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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_defs.h"
- #include "pal_linux_defs.h"
- #include "pal.h"
- #include "pal_internal.h"
- #include "pal_linux.h"
- #include "pal_debug.h"
- #include "pal_error.h"
- #include "pal_security.h"
- #include "graphene.h"
- #include "graphene-ipc.h"
- #include "api.h"
- #include <linux/sched.h>
- #include <linux/types.h>
- typedef __kernel_pid_t pid_t;
- #include <asm/fcntl.h>
- #include <sys/socket.h>
- #include <asm-errno.h>
- #ifndef SEEK_SET
- # define SEEK_SET 0
- #endif
- int _DkProcessCreate (PAL_HANDLE * handle,
- const char * uri, int flags, const char ** args)
- {
- int ret, rete;
- const char * manifest_uri = pal_config.manifest;
- PAL_HANDLE manifest = pal_config.manifest_handle;
- int manifest_fd = -1;
- const char * exec_uri = NULL;
- PAL_HANDLE exec = NULL;
- int exec_fd = -1;
- bool noexec = false;
- if (uri) {
- exec_uri = uri;
- if ((ret = _DkStreamOpen(&exec, uri, PAL_ACCESS_RDONLY, 0, 0, 0)) < 0)
- return ret;
- if (check_elf_object(exec) < 0) {
- manifest = exec;
- manifest_uri = uri;
- exec = NULL;
- exec_uri = NULL;
- }
- exec_fd = exec->file.fd;
- INLINE_SYSCALL(fcntl, 3, exec_fd, F_SETFD, 0);
- } else {
- noexec = true;
- }
- if (manifest) {
- manifest_fd = manifest->file.fd;
- INLINE_SYSCALL(fcntl, 3, manifest_fd, F_SETFD, 0);
- }
- int fds[6] = { -1, -1, -1, -1, -1, -1 };
- if (IS_ERR((ret = INLINE_SYSCALL(pipe2, 2, &fds[0], 0))) ||
- IS_ERR((ret = INLINE_SYSCALL(pipe2, 2, &fds[2], 0))) ||
- 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] },
- };
- int argc = 0;
- if (args) for (; args[argc] ; argc++);
- const char ** argv = __alloca(sizeof(const char *) * (argc + 2));
- argv[0] = PAL_LOADER;
- if (args) memcpy(&argv[1], args, sizeof(const char *) * argc);
- argv[argc + 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;
- if (manifest_fd >= 0)
- INLINE_SYSCALL(fcntl, 3, manifest_fd, F_SETFD, 0);
- rete = INLINE_SYSCALL(execve, 3, PAL_LOADER, argv, NULL);
- /* shouldn't get to here */
- printf("unexpected failure of new process\n");
- out_child:
- asm("hlt");
- return 0;
- }
- if (IS_ERR(rete)) {
- ret = -PAL_ERROR_DENIED;
- goto out;
- }
- 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];
- unsigned short data_size = 0;
- unsigned short exec_uri_offset = 0, manifest_uri_offset = 0;
- if (exec_uri) {
- int len = strlen(exec_uri);
- exec_uri_offset = data_size;
- data_size += len + 1;
- }
- if (manifest_fd >= 0) {
- int len = strlen(manifest_uri);
- manifest_uri_offset = data_size;
- data_size += len + 1;
- }
- struct pal_proc_args * proc_args = __alloca(sizeof(struct pal_proc_args) +
- data_size);
- void * data = ((void *) proc_args) + sizeof(struct pal_proc_args);
- memset(proc_args, 0, sizeof(struct pal_proc_args));
- memcpy(&proc_args->pal_sec_info, &pal_sec_info, sizeof(struct pal_sec_info));
- proc_args->pal_sec_info._dl_debug_state = NULL;
- proc_args->pal_sec_info._r_debug = NULL;
- 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];
- proc_args->parent_pid = pal_linux_config.pid;
- proc_args->exec_fd = (exec_fd == -1) ? PAL_IDX_POISON : exec_fd;
- proc_args->noexec = noexec;
- proc_args->manifest_fd = (manifest_fd == -1) ? PAL_IDX_POISON : manifest_fd;
- if (exec_uri)
- memcpy(data + (proc_args->exec_uri_offset = exec_uri_offset),
- exec_uri, strlen(exec_uri) + 1);
- if (manifest_uri)
