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SubjectRe: [ 88.628451] BUG: unable to handle kernel paging request at f8dbf000 "isight_firmware"
On Wed, 4 Jun 2008 19:13:46 +0000 "Justin Mattock" <justinmattock@gmail.com> wrote:
> Yesterday I compiled the isight_firmware module, and was happy with
> the result's, "no more udev",
> This morning I wasn't so lucky, upon a cold boot my system was stuck
> during boot, I tried numerous boot's but still the same results,
> luckily I was hoping to gather the info on what was going on here it is:
>
> [ 88.517109] firmware: requesting isight.fw
> [ 88.628451] BUG: unable to handle kernel paging request at f8dbf000
> [ 88.628463] IP: [<f8bc90f7>] :isight_firmware:isight_firmware_load+0xf2/0x1c3
> [ 88.628474] *pde = 375a8067 *pte = 00000000
> [ 88.628483] Oops: 0000 [#1] SMP
> [ 88.628490] Modules linked in: isight_firmware(+) hci_usb
> cpufreq_ondemand cpufreq_performance cpufreq_powersave rfcomm hidp
> l2cap bluetooth fan ipmi_watchdog ipmi_msghandler uvcvideo uinput
> wlan_tkip ieee80211_crypt_tkip ieee80211_crypt arpt_mangle
> arptable_filter arp_tables nf_conntrack_ipv4 nf_conntrack
> iptable_mangle iptable_filter ip_tables x_tables i2c_i810 i2c_algo_bit
> coretemp eeprom acpi_cpufreq fglrx(P) agpgart appletouch joydev
> applesmc wlan_scan_sta firewire_ohci firewire_core ath_rate_sample
> snd_hda_intel snd_pcm ath_pci ohci1394 snd_timer snd_page_alloc
> snd_hwdep wlan ieee1394 ath_hal(P) evdev ehci_hcd uhci_hcd pata_acpi
> button thermal video processor
> [ 88.628581]
> [ 88.628587] Pid: 2568, comm: modprobe Tainted: P
> (2.6.26-rc4-00173-gd53a1a8 #6)

there's the kernel version

> [ 88.628593] EIP: 0060:[<f8bc90f7>] EFLAGS: 00010207 CPU: 0
> [ 88.628600] EIP is at isight_firmware_load+0xf2/0x1c3 [isight_firmware]
> [ 88.628606] EAX: f2120150 EBX: 00000032 ECX: 0000000a EDX: c17f5638
> [ 88.628610] ESI: f8dbf000 EDI: f2120158 EBP: f2111dac ESP: f2111d7c
> [ 88.628615] DS: 007b ES: 007b FS: 00d8 GS: 0033 SS: 0068
> [ 88.628621] Process modprobe (pid: 2568, ti=f2110000 task=f5495380
> task.ti=f2110000)
> [ 88.628625] Stack: 00003def f2120150 f5728c90 00000578 f8dbeff8
> c02b3854 f5728ff8 00006743
> [ 88.628640] f492c700 f571ef50 f8bc97c4 f8bc9750 f2111dc8
> c02b42d4 f5728c90 00000000
> [ 88.628654] f571ef6c 00000000 f8bc9790 f2111ddc c026e58e
> f571ef6c f571f054 f8bc9790
> [ 88.628667] Call Trace:
> [ 88.628676] [<c02b3854>] ? usb_autopm_do_device+0xb1/0xb9
> [ 88.628694] [<c02b42d4>] ? usb_probe_interface+0xc0/0xee
> [ 88.628707] [<c026e58e>] ? driver_probe_device+0xa0/0x11b
> [ 88.628720] [<c026e646>] ? __driver_attach+0x3d/0x5f
> [ 88.628731] [<c026ddea>] ? bus_for_each_dev+0x3b/0x5d
> [ 88.628744] [<c026e425>] ? driver_attach+0x14/0x16
> [ 88.628753] [<c026e609>] ? __driver_attach+0x0/0x5f
> [ 88.628762] [<c026e180>] ? bus_add_driver+0x9a/0x1aa
> [ 88.628775] [<c026e7c3>] ? driver_register+0x71/0xcd
> [ 88.628783] [<c016427e>] ? __vunmap+0x93/0x9b
> [ 88.628797] [<c02b3f01>] ? usb_register_driver+0x71/0xcb
> [ 88.628808] [<f8be6017>] ? isight_firmware_init+0x17/0x19 [isight_firmware]
> [ 88.628818] [<c0140d4a>] ? sys_init_module+0x163c/0x17ea
> [ 88.628835] [<c020fe2e>] ? prio_tree_insert+0x1c/0x1cb
> [ 88.628854] [<c0160f21>] ? vma_link+0xc0/0xce
> [ 88.628866] [<c0161597>] ? mmap_region+0x2ca/0x377
> [ 88.628877] [<c016ec1c>] ? __kmalloc+0x0/0xdb
> [ 88.628905] [<c01038fa>] ? syscall_call+0x7/0xb
> [ 88.628925] =======================
> [ 88.628928] Code: e9 8e 00 00 00 83 7d d0 32 bb 32 00 00 00 0f 4e
> 5d d0 ba d0 00 00 00 89 d8 e8 32 5b 5a c7 89 d9 8b 75 e0 c1 e9 02 89
> 45 d4 89 c7 <f3> a5 89 d9 83 e1 03 74 02 f3 a4 8b 45 d8 b9 a0 00 00 00
> 8b 10
> [ 88.629002] EIP: [<f8bc90f7>] isight_firmware_load+0xf2/0x1c3
> [isight_firmware] SS:ESP 0068:f2111d7c
> [ 88.629015] ---[ end trace 0d6c893753a1cd98 ]---
>
> like I said yesterday there was no problem at all, maybe because the
> system was warm from being on all day.
> after renaming isight_firmware.ko so I can boot up the system runs fine.
> hope this helps in the kernel development.
> regards;

