X-Git-Url: https://git.lttng.org/?p=lttng-tools.git;a=blobdiff_plain;f=src%2Fcommon%2Frunas.c;h=930c973ff956ec2c13aeed57d2d2d69b8995775f;hp=debc95926e7d04fa7989ca8f62bc2b85e0e8aaf6;hb=HEAD;hpb=f726677b9b3a5a384bb96ea4ef7d6f0c4b03524f

diff --git a/src/common/runas.c b/src/common/runas.c
deleted file mode 100644
index debc95926..000000000
--- a/src/common/runas.c
+++ /dev/null
@@ -1,1221 +0,0 @@
-/*
- * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
- *                      Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License, version 2 only,
- * 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.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; if not, write to the Free Software Foundation, Inc.,
- * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
- */
-
-#define _LGPL_SOURCE
-#include <errno.h>
-#include <limits.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <sys/wait.h>
-#include <sys/types.h>
-#include <sys/stat.h>
-#include <unistd.h>
-#include <fcntl.h>
-#include <sched.h>
-#include <signal.h>
-#include <assert.h>
-#include <signal.h>
-
-#include <common/lttng-kernel.h>
-#include <common/common.h>
-#include <common/utils.h>
-#include <common/compat/getenv.h>
-#include <common/compat/prctl.h>
-#include <common/unix.h>
-#include <common/defaults.h>
-#include <common/lttng-elf.h>
-
-#include <lttng/constant.h>
-
-#include "runas.h"
-
-struct run_as_data;
-struct run_as_ret;
-typedef int (*run_as_fct)(struct run_as_data *data, struct run_as_ret *ret_value);
-
-struct run_as_mkdir_data {
-	char path[PATH_MAX];
-	mode_t mode;
-};
-
-struct run_as_open_data {
-	char path[PATH_MAX];
-	int flags;
-	mode_t mode;
-};
-
-struct run_as_unlink_data {
-	char path[PATH_MAX];
-};
-
-struct run_as_rmdir_recursive_data {
-	char path[PATH_MAX];
-};
-
-struct run_as_extract_elf_symbol_offset_data {
-	char function[LTTNG_SYMBOL_NAME_LEN];
-};
-
-struct run_as_extract_sdt_probe_offsets_data {
-	char probe_name[LTTNG_SYMBOL_NAME_LEN];
-	char provider_name[LTTNG_SYMBOL_NAME_LEN];
-};
-
-struct run_as_mkdir_ret {
-	int ret;
-};
-
-struct run_as_open_ret {
-	int ret;
-};
-
-struct run_as_unlink_ret {
-	int ret;
-};
-
-struct run_as_rmdir_recursive_ret {
-	int ret;
-};
-
-struct run_as_extract_elf_symbol_offset_ret {
-	uint64_t offset;
-};
-
-struct run_as_extract_sdt_probe_offsets_ret {
-	uint32_t num_offset;
-	uint64_t offsets[LTTNG_KERNEL_MAX_UPROBE_NUM];
-};
-
-enum run_as_cmd {
-	RUN_AS_MKDIR,
-	RUN_AS_OPEN,
-	RUN_AS_UNLINK,
-	RUN_AS_RMDIR_RECURSIVE,
-	RUN_AS_MKDIR_RECURSIVE,
-	RUN_AS_EXTRACT_ELF_SYMBOL_OFFSET,
-	RUN_AS_EXTRACT_SDT_PROBE_OFFSETS,
-};
-
-struct run_as_data {
-	enum run_as_cmd cmd;
-	int fd;
-	union {
-		struct run_as_mkdir_data mkdir;
-		struct run_as_open_data open;
-		struct run_as_unlink_data unlink;
-		struct run_as_rmdir_recursive_data rmdir_recursive;
-		struct run_as_extract_elf_symbol_offset_data extract_elf_symbol_offset;
-		struct run_as_extract_sdt_probe_offsets_data extract_sdt_probe_offsets;
-	} u;
-	uid_t uid;
-	gid_t gid;
-};
-
-/*
- * The run_as_ret structure holds the returned value and status of the command.
- *
- * The `u` union field holds the return value of the command; in most cases it
- * represents the success or the failure of the command. In more complex
- * commands, it holds a computed value.
- *
- * The _errno field is the errno recorded after the execution of the command.
- *
- * The _error fields is used the signify that return status of the command. For
- * simple commands returning `int` the _error field will be the same as the
- * ret_int field. In complex commands, it signify the success or failure of the
- * command.
