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CVE-2024-57913

Description

In the Linux kernel, the following vulnerability has been resolved:usb: gadget: f_fs: Remove WARN_ON in functionfs_bindThis commit addresses an issue related to below kernel panic wherepanic_on_warn is enabled. It is caused by the unnecessary use of WARN_ONin functionsfs_bind, which easily leads to the following scenarios.1.adb_write in adbd 2. UDC write via configfs ================= =====================->usb_ffs_open_thread() ->UDC write ->open_functionfs() ->configfs_write_iter() ->adb_open() ->gadget_dev_desc_UDC_store() ->adb_write() ->usb_gadget_register_driver_owner ->driver_register()->StartMonitor() ->bus_add_driver() ->adb_read() ->gadget_bind_driver() ->configfs_composite_bind() ->usb_add_function()->open_functionfs() ->ffs_func_bind() ->adb_open() ->functionfs_bind() state !=FFS_ACTIVE>The adb_open, adb_read, and adb_write operations are invoked from thedaemon, but trying to bind the function is a process that is invoked byUDC write through configfs, which opens up the possibility of a racecondition between the two paths. In this race scenario, the kernel panicoccurs due to the WARN_ON from functionfs_bind when panic_on_warn isenabled. This commit fixes the kernel panic by removing the unnecessaryWARN_ON.Kernel panic - not syncing: kernel: panic_on_warn set ...[ 14.542395] Call trace:[ 14.542464] ffs_func_bind+0x1c8/0x14a8[ 14.542468] usb_add_function+0xcc/0x1f0[ 14.542473] configfs_composite_bind+0x468/0x588[ 14.542478] gadget_bind_driver+0x108/0x27c[ 14.542483] really_probe+0x190/0x374[ 14.542488] __driver_probe_device+0xa0/0x12c[ 14.542492] driver_probe_device+0x3c/0x220[ 14.542498] __driver_attach+0x11c/0x1fc[ 14.542502] bus_for_each_dev+0x104/0x160[ 14.542506] driver_attach+0x24/0x34[ 14.542510] bus_add_driver+0x154/0x270[ 14.542514] driver_register+0x68/0x104[ 14.542518] usb_gadget_register_driver_owner+0x48/0xf4[ 14.542523] gadget_dev_desc_UDC_store+0xf8/0x144[ 14.542526] configfs_write_iter+0xf0/0x138

POC

Reference

No PoCs from references.

Github

- https://github.com/oogasawa/Utility-security

- https://github.com/w4zu/Debian_security