I get this:

y:/usr/src/25> AFLAGS=--32 /bin/sh scripts/decodecode < ~/x
Code: e9 8e 00 00 00 83 7d d0 32 bb 32 00 00 00 0f 4e 5d d0 ba d0 00 00 00 89 d8 e8 32 5b 5a c7 89 d9 8b 75 e0 c1 e9 02 89 45 d4 89 c7 <f3> a5 89 d9 83 e1 03 74 02 f3 a4 8b 45 d8 b9 a0 00 00 00 8b 10

/tmp/tmp.QXepc15200.o: file format elf32-i386

Disassembly of section .text:

00000000 <.text>:
0: e9 8e 00 00 00 jmp 0x93
5: 83 7d d0 32 cmpl $0x32,-0x30(%ebp)
9: bb 32 00 00 00 mov $0x32,%ebx
e: 0f 4e 5d d0 cmovle -0x30(%ebp),%ebx
12: ba d0 00 00 00 mov $0xd0,%edx
17: 89 d8 mov %ebx,%eax
19: e8 32 5b 5a c7 call 0xc75a5b50
1e: 89 d9 mov %ebx,%ecx
20: 8b 75 e0 mov -0x20(%ebp),%esi
23: c1 e9 02 shr $0x2,%ecx
26: 89 45 d4 mov %eax,-0x2c(%ebp)
29: 89 c7 mov %eax,%edi
/tmp/tmp.QXepc15200.o: file format elf32-i386

Disassembly of section .text:

00000000 <.text>:
0: f3 a5 rep movsl %ds:(%esi),%es:(%edi)
2: 89 d9 mov %ebx,%ecx
4: 83 e1 03 and $0x3,%ecx
7: 74 02 je 0xb
9: f3 a4 rep movsb %ds:(%esi),%es:(%edi)
b: 8b 45 d8 mov -0x28(%ebp),%eax
e: b9 a0 00 00 00 mov $0xa0,%ecx
13: 8b 10 mov (%eax),%edx

So at a guess I'd say that firnware->data is garbage (esi=f8dbf000).
But I didn't try very hard.

btw,

: static int isight_firmware_load(struct usb_interface *intf,
: const struct usb_device_id *id)
: {
: struct usb_device *dev = interface_to_usbdev(intf);
: int llen, len, req, ret = 0;
: const struct firmware *firmware;
: unsigned char *buf;
: unsigned char data[4];
: const u8 *ptr;
:
: if (request_firmware(&firmware, "isight.fw", &dev->dev) != 0) {
: printk(KERN_ERR "Unable to load isight firmware\n");
: return -ENODEV;
: }
:
: ptr = firmware->data;
:
: if (usb_control_msg
: (dev, usb_sndctrlpipe(dev, 0), 0xa0, 0x40, 0xe600, 0, "\1", 1,
: 300) != 1) {
: printk(KERN_ERR
: "Failed to initialise isight firmware loader\n");
: ret = -ENODEV;
: goto out;
: }
:
: while (1) {
: memcpy(data, ptr, 4);
: len = (data[0] << 8 | data[1]);
: req = (data[2] << 8 | data[3]);
: ptr += 4;
:
: if (len == 0x8001)
: break; /* success */
: else if (len == 0)
: continue;

This looks like it can overrun the buffer and go oops if we were given
unexpected data.


: for (; len > 0; req += 50) {
: llen = len > 50 ? 50 : len;

min()

: len -= llen;
:
: buf = kmalloc(llen, GFP_KERNEL);
: memcpy(buf, ptr, llen);
:
: ptr += llen;
:
: if (usb_control_msg
: (dev, usb_sndctrlpipe(dev, 0), 0xa0, 0x40, req, 0,
: buf, llen, 300) != llen) {
: printk(KERN_ERR
: "Failed to load isight firmware\n");
: kfree(buf);
: ret = -ENODEV;
: goto out;
: }
:
: kfree(buf);

Could just kmalloc a single 50-byte buffer and then reuse it multiple times.

: }
: }
: if (usb_control_msg
: (dev, usb_sndctrlpipe(dev, 0), 0xa0, 0x40, 0xe600, 0, "\0", 1,
: 300) != 1) {
: printk(KERN_ERR "isight firmware loading completion failed\n");
: ret = -ENODEV;
: }
: out:
: release_firmware(firmware);
: return ret;
: }



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