- *
- */
-struct run_as_ret {
-	int fd;
-	union {
-		struct run_as_mkdir_ret mkdir;
-		struct run_as_open_ret open;
-		struct run_as_unlink_ret unlink;
-		struct run_as_rmdir_recursive_ret rmdir_recursive;
-		struct run_as_extract_elf_symbol_offset_ret extract_elf_symbol_offset;
-		struct run_as_extract_sdt_probe_offsets_ret extract_sdt_probe_offsets;
-	} u;
-	int _errno;
-	bool _error;
-};
-
-struct run_as_worker {
-	pid_t pid;	/* Worker PID. */
-	int sockpair[2];
-	char *procname;
-};
-
-/* Single global worker per process (for now). */
-static struct run_as_worker *global_worker;
-/* Lock protecting the worker. */
-static pthread_mutex_t worker_lock = PTHREAD_MUTEX_INITIALIZER;
-
-#ifdef VALGRIND
-static
-int use_clone(void)
-{
-	return 0;
-}
-#else
-static
-int use_clone(void)
-{
-	return !lttng_secure_getenv("LTTNG_DEBUG_NOCLONE");
-}
-#endif
-
-LTTNG_HIDDEN
-int _utils_mkdir_recursive_unsafe(const char *path, mode_t mode);
-
-/*
- * Create recursively directory using the FULL path.
- */
-static
-int _mkdir_recursive(struct run_as_data *data, struct run_as_ret *ret_value)
-{
-	const char *path;
-	mode_t mode;
-
-	path = data->u.mkdir.path;
-	mode = data->u.mkdir.mode;
-
-	/* Safe to call as we have transitioned to the requested uid/gid. */
-	ret_value->u.mkdir.ret = _utils_mkdir_recursive_unsafe(path, mode);
-	ret_value->_errno = errno;
-	ret_value->_error = (ret_value->u.mkdir.ret) ? true : false;
-	return ret_value->u.mkdir.ret;
-}
-
-static
-int _mkdir(struct run_as_data *data, struct run_as_ret *ret_value)
-{
-	ret_value->u.mkdir.ret = mkdir(data->u.mkdir.path, data->u.mkdir.mode);
-	ret_value->_errno = errno;
-	ret_value->_error = (ret_value->u.mkdir.ret) ? true : false;
-	return ret_value->u.mkdir.ret;
-}
-
-static
-int _open(struct run_as_data *data, struct run_as_ret *ret_value)
-{
-	ret_value->u.open.ret = open(data->u.open.path, data->u.open.flags, data->u.open.mode);
-	ret_value->fd = ret_value->u.open.ret;
-	ret_value->_errno = errno;
-	ret_value->_error = (ret_value->u.open.ret) ? true : false;
-	return ret_value->u.open.ret;
-}
-
-static
-int _unlink(struct run_as_data *data, struct run_as_ret *ret_value)
-{
-	ret_value->u.unlink.ret = unlink(data->u.unlink.path);
-	ret_value->_errno = errno;
-	ret_value->_error = (ret_value->u.unlink.ret) ? true : false;
-	return ret_value->u.unlink.ret;
-}
-
-static
-int _rmdir_recursive(struct run_as_data *data, struct run_as_ret *ret_value)
-{
-	ret_value->u.rmdir_recursive.ret = utils_recursive_rmdir(data->u.rmdir_recursive.path);
-	ret_value->_errno = errno;
-	ret_value->_error = (ret_value->u.rmdir_recursive.ret) ? true : false;
-	return ret_value->u.rmdir_recursive.ret;
-}
-
-static
-int _extract_elf_symbol_offset(struct run_as_data *data,
-		struct run_as_ret *ret_value)
-{
-	int ret = 0;
-	ret_value->_error = false;
-
-	ret = lttng_elf_get_symbol_offset(data->fd,
-			 data->u.extract_elf_symbol_offset.function,
-			 &ret_value->u.extract_elf_symbol_offset.offset);
-	if (ret) {
-		DBG("Failed to extract ELF function offset");
-		ret_value->_error = true;
-	}
-
-	return ret;
-}
-
-static
-int _extract_sdt_probe_offsets(struct run_as_data *data,
-		struct run_as_ret *ret_value)
-{
-	int ret = 0;
-	uint64_t *offsets = NULL;
-	uint32_t num_offset;
-
-	ret_value->_error = false;
-
-	/* On success, this call allocates the offsets paramater. */
-	ret = lttng_elf_get_sdt_probe_offsets(data->fd,
-			data->u.extract_sdt_probe_offsets.provider_name,
-			data->u.extract_sdt_probe_offsets.probe_name,
-			&offsets, &num_offset);
-
-	if (ret) {
