TEST(spawn, posix_spawn_POSIX_SPAWN_SETSIGDEF) {
// Ignore SIGALRM and SIGCONT in the parent...
ASSERT_NE(SIG_ERR, signal(SIGALRM, SIG_IGN));
ASSERT_NE(SIG_ERR, signal(SIGCONT, SIG_IGN));
posix_spawnattr_t sa;
ASSERT_EQ(0, posix_spawnattr_init(&sa));
// Ask for SIGALRM to be defaulted in the child...
sigset_t just_SIGALRM;
sigemptyset(&just_SIGALRM);
sigaddset(&just_SIGALRM, SIGALRM);
ASSERT_EQ(0, posix_spawnattr_setsigdefault(&sa, &just_SIGALRM));
ASSERT_EQ(0, posix_spawnattr_setflags(&sa, POSIX_SPAWN_SETSIGDEF));
// Check that's what happens...
ProcStatus ps = {};
GetChildStatus(&sa, &ps);
// TIMER_SIGNAL should be blocked.
uint64_t expected_blocked = 0;
SignalSetAdd(&expected_blocked, __SIGRTMIN + 0);
EXPECT_EQ(expected_blocked, ps.sigblk);
uint64_t expected_ignored = 0;
SignalSetAdd(&expected_ignored, SIGCONT);
EXPECT_EQ(expected_ignored, ps.sigign);
ASSERT_EQ(0, posix_spawnattr_destroy(&sa));
}
static int Open (vlc_object_t *obj)
{
vlc_inhibit_t *ih = (vlc_inhibit_t *)obj;
vlc_inhibit_sys_t *p_sys = malloc (sizeof (*p_sys));
if (p_sys == NULL)
return VLC_ENOMEM;
posix_spawnattr_init (&p_sys->attr);
/* Reset signal handlers to default and clear mask in the child process */
{
sigset_t set;
sigemptyset (&set);
posix_spawnattr_setsigmask (&p_sys->attr, &set);
sigaddset (&set, SIGPIPE);
posix_spawnattr_setsigdefault (&p_sys->attr, &set);
posix_spawnattr_setflags (&p_sys->attr, POSIX_SPAWN_SETSIGDEF
| POSIX_SPAWN_SETSIGMASK);
}
ih->p_sys = p_sys;
if (vlc_timer_create (&p_sys->timer, Timer, ih))
{
posix_spawnattr_destroy (&p_sys->attr);
free (p_sys);
return VLC_ENOMEM;
}
ih->inhibit = Inhibit;
return VLC_SUCCESS;
}
/*
* Static function implementations
*/
pid_t Launch_posixSpawnSuspended(cpu_type_t cpuType, const char *path, char** argv) {
pid_t retVal = -1;
if (path == NULL || argv == NULL) {
Log_invalidArgument("path: %p, argv: %p", path, argv);
} else {
posix_spawnattr_t attr = 0;
int ret = posix_spawnattr_init(&attr);
if (ret != 0) {
Log_errorPosix(ret, "posix_spawnattr_init");
} else {
sigset_t no_signals = 0;
sigset_t all_signals = 0;
sigemptyset(&no_signals);
sigfillset(&all_signals);
posix_spawnattr_setsigmask(&attr, &no_signals);
posix_spawnattr_setsigdefault(&attr, &all_signals);
if (cpuType != CPU_TYPE_ANY) {
size_t ocount = 0;
// if specified choose the arch from the fat binary to run
ret = posix_spawnattr_setbinpref_np(&attr, 1, &cpuType, &ocount);
if (ret != 0) {
Log_errorPosix(ret, "posix_spawnattr_setbinpref_np");
}
}
if (ret == 0) {
ret = posix_spawnattr_setflags(&attr,
POSIX_SPAWN_START_SUSPENDED
| _POSIX_SPAWN_DISABLE_ASLR
| POSIX_SPAWN_SETSIGDEF
| POSIX_SPAWN_SETSIGMASK);
if (ret != 0) {
Log_errorPosix(ret, "posix_spawnattr_setflags");
} else {
pid_t pid = -1;
ret = posix_spawnp(&pid,
path,
NULL,
&attr,
(char * const*)argv,
(char * const*)NULL);
if (ret != 0) {
Log_errorPosix(ret, "posix_spawnp");
} else {
retVal = pid;
}
}
}
posix_spawnattr_destroy(&attr);
}
}
return retVal;
}
TEST(spawn, signal_stress) {
// Ensure that posix_spawn doesn't restore the caller's signal mask in the
// child without first defaulting any caught signals (http://b/68707996).
static pid_t parent = getpid();
setpgid(0, 0);
signal(SIGRTMIN, SIG_IGN);
pid_t pid = fork();
ASSERT_NE(-1, pid);
if (pid == 0) {
for (size_t i = 0; i < 1024; ++i) {
kill(0, SIGRTMIN);
usleep(10);
}
_exit(99);
}
// We test both with and without attributes, because they used to be
// different codepaths. We also test with an empty `sigdefault` set.
posix_spawnattr_t attr1;
posix_spawnattr_init(&attr1);
sigset_t empty_mask = {};
posix_spawnattr_t attr2;
posix_spawnattr_init(&attr2);
posix_spawnattr_setflags(&attr2, POSIX_SPAWN_SETSIGDEF);
posix_spawnattr_setsigdefault(&attr2, &empty_mask);
posix_spawnattr_t* attrs[] = { nullptr, &attr1, &attr2 };
// We use a real-time signal because that's a tricky case for LP32
// because our sigset_t was too small.
