#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/capability.h>
#include <linux/device.h>
#include <linux/key.h>
#include <linux/times.h>
#include <linux/suspend.h>
#include <linux/tty.h>
#include <linux/signal.h>
+#include <linux/cn_proc.h>
#include <linux/compat.h>
#include <linux/syscalls.h>
+#include <linux/kprobes.h>
#include <asm/uaccess.h>
#include <asm/io.h>
* of the last notifier function called.
*/
-int notifier_call_chain(struct notifier_block **n, unsigned long val, void *v)
+int __kprobes notifier_call_chain(struct notifier_block **n, unsigned long val, void *v)
{
int ret=NOTIFY_DONE;
struct notifier_block *nb = *n;
return retval;
}
+/**
+ * emergency_restart - reboot the system
+ *
+ * Without shutting down any hardware or taking any locks
+ * reboot the system. This is called when we know we are in
+ * trouble so this is our best effort to reboot. This is
+ * safe to call in interrupt context.
+ */
+void emergency_restart(void)
+{
+ machine_emergency_restart();
+}
+EXPORT_SYMBOL_GPL(emergency_restart);
+
+void kernel_restart_prepare(char *cmd)
+{
+ notifier_call_chain(&reboot_notifier_list, SYS_RESTART, cmd);
+ system_state = SYSTEM_RESTART;
+ device_shutdown();
+}
+
+/**
+ * kernel_restart - reboot the system
+ * @cmd: pointer to buffer containing command to execute for restart
+ * or %NULL
+ *
+ * Shutdown everything and perform a clean reboot.
+ * This is not safe to call in interrupt context.
+ */
+void kernel_restart(char *cmd)
+{
+ kernel_restart_prepare(cmd);
+ if (!cmd) {
+ printk(KERN_EMERG "Restarting system.\n");
+ } else {
+ printk(KERN_EMERG "Restarting system with command '%s'.\n", cmd);
+ }
+ printk(".\n");
+ machine_restart(cmd);
+}
+EXPORT_SYMBOL_GPL(kernel_restart);
+/**
+ * kernel_kexec - reboot the system
+ *
+ * Move into place and start executing a preloaded standalone
+ * executable. If nothing was preloaded return an error.
+ */
+void kernel_kexec(void)
+{
+#ifdef CONFIG_KEXEC
+ struct kimage *image;
+ image = xchg(&kexec_image, NULL);
+ if (!image) {
+ return;
+ }
+ kernel_restart_prepare(NULL);
+ printk(KERN_EMERG "Starting new kernel\n");
+ machine_shutdown();
+ machine_kexec(image);
+#endif
+}
+EXPORT_SYMBOL_GPL(kernel_kexec);
+
+void kernel_shutdown_prepare(enum system_states state)
+{
+ notifier_call_chain(&reboot_notifier_list,
+ (state == SYSTEM_HALT)?SYS_HALT:SYS_POWER_OFF, NULL);
+ system_state = state;
+ device_shutdown();
+}
+/**
+ * kernel_halt - halt the system
+ *
+ * Shutdown everything and perform a clean system halt.
+ */
+void kernel_halt(void)
+{
+ kernel_shutdown_prepare(SYSTEM_HALT);
+ printk(KERN_EMERG "System halted.\n");
+ machine_halt();
+}
+
+EXPORT_SYMBOL_GPL(kernel_halt);
+
+/**
+ * kernel_power_off - power_off the system
+ *
+ * Shutdown everything and perform a clean system power_off.
+ */
+void kernel_power_off(void)
+{
+ kernel_shutdown_prepare(SYSTEM_POWER_OFF);
+ printk(KERN_EMERG "Power down.\n");
+ machine_power_off();
+}
+EXPORT_SYMBOL_GPL(kernel_power_off);
/*
* Reboot system call: for obvious reasons only root may call it,
* and even root needs to set up some magic numbers in the registers
magic2 != LINUX_REBOOT_MAGIC2C))
return -EINVAL;
+ /* Instead of trying to make the power_off code look like
+ * halt when pm_power_off is not set do it the easy way.
