path: root/src/dumm/patches/mconsole-exec-2.6.27.patch

--- a/arch/um/drivers/mconsole_kern.c	2008-07-13 23:51:29.000000000 +0200
+++ b/arch/um/drivers/mconsole_kern.c	2008-10-07 11:03:31.000000000 +0200
@@ -4,6 +4,7 @@
  * Licensed under the GPL
  */
 
+#include "linux/kmod.h"
 #include <linux/console.h>
 #include <linux/ctype.h>
 #include <linux/interrupt.h>
@@ -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 +202,65 @@
 }
 #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];
+
+	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);
+	if (sub_info == NULL) {
+		mconsole_reply(req, "call_usermodehelper_setup failed", 1, 0);
+		return;
+	}
+	res = call_usermodehelper_stdoutpipe(sub_info, &out);
+	if (res < 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) {
+		call_usermodehelper_freeinfo(sub_info);
+		mconsole_reply(req, "call_usermodehelper_exec failed", 1, 0);
+		return;
+	}
+	
+	for (;;) {
+		len = out->f_op->read(out, buf, sizeof(buf), 0);
+		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);
+	
+	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 +332,7 @@
     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\
+    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	2008-07-13 23:51:29.000000000 +0200
+++ b/arch/um/drivers/mconsole_user.c	2008-10-07 11:00:55.000000000 +0200
@@ -32,6 +32,7 @@
 	{ "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/include/mconsole.h	2008-07-13 23:51:29.000000000 +0200
+++ b/arch/um/include/mconsole.h	2008-10-07 11:00:55.000000000 +0200
@@ -85,6 +85,7 @@
 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/kernel/kmod.c	2008-10-07 10:31:12.000000000 +0200
+++ b/kernel/kmod.c	2008-10-07 11:07:37.000000000 +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;
+	struct file *stdout;
 	void (*cleanup)(char **argv, char **envp);
 };
 
@@ -160,8 +162,26 @@
 		FD_SET(0, fdt->open_fds);
 		FD_CLR(0, fdt->close_on_exec);
 		spin_unlock(&f->file_lock);
-
-		/* and disallow core files too */
+	}
+	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);
+		FD_SET(1, fdt->open_fds);
+		FD_CLR(1, fdt->close_on_exec);
+		FD_SET(2, fdt->open_fds);
+		FD_CLR(2, fdt->close_on_exec);
+		spin_unlock(&f->file_lock);
+	}
+	if (sub_info->stdin || sub_info->stdout) {
+		/* disallow core files */
 		current->signal->rlim[RLIMIT_CORE] = (struct rlimit){0, 0};
 	}
 
@@ -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;
@@ -405,6 +435,19 @@
 }
 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
@@ -434,6 +477,29 @@
 }
 EXPORT_SYMBOL(call_usermodehelper_stdinpipe);
 
+int call_usermodehelper_stdoutpipe(struct subprocess_info *sub_info,
+				  struct file **filp)
+{
+	struct file *f;
+
+	f = create_write_pipe(0);
+	if (IS_ERR(f))
+		return PTR_ERR(f);
+	sub_info->stdout = f;
+
+	f = create_read_pipe(f, 0);
+	if (IS_ERR(f)) {
+		free_write_pipe(sub_info->stdout);
+		sub_info->stdout = NULL;
+		return PTR_ERR(f);
+	}
+	*filp = f;
+
+	return 0;
+}
+EXPORT_SYMBOL(call_usermodehelper_stdoutpipe);
+
+
 /**
  * call_usermodehelper_exec - start a usermode application
  * @sub_info: information about the subprocessa
@@ -461,15 +527,22 @@
 		goto out;
 	}
 
-	sub_info->complete = &done;
+	if (wait == UMH_WAIT_EXT)
+		sub_info->executed = &done;
+	else
+		sub_info->complete = &done;
+
 	sub_info->wait = wait;
 
 	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	2008-10-07 10:31:11.000000000 +0200
+++ b/include/linux/kmod.h	2008-10-07 11:00:55.000000000 +0200
@@ -40,6 +40,7 @@
 struct key;
 struct file;
 struct subprocess_info;
+struct completion;
 
 /* Allocate a subprocess_info structure */
 struct subprocess_info *call_usermodehelper_setup(char *path, char **argv,
@@ -50,13 +51,20 @@
 				 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);
 
 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	2008-10-07 11:00:55.000000000 +0200
@@ -77,6 +77,7 @@
 KERNEL_DEFINES = $(strip -Derrno=kernel_errno -Dsigprocmask=kernel_sigprocmask \
 			 -Dmktime=kernel_mktime $(ARCH_KERNEL_DEFINES))
 KBUILD_CFLAGS += $(KERNEL_DEFINES)
+KBUILD_CFLAGS += $(call cc-option,-fno-unit-at-a-time,)
 
 PHONY += linux
 
--- a/arch/um/Makefile-i386	2008-07-13 23:51:29.000000000 +0200
+++ b/arch/um/Makefile-i386	2008-10-07 11:00:55.000000000 +0200
@@ -32,11 +32,4 @@
 # an unresolved reference.
 cflags-y += -ffreestanding
 
-# Disable unit-at-a-time mode on pre-gcc-4.0 compilers, it makes gcc use
-# a lot more stack due to the lack of sharing of stacklots.  Also, gcc
-# 4.3.0 needs -funit-at-a-time for extern inline functions.
-KBUILD_CFLAGS += $(shell if [ $(call cc-version) -lt 0400 ] ; then \
-			echo $(call cc-option,-fno-unit-at-a-time); \
-			else echo $(call cc-option,-funit-at-a-time); fi ;)
-
 KBUILD_CFLAGS += $(cflags-y)
--- a/arch/um/Makefile-x86_64	2008-07-13 23:51:29.000000000 +0200
+++ b/arch/um/Makefile-x86_64	2008-10-07 11:00:55.000000000 +0200
@@ -21,6 +21,3 @@
 
 LINK-$(CONFIG_LD_SCRIPT_DYN) += -Wl,-rpath,/lib64
 LINK-y += -m64
-
-# Do unit-at-a-time unconditionally on x86_64, following the host
-KBUILD_CFLAGS += $(call cc-option,-funit-at-a-time)
--- a/arch/um/drivers/line.c	2008-10-07 10:31:00.000000000 +0200
+++ b/arch/um/drivers/line.c	2008-10-07 11:00:55.000000000 +0200
@@ -864,6 +864,6 @@
 		return base;
 	}
 
-	snprintf(title, len, "%s (%s)", base, umid);
+	snprintf(title, len, "%s (%s)", umid, base);
 	return title;
 }