-		DBG("Failed to extract SDT probe offsets");
-		ret_value->_error = true;
-		goto end;
-	}
-
-	if (num_offset <= 0 || num_offset > LTTNG_KERNEL_MAX_UPROBE_NUM) {
-		DBG("Wrong number of probes.");
-		ret = -1;
-		ret_value->_error = true;
-		goto free_offset;
-	}
-
-	/* Copy the content of the offsets array to the ret struct. */
-	memcpy(ret_value->u.extract_sdt_probe_offsets.offsets,
-			offsets, num_offset * sizeof(uint64_t));
-
-	ret_value->u.extract_sdt_probe_offsets.num_offset = num_offset;
-
-free_offset:
-	free(offsets);
-end:
-	return ret;
-}
-
-static
-run_as_fct run_as_enum_to_fct(enum run_as_cmd cmd)
-{
-	switch (cmd) {
-	case RUN_AS_MKDIR:
-		return _mkdir;
-	case RUN_AS_OPEN:
-		return _open;
-	case RUN_AS_UNLINK:
-		return _unlink;
-	case RUN_AS_RMDIR_RECURSIVE:
-		return _rmdir_recursive;
-	case RUN_AS_MKDIR_RECURSIVE:
-		return _mkdir_recursive;
-	case RUN_AS_EXTRACT_ELF_SYMBOL_OFFSET:
-		return _extract_elf_symbol_offset;
-	case RUN_AS_EXTRACT_SDT_PROBE_OFFSETS:
-		return _extract_sdt_probe_offsets;
-	default:
-		ERR("Unknown command %d", (int) cmd);
-		return NULL;
-	}
-}
-
-static
-int do_send_fd(int sock, int fd)
-{
-	ssize_t len;
-
-	if (fd < 0) {
-		ERR("Invalid file description");
-		return 0;
-	}
-
-	len = lttcomm_send_fds_unix_sock(sock, &fd, 1);
-	if (len < 0) {
-		PERROR("lttcomm_send_fds_unix_sock");
-		return -1;
-	}
-	return 0;
-}
-
-static
-int do_recv_fd(int sock, int *fd)
-{
-	ssize_t len;
-
-	if (*fd < 0) {
-		ERR("Invalid file description");
-		return 0;
-	}
-
-	len = lttcomm_recv_fds_unix_sock(sock, fd, 1);
-
-	if (!len) {
-		return -1;
-	} else if (len < 0) {
-		PERROR("lttcomm_recv_fds_unix_sock");
-		return -1;
-	}
-	return 0;
-}
-
-static
-int send_fd_to_worker(struct run_as_worker *worker, enum run_as_cmd cmd, int fd)
-{
-	int ret = 0;
-
-	switch (cmd) {
-	case RUN_AS_EXTRACT_ELF_SYMBOL_OFFSET:
-	case RUN_AS_EXTRACT_SDT_PROBE_OFFSETS:
-		break;
-	default:
-		return 0;
-	}
-
-	ret = do_send_fd(worker->sockpair[0], fd);
-	if (ret < 0) {
-		PERROR("do_send_fd");
-		ret = -1;
-	}
-
-	return ret;
-}
-
-static
-int send_fd_to_master(struct run_as_worker *worker, enum run_as_cmd cmd, int fd)
-{
-	int ret = 0, ret_close = 0;
-
-	switch (cmd) {
-	case RUN_AS_OPEN:
-		break;
-	default:
-		return 0;
-	}
-
-	ret = do_send_fd(worker->sockpair[1], fd);
-	if (ret < 0) {
-		PERROR("do_send_fd error");
-		ret = -1;
-	}
-
-	ret_close = close(fd);
-	if (ret_close < 0) {
-		PERROR("close");
-	}
-
-	return ret;
-}
-
-static
-int recv_fd_from_worker(struct run_as_worker *worker, enum run_as_cmd cmd, int *fd)
-{
-	int ret = 0;
-
-	switch (cmd) {
-	case RUN_AS_OPEN:
-		break;
-	default:
-		return 0;
-	}
-
-	ret = do_recv_fd(worker->sockpair[0], fd);
-	if (ret < 0) {
-		PERROR("do_recv_fd error");
-		ret = -1;
-	}
-
-	return ret;
-}
-
-static
-int recv_fd_from_master(struct run_as_worker *worker, enum run_as_cmd cmd, int *fd)
-{
-	int ret = 0;
-
-	switch (cmd) {
-	case RUN_AS_EXTRACT_ELF_SYMBOL_OFFSET:
-	case RUN_AS_EXTRACT_SDT_PROBE_OFFSETS:
-		break;
-	default:
-		return 0;
-	}
-
-	ret = do_recv_fd(worker->sockpair[1], fd);
-	if (ret < 0) {
-		PERROR("do_recv_fd error");
-		ret = -1;
-	}
-
-	return ret;
-}
-
-static
-int cleanup_received_fd(enum run_as_cmd cmd, int fd)
-{
-	int ret = 0;
-
-	switch (cmd) {
-	case RUN_AS_EXTRACT_ELF_SYMBOL_OFFSET:
-	case RUN_AS_EXTRACT_SDT_PROBE_OFFSETS:
-		break;
-	default:
-		return 0;
-	}
-
-	ret = close(fd);
-	if (ret < 0) {
-		PERROR("close error");
-		ret = -1;
-	}
-
-	return ret;
-}
-
-/*
- * Return < 0 on error, 0 if OK, 1 on hangup.
