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svn+ssh://pythondev@svn.python.org/python/branches/py3k ........ r88022 | antoine.pitrou | 2011-01-15 17:17:07 +0100 (sam., 15 janv. 2011) | 7 lines Issue #10916: mmap should not segfault when a file is mapped using 0 as length and a non-zero offset, and an attempt to read past the end of file is made (IndexError is raised instead). Patch by Ross Lagerwall. Requested by Georg. ........
617 lines
20 KiB
Python
617 lines
20 KiB
Python
from test.test_support import TESTFN, run_unittest, import_module
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import unittest
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import os, re, itertools, socket
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mmap = import_module('mmap')
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PAGESIZE = mmap.PAGESIZE
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class MmapTests(unittest.TestCase):
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def setUp(self):
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if os.path.exists(TESTFN):
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os.unlink(TESTFN)
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def tearDown(self):
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try:
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os.unlink(TESTFN)
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except OSError:
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pass
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def test_basic(self):
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# Test mmap module on Unix systems and Windows
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# Create a file to be mmap'ed.
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f = open(TESTFN, 'w+')
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try:
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# Write 2 pages worth of data to the file
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f.write('\0'* PAGESIZE)
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f.write('foo')
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f.write('\0'* (PAGESIZE-3) )
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f.flush()
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m = mmap.mmap(f.fileno(), 2 * PAGESIZE)
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f.close()
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# Simple sanity checks
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tp = str(type(m)) # SF bug 128713: segfaulted on Linux
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self.assertEqual(m.find('foo'), PAGESIZE)
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self.assertEqual(len(m), 2*PAGESIZE)
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self.assertEqual(m[0], '\0')
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self.assertEqual(m[0:3], '\0\0\0')
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# Shouldn't crash on boundary (Issue #5292)
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self.assertRaises(IndexError, m.__getitem__, len(m))
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self.assertRaises(IndexError, m.__setitem__, len(m), '\0')
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# Modify the file's content
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m[0] = '3'
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m[PAGESIZE +3: PAGESIZE +3+3] = 'bar'
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# Check that the modification worked
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self.assertEqual(m[0], '3')
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self.assertEqual(m[0:3], '3\0\0')
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self.assertEqual(m[PAGESIZE-1 : PAGESIZE + 7], '\0foobar\0')
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m.flush()
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# Test doing a regular expression match in an mmap'ed file
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match = re.search('[A-Za-z]+', m)
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if match is None:
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self.fail('regex match on mmap failed!')
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else:
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start, end = match.span(0)
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length = end - start
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self.assertEqual(start, PAGESIZE)
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self.assertEqual(end, PAGESIZE + 6)
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# test seeking around (try to overflow the seek implementation)
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m.seek(0,0)
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self.assertEqual(m.tell(), 0)
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m.seek(42,1)
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self.assertEqual(m.tell(), 42)
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m.seek(0,2)
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self.assertEqual(m.tell(), len(m))
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# Try to seek to negative position...
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self.assertRaises(ValueError, m.seek, -1)
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# Try to seek beyond end of mmap...
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self.assertRaises(ValueError, m.seek, 1, 2)
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# Try to seek to negative position...
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self.assertRaises(ValueError, m.seek, -len(m)-1, 2)
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# Try resizing map
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try:
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m.resize(512)
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except SystemError:
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# resize() not supported
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# No messages are printed, since the output of this test suite
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# would then be different across platforms.
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pass
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else:
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# resize() is supported
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self.assertEqual(len(m), 512)
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# Check that we can no longer seek beyond the new size.
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self.assertRaises(ValueError, m.seek, 513, 0)
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# Check that the underlying file is truncated too
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# (bug #728515)
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f = open(TESTFN)
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f.seek(0, 2)
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self.assertEqual(f.tell(), 512)
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f.close()
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self.assertEqual(m.size(), 512)
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m.close()
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finally:
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try:
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f.close()
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except OSError:
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pass
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def test_access_parameter(self):
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# Test for "access" keyword parameter
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mapsize = 10
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open(TESTFN, "wb").write("a"*mapsize)
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f = open(TESTFN, "rb")
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m = mmap.mmap(f.fileno(), mapsize, access=mmap.ACCESS_READ)
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self.assertEqual(m[:], 'a'*mapsize, "Readonly memory map data incorrect.")
