Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jbarnes...

[pandora-kernel.git] / kernel / sys.c

diff --git a/kernel/sys.c b/kernel/sys.c
index af468ed..dd948a1 100644 (file)
--- a/kernel/sys.c
+++ b/kernel/sys.c
@@ -8,7 +8,6 @@
 #include <linux/mm.h>
 #include <linux/utsname.h>
 #include <linux/mman.h>
-#include <linux/notifier.h>
 #include <linux/reboot.h>
 #include <linux/prctl.h>
 #include <linux/highuid.h>
@@ -314,11 +313,42 @@ void kernel_restart_prepare(char *cmd)
 {
        blocking_notifier_call_chain(&reboot_notifier_list, SYS_RESTART, cmd);
        system_state = SYSTEM_RESTART;
+       usermodehelper_disable();
        device_shutdown();
-       sysdev_shutdown();
        syscore_shutdown();
 }
 
+/**
+ *     register_reboot_notifier - Register function to be called at reboot time
+ *     @nb: Info about notifier function to be called
+ *
+ *     Registers a function with the list of functions
+ *     to be called at reboot time.
+ *
+ *     Currently always returns zero, as blocking_notifier_chain_register()
+ *     always returns zero.
+ */
+int register_reboot_notifier(struct notifier_block *nb)
+{
+       return blocking_notifier_chain_register(&reboot_notifier_list, nb);
+}
+EXPORT_SYMBOL(register_reboot_notifier);
+
+/**
+ *     unregister_reboot_notifier - Unregister previously registered reboot notifier
+ *     @nb: Hook to be unregistered
+ *
+ *     Unregisters a previously registered reboot
+ *     notifier function.
+ *
+ *     Returns zero on success, or %-ENOENT on failure.
+ */
+int unregister_reboot_notifier(struct notifier_block *nb)
+{
+       return blocking_notifier_chain_unregister(&reboot_notifier_list, nb);
+}
+EXPORT_SYMBOL(unregister_reboot_notifier);
+
 /**
  *     kernel_restart - reboot the system
  *     @cmd: pointer to buffer containing command to execute for restart
@@ -344,6 +374,7 @@ static void kernel_shutdown_prepare(enum system_states state)
        blocking_notifier_call_chain(&reboot_notifier_list,
                (state == SYSTEM_HALT)?SYS_HALT:SYS_POWER_OFF, NULL);
        system_state = state;
+       usermodehelper_disable();
        device_shutdown();
 }
 /**
@@ -354,7 +385,6 @@ static void kernel_shutdown_prepare(enum system_states state)
 void kernel_halt(void)
 {
        kernel_shutdown_prepare(SYSTEM_HALT);
-       sysdev_shutdown();
        syscore_shutdown();
        printk(KERN_EMERG "System halted.\n");
        kmsg_dump(KMSG_DUMP_HALT);
@@ -374,7 +404,6 @@ void kernel_power_off(void)
        if (pm_power_off_prepare)
                pm_power_off_prepare();
        disable_nonboot_cpus();
-       sysdev_shutdown();
        syscore_shutdown();
        printk(KERN_EMERG "Power down.\n");
        kmsg_dump(KMSG_DUMP_POWEROFF);
@@ -592,11 +621,18 @@ static int set_user(struct cred *new)
        if (!new_user)
                return -EAGAIN;
 
+       /*
+        * We don't fail in case of NPROC limit excess here because too many
+        * poorly written programs don't check set*uid() return code, assuming
+        * it never fails if called by root.  We may still enforce NPROC limit
+        * for programs doing set*uid()+execve() by harmlessly deferring the
+        * failure to the execve() stage.
+        */
        if (atomic_read(&new_user->processes) >= rlimit(RLIMIT_NPROC) &&
-                       new_user != INIT_USER) {
-               free_uid(new_user);
-               return -EAGAIN;
-       }
+                       new_user != INIT_USER)
+               current->flags |= PF_NPROC_EXCEEDED;
+       else
+               current->flags &= ~PF_NPROC_EXCEEDED;
 
        free_uid(new->user);
        new->user = new_user;