KVM: arm64: Fix shift-out-of-bounds bug

Fix a shift-out-of-bounds bug reported by UBSAN when running
VM with MTE enabled host kernel.

UBSAN: shift-out-of-bounds in arch/arm64/kvm/sys_regs.c:1988:14
shift exponent 33 is too large for 32-bit type 'int'
CPU: 26 UID: 0 PID: 7629 Comm: qemu-kvm Not tainted 6.12.0-rc2 #34
Hardware name: IEI NF5280R7/Mitchell MB, BIOS 00.00. 2024-10-12 09:28:54 10/14/2024
Call trace:
 dump_backtrace+0xa0/0x128
 show_stack+0x20/0x38
 dump_stack_lvl+0x74/0x90
 dump_stack+0x18/0x28
 __ubsan_handle_shift_out_of_bounds+0xf8/0x1e0
 reset_clidr+0x10c/0x1c8
 kvm_reset_sys_regs+0x50/0x1c8
 kvm_reset_vcpu+0xec/0x2b0
 __kvm_vcpu_set_target+0x84/0x158
 kvm_vcpu_set_target+0x138/0x168
 kvm_arch_vcpu_ioctl_vcpu_init+0x40/0x2b0
 kvm_arch_vcpu_ioctl+0x28c/0x4b8
 kvm_vcpu_ioctl+0x4bc/0x7a8
 __arm64_sys_ioctl+0xb4/0x100
 invoke_syscall+0x70/0x100
 el0_svc_common.constprop.0+0x48/0xf0
 do_el0_svc+0x24/0x38
 el0_svc+0x3c/0x158
 el0t_64_sync_handler+0x120/0x130
 el0t_64_sync+0x194/0x198

Fixes: 7af0c25 ("KVM: arm64: Normalize cache configuration")
Cc: [email protected]
Reviewed-by: Gavin Shan <[email protected]>
Signed-off-by: Ilkka Koskinen <[email protected]>
Reviewed-by: Anshuman Khandual <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Marc Zyngier <[email protected]>

arch/arm64/kvm/sys_regs.c

@@ -1994,7 +1994,7 @@ static u64 reset_clidr(struct kvm_vcpu *vcpu, const struct sys_reg_desc *r)
 	 * one cache line.
 	 */
 	if (kvm_has_mte(vcpu->kvm))
-		clidr |= 2 << CLIDR_TTYPE_SHIFT(loc);
+		clidr |= 2ULL << CLIDR_TTYPE_SHIFT(loc);
 
 	__vcpu_sys_reg(vcpu, r->reg) = clidr;