#include <linux/init.h>
#include <linux/highuid.h>
#include <linux/fs.h>
+#include <linux/kernel.h>
+#include <linux/kexec.h>
#include <linux/workqueue.h>
#include <linux/device.h>
#include <linux/key.h>
#include <linux/dcookies.h>
#include <linux/suspend.h>
#include <linux/tty.h>
+#include <linux/signal.h>
#include <linux/compat.h>
#include <linux/syscalls.h>
error = -EPERM;
goto out;
}
- if (niceval < task_nice(p) && !capable(CAP_SYS_NICE)) {
+ if (niceval < task_nice(p) && !can_nice(p, niceval)) {
error = -EACCES;
goto out;
}
case LINUX_REBOOT_CMD_HALT:
notifier_call_chain(&reboot_notifier_list, SYS_HALT, NULL);
system_state = SYSTEM_HALT;
+ device_suspend(PMSG_SUSPEND);
device_shutdown();
printk(KERN_EMERG "System halted.\n");
machine_halt();
case LINUX_REBOOT_CMD_POWER_OFF:
notifier_call_chain(&reboot_notifier_list, SYS_POWER_OFF, NULL);
system_state = SYSTEM_POWER_OFF;
+ device_suspend(PMSG_SUSPEND);
device_shutdown();
printk(KERN_EMERG "Power down.\n");
machine_power_off();
notifier_call_chain(&reboot_notifier_list, SYS_RESTART, buffer);
system_state = SYSTEM_RESTART;
+ device_suspend(PMSG_FREEZE);
device_shutdown();
printk(KERN_EMERG "Restarting system with command '%s'.\n", buffer);
machine_restart(buffer);
break;
+#ifdef CONFIG_KEXEC
+ case LINUX_REBOOT_CMD_KEXEC:
+ {
+ struct kimage *image;
+ image = xchg(&kexec_image, 0);
+ if (!image) {
+ unlock_kernel();
+ return -EINVAL;
+ }
+ notifier_call_chain(&reboot_notifier_list, SYS_RESTART, NULL);
+ system_state = SYSTEM_RESTART;
+ device_shutdown();
+ printk(KERN_EMERG "Starting new kernel\n");
+ machine_shutdown();
+ machine_kexec(image);
+ break;
+ }
+#endif
#ifdef CONFIG_SOFTWARE_SUSPEND
case LINUX_REBOOT_CMD_SW_SUSPEND:
{
}
if (new_egid != old_egid)
{
- current->mm->dumpable = 0;
- wmb();
+ current->mm->dumpable = suid_dumpable;
+ smp_wmb();
}
if (rgid != (gid_t) -1 ||
(egid != (gid_t) -1 && egid != old_rgid))
{
if(old_egid != gid)
{
- current->mm->dumpable=0;
- wmb();
+ current->mm->dumpable = suid_dumpable;
+ smp_wmb();
}
current->gid = current->egid = current->sgid = current->fsgid = gid;
}
{
if(old_egid != gid)
{
- current->mm->dumpable=0;
- wmb();
+ current->mm->dumpable = suid_dumpable;
+ smp_wmb();
}
current->egid = current->fsgid = gid;
}
if(dumpclear)
{
- current->mm->dumpable = 0;
- wmb();
+ current->mm->dumpable = suid_dumpable;
+ smp_wmb();
}
current->uid = new_ruid;
return 0;
if (new_euid != old_euid)
{
- current->mm->dumpable=0;
- wmb();
+ current->mm->dumpable = suid_dumpable;
+ smp_wmb();
}
current->fsuid = current->euid = new_euid;
if (ruid != (uid_t) -1 ||
if (old_euid != uid)
{
- current->mm->dumpable = 0;
- wmb();
+ current->mm->dumpable = suid_dumpable;
+ smp_wmb();
}
current->fsuid = current->euid = uid;
current->suid = new_suid;
if (euid != (uid_t) -1) {
if (euid != current->euid)
{
- current->mm->dumpable = 0;
- wmb();
+ current->mm->dumpable = suid_dumpable;
+ smp_wmb();
}
current->euid = euid;
}
if (egid != (gid_t) -1) {
if (egid != current->egid)
{
- current->mm->dumpable = 0;
- wmb();
+ current->mm->dumpable = suid_dumpable;
+ smp_wmb();
}
current->egid = egid;
}
{
if (uid != old_fsuid)
{
- current->mm->dumpable = 0;
- wmb();
+ current->mm->dumpable = suid_dumpable;
+ smp_wmb();
}
current->fsuid = uid;
}
{
if (gid != old_fsgid)
{
- current->mm->dumpable = 0;
- wmb();
+ current->mm->dumpable = suid_dumpable;
+ smp_wmb();
}
current->fsgid = gid;
key_fsgid_changed(current);
*/
if (tbuf) {
struct tms tmp;
- struct task_struct *tsk = current;
- struct task_struct *t;
cputime_t utime, stime, cutime, cstime;
- read_lock(&tasklist_lock);
- utime = tsk->signal->utime;
- stime = tsk->signal->stime;
- t = tsk;
- do {
- utime = cputime_add(utime, t->utime);
- stime = cputime_add(stime, t->stime);
- t = next_thread(t);
- } while (t != tsk);
-
- /*
- * While we have tasklist_lock read-locked, no dying thread
- * can be updating current->signal->[us]time. Instead,
- * we got their counts included in the live thread loop.
