* Copyright (C) 1991, 1992 Linus Torvalds
*/
-#include <linux/config.h>
#include <linux/module.h>
#include <linux/mm.h>
#include <linux/utsname.h>
#include <linux/notifier.h>
#include <linux/reboot.h>
#include <linux/prctl.h>
-#include <linux/init.h>
#include <linux/highuid.h>
#include <linux/fs.h>
+#include <linux/resource.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/tty.h>
#include <linux/signal.h>
#include <linux/cn_proc.h>
+#include <linux/getcpu.h>
+#include <linux/task_io_accounting_ops.h>
+#include <linux/seccomp.h>
+#include <linux/cpu.h>
#include <linux/compat.h>
#include <linux/syscalls.h>
#include <linux/kprobes.h>
+#include <linux/user_namespace.h>
#include <asm/uaccess.h>
#include <asm/io.h>
#ifndef GET_FPEXC_CTL
# define GET_FPEXC_CTL(a,b) (-EINVAL)
#endif
+#ifndef GET_ENDIAN
+# define GET_ENDIAN(a,b) (-EINVAL)
+#endif
+#ifndef SET_ENDIAN
+# define SET_ENDIAN(a,b) (-EINVAL)
+#endif
+#ifndef GET_TSC_CTL
+# define GET_TSC_CTL(a) (-EINVAL)
+#endif
+#ifndef SET_TSC_CTL
+# define SET_TSC_CTL(a) (-EINVAL)
+#endif
/*
* this is where the system-wide overflow UID and GID are defined, for
*/
int C_A_D = 1;
-int cad_pid = 1;
+struct pid *cad_pid;
+EXPORT_SYMBOL(cad_pid);
/*
- * Notifier list for kernel code which wants to be called
- * at shutdown. This is used to stop any idling DMA operations
- * and the like.
- */
-
-static struct notifier_block *reboot_notifier_list;
-static DEFINE_RWLOCK(notifier_lock);
-
-/**
- * notifier_chain_register - Add notifier to a notifier chain
- * @list: Pointer to root list pointer
- * @n: New entry in notifier chain
- *
- * Adds a notifier to a notifier chain.
- *
- * Currently always returns zero.
+ * If set, this is used for preparing the system to power off.
*/
-
-int notifier_chain_register(struct notifier_block **list, struct notifier_block *n)
-{
- write_lock(¬ifier_lock);
- while(*list)
- {
- if(n->priority > (*list)->priority)
- break;
- list= &((*list)->next);
- }
- n->next = *list;
- *list=n;
- write_unlock(¬ifier_lock);
- return 0;
-}
-
-EXPORT_SYMBOL(notifier_chain_register);
-
-/**
- * notifier_chain_unregister - Remove notifier from a notifier chain
- * @nl: Pointer to root list pointer
- * @n: New entry in notifier chain
- *
- * Removes a notifier from a notifier chain.
- *
- * Returns zero on success, or %-ENOENT on failure.
- */
-
-int notifier_chain_unregister(struct notifier_block **nl, struct notifier_block *n)
-{
- write_lock(¬ifier_lock);
- while((*nl)!=NULL)
- {
- if((*nl)==n)
- {
- *nl=n->next;
- write_unlock(¬ifier_lock);
- return 0;
- }
- nl=&((*nl)->next);
- }
- write_unlock(¬ifier_lock);
- return -ENOENT;
-}
-
-EXPORT_SYMBOL(notifier_chain_unregister);
-
-/**
- * notifier_call_chain - Call functions in a notifier chain
- * @n: Pointer to root pointer of notifier chain
- * @val: Value passed unmodified to notifier function
- * @v: Pointer passed unmodified to notifier function
- *
- * Calls each function in a notifier chain in turn.
- *
- * If the return value of the notifier can be and'd
- * with %NOTIFY_STOP_MASK, then notifier_call_chain
- * will return immediately, with the return value of
- * the notifier function which halted execution.
- * Otherwise, the return value is the return value
- * of the last notifier function called.
- */
-
-int __kprobes notifier_call_chain(struct notifier_block **n, unsigned long val, void *v)
-{
- int ret=NOTIFY_DONE;
- struct notifier_block *nb = *n;
-
- while(nb)
- {
- ret=nb->notifier_call(nb,val,v);
- if(ret&NOTIFY_STOP_MASK)
- {
- return ret;
- }
- nb=nb->next;
- }
- return ret;
-}
-
-EXPORT_SYMBOL(notifier_call_chain);
-
-/**
- * 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 notifier_chain_register
- * always returns zero.
