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Date: Wed, 17 Sep 2014 21:51:09 -0400 From: Sasha Levin <sasha.levin@...cle.com> To: Kees Cook <keescook@...omium.org>, linux-kernel@...r.kernel.org CC: Ming Lei <ming.lei@...onical.com>, "Luis R. Rodriguez" <mcgrof@...e.com>, Greg Kroah-Hartman <gregkh@...uxfoundation.org>, James Morris <james.l.morris@...cle.com>, David Howells <dhowells@...hat.com>, linux-doc@...r.kernel.org, linux-security-module@...r.kernel.org, linux-firmware@...nel.org, linux-wireless <linux-wireless@...r.kernel.org>, Dave Jones <davej@...hat.com> Subject: Re: [PATCH 2/7] test: add firmware_class loader test On 07/14/2014 05:38 PM, Kees Cook wrote: > This provides a simple interface to trigger the firmware_class loader > to test built-in, filesystem, and user helper modes. Additionally adds > tests via the new interface to the selftests tree. > > Signed-off-by: Kees Cook <keescook@...omium.org> Hi folks, While fuzzing with trinity inside a KVM tools guest running the latest -next kernel, I've stumbled on the following spew: [ 413.999779] misc test_firmware: Falling back to user helper [ 414.003728] WARNING: CPU: 25 PID: 9860 at lib/kobject.c:209 kobject_add_internal+0x3a3/0x450() [ 414.006815] kobject: (ffff8807b4ef5dc8): attempted to be registered with empty name! [ 414.009482] Modules linked in: [ 414.010818] CPU: 25 PID: 9860 Comm: trinity-c662 Tainted: G W 3.17.0-rc5-next-20140917-sasha-00041-gd01267b #1198 [ 414.014626] 0000000000000009 ffff880236547a68 ffffffff9d56d655 0000000000000000 [ 414.017585] ffff880236547ab8 ffff880236547aa8 ffffffff9a15f3d1 00000000001e3540 [ 414.020733] ffff8807b4ef5dc8 00000000ffffffea ffff88043d114108 ffff8807b4ef5db8 [ 414.023345] Call Trace: [ 414.024254] dump_stack (lib/dump_stack.c:52) [ 414.026232] warn_slowpath_common (kernel/panic.c:432) [ 414.028355] warn_slowpath_fmt (kernel/panic.c:446) [ 414.030366] ? __raw_spin_lock_init (kernel/locking/spinlock_debug.c:24) [ 414.032369] kobject_add_internal (lib/kobject.c:211 (discriminator 1)) [ 414.034313] ? __dynamic_pr_debug (lib/dynamic_debug.c:561) [ 414.036254] kobject_add (lib/kobject.c:403) [ 414.038017] ? device_private_init (drivers/base/core.c:929) [ 414.040340] ? klist_init (lib/klist.c:90) [ 414.044729] device_add (drivers/base/core.c:1010) [ 414.049854] ? dev_set_name (drivers/base/core.c:876) [ 414.060790] _request_firmware (drivers/base/firmware_class.c:892 drivers/base/firmware_class.c:957 drivers/base/firmware_class.c:1139) [ 414.062814] request_firmware (drivers/base/firmware_class.c:1189) [ 414.064796] trigger_request_store (lib/test_firmware.c:68) [ 414.066774] dev_attr_store (drivers/base/core.c:138) [ 414.068531] sysfs_kf_write (fs/sysfs/file.c:115) [ 414.070826] kernfs_fop_write (fs/kernfs/file.c:308) [ 414.074648] ? kernfs_vma_page_mkwrite (fs/kernfs/file.c:267) [ 414.076864] do_loop_readv_writev (fs/read_write.c:710) [ 414.078947] ? kernfs_vma_page_mkwrite (fs/kernfs/file.c:267) [ 414.081269] do_readv_writev (fs/read_write.c:842) [ 414.083281] ? preempt_count_sub (kernel/sched/core.c:2634) [ 414.085380] ? mutex_lock_nested (./arch/x86/include/asm/preempt.h:98 kernel/locking/mutex.c:599 kernel/locking/mutex.c:616) [ 414.087401] ? __fdget_pos (fs/file.c:714) [ 414.089286] vfs_writev (fs/read_write.c:881) [ 414.091243] SyS_writev (fs/read_write.c:914 fs/read_write.c:905) [ 414.093053] tracesys_phase2 (arch/x86/kernel/entry_64.S:529) Thanks, Sasha -- 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/
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