- */
-static
-int handle_one_cmd(struct run_as_worker *worker)
-{
-	int ret = 0;
-	struct run_as_data data;
-	ssize_t readlen, writelen;
-	struct run_as_ret sendret;
-	run_as_fct cmd;
-	uid_t prev_euid;
-
-	memset(&sendret, 0, sizeof(sendret));
-	sendret.fd = -1;
-
-	/*
-	 * Stage 1: Receive run_as_data struct from the master.
-	 * The structure contains the command type and all the parameters needed for
-	 * its execution
-	 */
-	readlen = lttcomm_recv_unix_sock(worker->sockpair[1], &data,
-			sizeof(data));
-	if (readlen == 0) {
-		/* hang up */
-		ret = 1;
-		goto end;
-	}
-	if (readlen < sizeof(data)) {
-		PERROR("lttcomm_recv_unix_sock error");
-		ret = -1;
-		goto end;
-	}
-
-	cmd = run_as_enum_to_fct(data.cmd);
-	if (!cmd) {
-		ret = -1;
-		goto end;
-	}
-
-	/*
-	 * Stage 2: Receive file descriptor from master.
-	 * Some commands need a file descriptor as input so if it's needed we
-	 * receive the fd using the Unix socket.
-	 */
-	ret = recv_fd_from_master(worker, data.cmd, &data.fd);
-	if (ret < 0) {
-		PERROR("recv_fd_from_master error");
-		ret = -1;
-		goto end;
-	}
-
-	prev_euid = getuid();
-	if (data.gid != getegid()) {
-		ret = setegid(data.gid);
-		if (ret < 0) {
-			sendret._error = true;
-			sendret._errno = errno;
-			PERROR("setegid");
-			goto write_return;
-		}
-	}
-	if (data.uid != prev_euid) {
-		ret = seteuid(data.uid);
-		if (ret < 0) {
-			sendret._error = true;
-			sendret._errno = errno;
-			PERROR("seteuid");
-			goto write_return;
-		}
-	}
-
-	/*
-	 * Also set umask to 0 for mkdir executable bit.
-	 */
-	umask(0);
-
-	/*
-	 * Stage 3: Execute the command
-	 */
-	ret = (*cmd)(&data, &sendret);
-	if (ret < 0) {
-		DBG("Execution of command returned an error");
-	}
-
-write_return:
-	ret = cleanup_received_fd(data.cmd, data.fd);
-	if (ret < 0) {
-		ERR("Error cleaning up FD");
-		goto end;
-	}
-
-	/*
-	 * Stage 4: Send run_as_ret structure to the master.
-	 * This structure contain the return value of the command and the errno.
-	 */
-	writelen = lttcomm_send_unix_sock(worker->sockpair[1], &sendret,
-			sizeof(sendret));
-	if (writelen < sizeof(sendret)) {
-		PERROR("lttcomm_send_unix_sock error");
-		ret = -1;
-		goto end;
-	}
-
-	/*
-	 * Stage 5: Send file descriptor to the master
-	 * Some commands return a file descriptor so if it's needed we pass it back
-	 * to the master using the Unix socket.
-	 */
-	ret = send_fd_to_master(worker, data.cmd, sendret.fd);
-	if (ret < 0) {
-		DBG("Sending FD to master returned an error");
-		goto end;
-	}
-
-	if (seteuid(prev_euid) < 0) {
-		PERROR("seteuid");
-		ret = -1;
-		goto end;
-	}
-	ret = 0;
-end:
-	return ret;
-}
-
-static
-int run_as_worker(struct run_as_worker *worker)
-{
-	int ret;
-	ssize_t writelen;
-	struct run_as_ret sendret;
-	size_t proc_orig_len;
-
-	/*
-	 * Initialize worker. Set a different process cmdline.
-	 */
-	proc_orig_len = strlen(worker->procname);
-	memset(worker->procname, 0, proc_orig_len);
-	strncpy(worker->procname, DEFAULT_RUN_AS_WORKER_NAME, proc_orig_len);
-
-	ret = lttng_prctl(PR_SET_NAME,
-			(unsigned long) DEFAULT_RUN_AS_WORKER_NAME, 0, 0, 0);
-	if (ret && ret != -ENOSYS) {
-		/* Don't fail as this is not essential. */
-		PERROR("prctl PR_SET_NAME");
-	}
-
-	memset(&sendret, 0, sizeof(sendret));
-
-	writelen = lttcomm_send_unix_sock(worker->sockpair[1], &sendret,
-			sizeof(sendret));
-	if (writelen < sizeof(sendret)) {
-		PERROR("lttcomm_send_unix_sock error");
-		ret = EXIT_FAILURE;
-		goto end;
-	}
-
-	for (;;) {
-		ret = handle_one_cmd(worker);
-		if (ret < 0) {
-			ret = EXIT_FAILURE;
-			goto end;
-		} else if (ret > 0) {
-			break;
-		} else {
-			continue;	/* Next command. */
-		}
-	}
-	ret = EXIT_SUCCESS;
-end:
-	return ret;
-}
-
-static
-int run_as_cmd(struct run_as_worker *worker,
-		enum run_as_cmd cmd,
-		struct run_as_data *data,
-		struct run_as_ret *ret_value,
-		uid_t uid, gid_t gid)
-{
-	int ret = 0;
-	ssize_t readlen, writelen;
-
-	/*
-	 * If we are non-root, we can only deal with our own uid.
