netfilter buglog - Apr 2003 - [Bug 85] New: couldn't write file ,call syscall ,ex. sys_open

https://bugzilla.netfilter.org/cgi-bin/bugzilla/show_bug.cgi?id=85

           Summary: couldn't write file ,call syscall ,ex. sys_open
           Product: netfilter/iptables
           Version: linux-2.4.x
          Platform: i386
        OS/Version: RedHat Linux
            Status: NEW
          Severity: major
          Priority: P2
         Component: ip_tables (kernel)
        AssignedTo: zpeak@163.com
        ReportedBy: zpeak@163.com
                CC: netfilter-buglog@lists.netfilter.org


Hello:
    I program the firewall used the iptable under linux ,The kernel is 2.4.18 ,
I coun't call the system call ,example sys_open ,sys_close, 
The problem is i could't write file ,what can i do ,
 
the error is :
 
error .... 
kernel panic :Aiee,killing interrupt handler! 
In interrupt handler - not syncing 

    Please help me ,Thank you .
                                                            yours zpeak 
                                                            
 
/*------------------------------------------------------------------------------
-----------------------
 *Atteched the source and the problem 
--------------------------------------------------------------------------------
--------------------*/
#ifndef __KERNEL__
#define __KERNEL__
#endif
#ifndef MODULE
#define MODULE
#endif
 
#include <linux/module.h>
#include <linux/skbuff.h>
#include <linux/netdevice.h>
#include <linux/config.h>
#include <linux/ip.h>
#include <linux/tcp.h>
#include <linux/udp.h>
#include <linux/spinlock.h>
#include <asm-i386/segment.h>
#include <asm-i386/uaccess.h>
#include <linux/netfilter_ipv4.h>

 
 

static unsigned int myfirewall(unsigned int hooknum,struct sk_buff **skb,
  const struct net_device *in,
  const struct net_device *out,int (*okfn)(struct sk_buff*))
{
 mm_segment_t old_fs =get_fs() ;
 mm_segment_t new_fs =get_ds();
 printk("The old fs is [%lu]\n",old_fs.seg) ;
 printk("The neww fs is [%lu]\n ",new_fs.seg) ;

/* I found the old_fs and  new_fs is in the same address  
  * But in other module is different ,why,can you tell me 
*/ 
 
 
 int fd = 0;
 char pathname[50] ="/test/log/8.mail" ;
 
set_fs(new_fs) ;
 
 fd = sys_open(pathname,O_WRONLY|O_CREAT,S_IRUSR|S_IWUSR);
 printk("fd is [%d]",fd);
 sys_write(fd,"Mail has develope sucesses , ",20) ; 
 sys_close(fd);
 
set_fs(old_fs) ;
 
 
 return NF_ACCEPT;

}
 
static struct nf_hook_ops iplimitfilter{
 {NULL,NULL},
 myfirewall,
 PF_INET,
 NF_IP_PRE_ROUTING,
 NF_IP_PRI_FILTER
};
 
int init_module(void)
{
 mm_segment_t old_fs =get_fs() ;
 mm_segment_t new_fs =get_ds();
 printk("The** old fs is [%lu]\n",old_fs.seg) ;
 printk("The** neww fs is [%lu]\n ",new_fs.seg) ;
 return nf_register_hook(&iplimitfilter);
}
 
void cleanup_module(void)
{
 nf_unregister_hook(&iplimitfilter);
}
 
------------------------------------------------------------
gcc -D__KERNEL__ -WALL -I /usr/src/linux.2.4.18/include  myfirewall.c



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