arm64: Add CFI error handling

arm64: Add CFI error handling

With -fsanitize=kcfi, CFI always traps. Add arm64 support for handling CFI
failures. The registers containing the target address and the expected type
are encoded in the first ten bits of the ESR as follows:

 - 0-4: n, where the register Xn contains the target address
 - 5-9: m, where the register Wm contains the type hash

This produces the following oops on CFI failure (generated using lkdtm):

[   21.885179] CFI failure at lkdtm_indirect_call+0x2c/0x44 [lkdtm]
(target: lkdtm_increment_int+0x0/0x1c [lkdtm]; expected type: 0x7e0c52a)
[   21.886593] Internal error: Oops - CFI: 0 [#1] PREEMPT SMP
[   21.891060] Modules linked in: lkdtm
[   21.893363] CPU: 0 PID: 151 Comm: sh Not tainted
5.19.0-rc1-00021-g852f4e48dbab #1
[   21.895560] Hardware name: linux,dummy-virt (DT)
[   21.896543] pstate: 80400009 (Nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
[   21.897583] pc : lkdtm_indirect_call+0x2c/0x44 [lkdtm]
[   21.898551] lr : lkdtm_CFI_FORWARD_PROTO+0x3c/0x6c [lkdtm]
[   21.899520] sp : ffff8000083a3c50
[   21.900191] x29: ffff8000083a3c50 x28: ffff0000027e0ec0 x27: 0000000000000000
[   21.902453] x26: 0000000000000000 x25: ffffc2aa3d07e7b0 x24: 0000000000000002
[   21.903736] x23: ffffc2aa3d079088 x22: ffffc2aa3d07e7b0 x21: ffff000003379000
[   21.905062] x20: ffff8000083a3dc0 x19: 0000000000000012 x18: 0000000000000000
[   21.906371] x17: 000000007e0c52a5 x16: 000000003ad55aca x15: ffffc2aa60d92138
[   21.907662] x14: ffffffffffffffff x13: 2e2e2e2065707974 x12: 0000000000000018
[   21.909775] x11: ffffc2aa62322b88 x10: ffffc2aa62322aa0 x9 : c7e305fb5195d200
[   21.911898] x8 : ffffc2aa3d077e20 x7 : 6d20676e696c6c61 x6 : 43203a6d74646b6c
[   21.913108] x5 : ffffc2aa6266c9df x4 : ffffc2aa6266c9e1 x3 : ffff8000083a3968
[   21.914358] x2 : 80000000fffff122 x1 : 00000000fffff122 x0 : ffffc2aa3d07e8f8
[   21.915827] Call trace:
[   21.916375]  lkdtm_indirect_call+0x2c/0x44 [lkdtm]
[   21.918060]  lkdtm_CFI_FORWARD_PROTO+0x3c/0x6c [lkdtm]
[   21.919030]  lkdtm_do_action+0x34/0x4c [lkdtm]
[   21.919920]  direct_entry+0x170/0x1ac [lkdtm]
[   21.920772]  full_proxy_write+0x84/0x104
[   21.921759]  vfs_write+0x188/0x3d8
[   21.922387]  ksys_write+0x78/0xe8
[   21.922986]  __arm64_sys_write+0x1c/0x2c
[   21.923696]  invoke_syscall+0x58/0x134
[   21.924554]  el0_svc_common+0xb4/0xf4
[   21.925603]  do_el0_svc+0x2c/0xb4
[   21.926563]  el0_svc+0x2c/0x7c
[   21.927147]  el0t_64_sync_handler+0x84/0xf0
[   21.927985]  el0t_64_sync+0x18c/0x190
[   21.929133] Code: 728a54b1 72afc191 6b11021f 54000040 (d4304500)
[   21.930690] ---[ end trace 0000000000000000 ]---
[   21.930971] Kernel panic - not syncing: Oops - CFI: Fatal exception

Suggested-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Sami Tolvanen <samitolvanen@google.com>
Reviewed-by: Kees Cook <keescook@chromium.org>
Tested-by: Kees Cook <keescook@chromium.org>
Tested-by: Nathan Chancellor <nathan@kernel.org>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Tested-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Kees Cook <keescook@chromium.org>
Link: https://lore.kernel.org/r/20220908215504.3686827-11-samitolvanen@google.com