Implements a simple framework for hosting in-kernel LE by using the user
space helper framework.
Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@xxxxxxxxxxxxxxx>
---
drivers/platform/x86/intel_sgx/Kconfig | 2 +
drivers/platform/x86/intel_sgx/Makefile | 1 +
drivers/platform/x86/intel_sgx/sgx.h | 17 ++
drivers/platform/x86/intel_sgx/sgx_ioctl.c | 13 +-
drivers/platform/x86/intel_sgx/sgx_le.c | 313 +++++++++++++++++++++++++++++
drivers/platform/x86/intel_sgx/sgx_main.c | 43 +++-
drivers/platform/x86/intel_sgx/sgx_util.c | 25 +++
7 files changed, 408 insertions(+), 6 deletions(-)
create mode 100644 drivers/platform/x86/intel_sgx/sgx_le.c
diff --git a/drivers/platform/x86/intel_sgx/Kconfig b/drivers/platform/x86/intel_sgx/Kconfig
index 9c445e9f89fa..1a80ca0ddca3 100644
--- a/drivers/platform/x86/intel_sgx/Kconfig
+++ b/drivers/platform/x86/intel_sgx/Kconfig
@@ -9,6 +9,8 @@ config INTEL_SGX
default n
depends on X86_64 && CPU_SUP_INTEL
select MMU_NOTIFIER
+ select CRYPTO
+ select CRYPTO_SHA256
---help---
Intel(R) SGX is a set of CPU instructions that can be used by
applications to set aside private regions of code and data. The code
diff --git a/drivers/platform/x86/intel_sgx/Makefile b/drivers/platform/x86/intel_sgx/Makefile
index 39c0a5ad242c..34abcdd8eb72 100644
--- a/drivers/platform/x86/intel_sgx/Makefile
+++ b/drivers/platform/x86/intel_sgx/Makefile
@@ -11,6 +11,7 @@ intel_sgx-$(CONFIG_INTEL_SGX) += \
sgx_page_cache.o \
sgx_util.o \
sgx_vma.o \
+ sgx_le.o \
sgx_le_proxy_piggy.o
$(eval $(call config_filename,INTEL_SGX_SIGNING_KEY))
diff --git a/drivers/platform/x86/intel_sgx/sgx.h b/drivers/platform/x86/intel_sgx/sgx.h
index 24140a32cbbc..9d3abbe96806 100644
--- a/drivers/platform/x86/intel_sgx/sgx.h
+++ b/drivers/platform/x86/intel_sgx/sgx.h
@@ -68,6 +68,7 @@
#include <linux/workqueue.h>
#include <linux/mmu_notifier.h>
#include <linux/radix-tree.h>
+#include <crypto/hash.h>
#include <asm/sgx.h>
#define SGX_EINIT_SPIN_COUNT 20
@@ -177,6 +178,7 @@ extern u64 sgx_xfrm_mask;
extern u32 sgx_misc_reserved;
extern u32 sgx_xsave_size_tbl[64];
+extern const struct file_operations sgx_fops;
extern const struct vm_operations_struct sgx_vm_ops;
#define sgx_pr_ratelimited(level, encl, fmt, ...) \
@@ -235,6 +237,9 @@ struct sgx_encl_page *sgx_fault_page(struct vm_area_struct *vma,
unsigned int flags);
+int sgx_get_key_hash(struct crypto_shash *tfm, const void *modulus, void *hash);
+int sgx_get_key_hash_simple(const void *modulus, void *hash);
+
extern struct mutex sgx_tgid_ctx_mutex;
extern struct list_head sgx_tgid_ctx_list;
extern atomic_t sgx_va_pages_cnt;
@@ -249,4 +254,16 @@ void sgx_put_page(void *epc_page_vaddr);
