author | Bryan O'Sullivan <bos@serpentine.com> |
Sun, 27 Dec 2015 23:55:54 +0900 | |
changeset 27524 | f5b6b4e574c1 |
parent 26094 | df41c7be16d6 |
child 31226 | 21fa3d3688f3 |
permissions | -rw-r--r-- |
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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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|
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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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|
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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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$ 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 mercurial import changelog, scmutil |
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> cl = changelog.changelog(scmutil.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, |
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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: |
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> print inst |
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> print 'good roots:' |
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> for root in [0, len(cl) - 1, -1]: |
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> print '%s: %r' % (root, cl.reachableroots(root, [len(cl) - 1], [root])) |
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> print 'out-of-range roots are ignored:' |
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> for root in [len(cl), 10000, -2, -10000]: |
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> print '%s: %r' % (root, cl.reachableroots(root, [len(cl) - 1], [root])) |
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> print 'bad roots:' |
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> for root in [None]: |
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> print '%s:' % root, |
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> try: |
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> cl.reachableroots(root, [len(cl) - 1], [root]) |
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> print 'uncaught error?' |
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> except TypeError as inst: |
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> print inst |
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> EOF |
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good heads: |
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0: [0] |
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1: [0] |
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-1: [] |
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bad heads: |
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2: head out of range |
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10000: head out of range |
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-2: head out of range |
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-10000: head out of range |
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None: an integer is required |
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good roots: |
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0: [0] |
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1: [1] |
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-1: [-1] |
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out-of-range roots are ignored: |
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113 |
2: [] |
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10000: [] |
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115 |
-2: [] |
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116 |
-10000: [] |
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117 |
bad roots: |
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None: an integer is required |
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119 |
|
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$ cd .. |
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121 |
|
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Test corrupted p1/p2 fields that could cause SEGV at parsers.c: |
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123 |
|
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$ mkdir invalidparent |
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$ cd invalidparent |
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126 |
|
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127 |
$ 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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130 |
|
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131 |
$ python <<EOF |
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> data = open("limit/.hg/store/00changelog.i", "rb").read() |
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133 |
> 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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137 |
> EOF |
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138 |
|
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139 |
$ hg debugindex -f1 limit/.hg/store/00changelog.i |
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140 |
rev flag offset length size base link p1 p2 nodeid |
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141 |
0 0000 0 63 62 0 0 2 -1 7c31755bf9b5 |
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142 |
1 0000 63 66 65 1 1 0 2 26333235a41c |
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143 |
$ hg debugindex -f1 segv/.hg/store/00changelog.i |
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144 |
rev flag offset length size base link p1 p2 nodeid |
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145 |
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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147 |
|
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148 |
$ cat <<EOF > test.py |
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149 |
> import sys |
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150 |
> from mercurial import changelog, scmutil |
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151 |
> cl = changelog.changelog(scmutil.vfs(sys.argv[1])) |
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152 |
> n0, n1 = cl.node(0), cl.node(1) |
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153 |
> ops = [ |
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154 |
> ('reachableroots', |
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155 |
> lambda: cl.index.reachableroots2(0, [1], [0], False)), |
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156 |
> ('compute_phases_map_sets', lambda: cl.computephases([[0], []])), |
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157 |
> ('index_headrevs', lambda: cl.headrevs()), |
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158 |
> ('find_gca_candidates', lambda: cl.commonancestorsheads(n0, n1)), |
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159 |
> ('find_deepest', lambda: cl.ancestor(n0, n1)), |
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160 |
> ] |
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161 |
> for l, f in ops: |
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162 |
> print l + ':', |
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163 |
> try: |
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164 |
> f() |
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165 |
> print 'uncaught buffer overflow?' |
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166 |
> except ValueError, inst: |
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167 |
> print inst |
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168 |
> EOF |
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169 |
|
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170 |
$ python test.py limit/.hg/store |
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171 |
reachableroots: parent out of range |
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172 |
compute_phases_map_sets: parent out of range |
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173 |
index_headrevs: parent out of range |
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174 |
find_gca_candidates: parent out of range |
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175 |
find_deepest: parent out of range |
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176 |
$ python test.py segv/.hg/store |
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177 |
reachableroots: parent out of range |
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178 |
compute_phases_map_sets: parent out of range |
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179 |
index_headrevs: parent out of range |
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180 |
find_gca_candidates: parent out of range |
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181 |
find_deepest: parent out of range |
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182 |
|
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183 |
$ cd .. |
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184 |
|
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185 |
#endif |