powerpc/pseries: Rework lppaca_shared_proc() to avoid DEBUG_PREEMPT

Vulnerability Description

In the Linux kernel, the following vulnerability has been resolved: powerpc/pseries: Rework lppaca_shared_proc() to avoid DEBUG_PREEMPT lppaca_shared_proc() takes a pointer to the lppaca which is typically accessed through get_lppaca(). With DEBUG_PREEMPT enabled, this leads to checking if preemption is enabled, for example: BUG: using smp_processor_id() in preemptible [00000000] code: grep/10693 caller is lparcfg_data+0x408/0x19a0 CPU: 4 PID: 10693 Comm: grep Not tainted 6.5.0-rc3 #2 Call Trace: dump_stack_lvl+0x154/0x200 (unreliable) check_preemption_disabled+0x214/0x220 lparcfg_data+0x408/0x19a0 ... This isn't actually a problem however, as it does not matter which lppaca is accessed, the shared proc state will be the same. vcpudispatch_stats_procfs_init() already works around this by disabling preemption, but the lparcfg code does not, erroring any time /proc/powerpc/lparcfg is accessed with DEBUG_PREEMPT enabled. Instead of disabling preemption on the caller side, rework lppaca_shared_proc() to not take a pointer and instead directly access the lppaca, bypassing any potential preemption checks. [mpe: Rework to avoid needing a definition in paca.h and lppaca.h]

References

• https://git.kernel.org/stable/c/953c54dfdc5d3eb7243ed902b50acb5ea1db4355
• https://git.kernel.org/stable/c/2935443dc9c28499223d8c881474259e4b998f2a
• https://git.kernel.org/stable/c/4c8568cf4c45b415854195c8832b557cdefba57a
• https://git.kernel.org/stable/c/3c5e8e666794d7dde6d14ea846c6c04f2bb34900
• https://git.kernel.org/stable/c/f45ee5c074013a0fbfce77a5af5efddb01f5d4f4
• https://git.kernel.org/stable/c/eac030b22ea12cdfcbb2e941c21c03964403c63f