+ */
+ if ((cmd == LINUX_REBOOT_CMD_POWER_OFF) && !pm_power_off)
+ cmd = LINUX_REBOOT_CMD_HALT;
+
lock_kernel();
switch (cmd) {
case LINUX_REBOOT_CMD_RESTART:
- notifier_call_chain(&reboot_notifier_list, SYS_RESTART, NULL);
- system_state = SYSTEM_RESTART;
- device_shutdown();
- printk(KERN_EMERG "Restarting system.\n");
- machine_restart(NULL);
+ kernel_restart(NULL);
break;
case LINUX_REBOOT_CMD_CAD_ON:
break;
case LINUX_REBOOT_CMD_HALT:
- notifier_call_chain(&reboot_notifier_list, SYS_HALT, NULL);
- system_state = SYSTEM_HALT;
- device_shutdown();
- printk(KERN_EMERG "System halted.\n");
- machine_halt();
+ kernel_halt();
unlock_kernel();
do_exit(0);
break;
case LINUX_REBOOT_CMD_POWER_OFF:
- notifier_call_chain(&reboot_notifier_list, SYS_POWER_OFF, NULL);
- system_state = SYSTEM_POWER_OFF;
- device_shutdown();
- printk(KERN_EMERG "Power down.\n");
- machine_power_off();
+ kernel_power_off();
unlock_kernel();
do_exit(0);
break;
}
buffer[sizeof(buffer) - 1] = '\0';
- notifier_call_chain(&reboot_notifier_list, SYS_RESTART, buffer);
- system_state = SYSTEM_RESTART;
- device_shutdown();
- printk(KERN_EMERG "Restarting system with command '%s'.\n", buffer);
- machine_restart(buffer);
+ kernel_restart(buffer);
break;
+ case LINUX_REBOOT_CMD_KEXEC:
+ kernel_kexec();
+ unlock_kernel();
+ return -EINVAL;
+
#ifdef CONFIG_SOFTWARE_SUSPEND
case LINUX_REBOOT_CMD_SW_SUSPEND:
{
static void deferred_cad(void *dummy)
{
- notifier_call_chain(&reboot_notifier_list, SYS_RESTART, NULL);
- machine_restart(NULL);
+ kernel_restart(NULL);
}
/*
current->egid = new_egid;
current->gid = new_rgid;
key_fsgid_changed(current);
+ proc_id_connector(current, PROC_EVENT_GID);
return 0;
}
return -EPERM;
key_fsgid_changed(current);
+ proc_id_connector(current, PROC_EVENT_GID);
return 0;
}
current->fsuid = current->euid;
key_fsuid_changed(current);
+ proc_id_connector(current, PROC_EVENT_UID);
return security_task_post_setuid(old_ruid, old_euid, old_suid, LSM_SETID_RE);
}
current->suid = new_suid;
key_fsuid_changed(current);
+ proc_id_connector(current, PROC_EVENT_UID);
return security_task_post_setuid(old_ruid, old_euid, old_suid, LSM_SETID_ID);
}
current->suid = suid;
key_fsuid_changed(current);
+ proc_id_connector(current, PROC_EVENT_UID);
return security_task_post_setuid(old_ruid, old_euid, old_suid, LSM_SETID_RES);
}
current->sgid = sgid;
key_fsgid_changed(current);
+ proc_id_connector(current, PROC_EVENT_GID);
return 0;
}
}
key_fsuid_changed(current);
+ proc_id_connector(current, PROC_EVENT_UID);
security_task_post_setuid(old_fsuid, (uid_t)-1, (uid_t)-1, LSM_SETID_FS);
}
current->fsgid = gid;
key_fsgid_changed(current);
+ proc_id_connector(current, PROC_EVENT_GID);
}
return old_fsgid;
}
asmlinkage long sys_setpgid(pid_t pid, pid_t pgid)
{
struct task_struct *p;
+ struct task_struct *group_leader = current->group_leader;
int err = -EINVAL;
if (!pid)
- pid = current->pid;
+ pid = group_leader->pid;
if (!pgid)
pgid = pid;
if (pgid < 0)
if (!thread_group_leader(p))
goto out;
- if (p->parent == current || p->real_parent == current) {
+ if (p->real_parent == group_leader) {
err = -EPERM;
- if (p->signal->session != current->signal->session)
+ if (p->signal->session != group_leader->signal->session)
goto out;
err = -EACCES;
if (p->did_exec)
goto out;
} else {
err = -ESRCH;
- if (p != current)
+ if (p != group_leader)
goto out;
}
struct task_struct *p;
do_each_task_pid(pgid, PIDTYPE_PGID, p) {
- if (p->signal->session == current->signal->session)
+ if (p->signal->session == group_leader->signal->session)
goto ok_pgid;
} while_each_task_pid(pgid, PIDTYPE_PGID, p);
goto out;
asmlinkage long sys_setsid(void)
{
