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CVE-2022-1975: NFC: netlink: fix sleep in atomic bug when firmware download timeout · torvalds/linux@4071bf1
There is a sleep-in-atomic bug in /net/nfc/netlink.c that allows an attacker to crash the Linux kernel by simulating a nfc device from user-space.
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NFC: netlink: fix sleep in atomic bug when firmware download timeout
There are sleep in atomic bug that could cause kernel panic during firmware download process. The root cause is that nlmsg_new with GFP_KERNEL parameter is called in fw_dnld_timeout which is a timer handler. The call trace is shown below:
BUG: sleeping function called from invalid context at include/linux/sched/mm.h:265 Call Trace: kmem_cache_alloc_node __alloc_skb nfc_genl_fw_download_done call_timer_fn __run_timers.part.0 run_timer_softirq __do_softirq …
The nlmsg_new with GFP_KERNEL parameter may sleep during memory allocation process, and the timer handler is run as the result of a “software interrupt” that should not call any other function that could sleep.
This patch changes allocation mode of netlink message from GFP_KERNEL to GFP_ATOMIC in order to prevent sleep in atomic bug. The GFP_ATOMIC flag makes memory allocation operation could be used in atomic context.
Fixes: 9674da8 (“NFC: Add firmware upload netlink command”) Fixes: 9ea7187 (“NFC: netlink: Rename CMD_FW_UPLOAD to CMD_FW_DOWNLOAD”) Signed-off-by: Duoming Zhou [email protected] Reviewed-by: Krzysztof Kozlowski [email protected] Link: https://lore.kernel.org/r/[email protected] Signed-off-by: Paolo Abeni [email protected]
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