-	 */
-	if (geteuid() != 0) {
-		if (uid != geteuid()) {
-			ret = -1;
-			ret_value->_errno = EPERM;
-			ERR("Client (%d)/Server (%d) UID mismatch (and sessiond is not root)",
-				(int) uid, (int) geteuid());
-			goto end;
-		}
-	}
-
-	data->cmd = cmd;
-	data->uid = uid;
-	data->gid = gid;
-
-	/*
-	 * Stage 1: Send the run_as_data struct to the worker process
-	 */
-	writelen = lttcomm_send_unix_sock(worker->sockpair[0], data,
-			sizeof(*data));
-	if (writelen < sizeof(*data)) {
-		PERROR("Error writing message to run_as");
-		ret = -1;
-		ret_value->_errno = EIO;
-		goto end;
-	}
-
-	/*
-	 * Stage 2: Send file descriptor to the worker process if needed
-	 */
-	ret = send_fd_to_worker(worker, data->cmd, data->fd);
-	if (ret) {
-		PERROR("do_send_fd error");
-		ret = -1;
-		ret_value->_errno = EIO;
-		goto end;
-	}
-
-	/*
-	 * Stage 3: Wait for the execution of the command
-	 */
-
-	/*
-	 * Stage 4: Receive the run_as_ret struct containing the return value and
-	 * errno
-	 */
-	readlen = lttcomm_recv_unix_sock(worker->sockpair[0], ret_value,
-			sizeof(*ret_value));
-	if (!readlen) {
-		ERR("Run-as worker has hung-up during run_as_cmd");
-		ret = -1;
-		ret_value->_errno = EIO;
-		goto end;
-	} else if (readlen < sizeof(*ret_value)) {
-		PERROR("Error reading response from run_as");
-		ret = -1;
-		ret_value->_errno = errno;
-		goto end;
-	}
-
-	/*
-	 * Stage 5: Receive file descriptor if needed
-	 */
-	ret = recv_fd_from_worker(worker, data->cmd, &ret_value->fd);
-	if (ret < 0) {
-		ERR("Error receiving fd");
-		ret = -1;
-		ret_value->_errno = EIO;
-	}
-
-end:
-	return ret;
-}
-
-/*
- * This is for debugging ONLY and should not be considered secure.
- */
-static
-int run_as_noworker(enum run_as_cmd cmd,
-		struct run_as_data *data, struct run_as_ret *ret_value,
-		uid_t uid, gid_t gid)
-{
-	int ret, saved_errno;
-	mode_t old_mask;
-	run_as_fct fct;
-
-	fct = run_as_enum_to_fct(cmd);
-	if (!fct) {
-		errno = -ENOSYS;
-		ret = -1;
-		goto end;
-	}
-	old_mask = umask(0);
-	ret = fct(data, ret_value);
-	saved_errno = ret_value->_errno;
-	umask(old_mask);
-	errno = saved_errno;
-end:
-	return ret;
-}
-
-static
-int run_as_restart_worker(struct run_as_worker *worker)
-{
-	int ret = 0;
-	char *procname = NULL;
-
-	procname = worker->procname;
-
-	/* Close socket to run_as worker process and clean up the zombie process */
-	run_as_destroy_worker();
-
-	/* Create a new run_as worker process*/
-	ret = run_as_create_worker(procname);
-	if (ret < 0 ) {
-		ERR("Restarting the worker process failed");
-		ret = -1;
-		goto err;
-	}
-err:
-	return ret;
-}
-
-static
-int run_as(enum run_as_cmd cmd, struct run_as_data *data,
-		   struct run_as_ret *ret_value, uid_t uid, gid_t gid)
-{
-	int ret, saved_errno;
-
-	if (use_clone()) {
-		DBG("Using run_as worker");
-		pthread_mutex_lock(&worker_lock);
-		assert(global_worker);
-
-		ret = run_as_cmd(global_worker, cmd, data, ret_value, uid, gid);
-		saved_errno = ret_value->_errno;
-
-		pthread_mutex_unlock(&worker_lock);
-		/*
-		 * If the worker thread crashed the errno is set to EIO. we log
-		 * the error and  start a new worker process.
