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revlog.parseindex must be able to parse the index file even if
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an index entry is split between two 64k blocks. The ideal test
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would be to create an index file with inline data where
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64k < size < 64k + 64 (64k is the size of the read buffer, 64 is
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the size of an index entry) and with an index entry starting right
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before the 64k block boundary, and try to read it.
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We approximate that by reducing the read buffer to 1 byte.
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$ hg init a
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$ cd a
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$ echo abc > foo
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$ hg add foo
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$ hg commit -m 'add foo'
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$ echo >> foo
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$ hg commit -m 'change foo'
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$ hg log -r 0:
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changeset: 0:7c31755bf9b5
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user: test
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date: Thu Jan 01 00:00:00 1970 +0000
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summary: add foo
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changeset: 1:26333235a41c
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tag: tip
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user: test
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date: Thu Jan 01 00:00:00 1970 +0000
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summary: change foo
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$ cat >> test.py << EOF
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> from mercurial import changelog, scmutil
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> from mercurial.node import *
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>
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> class singlebyteread(object):
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> def __init__(self, real):
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> self.real = real
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>
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> def read(self, size=-1):
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> if size == 65536:
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> size = 1
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> return self.real.read(size)
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>
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> def __getattr__(self, key):
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> return getattr(self.real, key)
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>
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> def opener(*args):
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> o = scmutil.opener(*args)
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> def wrapper(*a):
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> f = o(*a)
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> return singlebyteread(f)
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> return wrapper
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>
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> cl = changelog.changelog(opener('.hg/store'))
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> print len(cl), 'revisions:'
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> for r in cl:
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> print short(cl.node(r))
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> EOF
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$ python test.py
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2 revisions:
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7c31755bf9b5
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26333235a41c
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$ cd ..
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Test corrupted p1/p2 fields that could cause SEGV at parsers.c:
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#if no-pure
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$ mkdir invalidparent
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$ cd invalidparent
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$ hg clone --pull -q --config phases.publish=False ../a limit
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$ hg clone --pull -q --config phases.publish=False ../a segv
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$ rm -R limit/.hg/cache segv/.hg/cache
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$ python <<EOF
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> data = open("limit/.hg/store/00changelog.i", "rb").read()
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> for n, p in [('limit', '\0\0\0\x02'), ('segv', '\0\x01\0\0')]:
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> # corrupt p1 at rev0 and p2 at rev1
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> d = data[:24] + p + data[28:127 + 28] + p + data[127 + 32:]
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> open(n + "/.hg/store/00changelog.i", "wb").write(d)
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> EOF
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$ hg debugindex -f1 limit/.hg/store/00changelog.i
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rev flag offset length size base link p1 p2 nodeid
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0 0000 0 63 62 0 0 2 -1 7c31755bf9b5
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1 0000 63 66 65 1 1 0 2 26333235a41c
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$ hg debugindex -f1 segv/.hg/store/00changelog.i
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rev flag offset length size base link p1 p2 nodeid
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0 0000 0 63 62 0 0 65536 -1 7c31755bf9b5
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1 0000 63 66 65 1 1 0 65536 26333235a41c
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$ cat <<EOF > test.py
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> import sys
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> from mercurial import changelog, scmutil
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> cl = changelog.changelog(scmutil.vfs(sys.argv[1]))
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> n0, n1 = cl.node(0), cl.node(1)
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> ops = [
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> ('compute_phases_map_sets', lambda: cl.computephases([[0], []])),
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> ('index_headrevs', lambda: cl.headrevs()),
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> ('find_gca_candidates', lambda: cl.commonancestorsheads(n0, n1)),
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> ('find_deepest', lambda: cl.ancestor(n0, n1)),
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> ]
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|
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> for l, f in ops:
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|
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> print l + ':',
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|
|
> try:
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> f()
|
|
|
> print 'uncaught buffer overflow?'
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|
|
> except ValueError, inst:
|
|
|
> print inst
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> EOF
|
|
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|
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|
$ python test.py limit/.hg/store
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|
compute_phases_map_sets: parent out of range
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|
index_headrevs: parent out of range
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|
find_gca_candidates: parent out of range
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|
find_deepest: parent out of range
|
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|
$ python test.py segv/.hg/store
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|
compute_phases_map_sets: parent out of range
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|
index_headrevs: parent out of range
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|
find_gca_candidates: parent out of range
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|
find_deepest: parent out of range
|
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|
|
|
|
$ cd ..
|
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|
#endif
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|