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# Ensuring that readonly mmap can't be slice assigned
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try:
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m[:] = 'b'*mapsize
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except TypeError:
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pass
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else:
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self.fail("Able to write to readonly memory map")
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# Ensuring that readonly mmap can't be item assigned
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try:
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m[0] = 'b'
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except TypeError:
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pass
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else:
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self.fail("Able to write to readonly memory map")
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# Ensuring that readonly mmap can't be write() to
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try:
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m.seek(0,0)
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m.write('abc')
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except TypeError:
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pass
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else:
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self.fail("Able to write to readonly memory map")
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# Ensuring that readonly mmap can't be write_byte() to
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try:
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m.seek(0,0)
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m.write_byte('d')
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except TypeError:
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pass
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else:
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self.fail("Able to write to readonly memory map")
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# Ensuring that readonly mmap can't be resized
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try:
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m.resize(2*mapsize)
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except SystemError: # resize is not universally supported
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pass
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except TypeError:
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pass
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else:
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self.fail("Able to resize readonly memory map")
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f.close()
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del m, f
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self.assertEqual(open(TESTFN, "rb").read(), 'a'*mapsize,
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"Readonly memory map data file was modified")
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# Opening mmap with size too big
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import sys
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f = open(TESTFN, "r+b")
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try:
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m = mmap.mmap(f.fileno(), mapsize+1)
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except ValueError:
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# we do not expect a ValueError on Windows
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# CAUTION: This also changes the size of the file on disk, and
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# later tests assume that the length hasn't changed. We need to
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# repair that.
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if sys.platform.startswith('win'):
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self.fail("Opening mmap with size+1 should work on Windows.")
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else:
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# we expect a ValueError on Unix, but not on Windows
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if not sys.platform.startswith('win'):
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self.fail("Opening mmap with size+1 should raise ValueError.")
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m.close()
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f.close()
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if sys.platform.startswith('win'):
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# Repair damage from the resizing test.
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f = open(TESTFN, 'r+b')
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f.truncate(mapsize)
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f.close()
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# Opening mmap with access=ACCESS_WRITE
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f = open(TESTFN, "r+b")
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m = mmap.mmap(f.fileno(), mapsize, access=mmap.ACCESS_WRITE)
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# Modifying write-through memory map
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m[:] = 'c'*mapsize
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self.assertEqual(m[:], 'c'*mapsize,
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"Write-through memory map memory not updated properly.")
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m.flush()
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m.close()
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f.close()
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f = open(TESTFN, 'rb')
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stuff = f.read()
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f.close()
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self.assertEqual(stuff, 'c'*mapsize,
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"Write-through memory map data file not updated properly.")
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# Opening mmap with access=ACCESS_COPY
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f = open(TESTFN, "r+b")
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m = mmap.mmap(f.fileno(), mapsize, access=mmap.ACCESS_COPY)
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# Modifying copy-on-write memory map
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m[:] = 'd'*mapsize
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self.assertEqual(m[:], 'd' * mapsize,
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"Copy-on-write memory map data not written correctly.")
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m.flush()
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self.assertEqual(open(TESTFN, "rb").read(), 'c'*mapsize,
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"Copy-on-write test data file should not be modified.")
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# Ensuring copy-on-write maps cannot be resized
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self.assertRaises(TypeError, m.resize, 2*mapsize)
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f.close()
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del m, f
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# Ensuring invalid access parameter raises exception
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f = open(TESTFN, "r+b")
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self.assertRaises(ValueError, mmap.mmap, f.fileno(), mapsize, access=4)
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f.close()
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if os.name == "posix":
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# Try incompatible flags, prot and access parameters.
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f = open(TESTFN, "r+b")
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self.assertRaises(ValueError, mmap.mmap, f.fileno(), mapsize,
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flags=mmap.MAP_PRIVATE,
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prot=mmap.PROT_READ, access=mmap.ACCESS_WRITE)
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f.close()
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def test_bad_file_desc(self):
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# Try opening a bad file descriptor...
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self.assertRaises(mmap.error, mmap.mmap, -2, 4096)
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def test_tougher_find(self):
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# Do a tougher .find() test. SF bug 515943 pointed out that, in 2.2,
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# searching for data with embedded \0 bytes didn't work.
