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- /* -*- mode:c; c-file-style:"k&r"; c-basic-offset: 4; tab-width:4; indent-tabs-mode:nil; mode:auto-fill; fill-column:78; -*- */
- /* vim: set ts=4 sw=4 et tw=78 fo=cqt wm=0: */
- /* Copyright (C) 2014 OSCAR lab, Stony Brook University
- This file is part of Graphene Library OS.
- Graphene Library OS is free software: you can redistribute it and/or
- modify it under the terms of the GNU General Public License
- as published by the Free Software Foundation, either version 3 of the
- License, or (at your option) any later version.
- Graphene Library OS 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.
- You should have received a copy of the GNU General Public License
- along with this program. If not, see <http://www.gnu.org/licenses/>. */
- /*
- * db_process.c
- *
- * This source file contains functions to create a child process and terminate
- * the running process. Child does not inherit any objects or memory from its
- * parent pricess. A Parent process may not modify the execution of its
- * children. It can wait for a child to exit using its handle. Also, parent and
- * child may communicate through I/O streams provided by the parent to the child
- * at creation.
- */
- #include <pal_linux.h>
- #include <pal_rtld.h>
- #include "sgx_internal.h"
- #include "sgx_tls.h"
- #include "sgx_enclave.h"
- #include <asm/fcntl.h>
- #include <asm/errno.h>
- #include <linux/fs.h>
- #define PAL_LOADER XSTRINGIFY(LOADER)
- struct proc_args {
- PAL_SEC_STR exec_name;
- unsigned int instance_id;
- unsigned int parent_process_id;
- unsigned int proc_fds[3];
- PAL_SEC_STR pipe_prefix;
- unsigned int mcast_port;
- };
- int sgx_create_process (const char * uri, int nargs, const char ** args,
- int * retfds)
- {
- int ret, rete, child;
- int fds[6] = { -1, -1, -1, -1, -1, -1 };
- if (!uri || !strpartcmp_static(uri, "file:"))
- return -PAL_ERROR_INVAL;
- if (IS_ERR((ret = INLINE_SYSCALL(pipe, 1, &fds[0]))) ||
- IS_ERR((ret = INLINE_SYSCALL(pipe, 1, &fds[2]))) ||
- IS_ERR((ret = INLINE_SYSCALL(socketpair, 4, AF_UNIX, SOCK_STREAM,
- 0, &fds[4])))) {
- ret = -PAL_ERROR_DENIED;
- goto out;
- }
- int proc_fds[2][3] = {
- { fds[0], fds[3], fds[4] },
- { fds[2], fds[1], fds[5] },
- };
- const char ** argv = __alloca(sizeof(const char *) * (nargs + 2));
- argv[0] = PAL_LOADER;
- memcpy(argv + 1, args, sizeof(const char *) * nargs);
- argv[nargs + 1] = NULL;
- ret = ARCH_VFORK();
- if (IS_ERR(ret)) {
- ret = -PAL_ERROR_DENIED;
- goto out;
- }
- if (!ret) {
- for (int i = 0 ; i < 3 ; i++)
- INLINE_SYSCALL(close, 1, proc_fds[1][i]);
- INLINE_SYSCALL(close, 1, PROC_INIT_FD);
- rete = INLINE_SYSCALL(dup2, 2, proc_fds[0][0], PROC_INIT_FD);
- if (IS_ERR(rete))
- goto out_child;
- rete = INLINE_SYSCALL(execve, 3, PAL_LOADER, argv, NULL);
- /* shouldn't get to here */
- SGX_DBG(DBG_E, "unexpected failure of new process\n");
- out_child:
- asm("hlt");
- return 0;
- }
- if (IS_ERR(rete)) {
- ret = -PAL_ERROR_DENIED;
- goto out;
- }
- child = ret;
- for (int i = 0 ; i < 3 ; i++)
- INLINE_SYSCALL(close, 1, proc_fds[0][i]);
- int pipe_in = proc_fds[1][0], pipe_out = proc_fds[1][1];
- struct pal_sec * pal_sec = ¤t_enclave->pal_sec;
- struct proc_args proc_args;
- memcpy(proc_args.exec_name, uri, sizeof(PAL_SEC_STR));
- proc_args.instance_id = pal_sec->instance_id;
- proc_args.parent_process_id = pal_sec->pid;
- proc_args.proc_fds[0] = proc_fds[0][0];
- proc_args.proc_fds[1] = proc_fds[0][1];
- proc_args.proc_fds[2] = proc_fds[0][2];
- memcpy(proc_args.pipe_prefix, pal_sec->pipe_prefix, sizeof(PAL_SEC_STR));
- proc_args.mcast_port = pal_sec->mcast_port;
- ret = INLINE_SYSCALL(write, 3, pipe_out, &proc_args,
- sizeof(struct proc_args));
- if (IS_ERR(ret) || ret < sizeof(struct proc_args)) {
- ret = -PAL_ERROR_DENIED;
- goto out;
- }
- ret = INLINE_SYSCALL(read, 3, pipe_in, &rete, sizeof(int));
- if (IS_ERR(ret) || ret < sizeof(int)) {
- ret = -PAL_ERROR_DENIED;
- goto out;
- }
- if (rete < 0) {
- ret = rete;
- goto out;
- }
- for (int i = 0 ; i < 3 ; i++) {
- INLINE_SYSCALL(fcntl, 3, proc_fds[1][i], F_SETFD, FD_CLOEXEC);
- retfds[i] = proc_fds[1][i];
- }
- ret = child;
- out:
- if (ret < 0) {
- for (int i = 0 ; i < 6 ; i++)
- if (fds[i] >= 0)
- INLINE_SYSCALL(close, 1, fds[i]);
- }
- return ret;
- }
- int sgx_init_child_process (struct pal_sec * pal_sec)
- {
- struct proc_args proc_args;
- int ret = INLINE_SYSCALL(read, 3, PROC_INIT_FD, &proc_args,
- sizeof(struct proc_args));
- if (IS_ERR(ret) && ERRNO(ret) == EBADF)
- return 0;
- if (IS_ERR(ret))
- return -PAL_ERROR_DENIED;
- int child_status = 0;
- ret = INLINE_SYSCALL(write, 3, proc_args.proc_fds[1], &child_status,
- sizeof(int));
- if (IS_ERR(ret))
- return -PAL_ERROR_DENIED;
- memcpy(pal_sec->exec_name, proc_args.exec_name, sizeof(PAL_SEC_STR));
- pal_sec->instance_id = proc_args.instance_id;
- pal_sec->ppid = proc_args.parent_process_id;
- pal_sec->proc_fds[0] = proc_args.proc_fds[0];
- pal_sec->proc_fds[1] = proc_args.proc_fds[1];
- pal_sec->proc_fds[2] = proc_args.proc_fds[2];
- memcpy(pal_sec->pipe_prefix, proc_args.pipe_prefix, sizeof(PAL_SEC_STR));
- pal_sec->mcast_port = proc_args.mcast_port;
- return 1;
- }
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