+ struct task_struct *group_leader = current->group_leader;
struct pid *pid;
int err = -EPERM;
- if (!thread_group_leader(current))
- return -EINVAL;
-
- down(&tty_sem);
+ mutex_lock(&tty_mutex);
write_lock_irq(&tasklist_lock);
- pid = find_pid(PIDTYPE_PGID, current->pid);
+ pid = find_pid(PIDTYPE_PGID, group_leader->pid);
if (pid)
goto out;
- current->signal->leader = 1;
- __set_special_pids(current->pid, current->pid);
- current->signal->tty = NULL;
- current->signal->tty_old_pgrp = 0;
- err = process_group(current);
+ group_leader->signal->leader = 1;
+ __set_special_pids(group_leader->pid, group_leader->pid);
+ group_leader->signal->tty = NULL;
+ group_leader->signal->tty_old_pgrp = 0;
+ err = process_group(group_leader);
out:
write_unlock_irq(&tasklist_lock);
- up(&tty_sem);
+ mutex_unlock(&tty_mutex);
return err;
}
asmlinkage long sys_setrlimit(unsigned int resource, struct rlimit __user *rlim)
{
struct rlimit new_rlim, *old_rlim;
+ unsigned long it_prof_secs;
int retval;
if (resource >= RLIM_NLIMITS)
return -EINVAL;
- if(copy_from_user(&new_rlim, rlim, sizeof(*rlim)))
+ if (copy_from_user(&new_rlim, rlim, sizeof(*rlim)))
return -EFAULT;
- if (new_rlim.rlim_cur > new_rlim.rlim_max)
- return -EINVAL;
+ if (new_rlim.rlim_cur > new_rlim.rlim_max)
+ return -EINVAL;
old_rlim = current->signal->rlim + resource;
if ((new_rlim.rlim_max > old_rlim->rlim_max) &&
!capable(CAP_SYS_RESOURCE))
return -EPERM;
if (resource == RLIMIT_NOFILE && new_rlim.rlim_max > NR_OPEN)
- return -EPERM;
+ return -EPERM;
retval = security_task_setrlimit(resource, &new_rlim);
if (retval)
*old_rlim = new_rlim;
task_unlock(current->group_leader);
- if (resource == RLIMIT_CPU && new_rlim.rlim_cur != RLIM_INFINITY &&
- (cputime_eq(current->signal->it_prof_expires, cputime_zero) ||
- new_rlim.rlim_cur <= cputime_to_secs(
- current->signal->it_prof_expires))) {
- cputime_t cputime = secs_to_cputime(new_rlim.rlim_cur);
+ if (resource != RLIMIT_CPU)
+ goto out;
+
+ /*
+ * RLIMIT_CPU handling. Note that the kernel fails to return an error
+ * code if it rejected the user's attempt to set RLIMIT_CPU. This is a
+ * very long-standing error, and fixing it now risks breakage of
+ * applications, so we live with it
+ */
+ if (new_rlim.rlim_cur == RLIM_INFINITY)
+ goto out;
+
+ it_prof_secs = cputime_to_secs(current->signal->it_prof_expires);
+ if (it_prof_secs == 0 || new_rlim.rlim_cur <= it_prof_secs) {
+ unsigned long rlim_cur = new_rlim.rlim_cur;
+ cputime_t cputime;
+
+ if (rlim_cur == 0) {
+ /*
+ * The caller is asking for an immediate RLIMIT_CPU
+ * expiry. But we use the zero value to mean "it was
+ * never set". So let's cheat and make it one second
+ * instead
+ */
+ rlim_cur = 1;
+ }
+ cputime = secs_to_cputime(rlim_cur);
read_lock(&tasklist_lock);
spin_lock_irq(¤t->sighand->siglock);
- set_process_cpu_timer(current, CPUCLOCK_PROF,
- &cputime, NULL);
+ set_process_cpu_timer(current, CPUCLOCK_PROF, &cputime, NULL);
spin_unlock_irq(¤t->sighand->siglock);
read_unlock(&tasklist_lock);
}
-
+out:
return 0;
}
* a lot simpler! (Which we're not doing right now because we're not
* measuring them yet).
*
- * This expects to be called with tasklist_lock read-locked or better,
- * and the siglock not locked. It may momentarily take the siglock.
- *
* When sampling multiple threads for RUSAGE_SELF, under SMP we might have
* races with threads incrementing their own counters. But since word
* reads are atomic, we either get new values or old values and we don't
* the c* fields from p->signal from races with exit.c updating those
* fields when reaping, so a sample either gets all the additions of a
* given child after it's reaped, or none so this sample is before reaping.