-		 */
-		if (ret == -1 && saved_errno == EIO) {
-			DBG("Socket closed unexpectedly... "
-					"Restarting the worker process");
-			ret = run_as_restart_worker(global_worker);
-
-			if (ret == -1) {
-				ERR("Failed to restart worker process.");
-				goto err;
-			}
-		}
-	} else {
-		DBG("Using run_as without worker");
-		ret = run_as_noworker(cmd, data, ret_value, uid, gid);
-	}
-err:
-	return ret;
-}
-
-LTTNG_HIDDEN
-int run_as_mkdir_recursive(const char *path, mode_t mode, uid_t uid, gid_t gid)
-{
-	struct run_as_data data;
-	struct run_as_ret ret;
-
-	memset(&data, 0, sizeof(data));
-	memset(&ret, 0, sizeof(ret));
-	DBG3("mkdir() recursive %s with mode %d for uid %d and gid %d",
-			path, (int) mode, (int) uid, (int) gid);
-	strncpy(data.u.mkdir.path, path, PATH_MAX - 1);
-	data.u.mkdir.path[PATH_MAX - 1] = '\0';
-	data.u.mkdir.mode = mode;
-
-	run_as(RUN_AS_MKDIR_RECURSIVE, &data, &ret, uid, gid);
-	errno = ret._errno;
-	return ret.u.mkdir.ret;
-}
-
-LTTNG_HIDDEN
-int run_as_mkdir(const char *path, mode_t mode, uid_t uid, gid_t gid)
-{
-	struct run_as_data data;
-	struct run_as_ret ret;
-
-	memset(&data, 0, sizeof(data));
-	memset(&ret, 0, sizeof(ret));
-
-	DBG3("mkdir() %s with mode %d for uid %d and gid %d",
-			path, (int) mode, (int) uid, (int) gid);
-	strncpy(data.u.mkdir.path, path, PATH_MAX - 1);
-	data.u.mkdir.path[PATH_MAX - 1] = '\0';
-	data.u.mkdir.mode = mode;
-	run_as(RUN_AS_MKDIR, &data, &ret, uid, gid);
-	errno = ret._errno;
-	return ret.u.mkdir.ret;
-}
-
-LTTNG_HIDDEN
-int run_as_open(const char *path, int flags, mode_t mode, uid_t uid, gid_t gid)
-{
-	struct run_as_data data;
-	struct run_as_ret ret;
-
-	memset(&data, 0, sizeof(data));
-	memset(&ret, 0, sizeof(ret));
-
-	DBG3("open() %s with flags %X mode %d for uid %d and gid %d",
-			path, flags, (int) mode, (int) uid, (int) gid);
-	strncpy(data.u.open.path, path, PATH_MAX - 1);
-	data.u.open.path[PATH_MAX - 1] = '\0';
-	data.u.open.flags = flags;
-	data.u.open.mode = mode;
-	run_as(RUN_AS_OPEN, &data, &ret, uid, gid);
-	errno = ret._errno;
-	ret.u.open.ret = ret.fd;
-	return ret.u.open.ret;
-}
-
-LTTNG_HIDDEN
-int run_as_unlink(const char *path, uid_t uid, gid_t gid)
-{
-	struct run_as_data data;
-	struct run_as_ret ret;
-
-	memset(&data, 0, sizeof(data));
-	memset(&ret, 0, sizeof(ret));
-
-	DBG3("unlink() %s with for uid %d and gid %d",
-			path, (int) uid, (int) gid);
-	strncpy(data.u.unlink.path, path, PATH_MAX - 1);
-	data.u.unlink.path[PATH_MAX - 1] = '\0';
-	run_as(RUN_AS_UNLINK, &data, &ret, uid, gid);
-	errno = ret._errno;
-	return ret.u.unlink.ret;
-}
-
-LTTNG_HIDDEN
-int run_as_rmdir_recursive(const char *path, uid_t uid, gid_t gid)
-{
-	struct run_as_data data;
-	struct run_as_ret ret;
-
-	memset(&data, 0, sizeof(data));
-	memset(&ret, 0, sizeof(ret));
-
-	DBG3("rmdir_recursive() %s with for uid %d and gid %d",
-			path, (int) uid, (int) gid);
-	strncpy(data.u.rmdir_recursive.path, path, PATH_MAX - 1);
-	data.u.rmdir_recursive.path[PATH_MAX - 1] = '\0';
-	run_as(RUN_AS_RMDIR_RECURSIVE, &data, &ret, uid, gid);
-	errno = ret._errno;
-	return ret.u.rmdir_recursive.ret;
-}
-
-LTTNG_HIDDEN
-int run_as_extract_elf_symbol_offset(int fd, const char* function,
-		uid_t uid, gid_t gid, uint64_t *offset)
-{
-	struct run_as_data data;
-	struct run_as_ret ret;
-
-	memset(&data, 0, sizeof(data));
-	memset(&ret, 0, sizeof(ret));
-
-	DBG3("extract_elf_symbol_offset() on fd=%d and function=%s "
-		"with for uid %d and gid %d", fd, function, (int) uid, (int) gid);
