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author | Jim Meyering <jim@meyering.net> | 2012-07-03 17:32:33 +0800 |
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committer | Herbert Xu <herbert@gondor.apana.org.au> | 2012-07-03 17:32:33 +0800 |
commit | f748bf12720bb350d3d8a2dbdf00fb47c9b90720 (patch) | |
tree | 60d04dbb3ceb57859d1587632160e77d1ead39b0 /src/bltin/test.c | |
parent | [VAR] Sanitise environment variable names on entry (diff) | |
download | dash-f748bf12720bb350d3d8a2dbdf00fb47c9b90720.tar.gz dash-f748bf12720bb350d3d8a2dbdf00fb47c9b90720.zip |
Avoid overflow for very long variable name
Otherwise, this: $ perl -le 'print "v"x(2**31+1) ."=1"' | dash provokes integer overflow: (gdb) bt #0 doformat (dest=0x61d580, f=0x416a08 "%s: %d: %s: ", ap=0x7fffffffd308) at output.c:310 #1 0x00000000004128c1 in outfmt (file=0x61d580, fmt=0x416a08 "%s: %d: %s: ") at output.c:257 #2 0x000000000040382e in exvwarning2 (msg=0x417339 "Out of space", ap=0x7fffffffd468) at error.c:125 #3 0x000000000040387e in exverror (cond=1, msg=0x417339 "Out of space", ap=0x7fffffffd468) at error.c:156 #4 0x0000000000403938 in sh_error (msg=0x417339 "Out of space") at error.c:172 #5 0x000000000040c970 in ckmalloc (nbytes=18446744071562067984) at memalloc.c:57 #6 0x000000000040ca78 in stalloc (nbytes=18446744071562067972) at memalloc.c:132 #7 0x000000000040ece9 in grabstackblock (len=18446744071562067972) at memalloc.h:67 #8 0x00000000004106b5 in readtoken1 (firstc=118, syntax=0x419522 "", eofmark=0x0, striptabs=0) at parser.c:1040 #9 0x00000000004101a4 in xxreadtoken () at parser.c:826 #10 0x000000000040fe1d in readtoken () at parser.c:697 #11 0x000000000040edcc in parsecmd (interact=0) at parser.c:145 #12 0x000000000040c679 in cmdloop (top=1) at main.c:224 #13 0x000000000040c603 in main (argc=2, argv=0x7fffffffd9f8) at main.c:178 #8 0x00000000004106b5 in readtoken1 (firstc=118, syntax=0x419522 "", eofmark=0x0, striptabs=0) at parser.c:1040 1040 grabstackblock(len); (gdb) p len $30 = -2147483644 Signed-off-by: Jim Meyering <meyering@redhat.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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