summaryrefslogtreecommitdiff
path: root/target/linux/uml/patches-3.10/101-mconsole-exec.patch
blob: eeafab19cc24f30965f341533f2fa61e18e62abd (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
#
# Minimalist mconsole exec patch 
#
# 3.10 version (with bit more synchronous behavior) by fingon at iki dot fi
# Adaptation to kernel 3.3.8 made by David Fernández (david at dit.upm.es) for 
# Starting point: mconsole-exec-2.6.30.patch for kernel 2.6.30
# Author of original patch: Paolo Giarrusso, aka Blaisorblade 
#                           (http://www.user-mode-linux.org/~blaisorblade)
#
# Known misfeatures:
#
# - If output is too long, blocks (and breaks horribly) 
# (this misfeature from 3.10 patches, when minimalizing the patch;
#  workaround: redirect to a shared filesystem if long output is expected)
#
# - Nothing useful is done with stdin
#
diff --git a/arch/um/drivers/mconsole.h b/arch/um/drivers/mconsole.h
index 8b22535..77cc5f7 100644
--- a/arch/um/drivers/mconsole.h
+++ b/arch/um/drivers/mconsole.h
@@ -85,6 +85,7 @@ extern void mconsole_cad(struct mc_request *req);
 extern void mconsole_stop(struct mc_request *req);
 extern void mconsole_go(struct mc_request *req);
 extern void mconsole_log(struct mc_request *req);
+extern void mconsole_exec(struct mc_request *req);
 extern void mconsole_proc(struct mc_request *req);
 extern void mconsole_stack(struct mc_request *req);
 
diff --git a/arch/um/drivers/mconsole_kern.c b/arch/um/drivers/mconsole_kern.c
index 3df3bd5..307bf75 100644
--- a/arch/um/drivers/mconsole_kern.c
+++ b/arch/um/drivers/mconsole_kern.c
@@ -4,6 +4,7 @@
  * Licensed under the GPL
  */
 
+#include "linux/kmod.h"
 #include <linux/console.h>
 #include <linux/ctype.h>
 #include <linux/string.h>
@@ -24,6 +25,7 @@
 #include <linux/fs.h>
 #include <linux/mount.h>
 #include <linux/file.h>
+#include <linux/completion.h>
 #include <asm/uaccess.h>
 #include <asm/switch_to.h>
 
@@ -121,6 +123,59 @@ void mconsole_log(struct mc_request *req)
 	mconsole_reply(req, "", 0, 0);
 }
 
+void mconsole_exec(struct mc_request *req)
+{
+  struct subprocess_info *sub_info;
+  int res, len;
+  struct file *out;
+  char buf[MCONSOLE_MAX_DATA];
+
+  char *envp[] = {
+    "HOME=/", "TERM=linux",
+    "PATH=/sbin:/bin:/usr/sbin:/usr/bin:/usr/local/sbin:/usr/local/bin",
+    NULL
+  };
+  char *argv[] = {
+    "/bin/sh", "-c",
+    req->request.data + strlen("exec "),
+    NULL
+  };
+
+  sub_info = call_usermodehelper_setup("/bin/sh", argv, envp, GFP_ATOMIC, NULL, NULL, NULL);
+  if (sub_info == NULL) {
+    mconsole_reply(req, "call_usermodehelper_setup failed", 1, 0);
+    return;
+  }
+  res = call_usermodehelper_stdoutpipe(sub_info, &out);
+  if (res < 0) {
+    kfree(sub_info);
+    mconsole_reply(req, "call_usermodehelper_stdoutpipe failed", 1, 0);
+    return;
+  }
+
+  res = call_usermodehelper_exec(sub_info, UMH_WAIT_PROC);
+  if (res < 0) {
+    kfree(sub_info);
+    mconsole_reply(req, "call_usermodehelper_exec failed", 1, 0);
+    return;
+  }
+
+  for (;;) {
+    len = out->f_op->read(out, buf, sizeof(buf), &out->f_pos);
+    if (len < 0) {
+      mconsole_reply(req, "reading output failed", 1, 0);
+      break;
+    }
+    if (len == 0)
+      break;
+    mconsole_reply_len(req, buf, len, 0, 1);
+  }
+  fput(out);
+
+  mconsole_reply_len(req, NULL, 0, 0, 0);
+}
+
+
 void mconsole_proc(struct mc_request *req)
 {
 	struct vfsmount *mnt = task_active_pid_ns(current)->proc_mnt;
@@ -187,6 +242,7 @@ void mconsole_proc(struct mc_request *req)
     stop - pause the UML; it will do nothing until it receives a 'go' \n\
     go - continue the UML after a 'stop' \n\
     log <string> - make UML enter <string> into the kernel log\n\
+    exec <string> - pass <string> to /bin/sh -c synchronously\n\
     proc <file> - returns the contents of the UML's /proc/<file>\n\
     stack <pid> - returns the stack of the specified pid\n\
 "
diff --git a/arch/um/drivers/mconsole_user.c b/arch/um/drivers/mconsole_user.c
index 9920982..3ed0d32 100644
--- a/arch/um/drivers/mconsole_user.c
+++ b/arch/um/drivers/mconsole_user.c
@@ -30,6 +30,7 @@ static struct mconsole_command commands[] = {
 	{ "stop", mconsole_stop, MCONSOLE_PROC },
 	{ "go", mconsole_go, MCONSOLE_INTR },
 	{ "log", mconsole_log, MCONSOLE_INTR },
+	{ "exec", mconsole_exec, MCONSOLE_PROC },
 	{ "proc", mconsole_proc, MCONSOLE_PROC },
 	{ "stack", mconsole_stack, MCONSOLE_INTR },
 };
diff --git a/arch/um/os-Linux/file.c b/arch/um/os-Linux/file.c
index c17bd6f..1c55fa8 100644
--- a/arch/um/os-Linux/file.c
+++ b/arch/um/os-Linux/file.c
@@ -519,6 +519,8 @@ int os_create_unix_socket(const char *file, int len, int close_on_exec)
 