ScopedSignalHandler ssh(SIGRTMIN, [](int) { ASSERT_EQ(getpid(), parent); });
const size_t pid_count = 128;
pid_t spawned_pids[pid_count];
ExecTestHelper eth;
eth.SetArgs({"true", nullptr});
for (size_t i = 0; i < pid_count; ++i) {
pid_t spawned_pid;
ASSERT_EQ(0, posix_spawn(&spawned_pid, "true", nullptr, attrs[i % 3], eth.GetArgs(), nullptr));
spawned_pids[i] = spawned_pid;
}
for (pid_t spawned_pid : spawned_pids) {
ASSERT_EQ(spawned_pid, TEMP_FAILURE_RETRY(waitpid(spawned_pid, nullptr, 0)));
}
AssertChildExited(pid, 99);
}
static int l_posix_spawnattr_setsigdefault(lua_State *L) {
int r;
posix_spawnattr_t *attr = luaL_checkudata(L, 1, "posix_spawnattr_t");
sigset_t *set = luaL_checkudata(L, 2, "sigset_t");
if (0 != (r = posix_spawnattr_setsigdefault(attr, set))) {
lua_pushnil(L);
lua_pushstring(L, strerror(r));
lua_pushinteger(L, r);
return 3;
}
lua_pushboolean(L, 1);
return 1;
}
TEST(spawn, posix_spawnattr_setsigdefault_posix_spawnattr_getsigdefault) {
posix_spawnattr_t sa;
ASSERT_EQ(0, posix_spawnattr_init(&sa));
sigset_t sigs;
ASSERT_EQ(0, posix_spawnattr_getsigdefault(&sa, &sigs));
ASSERT_FALSE(sigismember(&sigs, SIGALRM));
sigset_t just_SIGALRM;
sigemptyset(&just_SIGALRM);
sigaddset(&just_SIGALRM, SIGALRM);
ASSERT_EQ(0, posix_spawnattr_setsigdefault(&sa, &just_SIGALRM));
ASSERT_EQ(0, posix_spawnattr_getsigdefault(&sa, &sigs));
ASSERT_TRUE(sigismember(&sigs, SIGALRM));
ASSERT_EQ(0, posix_spawnattr_destroy(&sa));
}
bool fork_actions_make_spawn_properties(posix_spawnattr_t *attr, posix_spawn_file_actions_t *actions, job_t *j, process_t *p, const io_chain_t &io_chain)
{
/* Initialize the output */
if (posix_spawnattr_init(attr) != 0)
{
return false;
}
if (posix_spawn_file_actions_init(actions) != 0)
{
posix_spawnattr_destroy(attr);
return false;
}
bool should_set_parent_group_id = false;
int desired_parent_group_id = 0;
if (job_get_flag(j, JOB_CONTROL))
{
should_set_parent_group_id = true;
// PCA: I'm quite fuzzy on process groups,
// but I believe that the default value of 0
// means that the process becomes its own
// group leader, which is what set_child_group did
// in this case. So we want this to be 0 if j->pgid is 0.
desired_parent_group_id = j->pgid;
}
/* Set the handling for job control signals back to the default. */
bool reset_signal_handlers = true;
/* Remove all signal blocks */
bool reset_sigmask = true;
/* Set our flags */
short flags = 0;
if (reset_signal_handlers)
flags |= POSIX_SPAWN_SETSIGDEF;
if (reset_sigmask)
flags |= POSIX_SPAWN_SETSIGMASK;
if (should_set_parent_group_id)
flags |= POSIX_SPAWN_SETPGROUP;
int err = 0;
if (! err)
err = posix_spawnattr_setflags(attr, flags);
if (! err && should_set_parent_group_id)
err = posix_spawnattr_setpgroup(attr, desired_parent_group_id);
/* Everybody gets default handlers */
if (! err && reset_signal_handlers)
{
sigset_t sigdefault;
get_signals_with_handlers(&sigdefault);
err = posix_spawnattr_setsigdefault(attr, &sigdefault);
}
/* No signals blocked */
sigset_t sigmask;
sigemptyset(&sigmask);
if (! err && reset_sigmask)
err = posix_spawnattr_setsigmask(attr, &sigmask);
for (size_t idx = 0; idx < io_chain.size(); idx++)
{
const shared_ptr<const io_data_t> io = io_chain.at(idx);
if (io->io_mode == IO_FD)
{
CAST_INIT(const io_fd_t *, io_fd, io.get());
if (io->fd == io_fd->old_fd)
continue;
}
switch (io->io_mode)
{
case IO_CLOSE:
{
if (! err)
err = posix_spawn_file_actions_addclose(actions, io->fd);
break;
}
case IO_FILE:
{
CAST_INIT(const io_file_t *, io_file, io.get());
if (! err)
err = posix_spawn_file_actions_addopen(actions, io->fd, io_file->filename_cstr, io_file->flags /* mode */, OPEN_MASK);
break;
}
case IO_FD:
{
CAST_INIT(const io_fd_t *, io_fd, io.get());
if (! err)
err = posix_spawn_file_actions_adddup2(actions, io_fd->old_fd /* from */, io->fd /* to */);
break;
}
case IO_BUFFER:
case IO_PIPE:
{
CAST_INIT(const io_pipe_t *, io_pipe, io.get());
unsigned int write_pipe_idx = (io_pipe->is_input ? 0 : 1);
int from_fd = io_pipe->pipe_fd[write_pipe_idx];
int to_fd = io->fd;
if (! err)
