riscv: prevent pt_regs corruption for secondary idle threads

Vulnerability Description

In the Linux kernel, the following vulnerability has been resolved: riscv: prevent pt_regs corruption for secondary idle threads Top of the kernel thread stack should be reserved for pt_regs. However this is not the case for the idle threads of the secondary boot harts. Their stacks overlap with their pt_regs, so both may get corrupted. Similar issue has been fixed for the primary hart, see c7cdd96eca28 ("riscv: prevent stack corruption by reserving task_pt_regs(p) early"). However that fix was not propagated to the secondary harts. The problem has been noticed in some CPU hotplug tests with V enabled. The function smp_callin stored several registers on stack, corrupting top of pt_regs structure including status field. As a result, kernel attempted to save or restore inexistent V context.

References

• https://git.kernel.org/stable/c/ea22d4195cca13d5fdbc4d6555a2dfb8a7867a9e
• https://git.kernel.org/stable/c/3090c06d50eaa91317f84bf3eac4c265e6cb8d44
• https://git.kernel.org/stable/c/0c1f28c32a194303da630fca89481334b9547b80
• https://git.kernel.org/stable/c/a638b0461b58aa3205cd9d5f14d6f703d795b4af