Vulnerability CVE-2024-38597
Published: 2024-06-19

Description:
In the Linux kernel, the following vulnerability has been resolved:

eth: sungem: remove .ndo_poll_controller to avoid deadlocks

Erhard reports netpoll warnings from sungem:

netpoll_send_skb_on_dev(): eth0 enabled interrupts in poll (gem_start_xmit+0x0/0x398)
WARNING: CPU: 1 PID: 1 at net/core/netpoll.c:370 netpoll_send_skb+0x1fc/0x20c

gem_poll_controller() disables interrupts, which may sleep.
We can't sleep in netpoll, it has interrupts disabled completely.
Strangely, gem_poll_controller() doesn't even poll the completions,
and instead acts as if an interrupt has fired so it just schedules
NAPI and exits. None of this has been necessary for years, since
netpoll invokes NAPI directly.

 References:
https://git.kernel.org/stable/c/e22b23f5888a065d084e87db1eec639c445e677f
https://git.kernel.org/stable/c/fbeeb55dbb33d562149c57e794f06b7414e44289
https://git.kernel.org/stable/c/476adb3bbbd7886e8251d3b9ce2d3c3e680f35d6
https://git.kernel.org/stable/c/5de5aeb98f9a000adb0db184e32765e4815d860b
https://git.kernel.org/stable/c/faf94f1eb8a34b2c31b2042051ef36f63420ecce
https://git.kernel.org/stable/c/6400d205fbbcbcf9b8510157e1f379c1d7e2e937
https://git.kernel.org/stable/c/ac0a230f719b02432d8c7eba7615ebd691da86f4
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