{ "data_version": "4.0", "data_type": "CVE", "data_format": "MITRE", "CVE_data_meta": { "ID": "CVE-2023-52478", "ASSIGNER": "cve@kernel.org", "STATE": "PUBLIC" }, "description": { "description_data": [ { "lang": "eng", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nHID: logitech-hidpp: Fix kernel crash on receiver USB disconnect\n\nhidpp_connect_event() has *four* time-of-check vs time-of-use (TOCTOU)\nraces when it races with itself.\n\nhidpp_connect_event() primarily runs from a workqueue but it also runs\non probe() and if a \"device-connected\" packet is received by the hw\nwhen the thread running hidpp_connect_event() from probe() is waiting on\nthe hw, then a second thread running hidpp_connect_event() will be\nstarted from the workqueue.\n\nThis opens the following races (note the below code is simplified):\n\n1. Retrieving + printing the protocol (harmless race):\n\n\tif (!hidpp->protocol_major) {\n\t\thidpp_root_get_protocol_version()\n\t\thidpp->protocol_major = response.rap.params[0];\n\t}\n\nWe can actually see this race hit in the dmesg in the abrt output\nattached to rhbz#2227968:\n\n[ 3064.624215] logitech-hidpp-device 0003:046D:4071.0049: HID++ 4.5 device connected.\n[ 3064.658184] logitech-hidpp-device 0003:046D:4071.0049: HID++ 4.5 device connected.\n\nTesting with extra logging added has shown that after this the 2 threads\ntake turn grabbing the hw access mutex (send_mutex) so they ping-pong\nthrough all the other TOCTOU cases managing to hit all of them:\n\n2. Updating the name to the HIDPP name (harmless race):\n\n\tif (hidpp->name == hdev->name) {\n\t\t...\n\t\thidpp->name = new_name;\n\t}\n\n3. Initializing the power_supply class for the battery (problematic!):\n\nhidpp_initialize_battery()\n{\n if (hidpp->battery.ps)\n return 0;\n\n\tprobe_battery(); /* Blocks, threads take turns executing this */\n\n\thidpp->battery.desc.properties =\n\t\tdevm_kmemdup(dev, hidpp_battery_props, cnt, GFP_KERNEL);\n\n\thidpp->battery.ps =\n\t\tdevm_power_supply_register(&hidpp->hid_dev->dev,\n\t\t\t\t\t &hidpp->battery.desc, cfg);\n}\n\n4. Creating delayed input_device (potentially problematic):\n\n\tif (hidpp->delayed_input)\n\t\treturn;\n\n\thidpp->delayed_input = hidpp_allocate_input(hdev);\n\nThe really big problem here is 3. Hitting the race leads to the following\nsequence:\n\n\thidpp->battery.desc.properties =\n\t\tdevm_kmemdup(dev, hidpp_battery_props, cnt, GFP_KERNEL);\n\n\thidpp->battery.ps =\n\t\tdevm_power_supply_register(&hidpp->hid_dev->dev,\n\t\t\t\t\t &hidpp->battery.desc, cfg);\n\n\t...\n\n\thidpp->battery.desc.properties =\n\t\tdevm_kmemdup(dev, hidpp_battery_props, cnt, GFP_KERNEL);\n\n\thidpp->battery.ps =\n\t\tdevm_power_supply_register(&hidpp->hid_dev->dev,\n\t\t\t\t\t &hidpp->battery.desc, cfg);\n\nSo now we have registered 2 power supplies for the same battery,\nwhich looks a bit weird from userspace's pov but this is not even\nthe really big problem.\n\nNotice how:\n\n1. This is all devm-maganaged\n2. The hidpp->battery.desc struct is shared between the 2 power supplies\n3. hidpp->battery.desc.properties points to the result from the second\n devm_kmemdup()\n\nThis causes a use after free scenario on USB disconnect of the receiver:\n1. The last registered power supply class device gets unregistered\n2. The memory from the last devm_kmemdup() call gets freed,\n hidpp->battery.desc.properties now points to freed memory\n3. The first registered power supply class device gets unregistered,\n this involves sending a remove uevent to userspace which invokes\n power_supply_uevent() to fill the uevent data\n4. power_supply_uevent() uses hidpp->battery.desc.properties which\n now points to freed memory leading to backtraces like this one:\n\nSep 22 20:01:35 eric kernel: BUG: unable to handle page fault for address: ffffb2140e017f08\n...