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CVE-2024-57903: net: restrict SO_REUSEPORT to inet sockets

Description

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

net: restrict SO_REUSEPORT to inet sockets

After blamed commit, crypto sockets could accidentally be destroyed
from RCU call back, as spotted by zyzbot [1].

Trying to acquire a mutex in RCU callback is not allowed.

Restrict SO_REUSEPORT socket option to inet sockets.

v1 of this patch supported TCP, UDP and SCTP sockets,
but fcnal-test.sh test needed RAW and ICMP support.

[1]
BUG: sleeping function called from invalid context at kernel/locking/mutex.c:562
in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 24, name: ksoftirqd/1
preempt_count: 100, expected: 0
RCU nest depth: 0, expected: 0
1 lock held by ksoftirqd/1/24:
#0: ffffffff8e937ba0 (rcu_callback){....}-{0:0}, at: rcu_lock_acquire include/linux/rcupdate.h:337 [inline]
#0: ffffffff8e937ba0 (rcu_callback){....}-{0:0}, at: rcu_do_batch kernel/rcu/tree.c:2561 [inline]
#0: ffffffff8e937ba0 (rcu_callback){....}-{0:0}, at: rcu_core+0xa37/0x17a0 kernel/rcu/tree.c:2823
Preemption disabled at:
[] softirq_handle_begin kernel/softirq.c:402 [inline]
[] handle_softirqs+0x128/0x9b0 kernel/softirq.c:537
CPU: 1 UID: 0 PID: 24 Comm: ksoftirqd/1 Not tainted 6.13.0-rc3-syzkaller-00174-ga024e377efed #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
Call Trace:

__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120
__might_resched+0x5d4/0x780 kernel/sched/core.c:8758
...

Classification

CVE ID: CVE-2024-57903

Affected Products

Vendor: Linux

Product: Linux

Exploit Prediction Scoring System (EPSS)

EPSS Score: 0.05% (probability of being exploited)

EPSS Percentile: 17.81% (scored less or equal to compared to others)

EPSS Date: 2025-02-13 (when was this score calculated)

References

https://git.kernel.org/stable/c/579cfa595af1e00ccc9c3a849a4add6bba8b4bad
https://git.kernel.org/stable/c/ad2ad4cd11af9d63187cd074314b71b7cf8a2a59
https://git.kernel.org/stable/c/ad91a2dacbf8c26a446658cdd55e8324dfeff1e7
https://git.kernel.org/stable/c/3257813a3ae7462ac5cde04e120806f0c0776850
https://git.kernel.org/stable/c/5b0af621c3f6ef9261cf6067812f2fd9943acb4b

Timeline