author | Martin von Zweigbergk <martinvonz@google.com> |
Sun, 04 Mar 2018 08:41:29 -0800 | |
changeset 40856 | c8eb8d1fc6cf |
parent 40812 | 9cdd525d97b2 |
child 40887 | 75728718257e |
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 __future__ import print_function |
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> from mercurial import changelog, node, vfs |
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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(node.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 __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: |
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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, end=' ') |
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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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109 |
-1: [] |
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110 |
bad heads: |
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111 |
2: head out of range |
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112 |
10000: head out of range |
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113 |
-2: head out of range |
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114 |
-10000: head out of range |
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115 |
None: an integer is required |
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116 |
good roots: |
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117 |
0: [0] |
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118 |
1: [1] |
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119 |
-1: [-1] |
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120 |
out-of-range roots are ignored: |
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121 |
2: [] |
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122 |
10000: [] |
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123 |
-2: [] |
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124 |
-10000: [] |
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125 |
bad roots: |
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126 |
None: an integer is required |
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127 |
|
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128 |
$ cd .. |
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129 |
|
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130 |
Test corrupted p1/p2 fields that could cause SEGV at parsers.c: |
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131 |
|
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132 |
$ mkdir invalidparent |
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133 |
$ cd invalidparent |
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134 |
|
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135 |
$ hg clone --pull -q --config phases.publish=False ../a limit |
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136 |
$ hg clone --pull -q --config phases.publish=False ../a neglimit |
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137 |
$ hg clone --pull -q --config phases.publish=False ../a segv |
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138 |
$ rm -R limit/.hg/cache neglimit/.hg/cache segv/.hg/cache |
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139 |
|
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140 |
$ "$PYTHON" <<EOF |
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141 |
> data = open("limit/.hg/store/00changelog.i", "rb").read() |
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142 |
> poisons = [ |
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143 |
> (b'limit', b'\0\0\0\x02'), |
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144 |
> (b'neglimit', b'\xff\xff\xff\xfe'), |
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145 |
> (b'segv', b'\0\x01\0\0'), |
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146 |
> ] |
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147 |
> for n, p in poisons: |
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148 |
> # corrupt p1 at rev0 and p2 at rev1 |
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149 |
> d = data[:24] + p + data[28:127 + 28] + p + data[127 + 32:] |
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150 |
> open(n + b"/.hg/store/00changelog.i", "wb").write(d) |
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151 |
> EOF |
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152 |
|
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153 |
$ hg -R limit debugrevlogindex -f1 -c |
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154 |
rev flag size link p1 p2 nodeid |
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155 |
0 0000 62 0 2 -1 7c31755bf9b5 |
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156 |
1 0000 65 1 0 2 26333235a41c |
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157 |
|
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158 |
$ hg -R limit debugdeltachain -c |
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159 |
rev chain# chainlen prev delta size rawsize chainsize ratio lindist extradist extraratio |
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160 |
0 1 1 -1 base 63 62 63 1.01613 63 0 0.00000 |
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161 |
1 2 1 -1 base 66 65 66 1.01538 66 0 0.00000 |
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162 |
|
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163 |
$ hg -R neglimit debugrevlogindex -f1 -c |
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164 |
rev flag size link p1 p2 nodeid |
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165 |
0 0000 62 0 -2 -1 7c31755bf9b5 |
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166 |
1 0000 65 1 0 -2 26333235a41c |
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167 |
|
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168 |
$ hg -R segv debugrevlogindex -f1 -c |
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169 |
