2164af29a0
Intel SGX allows to manage isolated compartments "Enclaves" in user VA space. Enclaves memory is part of processor reserved memory (PRM) and always encrypted. This allows to protect user application code and data from upper privilege levels including OS kernel. This includes SGX driver and optional linux ioctl compatibility layer. Intel SGX SDK for FreeBSD is also available. Note this requires support from hardware (available since late Intel Skylake CPUs). Many thanks to Robert Watson for support and Konstantin Belousov for code review. Project wiki: https://wiki.freebsd.org/Intel_SGX. Reviewed by: kib Relnotes: yes Sponsored by: DARPA, AFRL Differential Revision: https://reviews.freebsd.org/D11113
120 lines
3.5 KiB
C
120 lines
3.5 KiB
C
/*-
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* Copyright (c) 2017 Ruslan Bukin <br@bsdpad.com>
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* All rights reserved.
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*
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* This software was developed by BAE Systems, the University of Cambridge
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* Computer Laboratory, and Memorial University under DARPA/AFRL contract
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* FA8650-15-C-7558 ("CADETS"), as part of the DARPA Transparent Computing
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* (TC) research program.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/capsicum.h>
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#include <sys/conf.h>
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#include <sys/kernel.h>
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#include <sys/module.h>
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#include <sys/file.h>
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#include <sys/proc.h>
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#include <machine/sgx.h>
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#include <machine/../linux/linux.h>
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#include <machine/../linux/linux_proto.h>
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#include <compat/linux/linux_ioctl.h>
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#include <amd64/sgx/sgxvar.h>
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#include <sys/ioccom.h>
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#define SGX_LINUX_IOCTL_MIN (SGX_IOC_ENCLAVE_CREATE & 0xffff)
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#define SGX_LINUX_IOCTL_MAX (SGX_IOC_ENCLAVE_INIT & 0xffff)
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static int
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sgx_linux_ioctl(struct thread *td, struct linux_ioctl_args *args)
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{
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uint8_t data[SGX_IOCTL_MAX_DATA_LEN];
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cap_rights_t rights;
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struct file *fp;
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u_long cmd;
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int error;
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int len;
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error = fget(td, args->fd, cap_rights_init(&rights, CAP_IOCTL), &fp);
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if (error != 0)
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return (error);
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cmd = args->cmd;
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args->cmd &= ~(LINUX_IOC_IN | LINUX_IOC_OUT);
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if (cmd & LINUX_IOC_IN)
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args->cmd |= IOC_IN;
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if (cmd & LINUX_IOC_OUT)
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args->cmd |= IOC_OUT;
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len = IOCPARM_LEN(cmd);
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if (len > SGX_IOCTL_MAX_DATA_LEN) {
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printf("%s: Can't copy data: cmd len is too big %d\n",
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__func__, len);
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return (EINVAL);
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}
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if (cmd & LINUX_IOC_IN) {
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error = copyin((void *)args->arg, data, len);
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if (error) {
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printf("%s: Can't copy data, error %d\n",
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__func__, error);
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return (EINVAL);
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}
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}
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error = (fo_ioctl(fp, args->cmd, (caddr_t)data, td->td_ucred, td));
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fdrop(fp, td);
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return (error);
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}
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static struct linux_ioctl_handler sgx_linux_handler = {
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sgx_linux_ioctl,
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SGX_LINUX_IOCTL_MIN,
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SGX_LINUX_IOCTL_MAX,
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};
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SYSINIT(sgx_linux_register, SI_SUB_KLD, SI_ORDER_MIDDLE,
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linux_ioctl_register_handler, &sgx_linux_handler);
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SYSUNINIT(sgx_linux_unregister, SI_SUB_KLD, SI_ORDER_MIDDLE,
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linux_ioctl_unregister_handler, &sgx_linux_handler);
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static int
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sgx_linux_modevent(module_t mod, int type, void *data)
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{
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return (0);
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}
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DEV_MODULE(sgx_linux, sgx_linux_modevent, NULL);
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MODULE_DEPEND(sgx_linux, linux64, 1, 1, 1);
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