- memcpy(data + (proc_args->manifest_uri_offset = manifest_uri_offset),
- manifest_uri, strlen(manifest_uri) + 1);
- proc_args->data_size = data_size;
- ret = INLINE_SYSCALL(write, 3, pipe_out, proc_args,
- sizeof(struct pal_proc_args) + data_size);
- if (IS_ERR(ret) || ret < sizeof(struct pal_proc_args) + data_size) {
- 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);
- int pid = ret;
- PAL_HANDLE hdl = malloc(HANDLE_SIZE(process));
- SET_HANDLE_TYPE(hdl, process);
- hdl->__in.flags |= RFD(0)|WFD(1)|RFD(2)|WFD(2)|WRITEABLE(1)|WRITEABLE(2);
- hdl->process.stream_in = proc_fds[1][0];
- hdl->process.stream_out = proc_fds[1][1];
- hdl->process.cargo = proc_fds[1][2];
- hdl->process.pid = pid;
- hdl->process.nonblocking = PAL_FALSE;
- *handle = hdl;
- ret = 0;
- out:
- if (ret < 0) {
- for (int i = 0 ; i < 6 ; i++)
- if (fds[i] >= 0)
- INLINE_SYSCALL(close, 1, fds[i]);
- }
- return ret;
- }
- int init_child_process (struct pal_proc_args * proc_args, void * proc_data)
- {
- memcpy(&pal_sec_info, &proc_args->pal_sec_info, sizeof(pal_sec_info));
- PAL_HANDLE parent = malloc(HANDLE_SIZE(process));
- SET_HANDLE_TYPE(parent, process);
- parent->__in.flags |= RFD(0)|WFD(1)|RFD(2)|WFD(2)|WRITEABLE(1)|WRITEABLE(2);
- parent->process.stream_in = proc_args->proc_fds[0];
- parent->process.stream_out = proc_args->proc_fds[1];
- parent->process.cargo = proc_args->proc_fds[2];
- parent->process.pid = proc_args->parent_pid;
- parent->process.nonblocking = PAL_FALSE;
- __pal_control.parent_process = parent;
- if (proc_args->exec_fd != PAL_IDX_POISON) {
- char * uri = (char *) proc_data + proc_args->exec_uri_offset;
- char * exec_uri = remalloc(uri, strlen(uri) + 1);
- INLINE_SYSCALL(lseek, 3, proc_args->exec_fd, 0, SEEK_SET);
- PAL_HANDLE exec = malloc(HANDLE_SIZE(file));
- SET_HANDLE_TYPE(exec, file);
- exec->__in.flags |= RFD(0);
- exec->file.fd = proc_args->exec_fd;
- exec->file.offset = 0;
- exec->file.append = PAL_FALSE;
- exec->file.pass = PAL_FALSE;
- exec->file.realpath = remalloc(exec_uri + 5, strlen(exec_uri + 5) + 1);
- pal_config.exec = exec_uri;
- pal_config.exec_handle = exec;
- } else {
- pal_linux_config.noexec = proc_args->noexec;
- }
- if (proc_args->manifest_fd != PAL_IDX_POISON) {
- char * uri = (char *) proc_data + proc_args->manifest_uri_offset;
- char * manifest_uri = remalloc(uri, strlen(uri) + 1);
- INLINE_SYSCALL(lseek, 3, proc_args->manifest_fd, 0, SEEK_SET);
- PAL_HANDLE manifest = malloc(HANDLE_SIZE(file));
- SET_HANDLE_TYPE(manifest, file);
- manifest->__in.flags |= RFD(0);
- manifest->file.fd = proc_args->manifest_fd;
- manifest->file.offset = 0;
- manifest->file.append = PAL_FALSE;
- manifest->file.pass = PAL_FALSE;
- manifest->file.realpath = remalloc(manifest_uri + 5,
- strlen(manifest_uri + 5) + 1);
- pal_config.manifest = manifest_uri;
- pal_config.manifest_handle = manifest;
- }
- int child_status = 0;
- int ret = INLINE_SYSCALL(write, 3, proc_args->proc_fds[1], &child_status,
- sizeof(int));
- if (IS_ERR(ret))
- return -PAL_ERROR_DENIED;
- return 0;
- }
- void _DkProcessExit (int exitcode)
- {
- if (__pal_control.parent_process)
- _DkObjectClose(__pal_control.parent_process);
- if (__pal_control.manifest_handle)
- _DkObjectClose(__pal_control.manifest_handle);
- INLINE_SYSCALL(exit_group, 1, exitcode);
- }
- int ioctl_set_graphene (struct config_store * config, int ndefault,
- const struct graphene_user_policy * default_policies);