err = posix_spawn_file_actions_adddup2(actions, from_fd, to_fd);
if (write_pipe_idx > 0)
{
if (! err)
err = posix_spawn_file_actions_addclose(actions, io_pipe->pipe_fd[0]);
if (! err)
err = posix_spawn_file_actions_addclose(actions, io_pipe->pipe_fd[1]);
}
else
{
if (! err)
err = posix_spawn_file_actions_addclose(actions, io_pipe->pipe_fd[0]);
}
break;
}
}
}
int /* O - Process ID or 0 */
cupsdStartProcess(
const char *command, /* I - Full path to command */
char *argv[], /* I - Command-line arguments */
char *envp[], /* I - Environment */
int infd, /* I - Standard input file descriptor */
int outfd, /* I - Standard output file descriptor */
int errfd, /* I - Standard error file descriptor */
int backfd, /* I - Backchannel file descriptor */
int sidefd, /* I - Sidechannel file descriptor */
int root, /* I - Run as root? */
void *profile, /* I - Security profile to use */
cupsd_job_t *job, /* I - Job associated with process */
int *pid) /* O - Process ID */
{
int i; /* Looping var */
const char *exec_path = command; /* Command to be exec'd */
char *real_argv[110], /* Real command-line arguments */
cups_exec[1024], /* Path to "cups-exec" program */
user_str[16], /* User string */
group_str[16], /* Group string */
nice_str[16]; /* FilterNice string */
uid_t user; /* Command UID */
cupsd_proc_t *proc; /* New process record */
#if USE_POSIX_SPAWN
posix_spawn_file_actions_t actions; /* Spawn file actions */
posix_spawnattr_t attrs; /* Spawn attributes */
sigset_t defsignals; /* Default signals */
#elif defined(HAVE_SIGACTION) && !defined(HAVE_SIGSET)
struct sigaction action; /* POSIX signal handler */
#endif /* USE_POSIX_SPAWN */
#if defined(__APPLE__)
char processPath[1024], /* CFProcessPath environment variable */
linkpath[1024]; /* Link path for symlinks... */
int linkbytes; /* Bytes for link path */
#endif /* __APPLE__ */
*pid = 0;
/*
* Figure out the UID for the child process...
*/
if (RunUser)
user = RunUser;
else if (root)
user = 0;
else
user = User;
/*
* Check the permissions of the command we are running...
*/
if (_cupsFileCheck(command, _CUPS_FILE_CHECK_PROGRAM, !RunUser,
cupsdLogFCMessage, job ? job->printer : NULL))
return (0);
#if defined(__APPLE__)
if (envp)
{
/*
* Add special voodoo magic for OS X - this allows OS X programs to access
* their bundle resources properly...
*/
if ((linkbytes = readlink(command, linkpath, sizeof(linkpath) - 1)) > 0)
{
/*
* Yes, this is a symlink to the actual program, nul-terminate and
* use it...
*/
linkpath[linkbytes] = '\0';
if (linkpath[0] == '/')
snprintf(processPath, sizeof(processPath), "CFProcessPath=%s",
linkpath);
else
snprintf(processPath, sizeof(processPath), "CFProcessPath=%s/%s",
dirname((char *)command), linkpath);
}
else
snprintf(processPath, sizeof(processPath), "CFProcessPath=%s", command);
envp[0] = processPath; /* Replace <CFProcessPath> string */
}
#endif /* __APPLE__ */
/*
* Use helper program when we have a sandbox profile...
*/
#if !USE_POSIX_SPAWN
if (profile)
#endif /* !USE_POSIX_SPAWN */
{
snprintf(cups_exec, sizeof(cups_exec), "%s/daemon/cups-exec", ServerBin);
snprintf(user_str, sizeof(user_str), "%d", user);
snprintf(group_str, sizeof(group_str), "%d", Group);
snprintf(nice_str, sizeof(nice_str), "%d", FilterNice);
real_argv[0] = cups_exec;
real_argv[1] = (char *)"-g";
real_argv[2] = group_str;
real_argv[3] = (char *)"-n";
real_argv[4] = nice_str;
real_argv[5] = (char *)"-u";
real_argv[6] = user_str;
real_argv[7] = profile ? profile : "none";
real_argv[8] = (char *)command;
for (i = 0;
i < (int)(sizeof(real_argv) / sizeof(real_argv[0]) - 10) && argv[i];
i ++)
real_argv[i + 9] = argv[i];
real_argv[i + 9] = NULL;
argv = real_argv;
exec_path = cups_exec;
}
if (LogLevel == CUPSD_LOG_DEBUG2)
{
cupsdLogMessage(CUPSD_LOG_DEBUG2, "cupsdStartProcess: Preparing to start \"%s\", arguments:", command);
for (i = 0; argv[i]; i ++)
cupsdLogMessage(CUPSD_LOG_DEBUG2, "cupsdStartProcess: argv[%d] = \"%s\"", i, argv[i]);
}
#if USE_POSIX_SPAWN
/*
* Setup attributes and file actions for the spawn...
