Bug#452789: xxd segfaults with large values for -c
James Vega
jamessan at debian.org
Sun Nov 25 23:12:01 UTC 2007
Bram,
Large values for the -c option (approximately 100 or greater) cause xxd
to segfault. Where the segfault occurs seems to vary based on how large the
columns option is.
I get this traceback when running "xxd -b -c 100 /usr/bin/xxd".
Program terminated with signal 11, Segmentation fault.
#0 0xb7e6ce0d in getc () from /lib/i686/cmov/libc.so.6
(gdb) bt full
#0 0xb7e4ce0d in getc () from /lib/i686/cmov/libc.so.6
No symbol table info available.
#1 0x0804a0a2 in main (argc=2, argv=0xbfb6e3c0) at xxd.c:731
fp = (FILE *) 0x2e04c008
fpo = (FILE *) 0xb7f344e0
c = 16
e = 127
p = 1
relseek = 1
negseek = 0
revert = 0
cols = 100
nonzero = 1
autoskip = 0
hextype = 3
ebcdic = 0
octspergrp = 1
grplen = 9
length = -1
n = 1
seekoff = 0
l = "0000000: 01111111", ' ' <repeats 889 times>
pname = 0xbfb6f984 "xxd"
pp = 0xbfb6f992 "/usr/bin/xxd"
#2 0xb7e01450 in __libc_start_main () from /lib/i686/cmov/libc.so.6
No symbol table info available.
#3 0x08048851 in _start ()
No symbol table info available.
Yet when running "xxd -b -c 1000 /usr/bin/xxd" I get the following.
Program terminated with signal 11, Segmentation fault.
#0 0x08049feb in main (argc=2, argv=0xbfc6acb0) at xxd.c:753
753 l[11 + (grplen * cols - 1)/octspergrp + p] =
(gdb) bt full
#0 0x08049feb in main (argc=2, argv=0xbfc6acb0) at xxd.c:753
fp = (FILE *) 0x804c008
fpo = (FILE *) 0xb7f354e0
c = 16
e = 127
p = 0
relseek = 1
negseek = 0
revert = 0
cols = 1000
nonzero = 0
autoskip = 0
hextype = 3
ebcdic = 0
octspergrp = 1
grplen = 9
length = -1
n = 0
seekoff = 0
l = "0000000: 01111111", ' ' <repeats 889 times>
pname = 0xbfc6b983 "xxd"
pp = 0xbfc6b992 "/usr/bin/xxd"
#1 0xb7e02450 in __libc_start_main () from /lib/i686/cmov/libc.so.6
No symbol table info available.
#2 0x08048851 in _start ()
No symbol table info available.
The above tracebacks were generated after building xxd with no optimizations.
James
--
GPG Key: 1024D/61326D40 2003-09-02 James Vega <jamessan at debian.org>
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