Re: Difference between process & kernel module

[Stephane List <slist@xxxxxxxxxxx>]

Thanks for the link,

CONFIG_DEBUG_STACKOVERFLOW is available for 386 and ppc64 only, I was looking for the same thing but for arm processor.

Stephane


Brandon Niemczyk wrote:

> apparently my post is a bit wrong, see Gaurav's posts.
>
> That said, I found the following in arch/i386/kernel/irq.c
>
> #ifdef CONFIG_DEBUG_STACKOVERFLOW
>        /* Debugging check for stack overflow: is there less than 1KB free? */
>        {
>                long esp;
>
>                __asm__ __volatile__("andl %%esp,%0" :
>                                        "=r" (esp) : "0" (THREAD_SIZE - 1));
>                if (unlikely(esp < (sizeof(struct thread_info) + STACK_WARN))) {
>                        printk("do_IRQ: stack overflow: %ld\n",
>                                esp - sizeof(struct thread_info));
>                        dump_stack();
>                }
>        }
> #endif
>
> is that what you are looking for?
>
> On Wed, 29 Sep 2004 11:24:49 +0200, Stephane List <slist@xxxxxxxxxxx> wrote:
>  
>
> > > IIUC a kernel module uses the kernel's stack and heap.  And because of
> > > this modules which use a lot of stack space can cause some serious
> > > problems.
> > >
> > >
> > >
> > >      
> > Does Linux provide a mecanism to panic in case of stack or heap overflow ?
> > If I run Linux in an emulator, is there a thing I could trace to detect
> > such problem ?
> >
> > Thanks
> >
> > Stephane
> >
> >
> >
> > --
> > Kernelnewbies: Help each other learn about the Linux kernel.
> > Archive:       http://mail.nl.linux.org/kernelnewbies/
> > FAQ:           http://kernelnewbies.org/faq/
> >
> >
> >    
>
>
>
>  


--
Kernelnewbies: Help each other learn about the Linux kernel.
Archive:       http://mail.nl.linux.org/kernelnewbies/
FAQ:           http://kernelnewbies.org/faq/