CVE-2023-52978

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

riscv: kprobe: Fixup kernel panic when probing an illegal position

The kernel would panic when probed for an illegal position. eg:

(CONFIGRISCVISA_C=n)

echo 'p:hello kernelclone+0x16 a0=%a0' >> kprobeevents echo 1 > events/kprobes/hello/enable cat trace

Kernel panic - not syncing: stack-protector: Kernel stack is corrupted in: _dosysnewfstatat+0xb8/0xb8 CPU: 0 PID: 111 Comm: sh Not tainted 6.2.0-rc1-00027-g2d398fe49a4d #490 Hardware name: riscv-virtio,qemu (DT) Call Trace: [<ffffffff80007268>] dumpbacktrace+0x38/0x48 [<ffffffff80c5e83c>] showstack+0x50/0x68 [<ffffffff80c6da28>] dumpstacklvl+0x60/0x84 [<ffffffff80c6da6c>] dumpstack+0x20/0x30 [<ffffffff80c5ecf4>] panic+0x160/0x374 [<ffffffff80c6db94>] generichandlearchirq+0x0/0xa8 [<ffffffff802deeb0>] sysnewstat+0x0/0x30 [<ffffffff800158c0>] sysclone+0x20/0x30 [<ffffffff800039e8>] retfromsyscall+0x0/0x4 ---[ end Kernel panic - not syncing: stack-protector: Kernel stack is corrupted in: _dosysnewfstatat+0xb8/0xb8 ]---

That is because the kprobe's ebreak instruction broke the kernel's original code. The user should guarantee the correction of the probe position, but it couldn't make the kernel panic.

This patch adds archcheckkprobe in archpreparekprobe to prevent an illegal position (Such as the middle of an instruction).