-
-	data.fd = fd;
-
-	strncpy(data.u.extract_elf_symbol_offset.function, function, LTTNG_SYMBOL_NAME_LEN - 1);
-
-	data.u.extract_elf_symbol_offset.function[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
-
-	run_as(RUN_AS_EXTRACT_ELF_SYMBOL_OFFSET, &data, &ret, uid, gid);
-
-	errno = ret._errno;
-
-	if (ret._error) {
-		return -1;
-	}
-
-	*offset = ret.u.extract_elf_symbol_offset.offset;
-	return 0;
-}
-
-LTTNG_HIDDEN
-int run_as_extract_sdt_probe_offsets(int fd, const char* provider_name,
-		const char* probe_name, uid_t uid, gid_t gid,
-		uint64_t **offsets, uint32_t *num_offset)
-{
-	struct run_as_data data;
-	struct run_as_ret ret;
-
-	memset(&data, 0, sizeof(data));
-	memset(&ret, 0, sizeof(ret));
-
-	DBG3("extract_sdt_probe_offsets() on fd=%d, probe_name=%s and "
-		"provider_name=%s with for uid %d and gid %d", fd, probe_name,
-		provider_name, (int) uid, (int) gid);
-
-	data.fd = fd;
-
-	strncpy(data.u.extract_sdt_probe_offsets.probe_name, probe_name, LTTNG_SYMBOL_NAME_LEN - 1);
-	strncpy(data.u.extract_sdt_probe_offsets.provider_name, provider_name, LTTNG_SYMBOL_NAME_LEN - 1);
-
-	data.u.extract_sdt_probe_offsets.probe_name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
-	data.u.extract_sdt_probe_offsets.provider_name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
-
-	run_as(RUN_AS_EXTRACT_SDT_PROBE_OFFSETS, &data, &ret, uid, gid);
-
-	errno = ret._errno;
-
-	if (ret._error) {
-		return -1;
-	}
-
-	*num_offset = ret.u.extract_sdt_probe_offsets.num_offset;
-
-	*offsets = zmalloc(*num_offset * sizeof(uint64_t));
-	if (!*offsets) {
-		return -ENOMEM;
-	}
-
-	memcpy(*offsets, ret.u.extract_sdt_probe_offsets.offsets, *num_offset * sizeof(uint64_t));
-	return 0;
-}
-
-static
-int reset_sighandler(void)
-{
-	int sig;
-
-	DBG("Resetting run_as worker signal handlers to default");
-	for (sig = 1; sig <= 31; sig++) {
-		(void) signal(sig, SIG_DFL);
-	}
-	return 0;
-}
-
-static
-void worker_sighandler(int sig)
-{
-	const char *signame;
-
-	/*
-	 * The worker will inherit its parent's signals since they are part of
-	 * the same process group. However, in the case of SIGINT and SIGTERM,
-	 * we want to give the worker a chance to teardown gracefully when its
-	 * parent closes the command socket.
-	 */
-	switch (sig) {
-	case SIGINT:
-		signame = "SIGINT";
-		break;
-	case SIGTERM:
-		signame = "SIGTERM";
-		break;
-	default:
-		signame = NULL;
-	}
-
-	if (signame) {
-		DBG("run_as worker received signal %s", signame);
-	} else {
-		DBG("run_as_worker received signal %d", sig);
-	}
-}
-
-static
-int set_worker_sighandlers(void)
-{
-	int ret = 0;
-	sigset_t sigset;
-	struct sigaction sa;
-
-	if ((ret = sigemptyset(&sigset)) < 0) {
-		PERROR("sigemptyset");
-		goto end;
-	}
-
-	sa.sa_handler = worker_sighandler;
-	sa.sa_mask = sigset;
-	sa.sa_flags = 0;
-	if ((ret = sigaction(SIGINT, &sa, NULL)) < 0) {
-		PERROR("sigaction SIGINT");
-		goto end;
-	}
-
-	if ((ret = sigaction(SIGTERM, &sa, NULL)) < 0) {
-		PERROR("sigaction SIGTERM");
-		goto end;
-	}
-
-	DBG("run_as signal handler set for SIGTERM and SIGINT");
-end:
-	return ret;
-}
-
-LTTNG_HIDDEN
-int run_as_create_worker(char *procname)
-{
-	pid_t pid;
-	int i, ret = 0;
-	ssize_t readlen;
-	struct run_as_ret recvret;
-	struct run_as_worker *worker;
-
-	pthread_mutex_lock(&worker_lock);
-	assert(!global_worker);
-	if (!use_clone()) {
-		/*
-		 * Don't initialize a worker, all run_as tasks will be performed
-		 * in the current process.
