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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 __future__ import print_function
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> from mercurial import changelog, vfs
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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 __enter__(self):
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> self.real.__enter__()
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> return self
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>
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> def __exit__(self, *args, **kwargs):
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> return self.real.__exit__(*args, **kwargs)
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>
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> def opener(*args):
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> o = vfs.vfs(*args)
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> def wrapper(*a, **kwargs):
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> f = o(*a, **kwargs)
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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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#if no-pure
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Test SEGV caused by bad revision passed to reachableroots() (issue4775):
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$ cd a
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$ $PYTHON <<EOF
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> from __future__ import print_function
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> from mercurial import changelog, vfs
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> cl = changelog.changelog(vfs.vfs('.hg/store'))
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> print('good heads:')
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> for head in [0, len(cl) - 1, -1]:
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> print('%s: %r' % (head, cl.reachableroots(0, [head], [0])))
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> print('bad heads:')
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> for head in [len(cl), 10000, -2, -10000, None]:
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> print('%s:' % head, end=' ')
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|
|
> try:
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> cl.reachableroots(0, [head], [0])
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> print('uncaught buffer overflow?')
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|
|
> except (IndexError, TypeError) as inst:
|
|
|
> print(inst)
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> print('good roots:')
|
|
|
> for root in [0, len(cl) - 1, -1]:
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|
> print('%s: %r' % (root, cl.reachableroots(root, [len(cl) - 1], [root])))
|
|
|
> print('out-of-range roots are ignored:')
|
|
|
> for root in [len(cl), 10000, -2, -10000]:
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|
|
> print('%s: %r' % (root, cl.reachableroots(root, [len(cl) - 1], [root])))
|
|
|
> print('bad roots:')
|
|
|
> for root in [None]:
|
|
|
> print('%s:' % root, end=' ')
|
|
|
> try:
|
|
|
> cl.reachableroots(root, [len(cl) - 1], [root])
|
|
|
> print('uncaught error?')
|
|
|
> except TypeError as inst:
|
|
|
> print(inst)
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|
|
> EOF
|
|
|
good heads:
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|
|
0: [0]
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|
|
1: [0]
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|
|
-1: []
|
|
|
bad heads:
|
|
|
2: head out of range
|
|
|
10000: head out of range
|
|
|
-2: head out of range
|
|
|
-10000: head out of range
|
|
|
None: an integer is required
|
|
|
good roots:
|
|
|
0: [0]
|
|
|
1: [1]
|
|
|
-1: [-1]
|
|
|
out-of-range roots are ignored:
|
|
|
2: []
|
|
|
10000: []
|
|
|
-2: []
|
|
|
-10000: []
|
|
|
bad roots:
|
|
|
None: an integer is required
|
|
|
|
|
|
$ cd ..
|
|
|
|
|
|
Test corrupted p1/p2 fields that could cause SEGV at parsers.c:
|
|
|
|
|
|
$ mkdir invalidparent
|
|
|
$ cd invalidparent
|
|
|
|
|
|
$ hg clone --pull -q --config phases.publish=False ../a limit
|
|
|
$ hg clone --pull -q --config phases.publish=False ../a segv
|
|
|
$ rm -R limit/.hg/cache segv/.hg/cache
|
|
|
|
|
|
$ $PYTHON <<EOF
|
|
|
> data = open("limit/.hg/store/00changelog.i", "rb").read()
|
|
|
> for n, p in [(b'limit', b'\0\0\0\x02'), (b'segv', b'\0\x01\0\0')]:
|
|
|
> # corrupt p1 at rev0 and p2 at rev1
|
|
|
> d = data[:24] + p + data[28:127 + 28] + p + data[127 + 32:]
|
|
|
> open(n + b"/.hg/store/00changelog.i", "wb").write(d)
|
|
|
> EOF
|
|
|
|
|
|
$ hg -R limit debugindex -f1 -c
|
|
|
rev flag size link p1 p2 nodeid
|
|
|
0 0000 62 0 2 -1 7c31755bf9b5
|
|
|
1 0000 65 1 0 2 26333235a41c
|
|
|
|
|
|
$ hg -R limit debugdeltachain -c
|
|
|
rev chain# chainlen prev delta size rawsize chainsize ratio lindist extradist extraratio
|
|
|
0 1 1 -1 base 63 62 63 1.01613 63 0 0.00000
|
|
|
1 2 1 -1 base 66 65 66 1.01538 66 0 0.00000
|
|
|
|
|
|
$ hg -R segv debugindex -f1 -c
|
|
|
rev flag size link p1 p2 nodeid
|
|
|
0 0000 62 0 65536 -1 7c31755bf9b5
|
|
|
1 0000 65 1 0 65536 26333235a41c
|
|
|
|
|
|
$ hg -R segv debugdeltachain -c
|
|
|
rev chain# chainlen prev delta size rawsize chainsize ratio lindist extradist extraratio
|
|
|
0 1 1 -1 base 63 62 63 1.01613 63 0 0.00000
|
|
|
1 2 1 -1 base 66 65 66 1.01538 66 0 0.00000
|
|
|
|
|
|
$ cat <<EOF > test.py
|
|
|
> from __future__ import print_function
|
|
|
> import sys
|
|
|
> from mercurial import changelog, vfs
|
|
|
> cl = changelog.changelog(vfs.vfs(sys.argv[1]))
|
|
|
> n0, n1 = cl.node(0), cl.node(1)
|
|
|
> ops = [
|
|
|
> ('reachableroots',
|
|
|
> lambda: cl.index.reachableroots2(0, [1], [0], False)),
|
|
|
> ('compute_phases_map_sets', lambda: cl.computephases([[0], []])),
|
|
|
> ('index_headrevs', lambda: cl.headrevs()),
|
|
|
> ('find_gca_candidates', lambda: cl.commonancestorsheads(n0, n1)),
|
|
|
> ('find_deepest', lambda: cl.ancestor(n0, n1)),
|
|
|
> ]
|
|
|
> for l, f in ops:
|
|
|
> print(l + ':', end=' ')
|
|
|
> try:
|
|
|
> f()
|
|
|
> print('uncaught buffer overflow?')
|
|
|
> except ValueError as inst:
|
|
|
> print(inst)
|
|
|
> EOF
|
|
|
|
|
|
$ $PYTHON test.py limit/.hg/store
|
|
|
reachableroots: parent out of range
|
|
|
compute_phases_map_sets: parent out of range
|
|
|
index_headrevs: parent out of range
|
|
|
find_gca_candidates: parent out of range
|
|
|
find_deepest: parent out of range
|
|
|
$ $PYTHON test.py segv/.hg/store
|
|
|
reachableroots: parent out of range
|
|
|
compute_phases_map_sets: parent out of range
|
|
|
index_headrevs: parent out of range
|
|
|
find_gca_candidates: parent out of range
|
|
|
find_deepest: parent out of range
|
|
|
|
|
|
$ cd ..
|
|
|
|
|
|
#endif
|
|
|
|