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f = open(TESTFN, 'w+')
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data = 'aabaac\x00deef\x00\x00aa\x00'
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n = len(data)
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f.write(data)
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f.flush()
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m = mmap.mmap(f.fileno(), n)
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f.close()
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for start in range(n+1):
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for finish in range(start, n+1):
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slice = data[start : finish]
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self.assertEqual(m.find(slice), data.find(slice))
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self.assertEqual(m.find(slice + 'x'), -1)
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m.close()
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def test_find_end(self):
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# test the new 'end' parameter works as expected
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f = open(TESTFN, 'w+')
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data = 'one two ones'
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n = len(data)
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f.write(data)
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f.flush()
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m = mmap.mmap(f.fileno(), n)
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f.close()
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self.assertEqual(m.find('one'), 0)
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self.assertEqual(m.find('ones'), 8)
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self.assertEqual(m.find('one', 0, -1), 0)
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self.assertEqual(m.find('one', 1), 8)
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self.assertEqual(m.find('one', 1, -1), 8)
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self.assertEqual(m.find('one', 1, -2), -1)
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def test_rfind(self):
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# test the new 'end' parameter works as expected
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f = open(TESTFN, 'w+')
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data = 'one two ones'
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n = len(data)
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f.write(data)
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f.flush()
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m = mmap.mmap(f.fileno(), n)
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f.close()
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self.assertEqual(m.rfind('one'), 8)
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self.assertEqual(m.rfind('one '), 0)
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self.assertEqual(m.rfind('one', 0, -1), 8)
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self.assertEqual(m.rfind('one', 0, -2), 0)
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self.assertEqual(m.rfind('one', 1, -1), 8)
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self.assertEqual(m.rfind('one', 1, -2), -1)
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def test_double_close(self):
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# make sure a double close doesn't crash on Solaris (Bug# 665913)
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f = open(TESTFN, 'w+')
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f.write(2**16 * 'a') # Arbitrary character
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f.close()
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f = open(TESTFN)
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mf = mmap.mmap(f.fileno(), 2**16, access=mmap.ACCESS_READ)
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mf.close()
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mf.close()
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f.close()
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def test_entire_file(self):
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# test mapping of entire file by passing 0 for map length
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if hasattr(os, "stat"):
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f = open(TESTFN, "w+")
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f.write(2**16 * 'm') # Arbitrary character
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f.close()
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f = open(TESTFN, "rb+")
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mf = mmap.mmap(f.fileno(), 0)
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self.assertEqual(len(mf), 2**16, "Map size should equal file size.")
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self.assertEqual(mf.read(2**16), 2**16 * "m")
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mf.close()
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f.close()
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def test_length_0_offset(self):
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# Issue #10916: test mapping of remainder of file by passing 0 for
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# map length with an offset doesn't cause a segfault.
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if not hasattr(os, "stat"):
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self.skipTest("needs os.stat")
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with open(TESTFN, "wb+") as f:
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f.write(49152 * b'm') # Arbitrary character
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with open(TESTFN, "rb") as f:
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mf = mmap.mmap(f.fileno(), 0, offset=40960, access=mmap.ACCESS_READ)
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self.assertRaises(IndexError, mf.__getitem__, 45000)
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mf.close()
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def test_move(self):
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# make move works everywhere (64-bit format problem earlier)
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f = open(TESTFN, 'w+')
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f.write("ABCDEabcde") # Arbitrary character
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f.flush()
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mf = mmap.mmap(f.fileno(), 10)
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mf.move(5, 0, 5)
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self.assertEqual(mf[:], "ABCDEABCDE", "Map move should have duplicated front 5")
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mf.close()
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f.close()
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# more excessive test
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data = "0123456789"
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for dest in range(len(data)):
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for src in range(len(data)):
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for count in range(len(data) - max(dest, src)):
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expected = data[:dest] + data[src:src+count] + data[dest+count:]
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m = mmap.mmap(-1, len(data))
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m[:] = data
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m.move(dest, src, count)
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self.assertEqual(m[:], expected)
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m.close()
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# segfault test (Issue 5387)
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m = mmap.mmap(-1, 100)
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offsets = [-100, -1, 0, 1, 100]
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for source, dest, size in itertools.product(offsets, offsets, offsets):
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try:
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m.move(source, dest, size)
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except ValueError:
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pass
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offsets = [(-1, -1, -1), (-1, -1, 0), (-1, 0, -1), (0, -1, -1),
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(-1, 0, 0), (0, -1, 0), (0, 0, -1)]
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for source, dest, size in offsets:
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self.assertRaises(ValueError, m.move, source, dest, size)
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m.close()
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m = mmap.mmap(-1, 1) # single byte
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self.assertRaises(ValueError, m.move, 0, 0, 2)
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self.assertRaises(ValueError, m.move, 1, 0, 1)
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self.assertRaises(ValueError, m.move, 0, 1, 1)
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m.move(0, 0, 1)
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m.move(0, 0, 0)
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def test_anonymous(self):
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# anonymous mmap.mmap(-1, PAGE)
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m = mmap.mmap(-1, PAGESIZE)
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for x in xrange(PAGESIZE):
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self.assertEqual(m[x], '\0', "anonymously mmap'ed contents should be zero")
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for x in xrange(PAGESIZE):
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m[x] = ch = chr(x & 255)
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self.assertEqual(m[x], ch)
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def test_extended_getslice(self):
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# Test extended slicing by comparing with list slicing.