*/
cupsdLogMessage(CUPSD_LOG_DEBUG2, "cupsdStartProcess: Setting spawn attributes.");
sigemptyset(&defsignals);
sigaddset(&defsignals, SIGTERM);
sigaddset(&defsignals, SIGCHLD);
sigaddset(&defsignals, SIGPIPE);
posix_spawnattr_init(&attrs);
posix_spawnattr_setflags(&attrs, POSIX_SPAWN_SETPGROUP | POSIX_SPAWN_SETSIGDEF);
posix_spawnattr_setpgroup(&attrs, 0);
posix_spawnattr_setsigdefault(&attrs, &defsignals);
cupsdLogMessage(CUPSD_LOG_DEBUG2, "cupsdStartProcess: Setting file actions.");
posix_spawn_file_actions_init(&actions);
if (infd != 0)
{
if (infd < 0)
posix_spawn_file_actions_addopen(&actions, 0, "/dev/null", O_RDONLY, 0);
else
posix_spawn_file_actions_adddup2(&actions, infd, 0);
}
if (outfd != 1)
{
if (outfd < 0)
posix_spawn_file_actions_addopen(&actions, 1, "/dev/null", O_WRONLY, 0);
else
posix_spawn_file_actions_adddup2(&actions, outfd, 1);
}
if (errfd != 2)
{
if (errfd < 0)
posix_spawn_file_actions_addopen(&actions, 2, "/dev/null", O_WRONLY, 0);
else
posix_spawn_file_actions_adddup2(&actions, errfd, 2);
}
if (backfd != 3 && backfd >= 0)
posix_spawn_file_actions_adddup2(&actions, backfd, 3);
if (sidefd != 4 && sidefd >= 0)
posix_spawn_file_actions_adddup2(&actions, sidefd, 4);
cupsdLogMessage(CUPSD_LOG_DEBUG2, "cupsdStartProcess: Calling posix_spawn.");
if (posix_spawn(pid, exec_path, &actions, &attrs, argv, envp ? envp : environ))
{
cupsdLogMessage(CUPSD_LOG_ERROR, "Unable to fork %s - %s.", command, strerror(errno));
*pid = 0;
}
else
cupsdLogMessage(CUPSD_LOG_DEBUG2, "cupsdStartProcess: pid=%d", (int)*pid);
posix_spawn_file_actions_destroy(&actions);
posix_spawnattr_destroy(&attrs);
#else
/*
* Block signals before forking...
*/
cupsdHoldSignals();
if ((*pid = fork()) == 0)
{
/*
* Child process goes here; update stderr as needed...
*/
if (errfd != 2)
{
if (errfd < 0)
errfd = open("/dev/null", O_WRONLY);
if (errfd != 2)
{
dup2(errfd, 2);
close(errfd);
}
}
/*
* Put this process in its own process group so that we can kill any child
* processes it creates.
*/
# ifdef HAVE_SETPGID
if (!RunUser && setpgid(0, 0))
exit(errno + 100);
# else
if (!RunUser && setpgrp())
exit(errno + 100);
# endif /* HAVE_SETPGID */
/*
* Update the remaining file descriptors as needed...
*/
if (infd != 0)
{
if (infd < 0)
infd = open("/dev/null", O_RDONLY);
if (infd != 0)
{
dup2(infd, 0);
close(infd);
}
}
if (outfd != 1)
{
if (outfd < 0)
outfd = open("/dev/null", O_WRONLY);
if (outfd != 1)
{
dup2(outfd, 1);
close(outfd);
}
}
if (backfd != 3 && backfd >= 0)
{
dup2(backfd, 3);
close(backfd);
fcntl(3, F_SETFL, O_NDELAY);
}
if (sidefd != 4 && sidefd >= 0)
{
dup2(sidefd, 4);
close(sidefd);
fcntl(4, F_SETFL, O_NDELAY);
}
/*
* Change the priority of the process based on the FilterNice setting.
* (this is not done for root processes...)
*/
if (!root)
nice(FilterNice);
/*
* Reset group membership to just the main one we belong to.
*/
if (!RunUser && setgid(Group))
exit(errno + 100);
if (!RunUser && setgroups(1, &Group))
exit(errno + 100);
/*
* Change user to something "safe"...
*/
if (!RunUser && user && setuid(user))
exit(errno + 100);
/*
* Change umask to restrict permissions on created files...
*/
umask(077);
/*
* Unblock signals before doing the exec...
*/
# ifdef HAVE_SIGSET
sigset(SIGTERM, SIG_DFL);
sigset(SIGCHLD, SIG_DFL);
sigset(SIGPIPE, SIG_DFL);
# elif defined(HAVE_SIGACTION)
memset(&action, 0, sizeof(action));
sigemptyset(&action.sa_mask);
action.sa_handler = SIG_DFL;
sigaction(SIGTERM, &action, NULL);
sigaction(SIGCHLD, &action, NULL);
sigaction(SIGPIPE, &action, NULL);
# else
signal(SIGTERM, SIG_DFL);
signal(SIGCHLD, SIG_DFL);
signal(SIGPIPE, SIG_DFL);
# endif /* HAVE_SIGSET */
cupsdReleaseSignals();
/*
* Execute the command; if for some reason this doesn't work, log an error
* exit with a non-zero value...
*/
if (envp)
execve(exec_path, argv, envp);
else
execv(exec_path, argv);
exit(errno + 100);
}
else if (*pid < 0)
{
/*
* Error - couldn't fork a new process!