+ *
+ * tasklist_lock locking optimisation:
+ * If we are current and single threaded, we do not need to take the tasklist
+ * lock or the siglock. No one else can take our signal_struct away,
+ * no one else can reap the children to update signal->c* counters, and
+ * no one else can race with the signal-> fields.
+ * If we do not take the tasklist_lock, the signal-> fields could be read
+ * out of order while another thread was just exiting. So we place a
+ * read memory barrier when we avoid the lock. On the writer side,
+ * write memory barrier is implied in __exit_signal as __exit_signal releases
+ * the siglock spinlock after updating the signal-> fields.
+ *
+ * We don't really need the siglock when we access the non c* fields
+ * of the signal_struct (for RUSAGE_SELF) even in multithreaded
+ * case, since we take the tasklist lock for read and the non c* signal->
+ * fields are updated only in __exit_signal, which is called with
+ * tasklist_lock taken for write, hence these two threads cannot execute
+ * concurrently.
+ *
*/
static void k_getrusage(struct task_struct *p, int who, struct rusage *r)
struct task_struct *t;
unsigned long flags;
cputime_t utime, stime;
+ int need_lock = 0;
memset((char *) r, 0, sizeof *r);
+ utime = stime = cputime_zero;
- if (unlikely(!p->signal))
- return;
+ if (p != current || !thread_group_empty(p))
+ need_lock = 1;
+
+ if (need_lock) {
+ read_lock(&tasklist_lock);
+ if (unlikely(!p->signal)) {
+ read_unlock(&tasklist_lock);
+ return;
+ }
+ } else
+ /* See locking comments above */
+ smp_rmb();
switch (who) {
+ case RUSAGE_BOTH:
case RUSAGE_CHILDREN:
spin_lock_irqsave(&p->sighand->siglock, flags);
utime = p->signal->cutime;
r->ru_minflt = p->signal->cmin_flt;
r->ru_majflt = p->signal->cmaj_flt;
spin_unlock_irqrestore(&p->sighand->siglock, flags);
- cputime_to_timeval(utime, &r->ru_utime);
- cputime_to_timeval(stime, &r->ru_stime);
- break;
+
+ if (who == RUSAGE_CHILDREN)
+ break;
+
case RUSAGE_SELF:
- spin_lock_irqsave(&p->sighand->siglock, flags);
- utime = stime = cputime_zero;
- goto sum_group;
- case RUSAGE_BOTH:
- spin_lock_irqsave(&p->sighand->siglock, flags);
- utime = p->signal->cutime;
- stime = p->signal->cstime;
- r->ru_nvcsw = p->signal->cnvcsw;
- r->ru_nivcsw = p->signal->cnivcsw;
- r->ru_minflt = p->signal->cmin_flt;
- r->ru_majflt = p->signal->cmaj_flt;
- sum_group:
utime = cputime_add(utime, p->signal->utime);
stime = cputime_add(stime, p->signal->stime);
r->ru_nvcsw += p->signal->nvcsw;
r->ru_majflt += t->maj_flt;
t = next_thread(t);
} while (t != p);
- spin_unlock_irqrestore(&p->sighand->siglock, flags);
- cputime_to_timeval(utime, &r->ru_utime);
- cputime_to_timeval(stime, &r->ru_stime);
break;
+
default:
BUG();
}
+
+ if (need_lock)
+ read_unlock(&tasklist_lock);
+ cputime_to_timeval(utime, &r->ru_utime);
+ cputime_to_timeval(stime, &r->ru_stime);
}
int getrusage(struct task_struct *p, int who, struct rusage __user *ru)
{
struct rusage r;
- read_lock(&tasklist_lock);
k_getrusage(p, who, &r);
- read_unlock(&tasklist_lock);
return copy_to_user(ru, &r, sizeof(r)) ? -EFAULT : 0;
}
unsigned long arg4, unsigned long arg5)
{
long error;
- int sig;
error = security_task_prctl(option, arg2, arg3, arg4, arg5);
if (error)
switch (option) {
case PR_SET_PDEATHSIG:
- sig = arg2;
- if (!valid_signal(sig)) {
+ if (!valid_signal(arg2)) {
error = -EINVAL;
break;
}
- current->pdeath_signal = sig;
+ current->pdeath_signal = arg2;
break;
case PR_GET_PDEATHSIG:
error = put_user(current->pdeath_signal, (int __user *)arg2);
break;
case PR_GET_DUMPABLE:
- if (current->mm->dumpable)
- error = 1;
+ error = current->mm->dumpable;
break;
case PR_SET_DUMPABLE:
if (arg2 < 0 || arg2 > 2) {
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff