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exec on a guest now returns the return value of the executed process

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This commit is contained in:
Tobias Brunner
2008-07-31 12:59:59 +00:00
parent 6dbce9c803
commit 5e9346ed92
3 changed files with 141 additions and 64 deletions
Download Patch File Download Diff File Expand all files Collapse all files
src/dumm/irdumm.c
+4 -3
View File
@@ -194,13 +194,14 @@ static VALUE guest_exec(VALUE self, VALUE cmd)
{
guest_t *guest;
bool block;
int ret;
block = rb_block_given_p();
Data_Get_Struct(self, guest_t, guest);
if (guest->exec_str(guest, block ? (void*)exec_cb : NULL, TRUE, NULL,
"%s", StringValuePtr(cmd)) != 0)
if ((ret = guest->exec_str(guest, block ? (void*)exec_cb : NULL, TRUE, NULL,
"%s", StringValuePtr(cmd))) != 0)
{
rb_raise(rb_eRuntimeError, "executing command failed");
rb_raise(rb_eRuntimeError, "executing command failed (%d)", ret);
}
return self;
}
src/dumm/mconsole.c
+1 -5
View File
@@ -201,11 +201,7 @@ static bool del_iface(private_mconsole_t *this, char *guest)
static int exec(private_mconsole_t *this, void(*cb)(void*,char*,size_t),
void *data, char *cmd)
{
if (request(this, cb, data, "exec %s", cmd) != 0)
{
return -1;
}
return 0;
return request(this, cb, data, "exec %s", cmd);
}
/**
src/dumm/patches/mconsole-exec-2.6.26.patch
+136 -56
View File
@@ -1,5 +1,5 @@
--- a/arch/um/drivers/mconsole_kern.c 2008-07-13 23:51:29.000000000 +0200
+++ b/arch/um/drivers/mconsole_kern.c 2008-07-15 15:41:54.000000000 +0200
+++ b/arch/um/drivers/mconsole_kern.c 2008-07-31 14:04:57.000000000 +0200
@@ -4,6 +4,7 @@
* Licensed under the GPL
*/
@@ -8,20 +8,23 @@
#include <linux/console.h>
#include <linux/ctype.h>
#include <linux/interrupt.h>
@@ -18,6 +19,7 @@
@@ -18,6 +19,8 @@
#include <linux/utsname.h>
#include <linux/workqueue.h>
#include <linux/mutex.h>
+#include <linux/completion.h>
+#include <linux/file.h>
#include <asm/uaccess.h>
#include "init.h"
@@ -199,6 +201,44 @@
@@ -199,6 +202,64 @@
}
#endif
+void mconsole_exec(struct mc_request *req)
+{
+ DECLARE_COMPLETION_ONSTACK(done);
+ struct subprocess_info *sub_info;
+ int res, len;
+ struct file *out;
+ char buf[MCONSOLE_MAX_DATA];
@@ -36,10 +39,24 @@
+ req->request.data + strlen("exec "),
+ NULL
+ };
+ res = call_usermodehelper_pipe("/bin/sh", argv, envp, NULL, &out);
+
+ sub_info = call_usermodehelper_setup("/bin/sh", argv, envp);
+ if (sub_info == NULL) {
+ mconsole_reply(req, "call_usermodehelper_setup failed", 1, 0);
+ return;
+ }
+ res = call_usermodehelper_stdoutpipe(sub_info, &out);
+ if (res < 0) {
+ mconsole_reply(req, "call_usermodehelper_pipe failed", 1, 0);
+ call_usermodehelper_freeinfo(sub_info);
+ mconsole_reply(req, "call_usermodehelper_stdoutpipe failed", 1, 0);
+ return;
+ }
+
+ call_usermodehelper_setcomplete(sub_info, &done);
+
+ res = call_usermodehelper_exec(sub_info, UMH_WAIT_EXT);
