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Message-ID: <op.0p9xohs2wjvjmi@hhuan26-mobl1.amr.corp.intel.com>
Date: Tue, 01 Sep 2020 11:41:14 -0500
From: "Haitao Huang" <haitao.huang@...ux.intel.com>
To: x86@...nel.org, linux-sgx@...r.kernel.org,
"Jarkko Sakkinen" <jarkko.sakkinen@...ux.intel.com>
Cc: linux-kernel@...r.kernel.org,
"Jethro Beekman" <jethro@...tanix.com>,
"Chunyang Hui" <sanqian.hcy@...fin.com>,
"Jordan Hand" <jorhand@...ux.microsoft.com>,
"Nathaniel McCallum" <npmccallum@...hat.com>,
"Seth Moore" <sethmo@...gle.com>,
"Sean Christopherson" <sean.j.christopherson@...el.com>,
"Suresh Siddha" <suresh.b.siddha@...el.com>,
akpm@...ux-foundation.org, andriy.shevchenko@...ux.intel.com,
asapek@...gle.com, bp@...en8.de, cedric.xing@...el.com,
chenalexchen@...gle.com, conradparker@...gle.com,
cyhanish@...gle.com, dave.hansen@...el.com, josh@...htriplett.org,
kai.huang@...el.com, kai.svahn@...el.com, kmoy@...gle.com,
ludloff@...gle.com, luto@...nel.org, nhorman@...hat.com,
puiterwijk@...hat.com, rientjes@...gle.com, tglx@...utronix.de,
yaozhangx@...gle.com
Subject: Re: [PATCH v36 12/24] x86/sgx: Add SGX_IOC_ENCLAVE_CREATE
On Thu, 16 Jul 2020 08:52:51 -0500, Jarkko Sakkinen
<jarkko.sakkinen@...ux.intel.com> wrote:
> Add an ioctl that performs ENCLS[ECREATE], which creates SGX Enclave
> Control Structure for the enclave. SECS contains attributes about the
> enclave that are used by the hardware and cannot be directly accessed by
> software, as SECS resides in the EPC.
>
> One essential field in SECS is a field that stores the SHA256 of the
> measured enclave pages. This field, MRENCLAVE, is initialized by the
> ECREATE instruction and updated by every EADD and EEXTEND operation.
> Finally, EINIT locks down the value.
>
> Acked-by: Jethro Beekman <jethro@...tanix.com>
> Tested-by: Jethro Beekman <jethro@...tanix.com>
> Tested-by: Haitao Huang <haitao.huang@...ux.intel.com>
> Tested-by: Chunyang Hui <sanqian.hcy@...fin.com>
> Tested-by: Jordan Hand <jorhand@...ux.microsoft.com>
> Tested-by: Nathaniel McCallum <npmccallum@...hat.com>
> Tested-by: Seth Moore <sethmo@...gle.com>
> Co-developed-by: Sean Christopherson <sean.j.christopherson@...el.com>
> Signed-off-by: Sean Christopherson <sean.j.christopherson@...el.com>
> Co-developed-by: Suresh Siddha <suresh.b.siddha@...el.com>
> Signed-off-by: Suresh Siddha <suresh.b.siddha@...el.com>
> Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
> ---
> .../userspace-api/ioctl/ioctl-number.rst | 1 +
> arch/x86/include/uapi/asm/sgx.h | 25 ++
> arch/x86/kernel/cpu/sgx/Makefile | 1 +
> arch/x86/kernel/cpu/sgx/driver.c | 12 +
> arch/x86/kernel/cpu/sgx/driver.h | 1 +
> arch/x86/kernel/cpu/sgx/ioctl.c | 226 ++++++++++++++++++
> 6 files changed, 266 insertions(+)
> create mode 100644 arch/x86/include/uapi/asm/sgx.h
> create mode 100644 arch/x86/kernel/cpu/sgx/ioctl.c
>
> diff --git a/Documentation/userspace-api/ioctl/ioctl-number.rst
> b/Documentation/userspace-api/ioctl/ioctl-number.rst
> index 59472cd6a11d..35f713e3a267 100644
> --- a/Documentation/userspace-api/ioctl/ioctl-number.rst
> +++ b/Documentation/userspace-api/ioctl/ioctl-number.rst
> @@ -323,6 +323,7 @@ Code Seq# Include
> File Comments
> <mailto:tlewis@...dspring.com>
> 0xA3 90-9F linux/dtlk.h
> 0xA4 00-1F uapi/linux/tee.h
> Generic TEE subsystem
> +0xA4 00-1F uapi/asm/sgx.h
> Intel SGX subsystem (a legit conflict as TEE and SGX do not co-exist)
> 0xAA 00-3F linux/uapi/linux/userfaultfd.h
> 0xAB 00-1F linux/nbd.h
> 0xAC 00-1F linux/raw.h
> diff --git a/arch/x86/include/uapi/asm/sgx.h
> b/arch/x86/include/uapi/asm/sgx.h
> new file mode 100644
> index 000000000000..3787d278e84b
> --- /dev/null
> +++ b/arch/x86/include/uapi/asm/sgx.h
> @@ -0,0 +1,25 @@
> +/* SPDX-License-Identifier: (GPL-2.0 OR BSD-3-Clause) WITH
> Linux-syscall-note */
> +/*
> + * Copyright(c) 2016-19 Intel Corporation.
