ported mconsole-exec patch to 2.6.27-rc7
authorMartin Willi <martin@strongswan.org>
Tue, 7 Oct 2008 09:09:34 +0000 (09:09 -0000)
committerMartin Willi <martin@strongswan.org>
Tue, 7 Oct 2008 09:09:34 +0000 (09:09 -0000)
src/dumm/patches/mconsole-exec-2.6.27.patch [new file with mode: 0644]

diff --git a/src/dumm/patches/mconsole-exec-2.6.27.patch b/src/dumm/patches/mconsole-exec-2.6.27.patch
new file mode 100644 (file)
index 0000000..b0405ee
--- /dev/null
@@ -0,0 +1,335 @@
+--- 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;
+ }