Entreprise française de cybersécurité depuis 2004
☎ 03 60 47 09 81 - info@securiteinfo.com
☎ 03 60 47 09 81 - info@securiteinfo.com
In the Linux kernel, the following vulnerability has been resolved:ACPICA: fix acpi parse and parseext cache leaksACPICA commit 8829e70e1360c81e7a5a901b5d4f48330e021ea5I'm Seunghun Han, and I work for National Security Research Institute ofSouth Korea.I have been doing a research on ACPI and found an ACPI cache leak in ACPIearly abort cases.Boot log of ACPI cache leak is as follows:[ 0.352414] ACPI: Added _OSI(Module Device)[ 0.353182] ACPI: Added _OSI(Processor Device)[ 0.353182] ACPI: Added _OSI(3.0 _SCP Extensions)[ 0.353182] ACPI: Added _OSI(Processor Aggregator Device)[ 0.356028] ACPI: Unable to start the ACPI Interpreter[ 0.356799] ACPI Error: Could not remove SCI handler (20170303/evmisc-281)[ 0.360215] kmem_cache_destroy Acpi-State: Slab cache still has objects[ 0.360648] CPU: 0 PID: 1 Comm: swapper/0 Tainted: G W4.12.0-rc4-next-20170608+ #10[ 0.361273] Hardware name: innotek gmb_h virtual_box/virtual_box, BIOSvirtual_box 12/01/2006[ 0.361873] Call Trace:[ 0.362243] ? dump_stack+0x5c/0x81[ 0.362591] ? kmem_cache_destroy+0x1aa/0x1c0[ 0.362944] ? acpi_sleep_proc_init+0x27/0x27[ 0.363296] ? acpi_os_delete_cache+0xa/0x10[ 0.363646] ? acpi_ut_delete_caches+0x6d/0x7b[ 0.364000] ? acpi_terminate+0xa/0x14[ 0.364000] ? acpi_init+0x2af/0x34f[ 0.364000] ? __class_create+0x4c/0x80[ 0.364000] ? video_setup+0x7f/0x7f[ 0.364000] ? acpi_sleep_proc_init+0x27/0x27[ 0.364000] ? do_one_initcall+0x4e/0x1a0[ 0.364000] ? kernel_init_freeable+0x189/0x20a[ 0.364000] ? rest_init+0xc0/0xc0[ 0.364000] ? kernel_init+0xa/0x100[ 0.364000] ? ret_from_fork+0x25/0x30I analyzed this memory leak in detail. I found that “Acpi-State” cache and“Acpi-Parse” cache were merged because the size of cache objects was sameslab cache size.I finally found “Acpi-Parse” cache and “Acpi-parse_ext” cache were leakedusing SLAB_NEVER_MERGE flag in kmem_cache_create() function.Real ACPI cache leak point is as follows:[ 0.360101] ACPI: Added _OSI(Module Device)[ 0.360101] ACPI: Added _OSI(Processor Device)[ 0.360101] ACPI: Added _OSI(3.0 _SCP Extensions)[ 0.361043] ACPI: Added _OSI(Processor Aggregator Device)[ 0.364016] ACPI: Unable to start the ACPI Interpreter[ 0.365061] ACPI Error: Could not remove SCI handler (20170303/evmisc-281)[ 0.368174] kmem_cache_destroy Acpi-Parse: Slab cache still has objects[ 0.369332] CPU: 1 PID: 1 Comm: swapper/0 Tainted: G W4.12.0-rc4-next-20170608+ #8[ 0.371256] Hardware name: innotek gmb_h virtual_box/virtual_box, BIOSvirtual_box 12/01/2006[ 0.372000] Call Trace:[ 0.372000] ? dump_stack+0x5c/0x81[ 0.372000] ? kmem_cache_destroy+0x1aa/0x1c0[ 0.372000] ? acpi_sleep_proc_init+0x27/0x27[ 0.372000] ? acpi_os_delete_cache+0xa/0x10[ 0.372000] ? acpi_ut_delete_caches+0x56/0x7b[ 0.372000] ? acpi_terminate+0xa/0x14[ 0.372000] ? acpi_init+0x2af/0x34f[ 0.372000] ? __class_create+0x4c/0x80[ 0.372000] ? video_setup+0x7f/0x7f[ 0.372000] ? acpi_sleep_proc_init+0x27/0x27[ 0.372000] ? do_one_initcall+0x4e/0x1a0[ 0.372000] ? kernel_init_freeable+0x189/0x20a[ 0.372000] ? rest_init+0xc0/0xc0[ 0.372000] ? kernel_init+0xa/0x100[ 0.372000] ? ret_from_fork+0x25/0x30[ 0.388039] kmem_cache_destroy Acpi-parse_ext: Slab cache still has objects[ 0.389063] CPU: 1 PID: 1 Comm: swapper/0 Tainted: G W4.12.0-rc4-next-20170608+ #8[ 0.390557] Hardware name: innotek gmb_h virtual_box/virtual_box, BIOSvirtual_box 12/01/2006[ 0.392000] Call Trace:[ 0.392000] ? dump_stack+0x5c/0x81[ 0.392000] ? kmem_cache_destroy+0x1aa/0x1c0[ 0.392000] ? acpi_sleep_proc_init+0x27/0x27[ 0.392000] ? acpi_os_delete_cache+0xa/0x10[ 0.392000] ? acpi_ut_delete_caches+0x6d/0x7b[ 0.392000] ? acpi_terminate+0xa/0x14[ 0.392000] ? acpi_init+0x2af/0x3---truncated---
No PoCs from references.
- https://github.com/w4zu/Debian_security