- static int set_graphene_task (const char * uri, int flags)
- {
- PAL_HANDLE handle = NULL;
- int ret;
- if ((ret = _DkStreamOpen(&handle, uri, PAL_ACCESS_RDONLY, 0, 0, 0)) < 0)
- return ret;
- PAL_STREAM_ATTR attr;
- if ((ret = _DkStreamAttributesQuerybyHandle(handle, &attr)) < 0)
- goto out;
- void * addr = NULL;
- size_t size = attr.size;
- if ((ret = _DkStreamMap(handle, &addr, PAL_PROT_READ, 0,
- ALLOC_ALIGNUP(size))) < 0)
- goto out;
- struct config_store cfg;
- cfg.raw_data = addr;
- cfg.raw_size = size;
- cfg.malloc = malloc;
- cfg.free = free;
- if ((ret = read_config(&cfg, NULL, NULL)) < 0)
- goto out_mem;
- const char * manifest = uri;
- struct graphene_user_policy manifest_policy;
- if (!memcmp(manifest, "file:", 5)) {
- manifest_policy.type = GRAPHENE_FS_PATH | GRAPHENE_FS_READ;
- manifest_policy.value = manifest + 5;
- } else {
- manifest_policy.type = 0;
- }
- if (flags & PAL_SANDBOX_PIPE) {
- do {
- getrand(&pal_sec_info.mcast_port, sizeof(unsigned short));
- } while (pal_sec_info.mcast_port < 1024);
- }
- struct graphene_net_policy mcast_rules[2];
- memset(mcast_rules, 0, sizeof(struct graphene_net_policy) * 2);
- mcast_rules[0].family = AF_INET;
- mcast_rules[0].local.port_begin = pal_sec_info.mcast_port;
- mcast_rules[0].local.port_end = pal_sec_info.mcast_port;
- mcast_rules[0].peer.port_begin = 0;
- mcast_rules[0].peer.port_end = 65535;
- mcast_rules[1].family = AF_INET;
- mcast_rules[1].local.port_begin = 0;
- mcast_rules[1].local.port_end = 65535;
- inet_pton(AF_INET, MCAST_GROUP, &mcast_rules[1].peer.addr);
- mcast_rules[1].peer.port_begin = pal_sec_info.mcast_port;
- mcast_rules[1].peer.port_end = pal_sec_info.mcast_port;
- if (flags & PAL_SANDBOX_PIPE) {
- char pipe_root[sizeof(GRAPHENE_PIPEDIR) + 20];
- char pipe_prefix[9];
- int sandboxid;
- snprintf(pipe_root,
- sizeof(GRAPHENE_PIPEDIR) + 20, GRAPHENE_PIPEDIR "/%08x",
- pal_sec_info.domain_id);
- getrand(&sandboxid, sizeof(int));
- snprintf(pipe_prefix, 9, "%08x", sandboxid);
- struct graphene_user_policy default_policies[] = {
- { .type = GRAPHENE_UNIX_ROOT, .value = pipe_root, },
- { .type = GRAPHENE_UNIX_PREFIX, .value = pipe_prefix, },
- { .type = GRAPHENE_NET_RULE, .value = &mcast_rules[0], },
- { .type = GRAPHENE_NET_RULE, .value = &mcast_rules[1], },
- manifest_policy,
- };
- ret = ioctl_set_graphene(&cfg, manifest_policy.type ? 5 : 4,
- default_policies);
- if (ret < 0)
- goto out_mem;
- memcpy(&pal_sec_info.pipe_prefix, pipe_prefix, 9);
- } else {
- const struct graphene_user_policy default_policies[] = {
- { .type = GRAPHENE_NET_RULE, .value = &mcast_rules[0], },
- { .type = GRAPHENE_NET_RULE, .value = &mcast_rules[1], },
- manifest_policy,
- };
- ret = ioctl_set_graphene(&cfg, manifest_policy.type ? 3 : 2,
- default_policies);
- if (ret < 0)
- goto out_mem;
- }
- pal_config.manifest = manifest;
- _DkObjectClose(pal_config.manifest_handle);
- pal_config.manifest_handle = handle;
- free_config(&cfg);
- out_mem:
- _DkStreamUnmap(cfg.raw_data, ALLOC_ALIGNUP(cfg.raw_size));
- out:
- DkObjectClose(handle);
- return ret;
- }
- int _DkProcessSandboxCreate (const char * manifest, int flags)
- {
- return set_graphene_task(manifest, flags);
- }
- static int proc_read (PAL_HANDLE handle, int offset, int count,
- void * buffer)
- {
- int bytes = INLINE_SYSCALL(read, 3, handle->process.stream_in, buffer,
- count);
- if (IS_ERR(bytes))
