{ "containers": { "cna": { "providerMetadata": { "orgId": "f4215fc3-5b6b-47ff-a258-f7189bd81038" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nInput: elantech - fix stack out of bound access in elantech_change_report_id()\n\nThe array param[] in elantech_change_report_id() must be at least 3\nbytes, because elantech_read_reg_params() is calling ps2_command() with\nPSMOUSE_CMD_GETINFO, that is going to access 3 bytes from param[], but\nit's defined in the stack as an array of 2 bytes, therefore we have a\npotential stack out-of-bounds access here, also confirmed by KASAN:\n\n[ 6.512374] BUG: KASAN: stack-out-of-bounds in __ps2_command+0x372/0x7e0\n[ 6.512397] Read of size 1 at addr ffff8881024d77c2 by task kworker/2:1/118\n\n[ 6.512416] CPU: 2 PID: 118 Comm: kworker/2:1 Not tainted 5.13.0-22-generic #22+arighi20211110\n[ 6.512428] Hardware name: LENOVO 20T8000QGE/20T8000QGE, BIOS R1AET32W (1.08 ) 08/14/2020\n[ 6.512436] Workqueue: events_long serio_handle_event\n[ 6.512453] Call Trace:\n[ 6.512462] show_stack+0x52/0x58\n[ 6.512474] dump_stack+0xa1/0xd3\n[ 6.512487] print_address_description.constprop.0+0x1d/0x140\n[ 6.512502] ? __ps2_command+0x372/0x7e0\n[ 6.512516] __kasan_report.cold+0x7d/0x112\n[ 6.512527] ? _raw_write_lock_irq+0x20/0xd0\n[ 6.512539] ? __ps2_command+0x372/0x7e0\n[ 6.512552] kasan_report+0x3c/0x50\n[ 6.512564] __asan_load1+0x6a/0x70\n[ 6.512575] __ps2_command+0x372/0x7e0\n[ 6.512589] ? ps2_drain+0x240/0x240\n[ 6.512601] ? dev_printk_emit+0xa2/0xd3\n[ 6.512612] ? dev_vprintk_emit+0xc5/0xc5\n[ 6.512621] ? __kasan_check_write+0x14/0x20\n[ 6.512634] ? mutex_lock+0x8f/0xe0\n[ 6.512643] ? __mutex_lock_slowpath+0x20/0x20\n[ 6.512655] ps2_command+0x52/0x90\n[ 6.512670] elantech_ps2_command+0x4f/0xc0 [psmouse]\n[ 6.512734] elantech_change_report_id+0x1e6/0x256 [psmouse]\n[ 6.512799] ? elantech_report_trackpoint.constprop.0.cold+0xd/0xd [psmouse]\n[ 6.512863] ? ps2_command+0x7f/0x90\n[ 6.512877] elantech_query_info.cold+0x6bd/0x9ed [psmouse]\n[ 6.512943] ? elantech_setup_ps2+0x460/0x460 [psmouse]\n[ 6.513005] ? psmouse_reset+0x69/0xb0 [psmouse]\n[ 6.513064] ? psmouse_attr_set_helper+0x2a0/0x2a0 [psmouse]\n[ 6.513122] ? phys_pmd_init+0x30e/0x521\n[ 6.513137] elantech_init+0x8a/0x200 [psmouse]\n[ 6.513200] ? elantech_init_ps2+0xf0/0xf0 [psmouse]\n[ 6.513249] ? elantech_query_info+0x440/0x440 [psmouse]\n[ 6.513296] ? synaptics_send_cmd+0x60/0x60 [psmouse]\n[ 6.513342] ? elantech_query_info+0x440/0x440 [psmouse]\n[ 6.513388] ? psmouse_try_protocol+0x11e/0x170 [psmouse]\n[ 6.513432] psmouse_extensions+0x65d/0x6e0 [psmouse]\n[ 6.513476] ? psmouse_try_protocol+0x170/0x170 [psmouse]\n[ 6.513519] ? mutex_unlock+0x22/0x40\n[ 6.513526] ? ps2_command+0x7f/0x90\n[ 6.513536] ? psmouse_probe+0xa3/0xf0 [psmouse]\n[ 6.513580] psmouse_switch_protocol+0x27d/0x2e0 [psmouse]\n[ 6.513624] psmouse_connect+0x272/0x530 [psmouse]\n[ 6.513669] serio_driver_probe+0x55/0x70\n[ 6.513679] really_probe+0x190/0x720\n[ 6.513689] driver_probe_device+0x160/0x1f0\n[ 6.513697] device_driver_attach+0x119/0x130\n[ 6.513705] ? device_driver_attach+0x130/0x130\n[ 6.513713] __driver_attach+0xe7/0x1a0\n[ 6.513720] ? device_driver_attach+0x130/0x130\n[ 6.513728] bus_for_each_dev+0xfb/0x150\n[ 6.513738] ? subsys_dev_iter_exit+0x10/0x10\n[ 6.513748] ? _raw_write_unlock_bh+0x30/0x30\n[ 6.513757] driver_attach+0x2d/0x40\n[ 6.513764] serio_handle_event+0x199/0x3d0\n[ 6.513775] process_one_work+0x471/0x740\n[ 6.513785] worker_thread+0x2d2/0x790\n[ 6.513794] ? process_one_work+0x740/0x740\n[ 6.513802] kthread+0x1b4/0x1e0\n[ 6.513809] ? set_kthread_struct+0x80/0x80\n[ 6.513816] ret_from_fork+0x22/0x30\n\n[ 6.513832] The buggy address belongs to the page:\n[ 6.513838] page:00000000bc35e189 refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1024d7\n[ 6.513847] flags: 0x17ffffc0000000(node=0|zone=2|lastcpupid=0x1fffff)\n[ 6.513860] raw: 0\n---truncated---" } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/input/mouse/elantech.c" ], "versions": [ { "version": "9e4815cf1785", "lessThan": "a7f95328c6f0", "status": "affected", "versionType": "git" }, { "version": "dde807b4a442", "lessThan": "676c572439e5", "status": "affected", "versionType": "git" }, { "version": "e4c9062717fe", "lessThan": "dfd5b60b5342", "status": "affected", "versionType": "git" }, { "version": "e4c9062717fe", "lessThan": "1d72d9f960cc", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/input/mouse/elantech.c" ], "versions": [ { "version": "5.11", "status": "affected" }, { "version": "0", "lessThan": "5.11", "status": "unaffected", "versionType": "custom" }, { "version": "5.4.169", "lessThanOrEqual": "5.4.*", "status": "unaffected", "versionType": "custom" }, { "version": "5.10.89", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "custom" }, { "version": "5.15.12", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "custom" }, { "version": "5.16", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/a7f95328c6f0afffdc4555f16e3bbab8bbf0d9be" }, { "url": "https://git.kernel.org/stable/c/676c572439e58b7ee6b7ca3f1e5595382921045c" }, { "url": "https://git.kernel.org/stable/c/dfd5b60b5342b6b505a104e48f08ad9b9bdbbd7b" }, { "url": "https://git.kernel.org/stable/c/1d72d9f960ccf1052a0630a68c3d358791dbdaaa" } ], "title": "Input: elantech - fix stack out of bound access in elantech_change_report_id()", "x_generator": { "engine": "bippy-a5840b7849dd" } } }, "cveMetadata": { "assignerOrgId": "f4215fc3-5b6b-47ff-a258-f7189bd81038", "cveID": "CVE-2021-47097", "requesterUserId": "gregkh@kernel.org", "serial": "1", "state": "PUBLISHED" }, "dataType": "CVE_RECORD", "dataVersion": "5.0" }