ipfw bug on i386

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Alex Keda

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Apr 11, 2010, 3:23:59 AM4/11/10
to freebsd...@freebsd.org
srv5# more /tmp/a.sh
table="24"
ipfw table $table flush
for octet3 in `jot - 1 60`
do
for octet4 in `jot - 1 254`
do
echo "table $table add 192.168.$octet3.$octet4" >> /tmp/$$.txt
done
done
ipfw /tmp/$$.txt
rm -f /tmp/$$.txt

effect:

srv5# sh /tmp/a.sh
Abort trap (core dumped)
srv5#
srv5# ll ipfw.core
-rw------- 1 root wheel - 1,9M 11 апр 11:22 ipfw.core
srv5#

Tested on 8,9 i386 - core dump, amd64 - all OK
7 - all OK

Hizel Ildar

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Apr 12, 2010, 2:07:56 AM4/12/10
to freebsd...@freebsd.org
В Sun, 11 Apr 2010 11:23:59 +0400
Alex Keda <ad...@lissyara.su> пишет:

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Hey! I'm fix this bug :D

patch:

foo# diff -ruN main.c~ main.c
--- main.c~ 2010-03-04 19:54:56.000000000 +0300
+++ main.c 2010-04-12 09:37:21.000000000 +0400
@@ -553,7 +553,7 @@
}

while (fgets(buf, BUFSIZ, f)) { /* read commands */
- char linename[10];
+ char linename[11];
char *args[2];

lineno++;

Hizel Ildar

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Apr 12, 2010, 2:12:52 AM4/12/10
to freebsd...@freebsd.org
В Mon, 12 Apr 2010 10:07:56 +0400
Hizel Ildar <hi...@vyborg.ru> пишет:

this is backtrace without my patch:
foo# gdb /sbin/ipfw ipfw.core
GNU gdb 6.1.1 [FreeBSD]
Copyright 2004 Free Software Foundation, Inc.
GDB is free software, covered by the GNU General Public License, and you are
welcome to change it and/or distribute copies of it under certain conditions.
Type "show copying" to see the conditions.
There is absolutely no warranty for GDB. Type "show warranty" for details.
This GDB was configured as "i386-marcel-freebsd"...
Core was generated by `ipfw'.
Program terminated with signal 6, Aborted.
Reading symbols from /lib/libutil.so.9...done.
Loaded symbols for /lib/libutil.so.9
Reading symbols from /lib/libc.so.7...done.
Loaded symbols for /lib/libc.so.7
Reading symbols from /libexec/ld-elf.so.1...done.
Loaded symbols for /libexec/ld-elf.so.1
#0 0x281eee1b in kill () at kill.S:3
3 RSYSCALL(kill)
(gdb) bt
#0 0x281eee1b in kill () at kill.S:3
#1 0x280e8ef5 in __fail (msg=0x281f3730 "stack overflow detected; terminated") at /usr/src/lib/libc/sys/stack_protector.c:95
#2 0x280e8f30 in __stack_chk_fail () at /usr/src/lib/libc/sys/stack_protector.c:102
#3 0x08057f44 in ipfw_readfile (ac=2, av=0xbfbfecac) at /usr/src/sbin/ipfw/main.c:581
#4 0x08057fca in main (ac=2, av=0xbfbfecac) at /usr/src/sbin/ipfw/main.c:606
Current language: auto; currently asm

foo# uname -a
FreeBSD foo.vyborg.ru 9.0-CURRENT FreeBSD 9.0-CURRENT #1: Sun Apr 11
21:00:05 MSD 2010 ro...@foo.vyborg.ru:/usr/obj/usr/src/sys/GENERIC
i386

Alex Keda

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Apr 12, 2010, 2:34:55 AM4/12/10
to freebsd...@freebsd.org
12.04.2010 10:07, Hizel Ildar пишет:
so, it limit 100k addresses in table?
with 7-STABLE I have more than 100k IP and all work correct
srv1# ipfw table 25 list | wc -l
104294
srv1# uname -a
FreeBSD srv1.host-food.ru 7.2-STABLE FreeBSD 7.2-STABLE #0: Sun Oct 4
01:38:34 MSD 2009
liss...@srv.host-food.ru:/home/obj/usr/src/sys/HOST-FOOD i386
srv1#

Andrey V. Elsukov

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Apr 12, 2010, 2:42:25 AM4/12/10
to Hizel Ildar, freebsd...@freebsd.org
On 12.04.2010 10:07, Hizel Ildar wrote:
> Hey! I'm fix this bug :D
>
> patch:
>
> foo# diff -ruN main.c~ main.c
> --- main.c~ 2010-03-04 19:54:56.000000000 +0300
> +++ main.c 2010-04-12 09:37:21.000000000 +0400
> @@ -553,7 +553,7 @@
> }
>
> while (fgets(buf, BUFSIZ, f)) { /* read commands */
> - char linename[10];
> + char linename[11];
> char *args[2];
>
> lineno++;

Can you test your it with 100k lines? :)
I think it can be fixed with something similar to:

- sprintf(linename, "Line %d", lineno);
+ snprintf(linename, sizeof(linename), "Line %d", lineno);

--
WBR, Andrey V. Elsukov

Hizel Ildar

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Apr 12, 2010, 3:15:45 AM4/12/10
to freebsd...@freebsd.org
В Mon, 12 Apr 2010 10:42:25 +0400
"Andrey V. Elsukov" <bu7...@yandex.ru> пишет:


and the variable linename will be incorrect information, it is necessary
to increase the linename to 16 at least

char linename[16]

Luigi Rizzo

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Apr 12, 2010, 4:39:35 AM4/12/10
to Hizel Ildar, freebsd...@freebsd.org
On Mon, Apr 12, 2010 at 11:15:45AM +0400, Hizel Ildar wrote:
> ?? Mon, 12 Apr 2010 10:42:25 +0400
> "Andrey V. Elsukov" <bu7...@yandex.ru> ??????????:

indeed. i just committed something like this, with a larger buffer.

thanks for the feedback
luigi

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