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| author | Jim Meyering <jim@meyering.net> | 2012-07-03 17:32:33 +0800 |
|---|---|---|
| committer | Herbert Xu <herbert@gondor.apana.org.au> | 2012-07-03 17:32:33 +0800 |
| commit | f748bf12720bb350d3d8a2dbdf00fb47c9b90720 (patch) | |
| tree | 60d04dbb3ceb57859d1587632160e77d1ead39b0 /src/bltin/echo.1 | |
| 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>
Diffstat (limited to '')
0 files changed, 0 insertions, 0 deletions