On Friday, February 24, 2017 08:52:42 PM Seunghun Han wrote: > Hi, Lv Zheng. > > I added my handcrafted ACPI table under your request, because > "acpidump -c on" and "acpidump -c off" doesn't work. > > 2017-02-21 19:36 GMT+09:00 Seunghun Han <kkama...@gmail.com>: > > Hello, > > > > I attached the test results below, > > > > 2017-02-21 9:53 GMT+09:00 Rowafael J. Wysocki <r...@rjwysocki.net>: > >> On Tuesday, February 21, 2017 12:33:08 AM Zheng, Lv wrote: > >>> Hi, > >>> > >>> > From: linux-acpi-ow...@vger.kernel.org > >>> > [mailto:linux-acpi-ow...@vger.kernel.org] On Behalf Of Seunghun > >>> > Han > >>> > Subject: [PATCH v2] acpi: acpica: fix acpi operand cache leak > >>> > > >>> > I'm Seunghun Han, and I work for National Security Research Institute of > >>> > South Korea. > >>> > > >>> > I have been doing a research on ACPI and making a handcrafted ACPI table > >>> > for my research. > >>> > Errors of handcrafted ACPI tables are handled well in Linux kernel > >>> > while boot > >>> > process, and Linux kernel goes well without critical problems. > >>> > But I found some ACPI operand cache leaks in ACPI early abort cases. > >>> > > >>> > Boot log of ACPI operand cache leak is as follows: > >>> > >[ 0.174332] ACPI: Added _OSI(Module Device) > >>> > >[ 0.175504] ACPI: Added _OSI(Processor Device) > >>> > >[ 0.176010] ACPI: Added _OSI(3.0 _SCP Extensions) > >>> > >[ 0.177032] ACPI: Added _OSI(Processor Aggregator Device) > >>> > >[ 0.178284] ACPI: SCI (IRQ16705) allocation failed > >>> > >[ 0.179352] ACPI Exception: AE_NOT_ACQUIRED, Unable to install > >>> > >System Control Interrupt handler > >>> > (20160930/evevent-131) > >>> > >[ 0.180008] ACPI: Unable to start the ACPI Interpreter > >>> > >[ 0.181125] ACPI Error: Could not remove SCI handler > >>> > >(20160930/evmisc-281) > >>> > >[ 0.184068] kmem_cache_destroy Acpi-Operand: Slab cache still has > >>> > >objects > >>> > >[ 0.185358] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 4.10.0-rc3 #2 > >>> > >[ 0.186820] Hardware name: innotek GmbH VirtualBox/VirtualBox, BIOS > >>> > >VirtualBox 12/01/2006 > >>> > >[ 0.188000] Call Trace: > >>> > >[ 0.188000] ? dump_stack+0x5c/0x7d > >>> > >[ 0.188000] ? kmem_cache_destroy+0x224/0x230 > >>> > >[ 0.188000] ? acpi_sleep_proc_init+0x22/0x22 > >>> > >[ 0.188000] ? acpi_os_delete_cache+0xa/0xd > >>> > >[ 0.188000] ? acpi_ut_delete_caches+0x3f/0x7b > >>> > >[ 0.188000] ? acpi_terminate+0x5/0xf > >>> > >[ 0.188000] ? acpi_init+0x288/0x32e > >>> > >[ 0.188000] ? __class_create+0x4c/0x80 > >>> > >[ 0.188000] ? video_setup+0x7a/0x7a > >>> > >[ 0.188000] ? do_one_initcall+0x4e/0x1b0 > >>> > >[ 0.188000] ? kernel_init_freeable+0x194/0x21a > >>> > >[ 0.188000] ? rest_init+0x80/0x80 > >>> > >[ 0.188000] ? kernel_init+0xa/0x100 > >>> > >[ 0.188000] ? ret_from_fork+0x25/0x30 > >>> > >>> I'm more interested in the way of triggering AE_NOT_ACQUIRED error. > >>> So could you send us the handcrafted ACPI table or both the "acpidump -c > >>> on" and "acpidump -c off" output? > > I modified FACP, FACS, APIC table in VirtualBox for Linux. > Here are raw dumps of table.
So, excuse me, but what's the security issue here? You hacked your ACPI tables into pieces which requires root privileges anyway. Thanks, Rafael