- switch(ERRNO(bytes)) {
- case EWOULDBLOCK:
- return-PAL_ERROR_TRYAGAIN;
- case EINTR:
- return -PAL_ERROR_INTERRUPTED;
- default:
- return -PAL_ERROR_DENIED;
- }
- return bytes;
- }
- static int proc_write (PAL_HANDLE handle, int offset, int count,
- const void * buffer)
- {
- int bytes = INLINE_SYSCALL(write, 3, handle->process.stream_out, buffer,
- count);
- if (IS_ERR(bytes))
- switch(ERRNO(bytes)) {
- case EWOULDBLOCK:
- handle->__in.flags &= ~WRITEABLE(1);
- return-PAL_ERROR_TRYAGAIN;
- case EINTR:
- return -PAL_ERROR_INTERRUPTED;
- default:
- return -PAL_ERROR_DENIED;
- }
- if (bytes == count)
- handle->__in.flags |= WRITEABLE(1);
- else
- handle->__in.flags &= ~WRITEABLE(1);
- return bytes;
- }
- static int proc_close (PAL_HANDLE handle)
- {
- if (handle->process.stream_in != PAL_IDX_POISON) {
- INLINE_SYSCALL(close, 1, handle->process.stream_in);
- handle->process.stream_in = PAL_IDX_POISON;
- }
- if (handle->process.stream_out != PAL_IDX_POISON) {
- INLINE_SYSCALL(close, 1, handle->process.stream_out);
- handle->process.stream_out = PAL_IDX_POISON;
- }
- if (handle->process.cargo != PAL_IDX_POISON) {
- INLINE_SYSCALL(close, 1, handle->process.cargo);
- handle->process.cargo = PAL_IDX_POISON;
- }
- return 0;
- }
- static int proc_delete (PAL_HANDLE handle, int access)
- {
- int shutdown;
- switch (access) {
- case 0:
- shutdown = SHUT_RDWR;
- break;
- case PAL_DELETE_RD:
- shutdown = SHUT_RD;
- break;
- case PAL_DELETE_WR:
- shutdown = SHUT_WR;
- break;
- default:
- return -PAL_ERROR_INVAL;
- }
- if (access != PAL_DELETE_WR &&
- handle->process.stream_in != PAL_IDX_POISON) {
- INLINE_SYSCALL(close, 1, handle->process.stream_in);
- handle->process.stream_in = PAL_IDX_POISON;
- }
- if (access != PAL_DELETE_RD &&
- handle->process.stream_out != PAL_IDX_POISON) {
- INLINE_SYSCALL(close, 1, handle->process.stream_out);
- handle->process.stream_out = PAL_IDX_POISON;
- }
- if (handle->process.cargo != PAL_IDX_POISON)
- INLINE_SYSCALL(shutdown, 2, handle->process.cargo, shutdown);
- return 0;
- }
- #ifndef FIONREAD
- # define FIONREAD 0x541B
- #endif
- static int proc_attrquerybyhdl (PAL_HANDLE handle, PAL_STREAM_ATTR * attr)
- {
- int ret, val;
- if (handle->process.stream_in == PAL_IDX_POISON)
- return -PAL_ERROR_BADHANDLE;
- memset(attr, 0, sizeof(PAL_STREAM_ATTR));
- ret = INLINE_SYSCALL(ioctl, 3, handle->process.stream_in, FIONREAD, &val);
- if (!IS_ERR(ret))
- attr->size = val;
- attr->disconnected = handle->__in.flags & (ERROR(0)|ERROR(1));
- attr->readable = (attr->size > 0);
- attr->writeable = handle->__in.flags & WRITEABLE(1);
- attr->nonblocking = handle->process.nonblocking;
- return 0;
- }
- static int proc_attrsetbyhdl (PAL_HANDLE handle, PAL_STREAM_ATTR * attr)
- {
- if (handle->process.stream_in == PAL_IDX_POISON)
- return -PAL_ERROR_BADHANDLE;
- int ret;
- if (attr->nonblocking != handle->process.nonblocking) {
- ret = INLINE_SYSCALL(fcntl, 3, handle->process.stream_in, F_SETFL,
- handle->process.nonblocking ? O_NONBLOCK : 0);
- if (IS_ERR(ret))
- return unix_to_pal_error(ERRNO(ret));
- handle->process.nonblocking = attr->nonblocking;
- }
- return 0;
- }
- struct handle_ops proc_ops = {
- .read = &proc_read,
- .write = &proc_write,
- .close = &proc_close,
- .delete = &proc_delete,
- .attrquerybyhdl = &proc_attrquerybyhdl,
- .attrsetbyhdl = &proc_attrsetbyhdl,
- };
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