*/
cupsdLogMessage(CUPSD_LOG_ERROR, "Unable to fork %s - %s.", command,
strerror(errno));
*pid = 0;
}
cupsdReleaseSignals();
#endif /* USE_POSIX_SPAWN */
if (*pid)
{
if (!process_array)
process_array = cupsArrayNew((cups_array_func_t)compare_procs, NULL);
if (process_array)
{
if ((proc = calloc(1, sizeof(cupsd_proc_t) + strlen(command))) != NULL)
{
proc->pid = *pid;
proc->job_id = job ? job->id : 0;
_cups_strcpy(proc->name, command);
cupsArrayAdd(process_array, proc);
}
}
}
cupsdLogMessage(CUPSD_LOG_DEBUG2,
"cupsdStartProcess(command=\"%s\", argv=%p, envp=%p, "
"infd=%d, outfd=%d, errfd=%d, backfd=%d, sidefd=%d, root=%d, "
"profile=%p, job=%p(%d), pid=%p) = %d",
command, argv, envp, infd, outfd, errfd, backfd, sidefd,
root, profile, job, job ? job->id : 0, pid, *pid);
return (*pid);
}
// __UNIX__ (not windows)
static int fork_and_ptraceme_for_mac(RIO *io, int bits, const char *cmd) {
bool runprofile = io->runprofile && *(io->runprofile);
pid_t p = -1;
char **argv;
posix_spawn_file_actions_t fileActions;
ut32 ps_flags = POSIX_SPAWN_SETSIGDEF | POSIX_SPAWN_SETSIGMASK;
sigset_t no_signals;
sigset_t all_signals;
size_t copied = 1;
cpu_type_t cpu = CPU_TYPE_ANY;
posix_spawnattr_t attr = {0};
posix_spawnattr_init (&attr);
sigemptyset (&no_signals);
sigfillset (&all_signals);
posix_spawnattr_setsigmask (&attr, &no_signals);
posix_spawnattr_setsigdefault (&attr, &all_signals);
posix_spawn_file_actions_init (&fileActions);
posix_spawn_file_actions_addinherit_np (&fileActions, STDIN_FILENO);
posix_spawn_file_actions_addinherit_np (&fileActions, STDOUT_FILENO);
posix_spawn_file_actions_addinherit_np (&fileActions, STDERR_FILENO);
ps_flags |= POSIX_SPAWN_CLOEXEC_DEFAULT;
ps_flags |= POSIX_SPAWN_START_SUSPENDED;
#define _POSIX_SPAWN_DISABLE_ASLR 0x0100
if (!runprofile) {
int ret, useASLR = io->aslr;
char *_cmd = io->args
? r_str_appendf (strdup (cmd), " %s", io->args)
: strdup (cmd);
argv = r_str_argv (_cmd, NULL);
if (!argv) {
free (_cmd);
return -1;
}
if (!*argv) {
r_str_argv_free (argv);
free (_cmd);
eprintf ("Invalid execvp\n");
return -1;
}
if (useASLR != -1) {
if (!useASLR) {
ps_flags |= _POSIX_SPAWN_DISABLE_ASLR;
}
}
(void)posix_spawnattr_setflags (&attr, ps_flags);
#if __x86_64__
if (bits == 32) {
cpu = CPU_TYPE_I386;
// cpu |= CPU_ARCH_ABI64;
}
#endif
posix_spawnattr_setbinpref_np (&attr, 1, &cpu, &copied);
{
char *dst = r_file_readlink (argv[0]);
if (dst) {
argv[0] = dst;
}
}
// XXX: this is a workaround to fix spawning programs with spaces in path
if (strstr (argv[0], "\\ ")) {
argv[0] = r_str_replace (argv[0], "\\ ", " ", true);
}
ret = posix_spawnp (&p, argv[0], &fileActions, &attr, argv, NULL);
handle_posix_error (ret);
posix_spawn_file_actions_destroy (&fileActions);
r_str_argv_free (argv);
free (_cmd);
return p;
}
int ret;
argv = r_str_argv (cmd, NULL);
if (!argv) {
posix_spawn_file_actions_destroy (&fileActions);
return -1;
}
RRunProfile *rp = _get_run_profile (io, bits, argv);
if (!rp) {
r_str_argv_free (argv);
posix_spawn_file_actions_destroy (&fileActions);
return -1;
}
handle_posix_redirection (rp, &fileActions);
if (rp->_args[0]) {
if (!rp->_aslr) {
ps_flags |= _POSIX_SPAWN_DISABLE_ASLR;
}
#if __x86_64__
if (rp->_bits == 32) {
cpu = CPU_TYPE_I386;
}
#endif
(void)posix_spawnattr_setflags (&attr, ps_flags);
posix_spawnattr_setbinpref_np (&attr, 1, &cpu, &copied);
ret = posix_spawnp (&p, rp->_args[0], &fileActions, &attr, rp->_args, NULL);
handle_posix_error (ret);
}
r_str_argv_free (argv);
r_run_free (rp);
posix_spawn_file_actions_destroy (&fileActions);
return p; // -1 ?
}
/*
* non-zero return is success
*/
EXPORT
BOOL CreateProcessA(LPCTSTR lpApplicationName,
LPTSTR lpCommandLine,
LPSECURITY_ATTRIBUTES lpProcessAttributes,
LPSECURITY_ATTRIBUTES lpThreadAttributes,
BOOL bInheritHandles,
DWORD dwCreationFlags,
LPVOID lpEnvironment,
LPCTSTR lpCurrentDirectory,
LPSTARTUPINFO lpStartupInfo,
LPPROCESS_INFORMATION lpProcessInformation )
{
// problem here in OS X because we are not suspending the target so it will happily run ! :-)
// we need to use ptrace to start the new target in a suspended state, which happens in Win32 with
// the DEBUG_PROCESS/DEBUG_ONLY_THIS_PROCESS flags to CreateProcessA
// fG! - 04/10/2010
#if DEBUG
printf("[DEBUG] Creating process %s %s\n", lpApplicationName, lpCommandLine);
#endif
posix_spawnattr_t attr;
int retval = 0;
size_t copied = 0;
short flags = 0;
cpu_type_t cpu = 0;
#if defined (__arm__)
cpu = CPU_TYPE_ARM; // ooops... distinction is done at subtype which
// posix_spawn doesn't support
// lldb solution seems to not set this - must test
#else
// default target is 32bits
cpu = CPU_TYPE_I386;
if (dwCreationFlags & TARGET_IS_64BITS)
cpu = CPU_TYPE_X86_64;
#endif
retval = posix_spawnattr_init (&attr);
// set process flags
// the new process will start in a suspended state and permissions reset to real uid/gid
flags = POSIX_SPAWN_RESETIDS | POSIX_SPAWN_START_SUSPENDED;
// disable ASLR, default is YES from PyDbg
// Snow Leopard will just ignore this flag
if (dwCreationFlags & _POSIX_SPAWN_DISABLE_ASLR)
flags |= _POSIX_SPAWN_DISABLE_ASLR;
