> char path[1024];
Probably your array is overflowing the stack.
- KK
|---------+------------------------------->
| | "Adam Flizikowski" |
| | <adam_fli@poczta.one|
| | t.pl> |
| | Sent by: |
| | linux-net-owner@vger|
| | .kernel.org |
| | |
| | |
| | 07/13/2003 10:05 AM |
| | |
|---------+------------------------------->
>-----------------------------------------------------------------------------------------------------------------|
| |
| To: <linux-net@vger.kernel.org> |
| cc: |
| Subject: dev.c question - 100 points for one who knows where is the problem |
| |
>-----------------------------------------------------------------------------------------------------------------|
Hi,
i am fithting with this all day.
i have modified dev.c code to be able to dump some details on packet
processing.
I did this in the code:
... added include after the original includes block
// *********************************************
#include <asm/spinlock.h>
// *********************************************
... somewhere in the file i put
// *********************************************
#define ELEMENT_MAX 256
#define write(f, buf, sz) (f->f_op->write(f, buf, sz, &f->f_pos))
struct element {
int data[16];
};
struct element *ptr;
unsigned int c_element = 0;
int c_swap = 0;
void af_add(struct element t) {
int i;
struct file *f;
char path[1024];
spinlock_t af_add_lock = SPIN_LOCK_UNLOCKED;
spin_lock(&af_add_lock);
if (!c_swap) {
c_swap = 1;
ptr = kmalloc(ELEMENT_MAX * sizeof(struct element),
GFP_KERNEL);
if (!ptr) {
printk("nie moge zaalokowac wystarczajacej ilosci
pamieci..\n");
c_swap = 0;
}
}
if ((c_element + 1) != ELEMENT_MAX)
memcpy(ptr + c_element, &t, sizeof(struct element));
else {
set_fs(KERNEL_DS);
// snprintf(path, sizeof(path), "/tmp/log-%d", c_swap);
snprintf(path, sizeof(path), "/tmp/dumplog");
f = filp_open(path, O_CREAT | O_APPEND, 00600);
printk("write: %d\n", write(f, (void *) ptr, sizeof(struct element)
* ELEMENT_MAX));
filp_close(f, 0);
set_fs(USER_DS);
c_element = 0;
}
c_element++;
spin_unlock(&af_add_lock);
}
// *********************************************
..and finally put a call to af_add function inside >int __init
net_dev_init(void){}< function
int __init net_dev_init(void)
{
....
struct element test;
int ii;
for(ii=0; ii<4; ii+)af_add(test);
//****************************
af_add function should put some test values into kmallocated memory, but
when there is no room in the memory it should do kind of swap....
When i recompile kernel, while booting i get kernel oops saying:
that it failed before
>>f = filp_open(path, O_CREAT | O_APPEND, 00600);
line. (i just put printk() before this line, so this is the last
information
that is printed to stdout).
PLEASE help
regards
adam
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