp.tell()
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# Write end-of-zip-archive record
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centDirCount = count
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centDirSize = pos2 - pos1
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centDirOffset = pos1
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if (centDirCount >= ZIP_FILECOUNT_LIMIT or
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centDirOffset > ZIP64_LIMIT or
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centDirSize > ZIP64_LIMIT):
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# Need to write the ZIP64 end-of-archive records
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zip64endrec = struct.pack(
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structEndArchive64, stringEndArchive64,
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44, 45, 45, 0, 0, centDirCount, centDirCount,
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centDirSize, centDirOffset)
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self.fp.write(zip64endrec)
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pos2 = self.fp.tell()
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# Write end-of-zip-archive record
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centDirCount = count
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centDirSize = pos2 - pos1
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centDirOffset = pos1
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if (centDirCount >= ZIP_FILECOUNT_LIMIT or
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centDirOffset > ZIP64_LIMIT or
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centDirSize > ZIP64_LIMIT):
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# Need to write the ZIP64 end-of-archive records
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zip64endrec = struct.pack(
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structEndArchive64, stringEndArchive64,
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44, 45, 45, 0, 0, centDirCount, centDirCount,
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centDirSize, centDirOffset)
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self.fp.write(zip64endrec)
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zip64locrec = struct.pack(
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structEndArchive64Locator,
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stringEndArchive64Locator, 0, pos2, 1)
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self.fp.write(zip64locrec)
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centDirCount = min(centDirCount, 0xFFFF)
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centDirSize = min(centDirSize, 0xFFFFFFFF)
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centDirOffset = min(centDirOffset, 0xFFFFFFFF)
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zip64locrec = struct.pack(
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structEndArchive64Locator,
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stringEndArchive64Locator, 0, pos2, 1)
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self.fp.write(zip64locrec)
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centDirCount = min(centDirCount, 0xFFFF)
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centDirSize = min(centDirSize, 0xFFFFFFFF)
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centDirOffset = min(centDirOffset, 0xFFFFFFFF)
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endrec = struct.pack(structEndArchive, stringEndArchive,
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0, 0, centDirCount, centDirCount,
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centDirSize, centDirOffset, len(self._comment))
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self.fp.write(endrec)
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self.fp.write(self._comment)
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self.fp.flush()
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if not self._filePassed:
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self.fp.close()
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self.fp = None
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endrec = struct.pack(structEndArchive, stringEndArchive,
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0, 0, centDirCount, centDirCount,
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centDirSize, centDirOffset, len(self._comment))
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self.fp.write(endrec)
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self.fp.write(self._comment)
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self.fp.flush()
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finally:
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fp = self.fp
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self.fp = None
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if not self._filePassed:
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fp.close()
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class PyZipFile(ZipFile):
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@ -1401,16 +1399,15 @@ def main(args = None):
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if len(args) != 2:
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print USAGE
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sys.exit(1)
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zf = ZipFile(args[1], 'r')
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zf.printdir()
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zf.close()
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with ZipFile(args[1], 'r') as zf:
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zf.printdir()
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elif args[0] == '-t':
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if len(args) != 2:
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print USAGE
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sys.exit(1)
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zf = ZipFile(args[1], 'r')
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badfile = zf.testzip()
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with ZipFile(args[1], 'r') as zf:
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badfile = zf.testzip()
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if badfile:
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print("The following enclosed file is corrupted: {!r}".format(badfile))
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print "Done testing"
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@ -1420,20 +1417,19 @@ def main(args = None):
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print USAGE
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sys.exit(1)
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zf = ZipFile(args[1], 'r')
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out = args[2]
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for path in zf.namelist():
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if path.startswith('./'):
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tgt = os.path.join(out, path[2:])
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else:
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tgt = os.path.join(out, path)
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with ZipFile(args[1], 'r') as zf:
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out = args[2]
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for path in zf.namelist():
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if path.startswith('./'):
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tgt = os.path.join(out, path[2:])
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else:
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tgt = os.path.join(out, path)
|
||||
|
||||
tgtdir = os.path.dirname(tgt)
|
||||
if not os.path.exists(tgtdir):
|
||||
os.makedirs(tgtdir)
|
||||
with open(tgt, 'wb') as fp:
|
||||
fp.write(zf.read(path))
|
||||
zf.close()
|
||||
tgtdir = os.path.dirname(tgt)
|
||||
if not os.path.exists(tgtdir):
|
||||
os.makedirs(tgtdir)
|
||||
with open(tgt, 'wb') as fp:
|
||||
fp.write(zf.read(path))
|
||||
|
||||
elif args[0] == '-c':
|
||||
if len(args) < 3:
|
||||
|
|
@ -1449,11 +1445,9 @@ def main(args = None):
|
|||
os.path.join(path, nm), os.path.join(zippath, nm))
|
||||
# else: ignore
|
||||
|
||||
zf = ZipFile(args[1], 'w', allowZip64=True)
|
||||
for src in args[2:]:
|
||||
addToZip(zf, src, os.path.basename(src))
|
||||
|
||||
zf.close()
|
||||
with ZipFile(args[1], 'w', allowZip64=True) as zf:
|
||||
for src in args[2:]:
|
||||
addToZip(zf, src, os.path.basename(src))
|
||||
|
||||
if __name__ == "__main__":
|
||||
main()
|
||||
|
|
|
|||
|
|
@ -148,6 +148,9 @@ Core and Builtins
|
|||
Library
|
||||
-------
|
||||
|
||||
- Issue #16408: Fix file descriptors not being closed in error conditions
|
||||
in the zipfile module. Patch by Serhiy Storchaka.
|
||||
|
||||
- Issue #16327: The subprocess module no longer leaks file descriptors
|
||||
used for stdin/stdout/stderr pipes to the child when fork() fails.
|
||||
|
||||
|
|
|
|||
Loading…
Reference in New Issue