retval = posix_spawnattr_setflags(&attr, flags);
// reset signals, ripped from LLDB :-]
sigset_t no_signals;
sigset_t all_signals;
sigemptyset (&no_signals);
sigfillset (&all_signals);
posix_spawnattr_setsigmask(&attr, &no_signals);
posix_spawnattr_setsigdefault(&attr, &all_signals);
// set the target cpu to be used, due to fat binaries
retval = posix_spawnattr_setbinpref_np(&attr, 1, &cpu, &copied);
char *spawnedEnv[] = { NULL };
int cmd_line_len = strlen(lpCommandLine);
if (cmd_line_len >= ARG_MAX)
{
fprintf(stderr, "[ERROR] arg list too long\n");
exit(1);
}
if (cmd_line_len)
{
// parse command line;
int i = 0;
char *p = strchr(lpCommandLine, ' ');
char *q = lpCommandLine;
char **argv = malloc(sizeof(char*) * 256);
while (p && i < 253)
{
*p = '\0';
argv[i++] = q;
q = p + 1;
p = strchr(q, ' ');
}
errno = 0;
argv[i] = q;
argv[i+1] = NULL;
#if DEBUG
printf("[DEBUG] Spawning %s %s %s\n", argv[0], argv[1], argv[2]);
#endif
fflush(stdout);
retval = posix_spawn(&target_pid, argv[0], NULL, &attr, argv, spawnedEnv);
if(retval)
{
fprintf(stderr, "[ERROR] Could not spawn debuggee: %s\n", strerror(retval));
exit(1);
}
free(argv);
}
else
{
fflush(stdout);
// execute with no arguments
char *argv[] = {lpApplicationName, NULL};
#if DEBUG
printf("[DEBUG] Spawning %s...\n", lpApplicationName);
#endif
retval = posix_spawnp(&target_pid, argv[0], NULL, &attr, argv, spawnedEnv);
if (retval)
{
fprintf(stderr, "[ERROR] Could not spawn debuggee: %s\n", strerror(retval));
exit(1);
}
}
// parent
// initialize the mach port into the debugee
retval = DebugActiveProcess(target_pid);
// failed to attach
if (retval == 0)
{
kill(target_pid, SIGCONT); // leave no zombies behind!
kill(target_pid, SIGKILL);
return 0;
}
// suspend all threads
suspend_all_threads(target_pid);
// and now we can continue the process, threads are still suspended!
kill(target_pid, SIGCONT);
fflush(stdout);
lpProcessInformation->hProcess = target_pid;
lpProcessInformation->dwProcessId = target_pid;
return 1;
}
// __UNIX__ (not windows)
static int fork_and_ptraceme(RIO *io, int bits, const char *cmd) {
bool runprofile = io->runprofile && *(io->runprofile);
char **argv;
#if __APPLE__ && !__POWERPC__
pid_t p = -1;
posix_spawn_file_actions_t fileActions;
ut32 ps_flags = POSIX_SPAWN_SETSIGDEF | POSIX_SPAWN_SETSIGMASK;
sigset_t no_signals;
sigset_t all_signals;
size_t copied = 1;
cpu_type_t cpu = CPU_TYPE_ANY;
posix_spawnattr_t attr = {0};
posix_spawnattr_init (&attr);
sigemptyset (&no_signals);
sigfillset (&all_signals);
posix_spawnattr_setsigmask (&attr, &no_signals);
posix_spawnattr_setsigdefault (&attr, &all_signals);
posix_spawn_file_actions_init (&fileActions);
posix_spawn_file_actions_addinherit_np (&fileActions, STDIN_FILENO);
posix_spawn_file_actions_addinherit_np (&fileActions, STDOUT_FILENO);
posix_spawn_file_actions_addinherit_np (&fileActions, STDERR_FILENO);
ps_flags |= POSIX_SPAWN_CLOEXEC_DEFAULT;
ps_flags |= POSIX_SPAWN_START_SUSPENDED;
#define _POSIX_SPAWN_DISABLE_ASLR 0x0100
if (!runprofile) {
int ret, useASLR = io->aslr;
char *_cmd = io->args
? r_str_appendf (strdup (cmd), " %s", io->args)
: strdup (cmd);
argv = r_str_argv (_cmd, NULL);
if (!argv) {
free (_cmd);
return -1;
}
if (!*argv) {
r_str_argv_free (argv);
free (_cmd);
eprintf ("Invalid execvp\n");
return -1;
}
if (useASLR != -1) {
if (!useASLR) {
ps_flags |= _POSIX_SPAWN_DISABLE_ASLR;
}
}
(void)posix_spawnattr_setflags (&attr, ps_flags);
#if __x86_64__
if (bits == 32) {
cpu = CPU_TYPE_I386;
// cpu |= CPU_ARCH_ABI64;
}
#endif
posix_spawnattr_setbinpref_np (&attr, 1, &cpu, &copied);
{
char *dst = r_file_readlink (argv[0]);
if (dst) {
argv[0] = dst;
}
}
ret = posix_spawnp (&p, argv[0], NULL, &attr, argv, NULL);
handle_posix_error (ret);
posix_spawn_file_actions_destroy (&fileActions);
r_str_argv_free (argv);
free (_cmd);
return p;
} else {
int ret;
argv = r_str_argv (cmd, NULL);
if (!argv) {
posix_spawn_file_actions_destroy (&fileActions);
return -1;
}
RRunProfile *rp = _get_run_profile (io, bits, argv);
if (!rp) {
r_str_argv_free (argv);
posix_spawn_file_actions_destroy (&fileActions);
return -1;
}
handle_posix_redirection (rp, &fileActions);
if (rp->_args[0]) {
if (!rp->_aslr) {
ps_flags |= _POSIX_SPAWN_DISABLE_ASLR;
}
#if __x86_64__
if (rp->_bits == 32) {
cpu = CPU_TYPE_I386;
}
#endif
(void)posix_spawnattr_setflags (&attr, ps_flags);
posix_spawnattr_setbinpref_np (&attr, 1, &cpu, &copied);
ret = posix_spawnp (&p, rp->_args[0], &fileActions, &attr, rp->_args, NULL);
handle_posix_error (ret);
}
r_str_argv_free (argv);
r_run_free (rp);
posix_spawn_file_actions_destroy (&fileActions);
return p;
}
posix_spawn_file_actions_destroy (&fileActions);
return -1;
#endif
int ret, status, child_pid;
child_pid = r_sys_fork ();
switch (child_pid) {
case -1:
perror ("fork_and_ptraceme");
break;
case 0:
if (runprofile) {
argv = r_str_argv (cmd, NULL);
if (!argv) {
exit(1);
}
RRunProfile *rp = _get_run_profile (io, bits, argv);
if (!rp) {
r_str_argv_free (argv);
exit (1);
}
trace_me ();
r_run_start (rp);
r_run_free (rp);
r_str_argv_free (argv);
exit (1);
} else {
char *_cmd = io->args ?