+ if (res < 0) {
+ mconsole_reply(req, "call_usermodehelper_exec failed", 1, 0);
+ return;
+ }
+
@@ -49,19 +66,23 @@
+ mconsole_reply(req, "reading output failed", 1, 0);
+ break;
+ }
+ if (len == 0) {
+ mconsole_reply_len(req, buf, len, 0, 0);
+ if (len == 0)
+ break;
+ }
+ mconsole_reply_len(req, buf, len, 0, 1);
+ }
+ fput(out);
+
+ wait_for_completion(&done);
+ res = call_usermodehelper_getretval(sub_info) >> 8;
+ call_usermodehelper_freeinfo(sub_info);
+
+ mconsole_reply_len(req, buf, len, res, 0);
+}
+
void mconsole_proc(struct mc_request *req)
{
char path[64];
@@ -270,6 +310,7 @@
@@ -270,6 +331,7 @@
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\
@@ -90,8 +111,16 @@
extern void mconsole_stack(struct mc_request *req);
--- a/kernel/kmod.c 2008-07-13 23:51:29.000000000 +0200
+++ b/kernel/kmod.c 2008-07-15 15:41:54.000000000 +0200
@@ -125,6 +125,7 @@
+++ b/kernel/kmod.c 2008-07-31 14:46:31.000000000 +0200
@@ -118,6 +118,7 @@
struct subprocess_info {
struct work_struct work;
struct completion *complete;
+ struct completion *executed;
char *path;
char **argv;
char **envp;
@@ -125,6 +126,7 @@
enum umh_wait wait;
int retval;
struct file *stdin;
@@ -99,7 +128,7 @@
void (*cleanup)(char **argv, char **envp);
};
@@ -160,8 +161,26 @@
@@ -160,8 +162,26 @@
FD_SET(0, fdt->open_fds);
FD_CLR(0, fdt->close_on_exec);
spin_unlock(&f->file_lock);
@@ -128,7 +157,53 @@
current->signal->rlim[RLIMIT_CORE] = (struct rlimit){0, 0};
}
@@ -433,6 +452,29 @@
@@ -243,7 +263,7 @@
/* CLONE_VFORK: wait until the usermode helper has execve'd
* successfully We need the data structures to stay around
* until that is done. */
- if (wait == UMH_WAIT_PROC || wait == UMH_NO_WAIT)
+ if (wait == UMH_WAIT_PROC || wait == UMH_NO_WAIT || wait == UMH_WAIT_EXT)
pid = kernel_thread(wait_for_helper, sub_info,
CLONE_FS | CLONE_FILES | SIGCHLD);
else
@@ -254,6 +274,16 @@
case UMH_NO_WAIT:
break;
+ case UMH_WAIT_EXT:
+ if (pid > 0) {
+ complete(sub_info->executed);
+ break;
+ }
+ sub_info->retval = pid;
+ complete(sub_info->executed);
+ complete(sub_info->complete);
+ break;
+
case UMH_WAIT_PROC:
if (pid > 0)
break;
@@ -404,6 +434,19 @@
}
EXPORT_SYMBOL(call_usermodehelper_setcleanup);
+void call_usermodehelper_setcomplete(struct subprocess_info *info,
+ struct completion* complete)
+{
+ info->complete = complete;
+}
+EXPORT_SYMBOL(call_usermodehelper_setcomplete);
+
+int call_usermodehelper_getretval(struct subprocess_info *info)
+{
+ return info->retval;
+}
+EXPORT_SYMBOL(call_usermodehelper_getretval);
+
/**
* call_usermodehelper_stdinpipe - set up a pipe to be used for stdin
* @sub_info: a subprocess_info returned by call_usermodehelper_setup
@@ -433,6 +476,29 @@
}
EXPORT_SYMBOL(call_usermodehelper_stdinpipe);
@@ -158,57 +233,62 @@
/**
* call_usermodehelper_exec - start a usermode application
* @sub_info: information about the subprocessa
@@ -489,7 +531,7 @@
* lower-level call_usermodehelper_* functions.
