CVE-2024-38667 riscv: prevent pt_regs corruption for secondary idle threads

In the Linux kernel, the following vulnerability has been resolved: riscv: prevent ptregs corruption for secondary idle threads Top of the kernel thread stack should be reserved for ptregs. However this is not the case for the idle threads of the secondary boot harts. Their stacks overlap with...

CVE-2024-38667

CVE-2024-38667 affects the Linux kernel on RISC‑V: secondary idle threads can have their top‑of‑stack overlap with pt_regs, risking corruption of pt_regs and potentially saving/restoring a non‑existent V context. The issue mirrors a fix for the primary hart and was not propagated to secondary har...