rev flag size link p1 p2 nodeid |
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170 |
0 0000 62 0 65536 -1 7c31755bf9b5 |
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171 |
1 0000 65 1 0 65536 26333235a41c |
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172 |
|
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173 |
$ hg -R segv debugdeltachain -c |
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174 |
rev chain# chainlen prev delta size rawsize chainsize ratio lindist extradist extraratio |
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175 |
0 1 1 -1 base 63 62 63 1.01613 63 0 0.00000 |
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176 |
1 2 1 -1 base 66 65 66 1.01538 66 0 0.00000 |
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177 |
|
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178 |
$ cat <<EOF > test.py |
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179 |
> from __future__ import print_function |
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180 |
> import sys |
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181 |
> from mercurial import changelog, vfs |
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182 |
> cl = changelog.changelog(vfs.vfs(sys.argv[1])) |
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183 |
> n0, n1 = cl.node(0), cl.node(1) |
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|
184 |
> ops = [ |
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185 |
> ('reachableroots', |
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186 |
> lambda: cl.index.reachableroots2(0, [1], [0], False)), |
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187 |
> ('compute_phases_map_sets', lambda: cl.computephases([[0], []])), |
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188 |
> ('index_headrevs', lambda: cl.headrevs()), |
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189 |
> ('find_gca_candidates', lambda: cl.commonancestorsheads(n0, n1)), |
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190 |
> ('find_deepest', lambda: cl.ancestor(n0, n1)), |
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191 |
> ] |
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192 |
> for l, f in ops: |
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193 |
> print(l + ':', end=' ') |
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194 |
> try: |
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195 |
> f() |
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196 |
> print('uncaught buffer overflow?') |
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197 |
> except ValueError as inst: |
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198 |
> print(inst) |
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199 |
> EOF |
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200 |
|
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201 |
$ "$PYTHON" test.py limit/.hg/store |
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202 |
reachableroots: parent out of range |
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203 |
compute_phases_map_sets: parent out of range |
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204 |
index_headrevs: parent out of range |
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205 |
find_gca_candidates: parent out of range |
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206 |
find_deepest: parent out of range |
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207 |
$ "$PYTHON" test.py neglimit/.hg/store |
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208 |
reachableroots: parent out of range |
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209 |
compute_phases_map_sets: parent out of range |
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210 |
index_headrevs: parent out of range |
9cdd525d97b2
revlog: fix out-of-bounds access by negative parents read from revlog (SEC)
Yuya Nishihara <yuya@tcha.org>
parents:
40369
diff
changeset
|
211 |
find_gca_candidates: parent out of range |
9cdd525d97b2
revlog: fix out-of-bounds access by negative parents read from revlog (SEC)
Yuya Nishihara <yuya@tcha.org>
parents:
40369
diff
changeset
|
212 |
find_deepest: parent out of range |
39707
5abc47d4ca6b
tests: quote PYTHON usage
Matt Harbison <matt_harbison@yahoo.com>
parents:
39282
diff
changeset
|
213 |
$ "$PYTHON" test.py segv/.hg/store |
26016
c8d41c9c23c7
reachableroots: unify bail cases to raise exception correctly
Yuya Nishihara <yuya@tcha.org>
parents:
25859
diff
changeset
|
214 |
reachableroots: parent out of range |
25810
82d6a35cf432
parsers: fix buffer overflow by invalid parent revision read from revlog
Yuya Nishihara <yuya@tcha.org>
parents:
16913
diff
changeset
|
215 |
compute_phases_map_sets: parent out of range |
82d6a35cf432
parsers: fix buffer overflow by invalid parent revision read from revlog
Yuya Nishihara <yuya@tcha.org>
parents:
16913
diff
changeset
|
216 |
index_headrevs: parent out of range |
82d6a35cf432
parsers: fix buffer overflow by invalid parent revision read from revlog
Yuya Nishihara <yuya@tcha.org>
parents:
16913
diff
changeset
|
217 |
find_gca_candidates: parent out of range |
82d6a35cf432
parsers: fix buffer overflow by invalid parent revision read from revlog
Yuya Nishihara <yuya@tcha.org>
parents:
16913
diff
changeset
|
218 |
find_deepest: parent out of range |
82d6a35cf432
parsers: fix buffer overflow by invalid parent revision read from revlog
Yuya Nishihara <yuya@tcha.org>
parents:
16913
diff
changeset
|
219 |
|
82d6a35cf432
parsers: fix buffer overflow by invalid parent revision read from revlog
Yuya Nishihara <yuya@tcha.org>
parents:
16913
diff
changeset
|
220 |
$ cd .. |
25859
1619563959b3
tests: disable test of buffer overflow in parsers.c if --pure
Yuya Nishihara <yuya@tcha.org>
parents:
25810
diff
changeset
|
221 |
|
1619563959b3
tests: disable test of buffer overflow in parsers.c if --pure
Yuya Nishihara <yuya@tcha.org>
parents:
25810
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changeset
|
222 |
#endif |