*/
int call_usermodehelper_pipe(char *path, char **argv, char **envp,
- struct file **filp)
+ struct file **in, struct file **out)
{
struct subprocess_info *sub_info;
int ret;
@@ -498,9 +540,17 @@
if (sub_info == NULL)
return -ENOMEM;
@@ -460,15 +526,22 @@
goto out;
}
- ret = call_usermodehelper_stdinpipe(sub_info, filp);
- if (ret < 0)
- goto out;
+ if (in) {
+ ret = call_usermodehelper_stdinpipe(sub_info, in);
+ if (ret < 0)
+ goto out;
+ }
- sub_info->complete = &done;
+ if (wait == UMH_WAIT_EXT)
+ sub_info->executed = &done;
+ else
+ sub_info->complete = &done;
+
+ if (out) {
+ ret = call_usermodehelper_stdoutpipe(sub_info, out);
+ if (ret < 0)
+ goto out;
+ }
sub_info->wait = wait;
return call_usermodehelper_exec(sub_info, UMH_WAIT_EXEC);
queue_work(khelper_wq, &sub_info->work);
if (wait == UMH_NO_WAIT) /* task has freed sub_info */
goto unlock;
+
wait_for_completion(&done);
- retval = sub_info->retval;
+ retval = sub_info->retval;
+ if (wait == UMH_WAIT_EXT) /* caller will free sub_info */
+ goto unlock;
out:
call_usermodehelper_freeinfo(sub_info);
unlock:
--- a/include/linux/kmod.h 2008-07-13 23:51:29.000000000 +0200
+++ b/include/linux/kmod.h 2008-07-15 15:41:54.000000000 +0200
@@ -93,6 +93,6 @@
+++ b/include/linux/kmod.h 2008-07-31 14:43:33.000000000 +0200
@@ -38,6 +38,7 @@
struct key;
struct file;
extern int call_usermodehelper_pipe(char *path, char *argv[], char *envp[],
- struct file **filp);
+ struct file **in, struct file **out);
struct subprocess_info;
+struct completion;
#endif /* __LINUX_KMOD_H__ */
--- a/fs/exec.c 2008-07-13 23:51:29.000000000 +0200
+++ b/fs/exec.c 2008-07-15 15:41:54.000000000 +0200
@@ -1741,7 +1741,7 @@
/* Allocate a subprocess_info structure */
struct subprocess_info *call_usermodehelper_setup(char *path,
@@ -48,13 +49,20 @@
struct key *session_keyring);
int call_usermodehelper_stdinpipe(struct subprocess_info *sub_info,
struct file **filp);
+int call_usermodehelper_stdoutpipe(struct subprocess_info *sub_info,
+ struct file **filp);
+void call_usermodehelper_setcomplete(struct subprocess_info *sub_info,
+ struct completion *complete);
void call_usermodehelper_setcleanup(struct subprocess_info *info,
void (*cleanup)(char **argv, char **envp));
+int call_usermodehelper_getretval(struct subprocess_info *sub_info);
/* SIGPIPE can happen, but it's just never processed */
if (call_usermodehelper_pipe(corename+1, helper_argv, NULL,
- &file)) {
+ &file, NULL)) {
printk(KERN_INFO "Core dump to %s pipe failed\n",
corename);
goto fail_unlock;
enum umh_wait {
UMH_NO_WAIT = -1, /* don't wait at all */
UMH_WAIT_EXEC = 0, /* wait for the exec, but not the process */
UMH_WAIT_PROC = 1, /* wait for the process to complete */
+ UMH_WAIT_EXT = 2, /* wait for the exec then return and signal
+ when the process is complete */
};
/* Actually execute the sub-process */
--- a/arch/um/Makefile 2008-07-13 23:51:29.000000000 +0200
+++ b/arch/um/Makefile 2008-07-15 16:27:02.000000000 +0200
@@ -77,6 +77,7 @@