1.5 KiB
CVE-2024-57939
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:48in_atomic(): 1, irqs_disabled(): 1, non_block: 0, pid: 285, name: mutexpreempt_count: 110001, expected: 0RCU nest depth: 0, expected: 0CPU: 0 UID: 0 PID: 285 Comm: mutex Not tainted 6.12.0-rc7-00022-ge19049cf7d56-dirty #234Hardware 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/0xd8Oops - illegal instruction [#1]Switch to use raw_spinlock_t, which does not sleep even with PREEMPT_RTenabled.
POC
Reference
No PoCs from references.