| lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
|
Open Source and information security mailing list archives
| ||
|
Date: Mon, 20 Apr 2009 13:47:08 +0200 From: John Hughes <john@...va.COM> To: linux-kernel@...r.kernel.org Subject: Am I allowed to call request_firmware_nowait from an interrupt handler? Just for fun I'm writing a driver for an old board I have lying around (a Brooktrout Netaccess PRI-PCI ISDN primary rate board). One of the amusing things it does it ask for various firmware modules when it's booting. As I receive these requests in the interrupt handler I'm trying to call request_firmware_nowait to do the download. But it complains: [ 167.058933] pri: pri0: board wants file I990803.PKG (rev ) for module 1d [ 167.058933] BUG: scheduling while atomic: swapper/0/0x00010000 [ 167.058933] [ 167.058933] Pid: 0, comm: swapper Not tainted (2.6.26-2-686 #1) [ 167.058933] EIP: 0060:[<c0114d68>] EFLAGS: 00000246 CPU: 1 [ 167.058933] EIP is at native_safe_halt+0x2/0x3 [ 167.058933] EAX: ef474000 EBX: c0102656 ECX: 0125b000 EDX: ffff6fbb [ 167.058933] ESI: 00000001 EDI: 00000000 EBP: 00000000 ESP: ef475fa8 [ 167.058933] DS: 007b ES: 007b FS: 00d8 GS: 0000 SS: 0068 [ 167.058933] CR0: 8005003b CR2: b7ee9264 CR3: 2e1c7000 CR4: 000006d0 [ 167.058933] DR0: 00000000 DR1: 00000000 DR2: 00000000 DR3: 00000000 [ 167.058933] DR6: ffff0ff0 DR7: 00000400 [ 167.058933] [<c0102683>] default_idle+0x2d/0x53 [ 167.058933] [<c01025ce>] cpu_idle+0xab/0xcb [ 167.058933] ======================= [ 167.058933] bad: scheduling from the idle thread! [ 167.058933] Pid: 0, comm: swapper Not tainted 2.6.26-2-686 #1 [ 167.058933] [<c011edc0>] dequeue_task_idle+0x1f/0x28 [ 167.058933] [<c011817f>] dequeue_task+0xa/0x14 [ 167.058933] [<c01181a4>] deactivate_task+0x1b/0x30 [ 167.058933] [<c02b7e43>] schedule+0x121/0x66d [ 167.058933] [<c01360ac>] getnstimeofday+0x37/0xbc [ 167.058933] [<c02b852f>] schedule_timeout+0x13/0x86 [ 167.058933] [<c0134556>] ktime_get+0xd/0x21 [ 167.058933] [<c0119132>] hrtick_start_fair+0xeb/0x12c [ 167.058933] [<c01188fe>] enqueue_task+0x52/0x5d [ 167.058933] [<c02b7c55>] wait_for_common+0xaf/0x10f [ 167.058933] [<c011b6ce>] default_wake_function+0x0/0x8 [ 167.058933] [<c0131810>] kthread_create+0x75/0xa8 [ 167.058933] [<f09a3331>] request_firmware_work_func+0x0/0x63 [firmware_class] [ 167.058933] [<f09a3704>] request_firmware_nowait+0x9c/0xe0 [firmware_class] [ 167.058933] [<f09a3331>] request_firmware_work_func+0x0/0x63 [firmware_class] [ 167.058933] [<f0a64725>] pri_download+0x0/0x247 [pri] [ 167.231311] [<f0a64608>] pri_interrupt+0x1fe/0x31b [pri] [ 167.235301] [<f0a64725>] pri_download+0x0/0x247 [pri] [ 167.235301] [<c015208e>] handle_IRQ_event+0x23/0x51 [ 167.235301] [<c015318d>] handle_fasteoi_irq+0x71/0xa4 [ 167.247302] [<c0105f3a>] do_IRQ+0x4d/0x63 [ 167.247302] [<c0102656>] default_idle+0x0/0x53 [ 167.247302] [<c01042a7>] common_interrupt+0x23/0x28 [ 167.247302] [<c0102656>] default_idle+0x0/0x53 [ 167.247302] [<c0114d68>] native_safe_halt+0x2/0x3 [ 167.247302] [<c0102683>] default_idle+0x2d/0x53 After that the system crashes: [ 167.247302] BUG: unable to handle kernel NULL pointer dereference at 00000000 [ 167.247302] IP: [<00000000>] [ 167.247302] *pde = 00000000 [ 167.247302] Oops: 0000 [#1] SMP [ 167.247302] Modules linked in: pri firmware_class ipv6 loop parport_pc parport snd_pcm snd_timer snd soundcore snd_page_alloc serio_raw button shpchp pcspkr pci_hotplug psmouse i2c_piix4 sworks_agp i2c_core agpgart dcdbas evdev ext3 jbd mbcache sd_mod ide_cd_mod cdrom sg ide_pci_generic serverworks ide_core aic7xxx ata_generic ohci_hcd scsi_transport_spi floppy libata e100 mii usbcore scsi_mod dock e1000 thermal processor fan thermal_sys [ 167.247302] [ 167.247302] Pid: 2, comm: kthreadd Not tainted (2.6.26-2-686 #1) [ 167.247302] EIP: 0060:[<00000000>] EFLAGS: 00010046 CPU: 0 [ 167.247302] EIP is at 0x0 [ 167.247302] EAX: c1615fa0 EBX: c02c4e20 ECX: 00000001 EDX: ef471500 [ 167.247302] ESI: ef471500 EDI: c1615fa0 EBP: 00000001 ESP: ef443f5c [ 167.247302] DS: 007b ES: 007b FS: 00d8 GS: 0000 SS: 0068 [ 167.247302] Process kthreadd (pid: 2, ti=ef442000 task=ef43f4e0 task.ti=ef442000) [ 167.247302] Stack: c01188fe c1615fa0 ef471500 00000001 c0118924 ef471500 c1615fa0 c011b68c [ 167.247302] 00000003 00000002 ef475e54 ef475e94 00000001 00000001 c01184a9 00000000 [ 167.247302] 00000003 ef475e9c ef475e98 ef475e9c 00000296 00000000 c011a618 00000000 [ 167.247302] Call Trace: [ 167.247302] [<c01188fe>] enqueue_task+0x52/0x5d [ 167.247302] [<c0118924>] activate_task+0x1b/0x26 [ 167.247302] [<c011b68c>] try_to_wake_up+0xaf/0xf1 [ 167.247302] [<c01184a9>] __wake_up_common+0x2e/0x58 [ 167.247302] [<c011a618>] complete+0x28/0x36 [ 167.247302] [<c0131773>] kthreadd+0x112/0x13a [ 167.247302] [<c0131661>] kthreadd+0x0/0x13a [ 167.247302] [<c01044f3>] kernel_thread_helper+0x7/0x10 [ 167.247302] ======================= [ 167.247302] Code: Bad EIP value. [ 167.247302] EIP: [<00000000>] 0x0 SS:ESP 0068:ef443f5c [ 167.247302] ---[ end trace 22fd0ce8ade70dbc ]--- [ 167.267303] [<c01025ce>] cpu_idle+0xab/0xcb [ 167.267303] ======================= Am I being a naughty boy? -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Powered by blists - more mailing lists