 	addr.sun_family = AF_UNIX;
 
+	if (len > sizeof(addr.sun_path))
+		len = sizeof(addr.sun_path);
 	snprintf(addr.sun_path, len, "%s", file);
 
 	err = bind(sock, (struct sockaddr *) &addr, sizeof(addr));
diff --git a/include/linux/kmod.h b/include/linux/kmod.h
index 0555cc6..476084d 100644
--- a/include/linux/kmod.h
+++ b/include/linux/kmod.h
@@ -62,6 +62,7 @@ struct subprocess_info {
 	int wait;
 	int retval;
 	int (*init)(struct subprocess_info *info, struct cred *new);
+	struct file *stdout;
 	void (*cleanup)(struct subprocess_info *info);
 	void *data;
 };
@@ -104,4 +105,6 @@ extern int usermodehelper_read_trylock(void);
 extern long usermodehelper_read_lock_wait(long timeout);
 extern void usermodehelper_read_unlock(void);
 
+int call_usermodehelper_stdoutpipe(struct subprocess_info *sub_info, struct file **filp);
+
 #endif /* __LINUX_KMOD_H__ */
diff --git a/kernel/kmod.c b/kernel/kmod.c
index 8241906..2d7f718 100644
--- a/kernel/kmod.c
+++ b/kernel/kmod.c
@@ -39,6 +39,7 @@
 #include <linux/rwsem.h>
 #include <linux/ptrace.h>
 #include <linux/async.h>
+#include <linux/pipe_fs_i.h>
 #include <asm/uaccess.h>
 
 #include <trace/events/module.h>
@@ -206,6 +207,28 @@ static int ____call_usermodehelper(void *data)
 	flush_signal_handlers(current, 1);
 	spin_unlock_irq(&current->sighand->siglock);
 
+        /* Install output when needed */
+        if (sub_info->stdout) {
+                struct files_struct *f = current->files;
+                struct fdtable *fdt;
+
+                sys_close(1);
+                sys_close(2);
+                get_file(sub_info->stdout);
+                fd_install(1, sub_info->stdout);
+                fd_install(2, sub_info->stdout);
+                spin_lock(&f->file_lock);
+                fdt = files_fdtable(f);
+                __set_bit(1, fdt->open_fds);
+                __clear_bit(1, fdt->close_on_exec);
+                __set_bit(2, fdt->open_fds);
+                __clear_bit(2, fdt->close_on_exec);
+                spin_unlock(&f->file_lock);
+
+                /* disallow core files */
+                current->signal->rlim[RLIMIT_CORE] = (struct rlimit){0, 0};
+        }
+
 	/* We can run anywhere, unlike our parent keventd(). */
 	set_cpus_allowed_ptr(current, cpu_all_mask);
 
@@ -551,6 +574,20 @@ struct subprocess_info *call_usermodehelper_setup(char *path, char **argv,
 }
 EXPORT_SYMBOL(call_usermodehelper_setup);
 
+int call_usermodehelper_stdoutpipe(struct subprocess_info *sub_info,
+                                 struct file **filp)
+{
+  struct file *f[2];
+
+  if (create_pipe_files(f, 0)<0)
+    return PTR_ERR(f);
+  sub_info->stdout = f[1];
+  *filp = f[0];
+  return 0;
+}
+EXPORT_SYMBOL(call_usermodehelper_stdoutpipe);
+
+
 /**
  * call_usermodehelper_exec - start a usermode application
  * @sub_info: information about the subprocessa