r_str_appendf (strdup (cmd), " %s", io->args) :
strdup (cmd);
trace_me ();
argv = r_str_argv (_cmd, NULL);
if (!argv) {
free (_cmd);
return -1;
}
if (argv && *argv) {
int i;
for (i = 3; i < 1024; i++)
(void)close (i);
execvp (argv[0], argv);
} else {
eprintf ("Invalid execvp\n");
}
r_str_argv_free (argv);
free (_cmd);
}
perror ("fork_and_attach: execv");
//printf(stderr, "[%d] %s execv failed.\n", getpid(), ps.filename);
exit (MAGIC_EXIT); /* error */
return 0; // invalid pid // if exit is overriden.. :)
default:
/* XXX: clean this dirty code */
do {
ret = wait (&status);
if (ret == -1) return -1;
if (ret != child_pid) {
eprintf ("Wait event received by "
"different pid %d\n", ret);
}
} while (ret != child_pid);
if (WIFSTOPPED (status)) {
eprintf ("Process with PID %d started...\n", (int)child_pid);
}
if (WEXITSTATUS (status) == MAGIC_EXIT) {
child_pid = -1;
}
// XXX kill (pid, SIGSTOP);
break;
}
return child_pid;
}
static void trace_me () {
#if __APPLE__
signal (SIGTRAP, SIG_IGN); //NEED BY STEP
#endif
#if __APPLE__ || __BSD__
/* we can probably remove this #if..as long as PT_TRACE_ME is redefined for OSX in r_debug.h */
signal (SIGABRT, inferior_abort_handler);
if (ptrace (PT_TRACE_ME, 0, 0, 0) != 0) {
#else
if (ptrace (PTRACE_TRACEME, 0, NULL, NULL) != 0) {
#endif
r_sys_perror ("ptrace-traceme");
exit (MAGIC_EXIT);
}
}
// __UNIX__ (not windows)
static int fork_and_ptraceme(RIO *io, int bits, const char *cmd) {
bool runprofile = io->runprofile && *(io->runprofile);
char **argv;
#if __APPLE__ && !__POWERPC__
if (!runprofile) {
#define _POSIX_SPAWN_DISABLE_ASLR 0x0100
posix_spawn_file_actions_t fileActions;
ut32 ps_flags = POSIX_SPAWN_SETSIGDEF |
POSIX_SPAWN_SETSIGMASK;
sigset_t no_signals;
sigset_t all_signals;
sigemptyset (&no_signals);
sigfillset (&all_signals);
posix_spawnattr_t attr = {0};
size_t copied = 1;
cpu_type_t cpu;
pid_t p = -1;
int ret, useASLR = io->aslr;
char *_cmd = io->args ?