\nSep 22 20:01:35 eric kernel: Workqueue: usb_hub_wq hub_event\nSep 22 20:01:35 eric kernel: RIP: 0010:power_supply_uevent+0xee/0x1d0\n...\nSep 22 20:01:35 eric kernel: ? asm_exc_page_fault+0x26/0x30\nSep 22 20:01:35 eric kernel: ? power_supply_uevent+0xee/0x1d0\nSep 22 20:01:35 eric kernel: ? power_supply_uevent+0x10d/0x1d0\nSep 22 20:01:35 eric kernel: dev_uevent+0x10f/0x2d0\nSep 22 20:01:35 eric kernel: kobject_uevent_env+0x291/0x680\nSep 22 20:01:35 eric kernel: \n---truncated---" } ] }, "problemtype": { "problemtype_data": [ { "description": [ { "lang": "eng", "value": "n/a" } ] } ] }, "affects": { "vendor": { "vendor_data": [ { "vendor_name": "Linux", "product": { "product_data": [ { "product_name": "Linux", "version": { "version_data": [ { "version_affected": "<", "version_name": "1da177e4c3f4", "version_value": "ca0c4cc1d215" }, { "version_value": "not down converted", "x_cve_json_5_version_data": { "versions": [ { "version": "4.14.328", "lessThanOrEqual": "4.14.*", "status": "unaffected", "versionType": "custom" }, { "version": "4.19.297", "lessThanOrEqual": "4.19.*", "status": "unaffected", "versionType": "custom" }, { "version": "5.4.259", "lessThanOrEqual": "5.4.*", "status": "unaffected", "versionType": "custom" }, { "version": "5.10.199", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "custom" }, { "version": "5.15.136", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "custom" }, { "version": "6.1.59", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "custom" }, { "version": "6.5.8", "lessThanOrEqual": "6.5.*", "status": "unaffected", "versionType": "custom" }, { "version": "6.6", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ], "defaultStatus": "affected" } } ] } } ] } } ] } }, "references": { "reference_data": [ { "url": "https://git.kernel.org/stable/c/ca0c4cc1d215dc22ab0e738c9f017c650f3183f5", "refsource": "MISC", "name": "https://git.kernel.org/stable/c/ca0c4cc1d215dc22ab0e738c9f017c650f3183f5" }, { "url": "https://git.kernel.org/stable/c/44481b244fcaa2b895a53081d6204c574720c38c", "refsource": "MISC", "name": "https://git.kernel.org/stable/c/44481b244fcaa2b895a53081d6204c574720c38c" }, { "url": "https://git.kernel.org/stable/c/cd0e2bf7fb22fe9b989c59c42dca06367fd10e6b", "refsource": "MISC", "name": "https://git.kernel.org/stable/c/cd0e2bf7fb22fe9b989c59c42dca06367fd10e6b" }, { "url": "https://git.kernel.org/stable/c/093af62c023537f097d2ebdfaa0bc7c1a6e874e1", "refsource": "MISC", "name": "https://git.kernel.org/stable/c/093af62c023537f097d2ebdfaa0bc7c1a6e874e1" }, { "url": "https://git.kernel.org/stable/c/28ddc1e0b898291323b62d770b1b931de131a528", "refsource": "MISC", "name": "https://git.kernel.org/stable/c/28ddc1e0b898291323b62d770b1b931de131a528" }, { "url": "https://git.kernel.org/stable/c/fd72ac9556a473fc7daf54efb6ca8a97180d621d", "refsource": "MISC", "name": "https://git.kernel.org/stable/c/fd72ac9556a473fc7daf54efb6ca8a97180d621d" }, { "url": "https://git.kernel.org/stable/c/f7b2c7d9831af99369fe8ad9b2a68d78942f414e", "refsource": "MISC", "name": "https://git.kernel.org/stable/c/f7b2c7d9831af99369fe8ad9b2a68d78942f414e" }, { "url": "https://git.kernel.org/stable/c/dac501397b9d81e4782232c39f94f4307b137452", "refsource": "MISC", "name": "https://git.kernel.org/stable/c/dac501397b9d81e4782232c39f94f4307b137452" } ] }, "generator": { "engine": "bippy-a5840b7849dd" } }