Description

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

riscv: Fix sleeping in invalid context in die()

die() can be called in exception handler, and therefore cannot sleep.
However, die() takes spinlock_t which can sleep with PREEMPT_RT enabled.
That causes the following warning:

BUG: sleeping function called from invalid context at kernel/locking/spinlock_rt.c:48
in_atomic(): 1, irqs_disabled(): 1, non_block: 0, pid: 285, name: mutex
preempt_count: 110001, expected: 0
RCU nest depth: 0, expected: 0
CPU: 0 UID: 0 PID: 285 Comm: mutex Not tainted 6.12.0-rc7-00022-ge19049cf7d56-dirty #234
Hardware name: riscv-virtio,qemu (DT)
Call Trace:
dump_backtrace+0x1c/0x24
show_stack+0x2c/0x38
dump_stack_lvl+0x5a/0x72
dump_stack+0x14/0x1c
__might_resched+0x130/0x13a
rt_spin_lock+0x2a/0x5c
die+0x24/0x112
do_trap_insn_illegal+0xa0/0xea
_new_vmalloc_restore_context_a0+0xcc/0xd8
Oops - illegal instruction [#1]

Switch to use raw_spinlock_t, which does not sleep even with PREEMPT_RT
enabled.

Classification

CVE ID: CVE-2024-57939

Affected Products

Vendor: Linux

Product: Linux

Exploit Prediction Scoring System (EPSS)

EPSS Score: 0.04% (probability of being exploited)

EPSS Percentile: 12.61% (scored less or equal to compared to others)

EPSS Date: 2025-02-19 (when was this score calculated)

References

https://git.kernel.org/stable/c/c21df31fc2a4afc02a6e56511364e9e793ea92ec
https://git.kernel.org/stable/c/f48f060a4b36b5e96628f6c3fb1540f1e8dedb69
https://git.kernel.org/stable/c/76ab0afcdbe8c9685b589016ee1c0e25fe596707
https://git.kernel.org/stable/c/6a97f4118ac07cfdc316433f385dbdc12af5025e

Timeline