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CVE-2022-1974: nfc: replace improper check device_is_registered() in netlink related… · torvalds/linux@da5c0f1
A use-after-free flaw was found in the Linux kernel’s NFC core functionality due to a race condition between kobject creation and delete. This vulnerability allows a local attacker with CAP_NET_ADMIN privilege to leak kernel information.
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nfc: replace improper check device_is_registered() in netlink related…
… functions
The device_is_registered() in nfc core is used to check whether nfc device is registered in netlink related functions such as nfc_fw_download(), nfc_dev_up() and so on. Although device_is_registered() is protected by device_lock, there is still a race condition between device_del() and device_is_registered(). The root cause is that kobject_del() in device_del() is not protected by device_lock.
(cleanup task) | (netlink task) | nfc_unregister_device | nfc_fw_download device_del | device_lock … | if (!device_is_registered)//(1) kobject_del//(2) | … … | device_unlock
The device_is_registered() returns the value of state_in_sysfs and the state_in_sysfs is set to zero in kobject_del(). If we pass check in position (1), then set zero in position (2). As a result, the check in position (1) is useless.
This patch uses bool variable instead of device_is_registered() to judge whether the nfc device is registered, which is well synchronized.
Fixes: 3e256b8 (“NFC: add nfc subsystem core”) Signed-off-by: Duoming Zhou [email protected] Signed-off-by: David S. Miller [email protected]
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