fedora core 6 1.2949 + vserver 2.2.0

[linux-2.6.git] / kernel / vserver / signal.c

diff --git a/kernel/vserver/signal.c b/kernel/vserver/signal.c
index 963cc06..c56c750 100644 (file)
--- a/kernel/vserver/signal.c
+++ b/kernel/vserver/signal.c
@@ -3,13 +3,14 @@
  *
  *  Virtual Server: Signal Support
  *
- *  Copyright (C) 2003-2005  Herbert Pötzl
+ *  Copyright (C) 2003-2007  Herbert Pötzl
  *
  *  V0.01  broken out from vcontext V0.05
+ *  V0.02  changed vcmds to vxi arg
+ *  V0.03  adjusted siginfo for kill
  *
  */
 
-#include <linux/config.h>
 #include <linux/sched.h>
 
 #include <asm/errno.h>
@@ -19,37 +20,28 @@
 #include <linux/vserver/signal_cmd.h>
 
 
-int vc_ctx_kill(uint32_t id, void __user *data)
+int vx_info_kill(struct vx_info *vxi, int pid, int sig)
 {
        int retval, count=0;
-       struct vcmd_ctx_kill_v0 vc_data;
        struct task_struct *p;
-       struct vx_info *vxi;
-       unsigned long priv = 0;
-
-       if (!vx_check(0, VX_ADMIN))
-               return -ENOSYS;
-       if (copy_from_user (&vc_data, data, sizeof(vc_data)))
-               return -EFAULT;
-
-       vxi = locate_vx_info(id);
-       if (!vxi)
-               return -ESRCH;
+       struct siginfo *sip = SEND_SIG_PRIV;
 
        retval = -ESRCH;
+       vxdprintk(VXD_CBIT(misc, 4),
+               "vx_info_kill(%p[#%d],%d,%d)*",
+               vxi, vxi->vx_id, pid, sig);
        read_lock(&tasklist_lock);
-       switch (vc_data.pid) {
+       switch (pid) {
        case  0:
-               priv = 1;
        case -1:
                for_each_process(p) {
                        int err = 0;
 
-                       if (vx_task_xid(p) != id || p->pid <= 1 ||
-                               (vc_data.pid && vxi->vx_initpid == p->pid))
+                       if (vx_task_xid(p) != vxi->vx_id || p->pid <= 1 ||
+                               (pid && vxi->vx_initpid == p->pid))
                                continue;
 
-                       err = group_send_sig_info(vc_data.sig, (void*)priv, p);
+                       err = group_send_sig_info(sig, sip, p);
                        ++count;
                        if (err != -EPERM)
                                retval = err;
@@ -58,24 +50,46 @@ int vc_ctx_kill(uint32_t id, void __user *data)
 
        case 1:
                if (vxi->vx_initpid) {
-                       vc_data.pid = vxi->vx_initpid;
-                       priv = 1;
+                       pid = vxi->vx_initpid;
+                       /* for now, only SIGINT to private init ... */
+                       if (!vx_info_flags(vxi, VXF_STATE_ADMIN, 0) &&
+                               /* ... as long as there are tasks left */
+                               (atomic_read(&vxi->vx_tasks) > 1))
+                               sig = SIGINT;
                }
                /* fallthrough */
        default:
-               p = find_task_by_real_pid(vc_data.pid);
+               p = find_task_by_real_pid(pid);
                if (p) {
-                       if ((id == -1) || (vx_task_xid(p) == id))
-                               retval = group_send_sig_info(vc_data.sig,
-                                       (void*)priv, p);
+                       if (vx_task_xid(p) == vxi->vx_id)
+                               retval = group_send_sig_info(sig, sip, p);
                }
                break;
        }
        read_unlock(&tasklist_lock);
-       put_vx_info(vxi);
+       vxdprintk(VXD_CBIT(misc, 4),
+               "vx_info_kill(%p[#%d],%d,%d,%ld) = %d",
+               vxi, vxi->vx_id, pid, sig, (long)sip, retval);
        return retval;
 }
 
+int vc_ctx_kill(struct vx_info *vxi, void __user *data)
+{
+       struct vcmd_ctx_kill_v0 vc_data;
+
+       if (copy_from_user (&vc_data, data, sizeof(vc_data)))
+               return -EFAULT;
+
+       /* special check to allow guest shutdown */
+       if (!vx_info_flags(vxi, VXF_STATE_ADMIN, 0) &&
+               /* forbid killall pid=0 when init is present */
+               (((vc_data.pid < 1) && vxi->vx_initpid) ||
+               (vc_data.pid > 1)))
+               return -EACCES;
+
+       return vx_info_kill(vxi, vc_data.pid, vc_data.sig);
+}
+
 
 static int __wait_exit(struct vx_info *vxi)
 {
@@ -86,7 +100,8 @@ static int __wait_exit(struct vx_info *vxi)
        set_current_state(TASK_INTERRUPTIBLE);
 
 wait:
-       if (vx_info_state(vxi, VXS_SHUTDOWN|VXS_HASHED) == VXS_SHUTDOWN)
+       if (vx_info_state(vxi,
+               VXS_SHUTDOWN|VXS_HASHED|VXS_HELPER) == VXS_SHUTDOWN)
                goto out;
        if (signal_pending(current)) {
                ret = -ERESTARTSYS;
@@ -103,17 +118,17 @@ out:
 
 
 
-int vc_wait_exit(uint32_t id, void __user *data)
+int vc_wait_exit(struct vx_info *vxi, void __user *data)
 {
-       struct vx_info *vxi;
+       struct vcmd_wait_exit_v0 vc_data;
        int ret;
 
-       vxi = locate_vx_info(id);
-       if (!vxi)
-               return -ESRCH;
-
        ret = __wait_exit(vxi);
-       put_vx_info(vxi);
+       vc_data.reboot_cmd = vxi->reboot_cmd;
+       vc_data.exit_code = vxi->exit_code;
+
+       if (copy_to_user (data, &vc_data, sizeof(vc_data)))
+               ret = -EFAULT;
        return ret;
 }