CVE-2024-57939

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> riscv: Fix sleeping in invalid context in die()<br /> <br /> die() can be called in exception handler, and therefore cannot sleep.<br /> However, die() takes spinlock_t which can sleep with PREEMPT_RT enabled.<br /> That causes the following warning:<br /> <br /> BUG: sleeping function called from invalid context at kernel/locking/spinlock_rt.c:48<br /> in_atomic(): 1, irqs_disabled(): 1, non_block: 0, pid: 285, name: mutex<br /> preempt_count: 110001, expected: 0<br /> RCU nest depth: 0, expected: 0<br /> CPU: 0 UID: 0 PID: 285 Comm: mutex Not tainted 6.12.0-rc7-00022-ge19049cf7d56-dirty #234<br /> Hardware name: riscv-virtio,qemu (DT)<br /> Call Trace:<br /> dump_backtrace+0x1c/0x24<br /> show_stack+0x2c/0x38<br /> dump_stack_lvl+0x5a/0x72<br /> dump_stack+0x14/0x1c<br /> __might_resched+0x130/0x13a<br /> rt_spin_lock+0x2a/0x5c<br /> die+0x24/0x112<br /> do_trap_insn_illegal+0xa0/0xea<br /> _new_vmalloc_restore_context_a0+0xcc/0xd8<br /> Oops - illegal instruction [#1]<br /> <br /> Switch to use raw_spinlock_t, which does not sleep even with PREEMPT_RT<br /> enabled.