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s = "".join(chr(c) for c in reversed(range(256)))
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m = mmap.mmap(-1, len(s))
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m[:] = s
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self.assertEqual(m[:], s)
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indices = (0, None, 1, 3, 19, 300, -1, -2, -31, -300)
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for start in indices:
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for stop in indices:
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# Skip step 0 (invalid)
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for step in indices[1:]:
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self.assertEqual(m[start:stop:step],
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s[start:stop:step])
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def test_extended_set_del_slice(self):
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# Test extended slicing by comparing with list slicing.
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s = "".join(chr(c) for c in reversed(range(256)))
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m = mmap.mmap(-1, len(s))
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indices = (0, None, 1, 3, 19, 300, -1, -2, -31, -300)
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for start in indices:
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for stop in indices:
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# Skip invalid step 0
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for step in indices[1:]:
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m[:] = s
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self.assertEqual(m[:], s)
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L = list(s)
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# Make sure we have a slice of exactly the right length,
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# but with different data.
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data = L[start:stop:step]
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data = "".join(reversed(data))
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L[start:stop:step] = data
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m[start:stop:step] = data
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self.assertEqual(m[:], "".join(L))
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def make_mmap_file (self, f, halfsize):
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# Write 2 pages worth of data to the file
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f.write ('\0' * halfsize)
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f.write ('foo')
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f.write ('\0' * (halfsize - 3))
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f.flush ()
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return mmap.mmap (f.fileno(), 0)
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def test_offset (self):
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f = open (TESTFN, 'w+b')
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try: # unlink TESTFN no matter what
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halfsize = mmap.ALLOCATIONGRANULARITY
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m = self.make_mmap_file (f, halfsize)
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m.close ()
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f.close ()
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mapsize = halfsize * 2
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# Try invalid offset
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f = open(TESTFN, "r+b")
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for offset in [-2, -1, None]:
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try:
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m = mmap.mmap(f.fileno(), mapsize, offset=offset)
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self.assertEqual(0, 1)
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except (ValueError, TypeError, OverflowError):
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pass
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else:
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self.assertEqual(0, 0)
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f.close()
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# Try valid offset, hopefully 8192 works on all OSes
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f = open(TESTFN, "r+b")
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m = mmap.mmap(f.fileno(), mapsize - halfsize, offset=halfsize)
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self.assertEqual(m[0:3], 'foo')
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f.close()
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# Try resizing map
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try:
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m.resize(512)
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except SystemError:
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pass
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else:
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# resize() is supported
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self.assertEqual(len(m), 512)
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# Check that we can no longer seek beyond the new size.
