[PATCH] vt: rework the console spawning variables

This is such a rare path it took me a while to figure out how to test
this after soring out the locking.

This patch does several things.
- The variables used are moved into a structure and declared in vt_kern.h
- A spinlock is added so we don't have SMP races updating the values.
- Instead of raw pid_t value a struct_pid is used to guard against
  pid wrap around issues, if the daemon to spawn a new console dies.

Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
Cc: Oleg Nesterov <oleg@tv-sign.ru>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 12 insertions, 4 deletions

diff --git a/drivers/char/keyboard.c b/drivers/char/keyboard.c
index 3e90aac37510..99fb070fdbf8 100644
--- a/drivers/char/keyboard.c
+++ b/drivers/char/keyboard.c
@@ -108,7 +108,11 @@ const int NR_TYPES = ARRAY_SIZE(max_vals);
 struct kbd_struct kbd_table[MAX_NR_CONSOLES];
 static struct kbd_struct *kbd = kbd_table;
 
-int spawnpid, spawnsig;
+struct vt_spawn_console vt_spawn_con = {
+        .lock = SPIN_LOCK_UNLOCKED,
+        .pid  = NULL,
+        .sig  = 0,
+};
 
 /*
  * Variables exported for vt.c
@@ -578,9 +582,13 @@ static void fn_compose(struct vc_data *vc, struct pt_regs *regs)
 
 static void fn_spawn_con(struct vc_data *vc, struct pt_regs *regs)
 {
-        if (spawnpid)
-                if (kill_proc(spawnpid, spawnsig, 1))
-                        spawnpid = 0;
+        spin_lock(&vt_spawn_con.lock);
+        if (vt_spawn_con.pid)
+                if (kill_pid(vt_spawn_con.pid, vt_spawn_con.sig, 1)) {
+                        put_pid(vt_spawn_con.pid);
+                        vt_spawn_con.pid = NULL;
+                }
+        spin_unlock(&vt_spawn_con.lock);
 }
 
 static void fn_SAK(struct vc_data *vc, struct pt_regs *regs)