r_str_concatf (strdup (cmd), " %s", io->args) :
strdup (cmd);
argv = r_str_argv (_cmd, NULL);
if (!argv) {
free (_cmd);
return -1;
}
if (!*argv) {
r_str_argv_free (argv);
free (_cmd);
eprintf ("Invalid execvp\n");
return -1;
}
posix_spawnattr_init (&attr);
if (useASLR != -1) {
if (!useASLR) ps_flags |= _POSIX_SPAWN_DISABLE_ASLR;
}
posix_spawn_file_actions_init (&fileActions);
posix_spawn_file_actions_addinherit_np (&fileActions, STDIN_FILENO);
posix_spawn_file_actions_addinherit_np (&fileActions, STDOUT_FILENO);
posix_spawn_file_actions_addinherit_np (&fileActions, STDERR_FILENO);
ps_flags |= POSIX_SPAWN_CLOEXEC_DEFAULT;
ps_flags |= POSIX_SPAWN_START_SUSPENDED;
posix_spawnattr_setsigmask(&attr, &no_signals);
posix_spawnattr_setsigdefault(&attr, &all_signals);
(void)posix_spawnattr_setflags (&attr, ps_flags);
#if __i386__ || __x86_64__
cpu = CPU_TYPE_I386;
if (bits == 64) cpu |= CPU_ARCH_ABI64;
#else
cpu = CPU_TYPE_ANY;
#endif
posix_spawnattr_setbinpref_np (&attr, 1, &cpu, &copied);
{
char *dst = r_file_readlink (argv[0]);
if (dst) {
argv[0] = dst;
}
}
ret = posix_spawnp (&p, argv[0], &fileActions, &attr, argv, NULL);
switch (ret) {
case 0:
// eprintf ("Success\n");
break;
case 22:
eprintf ("posix_spawnp: Invalid argument\n");
break;
case 86:
eprintf ("Unsupported architecture\n");
break;
default:
eprintf ("posix_spawnp: unknown error %d\n", ret);
perror ("posix_spawnp");
break;
}
posix_spawn_file_actions_destroy (&fileActions);
r_str_argv_free (argv);
free (_cmd);
return p;
}
#endif
int ret, status, child_pid;
child_pid = r_sys_fork ();
switch (child_pid) {
case -1:
perror ("fork_and_ptraceme");
break;
case 0:
if (runprofile) {
char *expr = NULL;
int i;
RRunProfile *rp = r_run_new (NULL);
argv = r_str_argv (cmd, NULL);
for (i = 0; argv[i]; i++) {
rp->_args[i] = argv[i];
}
rp->_args[i] = NULL;
rp->_program = argv[0];
rp->_dodebug = true;
if (io->runprofile && *io->runprofile) {
if (!r_run_parsefile (rp, io->runprofile)) {
eprintf ("Can't find profile '%s'\n",
io->runprofile);
exit (MAGIC_EXIT);
}
}
if (bits == 64)
r_run_parseline (rp, expr=strdup ("bits=64"));
else if (bits == 32)
r_run_parseline (rp, expr=strdup ("bits=32"));
free (expr);
if (r_run_config_env (rp)) {
eprintf ("Can't config the environment.\n");
exit (1);
}
trace_me ();
r_run_start (rp);
r_run_free (rp);
r_str_argv_free (argv);
exit (1);
} else {
char *_cmd = io->args ?
r_str_concatf (strdup (cmd), " %s", io->args) :
strdup (cmd);
trace_me ();
argv = r_str_argv (_cmd, NULL);
if (!argv) {
free (_cmd);
return -1;
}
if (argv && *argv) {
int i;
for (i = 3; i < 1024; i++)
(void)close (i);
execvp (argv[0], argv);
} else {
eprintf ("Invalid execvp\n");
}
r_str_argv_free (argv);
free (_cmd);
}
perror ("fork_and_attach: execv");
//printf(stderr, "[%d] %s execv failed.\n", getpid(), ps.filename);
exit (MAGIC_EXIT); /* error */
return 0; // invalid pid // if exit is overriden.. :)
default:
/* XXX: clean this dirty code */
do {
ret = wait (&status);
if (ret == -1) return -1;
if (ret != child_pid) {
eprintf ("Wait event received by "
"different pid %d\n", ret);
}
} while (ret != child_pid);
if (WIFSTOPPED (status))
eprintf ("Process with PID %d started...\n", (int)child_pid);
if (WEXITSTATUS (status) == MAGIC_EXIT)
child_pid = -1;
// XXX kill (pid, SIGSTOP);
break;
}
return child_pid;
}
/*
*
* This starts a child process determined by command. If command contains a
* slash then it is assumed to be a full path; otherwise the path is searched
* for an executable file with the name command. Command is also used as
* argv[0] of the new process. The rest of the arguments of the function
* up to the first NULL make up pointers to arguments of the new process.
*
* This function returns child exit status on success and -1 on failure.
*
* NOTE: original_sigmask must be set before this function is called.
*/
int
start_childv(const char *command, char const * const *argv)
{
posix_spawnattr_t attr;
sigset_t fullset;
int i, rc, status, n;
pid_t pid;
char vbuf[1024];
vbuf[0] = 0;
n = sizeof (vbuf);
for (i = 1; argv[i] != NULL && n > 2; i++) {
n -= strlcat(vbuf, " ", n);
n -= strlcat(vbuf, argv[i], n);
}
if (argv[i] != NULL || n < 0)
syslog(LOG_ERR, "start_childv can't log full arg vector");
if ((rc = posix_spawnattr_init(&attr)) != 0) {
dprintf("posix_spawnattr_init %d %s\n", rc, strerror(rc));
return (-1);
}
(void) sigfillset(&fullset);
if ((rc = posix_spawnattr_setsigdefault(&attr, &fullset)) != 0) {
dprintf("setsigdefault %d %s\n", rc, strerror(rc));
return (-1);
}
if ((rc = posix_spawnattr_setsigmask(&attr, &original_sigmask)) != 0) {
dprintf("setsigmask %d %s\n", rc, strerror(rc));
return (-1);
}
if ((rc = posix_spawnattr_setflags(&attr,
POSIX_SPAWN_SETSIGDEF|POSIX_SPAWN_SETSIGMASK)) != 0) {
dprintf("setflags %d %s\n", rc, strerror(rc));
return (-1);
}
if ((rc = posix_spawnp(&pid, command, NULL, &attr, (char * const *)argv,
environ)) > 0) {
dprintf("posix_spawnp failed errno %d", rc);
return (-1);
}
if ((rc = posix_spawnattr_destroy(&attr)) != 0) {
dprintf("posix_spawn_attr_destroy %d %s\n", rc, strerror(rc));
return (-1);
}
(void) waitpid(pid, &status, 0);
if (WIFSIGNALED(status) || WIFSTOPPED(status)) {
i = WIFSIGNALED(status) ? WTERMSIG(status) : WSTOPSIG(status);
syslog(LOG_ERR, "'%s%s' %s with signal %d (%s)", command, vbuf,
(WIFSIGNALED(status) ? "terminated" : "stopped"), i,
strsignal(i));
return (-2);
} else {
syslog(LOG_INFO, "'%s%s' completed normally: %d", command, vbuf,
WEXITSTATUS(status));
return (WEXITSTATUS(status));
}
}