void sgx_eblock(struct sgx_encl *encl, struct sgx_epc_page *epc_page);
void sgx_etrack(struct sgx_encl *encl);
+extern struct sgx_le_ctx sgx_le_ctx;
+
+int sgx_le_init(struct sgx_le_ctx *ctx);
+void sgx_le_exit(struct sgx_le_ctx *ctx);
+void sgx_le_stop(struct sgx_le_ctx *ctx);
+int sgx_le_start(struct sgx_le_ctx *ctx);
+
+int sgx_le_get_token(struct sgx_le_ctx *ctx,
+ const struct sgx_encl *encl,
+ const struct sgx_sigstruct *sigstruct,
+ struct sgx_einittoken *token);
+
#endif /* __ARCH_X86_INTEL_SGX_H__ */
diff --git a/drivers/platform/x86/intel_sgx/sgx_ioctl.c b/drivers/platform/x86/intel_sgx/sgx_ioctl.c
index 3fcef914005f..9317b2603212 100644
--- a/drivers/platform/x86/intel_sgx/sgx_ioctl.c
+++ b/drivers/platform/x86/intel_sgx/sgx_ioctl.c
@@ -69,7 +69,7 @@
#include <linux/hashtable.h>
#include <linux/shmem_fs.h>
-static int sgx_get_encl(unsigned long addr, struct sgx_encl **encl)
+static int sgx_encl_get(unsigned long addr, struct sgx_encl **encl)
{
struct mm_struct *mm = current->mm;
struct vm_area_struct *vma;
@@ -156,7 +156,7 @@ static long sgx_ioc_enclave_add_page(struct file *filep, unsigned int cmd,
void *data;
int ret;
- ret = sgx_get_encl(addp->addr, &encl);
+ ret = sgx_encl_get(addp->addr, &encl);
if (ret)
return ret;
@@ -227,11 +227,16 @@ static long sgx_ioc_enclave_init(struct file *filep, unsigned int cmd,
if (ret)
goto out;
- ret = sgx_get_encl(encl_id, &encl);
+ ret = sgx_encl_get(encl_id, &encl);
if (ret)
goto out;
- ret = sgx_encl_init(encl, sigstruct, einittoken);
+ if (!(initp->flags && SGX_ENCLAVE_INIT_ARCH))
+ ret = sgx_le_get_token(&sgx_le_ctx, encl, sigstruct,
+ einittoken);
+
+ if (!ret)
+ ret = sgx_encl_init(encl, sigstruct, einittoken);
kref_put(&encl->refcount, sgx_encl_release);
diff --git a/drivers/platform/x86/intel_sgx/sgx_le.c b/drivers/platform/x86/intel_sgx/sgx_le.c
new file mode 100644
index 000000000000..68b18df59b0e
--- /dev/null
+++ b/drivers/platform/x86/intel_sgx/sgx_le.c
@@ -0,0 +1,313 @@
+/*
+ * This file is provided under a dual BSD/GPLv2 license. When using or
+ * redistributing this file, you may do so under either license.
+ *
+ * GPL LICENSE SUMMARY
+ *
+ * Copyright(c) 2017 Intel Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of version 2 of the GNU General Public License as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * Contact Information:
+ * Jarkko Sakkinen <jarkko.sakkinen@xxxxxxxxxxxxxxx>
+ * Intel Finland Oy - BIC 0357606-4 - Westendinkatu 7, 02160 Espoo
+ *
+ * BSD LICENSE
+ *
+ * Copyright(c) 2016 Intel Corporation.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * * Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in
+ * the documentation and/or other materials provided with the
+ * distribution.
+ * * Neither the name of Intel Corporation nor the names of its
+ * contributors may be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * Authors:
+ *
+ * Jarkko Sakkinen <jarkko.sakkinen@xxxxxxxxxxxxxxx>
+ */
+
+#include <linux/file.h>
+#include <linux/fs.h>
+#include <linux/kmod.h>
+#include <linux/mutex.h>
+#include <linux/wait.h>
+#include <linux/pipe_fs_i.h>
+#include <linux/sched/signal.h>
+#include <linux/shmem_fs.h>
+#include <linux/anon_inodes.h>
+#include "sgx.h"
+
+#define SGX_LE_PROXY_PATH "/proc/self/fd/3"
+#define SGX_LE_PROXY_FD 3
+#define SGX_LE_DEV_FD 4
+
+extern unsigned char sgx_le_proxy[];
+extern unsigned char sgx_le_proxy_end[];
+
+struct sgx_le_ctx {
+ struct pid *tgid;
+ char *argv[2];
+ struct file *pipes[2];
+ struct crypto_shash *tfm;
+ struct mutex lock;
+};
+
+struct sgx_le_ctx sgx_le_ctx;
+
+static int sgx_le_create_pipe(struct sgx_le_ctx *ctx,
+ unsigned int fd)
+{
+ struct file *files[2];
+ int ret;
+
+ ret = create_pipe_files(files, 0);
+ if (ret)
+ goto out;
+
+ ctx->pipes[fd] = files[fd ^ 1];
+ ret = replace_fd(fd, files[fd], 0);
+ fput(files[fd]);
+
+out:
+ return ret;
+}
+
+static int sgx_le_read(struct file *file, void *data, unsigned int len)
+{
+ ssize_t ret;
+ loff_t pos = 0;
+
+ ret = kernel_read(file, data, len, &pos);
+
+ if (ret != len && ret >= 0)
+ return -ENOMEM;
+
+ if (ret < 0)
+ return ret;
+
+ return 0;
+}
+
+static int sgx_le_write(struct file *file, const void *data,
+ unsigned int len)
+{
+ ssize_t ret;
+ loff_t pos = 0;
+
+ ret = kernel_write(file, data, len, &pos);
+
+ if (ret != len && ret >= 0)
+ return -ENOMEM;
+
+ if (ret < 0)
+ return ret;
+
+ return 0;
+}
+
+static int sgx_le_task_init(struct subprocess_info *subinfo, struct cred *new)
+{
+ struct sgx_le_ctx *ctx =
+ (struct sgx_le_ctx *)subinfo->data;
+ unsigned long len;
+ struct file *tmp_filp;
+ int ret;
+
+ len = (unsigned long)&sgx_le_proxy_end - (unsigned long)&sgx_le_proxy;
+
+ tmp_filp = shmem_file_setup("[sgx_le_proxy]", len, 0);
+ if (IS_ERR(tmp_filp)) {
+ ret = PTR_ERR(tmp_filp);
+ return ret;
+ }
+ ret = replace_fd(SGX_LE_PROXY_FD, tmp_filp, 0);
+ fput(tmp_filp);
+ if (ret < 0)
+ return ret;
+
+ ret = sgx_le_write(tmp_filp, &sgx_le_proxy, len);
+ if (ret)
+ return ret;
+
+ tmp_filp = anon_inode_getfile("[/dev/sgx]", &sgx_fops, NULL, O_RDWR);
+ if (IS_ERR(tmp_filp))
+ return PTR_ERR(tmp_filp);
+ ret = replace_fd(SGX_LE_DEV_FD, tmp_filp, 0);
+ fput(tmp_filp);
+ if (ret < 0)
+ return ret;
+
+ ret = sgx_le_create_pipe(ctx, 0);
+ if (ret < 0)
+ return ret;
+
+ ret = sgx_le_create_pipe(ctx, 1);
+ if (ret < 0)
+ return ret;
+
+ ctx->tgid = get_pid(task_tgid(current));
+
+ return 0;
+}
+
+static void __sgx_le_stop(struct sgx_le_ctx *ctx)
+{
+ int i;
+
+ if (ctx->tgid)
+ kill_pid(ctx->tgid, SIGKILL, 1);
+
+ for (i = 0; i < ARRAY_SIZE(ctx->pipes); i++) {
+ if (ctx->pipes[i]) {
+ fput(ctx->pipes[i]);
+ ctx->pipes[i] = NULL;
+ }
+ }
+
+ if (ctx->tgid) {
+ put_pid(ctx->tgid);
+ ctx->tgid = NULL;
+ }
+}
+
+
+void sgx_le_stop(struct sgx_le_ctx *ctx)
+{
+ mutex_lock(&ctx->lock);
+ __sgx_le_stop(ctx);
+ mutex_unlock(&ctx->lock);
+}
+
+static int __sgx_le_start(struct sgx_le_ctx *ctx)
+{
+ struct subprocess_info *subinfo;
+ int ret;
+
+ if (ctx->tgid)
+ return 0;
+
+ ctx->argv[0] = SGX_LE_PROXY_PATH;
+ ctx->argv[1] = NULL;
+
+ subinfo = call_usermodehelper_setup(ctx->argv[0], ctx->argv,
+ NULL, GFP_KERNEL, sgx_le_task_init,
+ NULL, &sgx_le_ctx);
+ if (!subinfo)
+ return -ENOMEM;
+
+ ret = call_usermodehelper_exec(subinfo, UMH_WAIT_EXEC);
+ if (ret) {
+ __sgx_le_stop(ctx);
+ return ret;
+ }
+
+ return 0;
+}
+
+int sgx_le_start(struct sgx_le_ctx *ctx)
+{
+ int ret;
+
+ mutex_lock(&ctx->lock);
+ ret = __sgx_le_start(ctx);
+ mutex_unlock(&ctx->lock);
+
+ return ret;
+}
+
+int sgx_le_init(struct sgx_le_ctx *ctx)
+{
+ struct crypto_shash *tfm;
+
+ tfm = crypto_alloc_shash("sha256", 0, CRYPTO_ALG_ASYNC);
+ if (IS_ERR(tfm))
+ return PTR_ERR(tfm);
+
+ ctx->tfm = tfm;
+ mutex_init(&ctx->lock);
+
+ return 0;
+}
+
+void sgx_le_exit(struct sgx_le_ctx *ctx)
+{
+ mutex_lock(&ctx->lock);
+ crypto_free_shash(ctx->tfm);
+ mutex_unlock(&ctx->lock);
+}
+
+static int __sgx_le_get_token(struct sgx_le_ctx *ctx,
+ const struct sgx_encl *encl,
+ const struct sgx_sigstruct *sigstruct,
+ struct sgx_einittoken *token)
+{
+ u8 mrsigner[32];
+ ssize_t ret;
+
+ if (!ctx->tgid)
+ return -EIO;
+
+ ret = sgx_get_key_hash(ctx->tfm, sigstruct->modulus, mrsigner);
+ if (ret)
+ return ret;
+
+ ret = sgx_le_write(ctx->pipes[0], sigstruct->body.mrenclave, 32);
+ if (ret)
+ return ret;
+
+ ret = sgx_le_write(ctx->pipes[0], mrsigner, 32);
+ if (ret)
+ return ret;
+
+ ret = sgx_le_write(ctx->pipes[0], &encl->attributes, sizeof(uint64_t));
+ if (ret)
+ return ret;
+
+ ret = sgx_le_write(ctx->pipes[0], &encl->xfrm, sizeof(uint64_t));
+ if (ret)
+ return ret;
+
+ return sgx_le_read(ctx->pipes[1], token, sizeof(*token));
+}
+
+int sgx_le_get_token(struct sgx_le_ctx *ctx,
+ const struct sgx_encl *encl,
+ const struct sgx_sigstruct *sigstruct,
+ struct sgx_einittoken *token)
+{
+ int ret;
+
+ mutex_lock(&ctx->lock);
+ ret = __sgx_le_get_token(ctx, encl, sigstruct, token);
+ mutex_unlock(&ctx->lock);
+
+ return ret;
+}
diff --git a/drivers/platform/x86/intel_sgx/sgx_main.c b/drivers/platform/x86/intel_sgx/sgx_main.c
index 1c42a0323a78..42fc9ecaf593 100644
