Re: Trying to convert old modules to newer kernels

From: linux-os (Dick Johnson)
Date: Wed Dec 19 2007 - 15:57:31 EST



On Wed, 19 Dec 2007, Lennart Sorensen wrote:

> On Wed, Dec 19, 2007 at 03:10:28PM -0500, linux-os (Dick Johnson) wrote:
>>
>>
>> Here is a so-called BUG when trying to insert the following
>> module into the kernel (2.6.22.1).
>>
>>
>> BUG: unable to handle kernel paging request at virtual address 6814ec83
>> printing eip:
>> c016d013
>> *pde = 00000000
>> Oops: 0000 [#1]
>> PREEMPT SMP
>> Modules linked in: MemDev parport_pc lp parport nfsd exportfs lockd sunrpc iptable_filter ip_tables x_tables e1000 e100 mii nls_cp437 msdos fat dm_mod usbhid ff_memless uhci_hcd ehci_hcd video container button battery ac rtc ipv6 ext3 jbd ata_piix libata aic7xxx scsi_transport_spi sd_mod scsi_mod
>> CPU: 0
>> EIP: 0060:[<c016d013>] Not tainted VLI
>> EFLAGS: 00010046 (2.6.22.1 #2)
>> EIP is at kmem_cache_alloc+0x23/0x80
>> eax: 00000000 ebx: 00000246 ecx: f8913300 edx: 6814ec83
>> esi: 00000000 edi: f8913000 ebp: ef27e000 esp: ef27ff74
>> ds: 007b es: 007b fs: 00d8 gs: 0033 ss: 0068
>> Process insmod (pid: 4593, ti=ef27e000 task=f614f550 task.ti=ef27e000)
>> Stack: f8913300 00000000 00000000 f8913013 f7fff880 000000d0 00000000 ef27e000
>> c012b907 ffffffff 00000000 c0140279 bffedc07 bffedc08 0807a018 00000000
>> c0102b82 0807a018 000018c9 0807a008 00000000 00000000 bffeabc8 00000080
>> Call Trace:
>> [<f8913013>] init_module+0x13/0x48 [MemDev]
>> [<c012b907>] blocking_notifier_call_chain+0x17/0x20
>> [<c0140279>] sys_init_module+0xd9/0x140
>> [<c0102b82>] sysenter_past_esp+0x5f/0x85
>> =======================
>> Code: 90 8d b4 26 00 00 00 00 83 ec 0c f6 c2 10 89 74 24 04 89 d6 89 7c 24 08 89 c7 89 1c 24 75 49 9c 5b fa 64 a1 04 20 47 c0 8b 14 87 <8b> 02 85 c0 74 25 c7 42 0c 01 00 00 00 48 89 02 8b 54 82 18 53
>> EIP: [<c016d013>] kmem_cache_alloc+0x23/0x80 SS:ESP 0068:ef27ff74
>>
>>
>>
>> Here is the code that causes the crash.
>>
>>
>> #include <linux/autoconf.h>
>> #include <linux/module.h>
>> #include <linux/kernel.h>
>> #include <linux/init.h>
>> #include <linux/poll.h>
>> #include <linux/mm.h>
>> static const char devname[]="Device";
>> #define NR_PAGES 0x10
>>
>> struct DMA {
>> void *ptr;
>> unsigned long addr;
>> size_t len;
>> };
>> //-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
>> //
>> // The top-level object that gets allocated once, when the module is
>> // installed.
>> //
>> struct INFO {
>> struct file_operations fa; // Kernel connection
>> struct semaphore dev_sem;
>> struct DMA dma[NR_PAGES]; // Can map one megabyte
>> uint32_t vm_start; // Where mmap() starts
>> uint32_t pages; // Number of pages mapped
>> atomic_t open; // Number of opens
>> };
>> //-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
>> static struct INFO *info;
>> //-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
>> //
>> // Initialize the module and return 0 if everything is okay.
>> // Return a negative error-code if not.
>> //
>> static int32_t startup()
>> {
>> if((info = kmalloc(sizeof(struct INFO), GFP_KERNEL)) == NULL) {
>> printk(KERN_ALERT"%s : Can't allocate memory\n", devname);
>
> Missing space after KERN_ALERT?

I certainly hope that it's not the problem! That would
invalidate both the kernel and the compiler!


>
> --
> Len Sorensen
>

Cheers,
Dick Johnson
Penguin : Linux version 2.6.22.1 on an i686 machine (5588.28 BogoMips).
My book : http://www.AbominableFirebug.com/
_


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