- * However, another thread can come in right now and
- * do a wait call that updates current->signal->c[us]time.
- * To make sure we always see that pair updated atomically,
- * we take the siglock around fetching them.
- */
- spin_lock_irq(&tsk->sighand->siglock);
- cutime = tsk->signal->cutime;
- cstime = tsk->signal->cstime;
- spin_unlock_irq(&tsk->sighand->siglock);
- read_unlock(&tasklist_lock);
+#ifdef CONFIG_SMP
+ if (thread_group_empty(current)) {
+ /*
+ * Single thread case without the use of any locks.
+ *
+ * We may race with release_task if two threads are
+ * executing. However, release task first adds up the
+ * counters (__exit_signal) before removing the task
+ * from the process tasklist (__unhash_process).
+ * __exit_signal also acquires and releases the
+ * siglock which results in the proper memory ordering
+ * so that the list modifications are always visible
+ * after the counters have been updated.
+ *
+ * If the counters have been updated by the second thread
+ * but the thread has not yet been removed from the list
+ * then the other branch will be executing which will
+ * block on tasklist_lock until the exit handling of the
+ * other task is finished.
+ *
+ * This also implies that the sighand->siglock cannot
+ * be held by another processor. So we can also
+ * skip acquiring that lock.
+ */
+ utime = cputime_add(current->signal->utime, current->utime);
+ stime = cputime_add(current->signal->utime, current->stime);
+ cutime = current->signal->cutime;
+ cstime = current->signal->cstime;
+ } else
+#endif
+ {
+ /* Process with multiple threads */
+ struct task_struct *tsk = current;
+ struct task_struct *t;
+
+ read_lock(&tasklist_lock);
+ utime = tsk->signal->utime;
+ stime = tsk->signal->stime;
+ t = tsk;
+ do {
+ utime = cputime_add(utime, t->utime);
+ stime = cputime_add(stime, t->stime);
+ t = next_thread(t);
+ } while (t != tsk);
+
+ /*
+ * While we have tasklist_lock read-locked, no dying thread
+ * can be updating current->signal->[us]time. Instead,
+ * we got their counts included in the live thread loop.
+ * However, another thread can come in right now and
+ * do a wait call that updates current->signal->c[us]time.
+ * To make sure we always see that pair updated atomically,
+ * we take the siglock around fetching them.
+ */
+ spin_lock_irq(&tsk->sighand->siglock);
+ cutime = tsk->signal->cutime;
+ cstime = tsk->signal->cstime;
+ spin_unlock_irq(&tsk->sighand->siglock);
+ read_unlock(&tasklist_lock);
+ }
tmp.tms_utime = cputime_to_clock_t(utime);
tmp.tms_stime = cputime_to_clock_t(stime);
tmp.tms_cutime = cputime_to_clock_t(cutime);
return 0;
}
-/* a simple shell-metzner sort */
+/* a simple Shell sort */
static void groups_sort(struct group_info *group_info)
{
int base, max, stride;
}
/* a simple bsearch */
-static int groups_search(struct group_info *group_info, gid_t grp)
+int groups_search(struct group_info *group_info, gid_t grp)
{
int left, right;
switch (option) {
case PR_SET_PDEATHSIG:
sig = arg2;
- if (sig < 0 || sig > _NSIG) {
+ if (!valid_signal(sig)) {
error = -EINVAL;
break;
}
error = 1;
break;
case PR_SET_DUMPABLE:
- if (arg2 != 0 && arg2 != 1) {
+ if (arg2 < 0 || arg2 > 2) {
error = -EINVAL;
break;
}
projects / linux-2.6 / blobdiff