214 lines
6.2 KiB
Diff
214 lines
6.2 KiB
Diff
#
|
|
# 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
|
|
#
|
|
--- a/arch/um/drivers/mconsole.h
|
|
+++ b/arch/um/drivers/mconsole.h
|
|
@@ -85,6 +85,7 @@ extern void mconsole_cad(struct mc_reque
|
|
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);
|
|
|
|
--- a/arch/um/drivers/mconsole_kern.c
|
|
+++ b/arch/um/drivers/mconsole_kern.c
|
|
@@ -4,6 +4,7 @@
|
|
* Copyright (C) 2001 - 2008 Jeff Dike (jdike@{addtoit,linux.intel}.com)
|
|
*/
|
|
|
|
+#include <linux/kmod.h>
|
|
#include <linux/console.h>
|
|
#include <linux/ctype.h>
|
|
#include <linux/string.h>
|
|
@@ -27,6 +28,7 @@
|
|
#include <linux/mount.h>
|
|
#include <linux/file.h>
|
|
#include <linux/uaccess.h>
|
|
+#include <linux/completion.h>
|
|
#include <asm/switch_to.h>
|
|
|
|
#include <init.h>
|
|
@@ -124,6 +126,59 @@ 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 = proc_mnt;
|
|
@@ -190,6 +245,7 @@ void mconsole_proc(struct mc_request *re
|
|
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\
|
|
"
|
|
--- 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 },
|
|
};
|
|
--- a/arch/um/os-Linux/file.c
|
|
+++ b/arch/um/os-Linux/file.c
|
|
@@ -560,6 +560,8 @@ int os_create_unix_socket(const char *fi
|
|
|
|
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));
|
|
--- a/include/linux/kmod.h
|
|
+++ b/include/linux/kmod.h
|
|
@@ -32,4 +32,6 @@ static inline int request_module_nowait(
|
|
#define try_then_request_module(x, mod...) (x)
|
|
#endif
|
|
|
|
+int call_usermodehelper_stdoutpipe(struct subprocess_info *sub_info, struct file **filp);
|
|
+
|
|
#endif /* __LINUX_KMOD_H__ */
|
|
--- a/include/linux/umh.h
|
|
+++ b/include/linux/umh.h
|
|
@@ -22,6 +22,7 @@ struct subprocess_info {
|
|
const char *path;
|
|
char **argv;
|
|
char **envp;
|
|
+ struct file *stdout;
|
|
int wait;
|
|
int retval;
|
|
int (*init)(struct subprocess_info *info, struct cred *new);
|
|
--- a/kernel/umh.c
|
|
+++ b/kernel/umh.c
|
|
@@ -28,6 +28,7 @@
|
|
#include <linux/async.h>
|
|
#include <linux/uaccess.h>
|
|
#include <linux/initrd.h>
|
|
+#include <linux/pipe_fs_i.h>
|
|
|
|
#include <trace/events/module.h>
|
|
|
|
@@ -73,6 +74,28 @@ static int call_usermodehelper_exec_asyn
|
|
flush_signal_handlers(current, 1);
|
|
spin_unlock_irq(¤t->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};
|
|
+ }
|
|
+
|
|
/*
|
|
* Initial kernel threads share ther FS with init, in order to
|
|
* get the init root directory. But we've now created a new
|
|
@@ -332,6 +355,20 @@ static void helper_unlock(void)
|
|
wake_up(&running_helpers_waitq);
|
|
}
|
|
|
|
+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_setup - prepare to call a usermode helper
|
|
* @path: path to usermode executable
|