i tried ur code on
kernel 2.4.18-14: gave me same error
kernel 2.4.2-2: it worked
when i do
$grep -r 'sys_call_table' /usr/src/linux
i see
in kernel 2.4.2-2
/usr/src/linux/kernel/ksyms.c : EXPORT_SYMBOL(
sys_call_table)
in kernel 2.4.18-14
i dont see that
thats the reason y u r getting a
'unresolved symbol error'
check out what is to be done for that...
-troy
--- Linux Handsome <[EMAIL PROTECTED]> wrote:
> Hello friends
> Friends in the below mentioned
> program i
> am intercepting makedir system call
> so that user would not be able to make
> any directories . But i am getting "
> unresolved sysmbol sys_call_table "
> error while inserting the module
> .Plz help me 2 resolve it .
> Thanks a lot .
> My kernel version is 2.4.18.14 .
> gcc -DMODULE -D__KERNEL__
> -I/usr/src/linux-2.4.18-14/include -Wall -O2 -c
> nodir.c -o
> nodir.o
>
> /* program nodir.c */
> #include <linux/version.h>
> #include <linux/module.h>
> #include <linux/kernel.h>
> #include <linux/smp_lock.h>
> #include <linux/sched.h>
> #include <linux/unistd.h>
> #include <linux/string.h>
> #include <linux/file.h>
> #include <asm/uaccess.h>
> #include <linux/proc_fs.h>
> #include <asm/errno.h>
> #include <asm/io.h>
> #include <sys/syscall.h>
>
> extern void* sys_call_table[];
> /*sys_call_table is exported, so we
> can access it*/
>
>
> int (*orig_mkdir)(const char *path); /*the original
> systemcall*/
>
>
> int hacked_mkdir(const char *path)
> {
> return 0; /*everything is
> ok, but he new systemcall
> does nothing*/
> }
>
> int init_module(void) /*module
> setup*/
> {
> orig_mkdir=sys_call_table[__NR_mkdir];
> sys_call_table[__NR_mkdir]=hacked_mkdir;
> return 0;
> }
>
> void cleanup_module(void) /*module
> shutdown*/
> {
> sys_call_table[__NR_mkdir]=orig_mkdir; /*set mkdir
> syscall to the origal
> one*/
> }
>
> MODULE_LICENSE("GPL");
>
>
>
>
> =====
> [EMAIL PROTECTED]
> We all have ability. The difference is how we use
> it.
>
> __________________________________
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