usermodehelper: export call_usermodehelper_exec() and call_usermodehelper_setup()

call_usermodehelper_setup() + call_usermodehelper_exec() need to be
called instead of call_usermodehelper_fns() when the cleanup function
needs to be called even when an ENOMEM error occurs.  In this case using
call_usermodehelper_fns() the user can't distinguish if the cleanup
function was called or not.

[akpm@linux-foundation.org: export call_usermodehelper_setup() to modules]
Signed-off-by: Lucas De Marchi <lucas.demarchi@profusion.mobi>
Reviewed-by: Oleg Nesterov <oleg@redhat.com>
Cc: David Howells <dhowells@redhat.com>
Cc: James Morris <james.l.morris@oracle.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Tejun Heo <tj@kernel.org>
Cc: "Rafael J. Wysocki" <rjw@sisk.pl>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

2 files changed, 32 insertions, 33 deletions

diff --git a/include/linux/kmod.h b/include/linux/kmod.h
index 5398d5807075..7eebcf5d75f1 100644
--- a/include/linux/kmod.h
+++ b/include/linux/kmod.h
@@ -71,6 +71,14 @@ call_usermodehelper_fns(char *path, char **argv, char **envp, int wait,
                         int (*init)(struct subprocess_info *info, struct cred *new),
                         void (*cleanup)(struct subprocess_info *), void *data);
 
+extern struct subprocess_info *
+call_usermodehelper_setup(char *path, char **argv, char **envp, gfp_t gfp_mask,
+                          int (*init)(struct subprocess_info *info, struct cred *new),
+                          void (*cleanup)(struct subprocess_info *), void *data);
+
+extern int
+call_usermodehelper_exec(struct subprocess_info *info, int wait);
+
 static inline int
 call_usermodehelper(char *path, char **argv, char **envp, int wait)
 {
diff --git a/kernel/kmod.c b/kernel/kmod.c
index 56dd34976d7b..e11ea14ac011 100644
--- a/kernel/kmod.c
+++ b/kernel/kmod.c
@@ -502,14 +502,28 @@ static void helper_unlock(void)
  * @argv: arg vector for process
  * @envp: environment for process
  * @gfp_mask: gfp mask for memory allocation
+ * @cleanup: a cleanup function
+ * @init: an init function
+ * @data: arbitrary context sensitive data
  *
  * Returns either %NULL on allocation failure, or a subprocess_info
  * structure.  This should be passed to call_usermodehelper_exec to
  * exec the process and free the structure.
+ *
+ * The init function is used to customize the helper process prior to
+ * exec.  A non-zero return code causes the process to error out, exit,
+ * and return the failure to the calling process
+ *
+ * The cleanup function is just before ethe subprocess_info is about to
+ * be freed.  This can be used for freeing the argv and envp.  The
+ * Function must be runnable in either a process context or the
+ * context in which call_usermodehelper_exec is called.
  */
-static
 struct subprocess_info *call_usermodehelper_setup(char *path, char **argv,
-                                                  char **envp, gfp_t gfp_mask)
+                char **envp, gfp_t gfp_mask,
+                int (*init)(struct subprocess_info *info, struct cred *new),
+                void (*cleanup)(struct subprocess_info *info),
+                void *data)
 {
         struct subprocess_info *sub_info;
         sub_info = kzalloc(sizeof(struct subprocess_info), gfp_mask);
@@ -520,36 +534,14 @@ struct subprocess_info *call_usermodehelper_setup(char *path, char **argv,
         sub_info->path = path;
         sub_info->argv = argv;
         sub_info->envp = envp;
+
+        sub_info->cleanup = cleanup;
+        sub_info->init = init;
+        sub_info->data = data;
   out:
         return sub_info;
 }
-
-/**
- * call_usermodehelper_setfns - set a cleanup/init function
- * @info: a subprocess_info returned by call_usermodehelper_setup
- * @cleanup: a cleanup function
- * @init: an init function
- * @data: arbitrary context sensitive data
- *
- * The init function is used to customize the helper process prior to
- * exec.  A non-zero return code causes the process to error out, exit,
- * and return the failure to the calling process
- *
- * The cleanup function is just before ethe subprocess_info is about to
- * be freed.  This can be used for freeing the argv and envp.  The
- * Function must be runnable in either a process context or the
- * context in which call_usermodehelper_exec is called.
- */
-static
-void call_usermodehelper_setfns(struct subprocess_info *info,
-                    int (*init)(struct subprocess_info *info, struct cred *new),
-                    void (*cleanup)(struct subprocess_info *info),
-                    void *data)
-{
-        info->cleanup = cleanup;
-        info->init = init;
-        info->data = data;
-}
+EXPORT_SYMBOL(call_usermodehelper_setup);
 
 /**
  * call_usermodehelper_exec - start a usermode application
@@ -563,7 +555,6 @@ void call_usermodehelper_setfns(struct subprocess_info *info,
  * asynchronously if wait is not set, and runs as a child of keventd.
  * (ie. it runs with full root capabilities).
  */
-static
 int call_usermodehelper_exec(struct subprocess_info *sub_info, int wait)
 {
         DECLARE_COMPLETION_ONSTACK(done);
@@ -615,6 +606,7 @@ unlock:
         helper_unlock();
         return retval;
 }
+EXPORT_SYMBOL(call_usermodehelper_exec);
 
 /*
  * call_usermodehelper_fns() will not run the caller-provided cleanup function
@@ -630,13 +622,12 @@ int call_usermodehelper_fns(
         struct subprocess_info *info;
         gfp_t gfp_mask = (wait == UMH_NO_WAIT) ? GFP_ATOMIC : GFP_KERNEL;
 
-        info = call_usermodehelper_setup(path, argv, envp, gfp_mask);
+        info = call_usermodehelper_setup(path, argv, envp, gfp_mask,
+                                         init, cleanup, data);
 
         if (info == NULL)
                 return -ENOMEM;
 
-        call_usermodehelper_setfns(info, init, cleanup, data);
-
         return call_usermodehelper_exec(info, wait);
 }
 EXPORT_SYMBOL(call_usermodehelper_fns);