[PATCH] Keys: Pass session keyring to call_usermodehelper()
[linux-2.6.git] / kernel / kmod.c
index eed53d4f5230571b6bba0597bf24d8edeef4dc27..44166e3bb8afab469a61575946b46da45e215cc7 100644 (file)
@@ -120,6 +120,7 @@ struct subprocess_info {
        char *path;
        char **argv;
        char **envp;
+       struct key *ring;
        int wait;
        int retval;
 };
@@ -130,16 +131,21 @@ struct subprocess_info {
 static int ____call_usermodehelper(void *data)
 {
        struct subprocess_info *sub_info = data;
+       struct key *old_session;
        int retval;
 
-       /* Unblock all signals. */
+       /* Unblock all signals and set the session keyring. */
+       key_get(sub_info->ring);
        flush_signals(current);
        spin_lock_irq(&current->sighand->siglock);
+       old_session = __install_session_keyring(current, sub_info->ring);
        flush_signal_handlers(current, 1);
        sigemptyset(&current->blocked);
        recalc_sigpending();
        spin_unlock_irq(&current->sighand->siglock);
 
+       key_put(old_session);
+
        /* We can run anywhere, unlike our parent keventd(). */
        set_cpus_allowed(current, CPU_MASK_ALL);
 
@@ -211,10 +217,11 @@ static void __call_usermodehelper(void *data)
 }
 
 /**
- * call_usermodehelper - start a usermode application
+ * call_usermodehelper_keys - start a usermode application
  * @path: pathname for the application
  * @argv: null-terminated argument list
  * @envp: null-terminated environment list
+ * @session_keyring: session keyring for process (NULL for an empty keyring)
  * @wait: wait for the application to finish and return status.
  *
  * Runs a user-space application.  The application is started
@@ -224,7 +231,8 @@ static void __call_usermodehelper(void *data)
  * Must be called from process context.  Returns a negative error code
  * if program was not execed successfully, or 0.
  */
-int call_usermodehelper(char *path, char **argv, char **envp, int wait)
+int call_usermodehelper_keys(char *path, char **argv, char **envp,
+                            struct key *session_keyring, int wait)
 {
        DECLARE_COMPLETION(done);
        struct subprocess_info sub_info = {
@@ -232,6 +240,7 @@ int call_usermodehelper(char *path, char **argv, char **envp, int wait)
                .path           = path,
                .argv           = argv,
                .envp           = envp,
+               .ring           = session_keyring,
                .wait           = wait,
                .retval         = 0,
        };
@@ -247,7 +256,7 @@ int call_usermodehelper(char *path, char **argv, char **envp, int wait)
        wait_for_completion(&done);
        return sub_info.retval;
 }
-EXPORT_SYMBOL(call_usermodehelper);
+EXPORT_SYMBOL(call_usermodehelper_keys);
 
 void __init usermodehelper_init(void)
 {