-		 */
-		ret = 0;
-		goto end;
-	}
-	worker = zmalloc(sizeof(*worker));
-	if (!worker) {
-		ret = -ENOMEM;
-		goto end;
-	}
-	worker->procname = procname;
-	/* Create unix socket. */
-	if (lttcomm_create_anon_unix_socketpair(worker->sockpair) < 0) {
-		ret = -1;
-		goto error_sock;
-	}
-
-	/* Fork worker. */
-	pid = fork();
-	if (pid < 0) {
-		PERROR("fork");
-		ret = -1;
-		goto error_fork;
-	} else if (pid == 0) {
-		/* Child */
-
-		reset_sighandler();
-
-		set_worker_sighandlers();
-
-		/* The child has no use for this lock. */
-		pthread_mutex_unlock(&worker_lock);
-		/* Just close, no shutdown. */
-		if (close(worker->sockpair[0])) {
-			PERROR("close");
-			exit(EXIT_FAILURE);
-		}
-
-		/*
-		 * Close all FDs aside from STDIN, STDOUT, STDERR and sockpair[1]
-		 * Sockpair[1] is used as a control channel with the master
-		 */
-		for (i = 3; i < sysconf(_SC_OPEN_MAX); i++) {
-			if (i != worker->sockpair[1]) {
-				(void) close(i);
-			}
-		}
-
-		worker->sockpair[0] = -1;
-		ret = run_as_worker(worker);
-		if (lttcomm_close_unix_sock(worker->sockpair[1])) {
-			PERROR("close");
-			ret = -1;
-		}
-		worker->sockpair[1] = -1;
-		LOG(ret ? PRINT_ERR : PRINT_DBG, "run_as worker exiting (ret = %d)", ret);
-		exit(ret ? EXIT_FAILURE : EXIT_SUCCESS);
-	} else {
-		/* Parent */
-
-		/* Just close, no shutdown. */
-		if (close(worker->sockpair[1])) {
-			PERROR("close");
-			ret = -1;
-			goto error_fork;
-		}
-		worker->sockpair[1] = -1;
-		worker->pid = pid;
-		/* Wait for worker to become ready. */
-		readlen = lttcomm_recv_unix_sock(worker->sockpair[0],
-				&recvret, sizeof(recvret));
-		if (readlen < sizeof(recvret)) {
-			ERR("readlen: %zd", readlen);
-			PERROR("Error reading response from run_as at creation");
-			ret = -1;
-			goto error_fork;
-		}
-		global_worker = worker;
-	}
-end:
-	pthread_mutex_unlock(&worker_lock);
-	return ret;
-
-	/* Error handling. */
-error_fork:
-	for (i = 0; i < 2; i++) {
-		if (worker->sockpair[i] < 0) {
-			continue;
-		}
-		if (lttcomm_close_unix_sock(worker->sockpair[i])) {
-			PERROR("close");
-		}
-		worker->sockpair[i] = -1;
-	}
-error_sock:
-	free(worker);
-	pthread_mutex_unlock(&worker_lock);
-	return ret;
-}
-
-LTTNG_HIDDEN
-void run_as_destroy_worker(void)
-{
-	struct run_as_worker *worker = global_worker;
-
-	DBG("Destroying run_as worker");
-	pthread_mutex_lock(&worker_lock);
-	if (!worker) {
-		goto end;
-	}
-	/* Close unix socket */
-	DBG("Closing run_as worker socket");
-	if (lttcomm_close_unix_sock(worker->sockpair[0])) {
-		PERROR("close");
-	}
-	worker->sockpair[0] = -1;
-	/* Wait for worker. */
-	for (;;) {
-		int status;
-		pid_t wait_ret;
-
-		wait_ret = waitpid(worker->pid, &status, 0);
-		if (wait_ret < 0) {
-			if (errno == EINTR) {
-				continue;
-			}
-			PERROR("waitpid");
-			break;
-		}
-
-		if (WIFEXITED(status)) {
-			LOG(WEXITSTATUS(status) == 0 ? PRINT_DBG : PRINT_ERR,
-					DEFAULT_RUN_AS_WORKER_NAME " terminated with status code %d",
-				        WEXITSTATUS(status));
-			break;
-		} else if (WIFSIGNALED(status)) {
-			ERR(DEFAULT_RUN_AS_WORKER_NAME " was killed by signal %d",
-					WTERMSIG(status));
-			break;
-		}
-	}
-	free(worker);
-	global_worker = NULL;
-end:
-	pthread_mutex_unlock(&worker_lock);
-}