2 * TUX - Integrated Application Protocols Layer and Object Cache
4 * Copyright (C) 2000, 2001, Ingo Molnar <mingo@redhat.com>
6 * cgi.c: user-space CGI (and other) code execution.
9 #define __KERNEL_SYSCALLS__
10 #define __KERNEL_SYSCALLS_NO_ERRNO__
14 /****************************************************************
15 * This program is free software; you can redistribute it and/or modify
16 * it under the terms of the GNU General Public License as published by
17 * the Free Software Foundation; either version 2, or (at your option)
20 * This program is distributed in the hope that it will be useful,
21 * but WITHOUT ANY WARRANTY; without even the implied warranty of
22 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
23 * GNU General Public License for more details.
25 * You should have received a copy of the GNU General Public License
26 * along with this program; if not, write to the Free Software
27 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
29 ****************************************************************/
31 static int exec_usermode(char *program_path, char *argv[], char *envp[])
33 struct files_struct *files = current->files;
37 err = tux_chroot(tux_cgiroot);
39 printk(KERN_ERR "TUX: CGI chroot returned %d, /proc/sys/net/tux/cgiroot is probably set up incorrectly! Aborting CGI execution.\n", err);
43 /* Allow execve args to be in kernel space. */
46 // TODO: is this RCU-safe?
47 spin_lock(&files->file_lock);
48 fdt = files_fdtable(files);
49 spin_unlock(&files->file_lock);
51 for (i = 3; i < fdt->max_fds; i++ )
55 err = __exec_usermodehelper(program_path, argv, envp, NULL);
61 static inline long tux_dup(unsigned int fildes)
64 struct file * file = fget(fildes);
71 static int exec_helper (void * data)
73 exec_param_t *param = data;
77 sprintf(current->comm,"doexec - %d", current->pid);
79 if (!tux_cgi_inherit_cpu) {
82 cpus_and(map, cpu_online_map, tux_cgi_cpu_mask);
84 if (!(cpus_empty(map)))
85 set_cpus_allowed(current, map);
87 set_cpus_allowed(current, cpu_online_map);
93 Dprintk("doing exec(%s).\n", param->command);
98 Dprintk("{%s} ", *tmp);
105 Dprintk("{%s} ", *tmp);
110 * Set up stdin, stdout and stderr of the external
113 if (param->pipe_fds) {
114 struct files_struct *files = current->files;
126 // do not close on exec.
127 spin_lock(&files->file_lock);
128 fdt = files_fdtable(files);
129 FD_CLR(0, fdt->close_on_exec);
130 FD_CLR(1, fdt->close_on_exec);
131 FD_CLR(2, fdt->close_on_exec);
132 spin_unlock(&files->file_lock);
134 ret = exec_usermode(param->command, param->argv, param->envp);
136 Dprintk("bug: exec() returned %d.\n", ret);
138 Dprintk("exec()-ed successfully!\n");
142 pid_t tux_exec_process (char *command, char **argv,
143 char **envp, int pipe_fds,
144 exec_param_t *param, int wait)
146 exec_param_t param_local;
148 struct k_sigaction *ka;
150 ka = current->sighand->action + SIGCHLD-1;
151 ka->sa.sa_handler = SIG_IGN;
154 param = ¶m_local;
156 param->command = command;
159 param->pipe_fds = pipe_fds;
162 pid = kernel_thread(exec_helper, (void*) param, CLONE_SIGHAND|SIGCHLD);
163 Dprintk("kernel thread created PID %d.\n", pid);
165 printk(KERN_ERR "TUX: could not create new CGI kernel thread due to %d... retrying.\n", pid);
166 current->state = TASK_UNINTERRUPTIBLE;
167 schedule_timeout(HZ);