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self.assertRaises(ValueError, m.seek, 513, 0)
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# Check that the content is not changed
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self.assertEqual(m[0:3], 'foo')
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# Check that the underlying file is truncated too
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f = open(TESTFN)
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f.seek(0, 2)
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self.assertEqual(f.tell(), halfsize + 512)
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f.close()
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self.assertEqual(m.size(), halfsize + 512)
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m.close()
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finally:
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f.close()
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|
try:
|
|
os.unlink(TESTFN)
|
|
except OSError:
|
|
pass
|
|
|
|
def test_subclass(self):
|
|
class anon_mmap(mmap.mmap):
|
|
def __new__(klass, *args, **kwargs):
|
|
return mmap.mmap.__new__(klass, -1, *args, **kwargs)
|
|
anon_mmap(PAGESIZE)
|
|
|
|
def test_prot_readonly(self):
|
|
if not hasattr(mmap, 'PROT_READ'):
|
|
return
|
|
mapsize = 10
|
|
open(TESTFN, "wb").write("a"*mapsize)
|
|
f = open(TESTFN, "rb")
|
|
m = mmap.mmap(f.fileno(), mapsize, prot=mmap.PROT_READ)
|
|
self.assertRaises(TypeError, m.write, "foo")
|
|
f.close()
|
|
|
|
def test_error(self):
|
|
self.assertTrue(issubclass(mmap.error, EnvironmentError))
|
|
self.assertIn("mmap.error", str(mmap.error))
|
|
|
|
def test_io_methods(self):
|
|
data = "0123456789"
|
|
open(TESTFN, "wb").write("x"*len(data))
|
|
f = open(TESTFN, "r+b")
|
|
m = mmap.mmap(f.fileno(), len(data))
|
|
f.close()
|
|
# Test write_byte()
|
|
for i in xrange(len(data)):
|
|
self.assertEqual(m.tell(), i)
|
|
m.write_byte(data[i])
|
|
self.assertEqual(m.tell(), i+1)
|
|
self.assertRaises(ValueError, m.write_byte, "x")
|
|
self.assertEqual(m[:], data)
|
|
# Test read_byte()
|
|
m.seek(0)
|
|
for i in xrange(len(data)):
|
|
self.assertEqual(m.tell(), i)
|
|
self.assertEqual(m.read_byte(), data[i])
|
|
self.assertEqual(m.tell(), i+1)
|
|
self.assertRaises(ValueError, m.read_byte)
|
|
# Test read()
|
|
m.seek(3)
|
|
self.assertEqual(m.read(3), "345")
|
|
self.assertEqual(m.tell(), 6)
|
|
# Test write()
|
|
m.seek(3)
|
|
m.write("bar")
|
|
self.assertEqual(m.tell(), 6)
|
|
self.assertEqual(m[:], "012bar6789")
|
|
m.seek(8)
|
|
self.assertRaises(ValueError, m.write, "bar")
|
|
|
|
if os.name == 'nt':
|
|
def test_tagname(self):
|
|
data1 = "0123456789"
|
|
data2 = "abcdefghij"
|
|
assert len(data1) == len(data2)
|
|
|
|
# Test same tag
|
|
m1 = mmap.mmap(-1, len(data1), tagname="foo")
|
|
m1[:] = data1
|
|
m2 = mmap.mmap(-1, len(data2), tagname="foo")
|
|
m2[:] = data2
|
|
self.assertEqual(m1[:], data2)
|
|
self.assertEqual(m2[:], data2)
|
|
m2.close()
|
|
m1.close()
|
|
|
|
# Test differnt tag
|
|
m1 = mmap.mmap(-1, len(data1), tagname="foo")
|
|
m1[:] = data1
|
|
m2 = mmap.mmap(-1, len(data2), tagname="boo")
|
|
m2[:] = data2
|
|
self.assertEqual(m1[:], data1)
|
|
self.assertEqual(m2[:], data2)
|
|
m2.close()
|
|
m1.close()
|
|
|
|
def test_crasher_on_windows(self):
|
|
# Should not crash (Issue 1733986)
|
|
m = mmap.mmap(-1, 1000, tagname="foo")
|
|
try:
|
|
mmap.mmap(-1, 5000, tagname="foo")[:] # same tagname, but larger size
|
|
except:
|
|
pass
|
|
m.close()
|
|
|
|
# Should not crash (Issue 5385)
|
|
open(TESTFN, "wb").write("x"*10)
|
|
f = open(TESTFN, "r+b")
|
|
m = mmap.mmap(f.fileno(), 0)
|
|
f.close()
|
|
try:
|
|
m.resize(0) # will raise WindowsError
|
|
except:
|
|
pass
|
|
try:
|
|
m[:]
|
|
except:
|
|
pass
|
|
m.close()
|
|
|
|
def test_invalid_descriptor(self):
|
|
# socket file descriptors are valid, but out of range
|
|
# for _get_osfhandle, causing a crash when validating the
|
|
# parameters to _get_osfhandle.
|
|
s = socket.socket()
|
|
try:
|
|
with self.assertRaises(mmap.error):
|
|
m = mmap.mmap(s.fileno(), 10)
|
|
finally:
|
|
s.close()
|
|
|
|
def test_main():
|
|
run_unittest(MmapTests)
|
|
|
|
if __name__ == '__main__':
|
|
test_main()
|