--- a/drivers/platform/x86/intel_sgx/sgx_main.c
+++ b/drivers/platform/x86/intel_sgx/sgx_main.c
@@ -90,6 +90,35 @@ u64 sgx_xfrm_mask = 0x3;
u32 sgx_misc_reserved;
u32 sgx_xsave_size_tbl[64];
+static DECLARE_RWSEM(sgx_file_sem);
+
+static int sgx_open(struct inode *inode, struct file *file)
+{
+ int ret;
+
+ down_read(&sgx_file_sem);
+
+ ret = sgx_le_start(&sgx_le_ctx);
+ if (ret) {
+ up_read(&sgx_file_sem);
+ return ret;
+ }
+
+ return 0;
+}
+
+static int sgx_release(struct inode *inode, struct file *file)
+{
+ up_read(&sgx_file_sem);
+
+ if (down_write_trylock(&sgx_file_sem)) {
+ sgx_le_stop(&sgx_le_ctx);
+ up_write(&sgx_file_sem);
+ }
+
+ return 0;
+}
+
#ifdef CONFIG_COMPAT
long sgx_compat_ioctl(struct file *filep, unsigned int cmd, unsigned long arg)
{
@@ -142,8 +171,10 @@ static unsigned long sgx_get_unmapped_area(struct file *file,
return addr;
}
-static const struct file_operations sgx_fops = {
+const struct file_operations sgx_fops = {
.owner = THIS_MODULE,
+ .open = sgx_open,
+ .release = sgx_release,
.unlocked_ioctl = sgx_ioctl,
#ifdef CONFIG_COMPAT
.compat_ioctl = sgx_compat_ioctl,
@@ -313,11 +344,17 @@ static int sgx_dev_init(struct device *parent)
goto out_iounmap;
}
- ret = cdev_device_add(&sgx_dev->cdev, &sgx_dev->dev);
+ ret = sgx_le_init(&sgx_le_ctx);
if (ret)
goto out_workqueue;
+ ret = cdev_device_add(&sgx_dev->cdev, &sgx_dev->dev);
+ if (ret)
+ goto out_le;
+
return 0;
+out_le:
+ sgx_le_exit(&sgx_le_ctx);
out_workqueue:
destroy_workqueue(sgx_add_page_wq);
out_iounmap:
@@ -381,6 +418,8 @@ static int sgx_drv_remove(struct platform_device *pdev)
cdev_device_del(&ctx->cdev, &ctx->dev);
+ sgx_le_exit(&sgx_le_ctx);
+
destroy_workqueue(sgx_add_page_wq);
#ifdef CONFIG_X86_64
for (i = 0; i < sgx_nr_epc_banks; i++)
diff --git a/drivers/platform/x86/intel_sgx/sgx_util.c b/drivers/platform/x86/intel_sgx/sgx_util.c
index 6ef79499100f..6c1f06d1978a 100644
--- a/drivers/platform/x86/intel_sgx/sgx_util.c
+++ b/drivers/platform/x86/intel_sgx/sgx_util.c
@@ -370,3 +370,28 @@ void sgx_etrack(struct sgx_encl *encl)
sgx_invalidate(encl, true);
}
}
+
+int sgx_get_key_hash(struct crypto_shash *tfm, const void *modulus, void *hash)
+{
+ SHASH_DESC_ON_STACK(shash, tfm);
+
+ shash->tfm = tfm;
+ shash->flags = CRYPTO_TFM_REQ_MAY_SLEEP;
+
+ return crypto_shash_digest(shash, modulus, SGX_MODULUS_SIZE, hash);
+}
+
+int sgx_get_key_hash_simple(const void *modulus, void *hash)
+{
+ struct crypto_shash *tfm;
+ int ret;
+
+ tfm = crypto_alloc_shash("sha256", 0, CRYPTO_ALG_ASYNC);
+ if (IS_ERR(tfm))
+ return PTR_ERR(tfm);
+
+ ret = sgx_get_key_hash(tfm, modulus, hash);
+
+ crypto_free_shash(tfm);
+ return ret;
+}
--
2.14.1