> + */
> +#ifndef _UAPI_ASM_X86_SGX_H
> +#define _UAPI_ASM_X86_SGX_H
> +
> +#include <linux/types.h>
> +#include <linux/ioctl.h>
> +
> +#define SGX_MAGIC 0xA4
> +
> +#define SGX_IOC_ENCLAVE_CREATE \
> + _IOW(SGX_MAGIC, 0x00, struct sgx_enclave_create)
> +
> +/**
> + * struct sgx_enclave_create - parameter structure for the
> + * %SGX_IOC_ENCLAVE_CREATE ioctl
> + * @src: address for the SECS page data
> + */
> +struct sgx_enclave_create {
> + __u64 src;
> +};
> +
> +#endif /* _UAPI_ASM_X86_SGX_H */
> diff --git a/arch/x86/kernel/cpu/sgx/Makefile
> b/arch/x86/kernel/cpu/sgx/Makefile
> index 3fc451120735..91d3dc784a29 100644
> --- a/arch/x86/kernel/cpu/sgx/Makefile
> +++ b/arch/x86/kernel/cpu/sgx/Makefile
> @@ -1,4 +1,5 @@
> obj-y += \
> driver.o \
> encl.o \
> + ioctl.o \
> main.o
> diff --git a/arch/x86/kernel/cpu/sgx/driver.c
> b/arch/x86/kernel/cpu/sgx/driver.c
> index b52520407f5b..5559bc18de41 100644
> --- a/arch/x86/kernel/cpu/sgx/driver.c
> +++ b/arch/x86/kernel/cpu/sgx/driver.c
> @@ -118,10 +118,22 @@ static unsigned long sgx_get_unmapped_area(struct
> file *file,
> return current->mm->get_unmapped_area(file, addr, len, pgoff, flags);
> }
> +#ifdef CONFIG_COMPAT
> +static long sgx_compat_ioctl(struct file *filep, unsigned int cmd,
> + unsigned long arg)
> +{
> + return sgx_ioctl(filep, cmd, arg);
> +}
> +#endif
> +
> static const struct file_operations sgx_encl_fops = {
> .owner = THIS_MODULE,
> .open = sgx_open,
> .release = sgx_release,
> + .unlocked_ioctl = sgx_ioctl,
> +#ifdef CONFIG_COMPAT
> + .compat_ioctl = sgx_compat_ioctl,
> +#endif
> .mmap = sgx_mmap,
> .get_unmapped_area = sgx_get_unmapped_area,
> };
> diff --git a/arch/x86/kernel/cpu/sgx/driver.h
> b/arch/x86/kernel/cpu/sgx/driver.h
> index f7ce40dedc91..e4063923115b 100644
> --- a/arch/x86/kernel/cpu/sgx/driver.h
> +++ b/arch/x86/kernel/cpu/sgx/driver.h
> @@ -9,6 +9,7 @@
> #include <linux/rwsem.h>
> #include <linux/sched.h>
> #include <linux/workqueue.h>
> +#include <uapi/asm/sgx.h>
> #include "sgx.h"
> #define SGX_EINIT_SPIN_COUNT 20
> diff --git a/arch/x86/kernel/cpu/sgx/ioctl.c
> b/arch/x86/kernel/cpu/sgx/ioctl.c
> new file mode 100644
> index 000000000000..7981c411b05a
> --- /dev/null
> +++ b/arch/x86/kernel/cpu/sgx/ioctl.c
> @@ -0,0 +1,226 @@
> +// SPDX-License-Identifier: (GPL-2.0 OR BSD-3-Clause)
> +// Copyright(c) 2016-19 Intel Corporation.
> +
> +#include <asm/mman.h>
> +#include <linux/mman.h>
> +#include <linux/delay.h>
> +#include <linux/file.h>
> +#include <linux/hashtable.h>
> +#include <linux/highmem.h>
> +#include <linux/ratelimit.h>
> +#include <linux/sched/signal.h>
> +#include <linux/shmem_fs.h>
> +#include <linux/slab.h>
> +#include <linux/suspend.h>
> +#include "driver.h"
> +#include "encl.h"
> +#include "encls.h"
> +
> +static u32 sgx_calc_ssa_frame_size(u32 miscselect, u64 xfrm)
> +{
> + u32 size_max = PAGE_SIZE;
> + u32 size;
> + int i;
> +
> + for (i = 2; i < 64; i++) {
> + if (!((1 << i) & xfrm))
> + continue;
> +
Potential overflow for signed integer shift. Originally spotted and fixed
in OOT from Colin I. K.: https://github.com/intel/linux-sgx-driver/pull/16
Thanks
Haitao
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