- */
-
-int register_reboot_notifier(struct notifier_block * nb)
-{
- return 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 notifier_chain_unregister(&reboot_notifier_list, nb);
-}
-
-EXPORT_SYMBOL(unregister_reboot_notifier);
+void (*pm_power_off_prepare)(void);
static int set_one_prio(struct task_struct *p, int niceval, int error)
{
struct task_struct *g, *p;
struct user_struct *user;
int error = -EINVAL;
+ struct pid *pgrp;
- if (which > 2 || which < 0)
+ if (which > PRIO_USER || which < PRIO_PROCESS)
goto out;
/* normalize: avoid signed division (rounding problems) */
read_lock(&tasklist_lock);
switch (which) {
case PRIO_PROCESS:
- if (!who)
- who = current->pid;
- p = find_task_by_pid(who);
+ if (who)
+ p = find_task_by_vpid(who);
+ else
+ p = current;
if (p)
error = set_one_prio(p, niceval, error);
break;
case PRIO_PGRP:
- if (!who)
- who = process_group(current);
- do_each_task_pid(who, PIDTYPE_PGID, p) {
+ if (who)
+ pgrp = find_vpid(who);
+ else
+ pgrp = task_pgrp(current);
+ do_each_pid_task(pgrp, PIDTYPE_PGID, p) {
error = set_one_prio(p, niceval, error);
- } while_each_task_pid(who, PIDTYPE_PGID, p);
+ } while_each_pid_task(pgrp, PIDTYPE_PGID, p);
break;
case PRIO_USER:
user = current->user;
struct task_struct *g, *p;
struct user_struct *user;
long niceval, retval = -ESRCH;
+ struct pid *pgrp;
- if (which > 2 || which < 0)
+ if (which > PRIO_USER || which < PRIO_PROCESS)
return -EINVAL;
read_lock(&tasklist_lock);
switch (which) {
case PRIO_PROCESS:
- if (!who)
- who = current->pid;
- p = find_task_by_pid(who);
+ if (who)
+ p = find_task_by_vpid(who);
+ else
+ p = current;
if (p) {
niceval = 20 - task_nice(p);
if (niceval > retval)
}
break;
case PRIO_PGRP:
- if (!who)
- who = process_group(current);
- do_each_task_pid(who, PIDTYPE_PGID, p) {
+ if (who)
+ pgrp = find_vpid(who);
+ else
+ pgrp = task_pgrp(current);
+ do_each_pid_task(pgrp, PIDTYPE_PGID, p) {
niceval = 20 - task_nice(p);
if (niceval > retval)
retval = niceval;
- } while_each_task_pid(who, PIDTYPE_PGID, p);
+ } while_each_pid_task(pgrp, PIDTYPE_PGID, p);
break;
case PRIO_USER:
user = current->user;
}
EXPORT_SYMBOL_GPL(emergency_restart);
-void kernel_restart_prepare(char *cmd)
+static void kernel_restart_prepare(char *cmd)
{
- notifier_call_chain(&reboot_notifier_list, SYS_RESTART, cmd);
+ blocking_notifier_call_chain(&reboot_notifier_list, SYS_RESTART, cmd);
system_state = SYSTEM_RESTART;
device_shutdown();
+ sysdev_shutdown();
}
/**
void kernel_restart(char *cmd)
{
kernel_restart_prepare(cmd);
- if (!cmd) {
+ if (!cmd)
printk(KERN_EMERG "Restarting system.\n");
- } else {
+ else
printk(KERN_EMERG "Restarting system with command '%s'.\n", cmd);
- }
- printk(".\n");
machine_restart(cmd);
}
EXPORT_SYMBOL_GPL(kernel_restart);
* Move into place and start executing a preloaded standalone
* executable. If nothing was preloaded return an error.
*/
-void kernel_kexec(void)
+static void kernel_kexec(void)
{
#ifdef CONFIG_KEXEC
struct kimage *image;
- image = xchg(&kexec_image, 0);
- if (!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);
+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;
+ device_shutdown();
+}
/**
* kernel_halt - halt the system
*
* Shutdown everything and perform a clean system halt.
*/
-void kernel_halt_prepare(void)
-{
- notifier_call_chain(&reboot_notifier_list, SYS_HALT, NULL);
- system_state = SYSTEM_HALT;
- device_shutdown();
-}
void kernel_halt(void)
{
- kernel_halt_prepare();
+ kernel_shutdown_prepare(SYSTEM_HALT);
+ sysdev_shutdown();
printk(KERN_EMERG "System halted.\n");
machine_halt();
}
+
EXPORT_SYMBOL_GPL(kernel_halt);
/**
*
* Shutdown everything and perform a clean system power_off.
*/
-void kernel_power_off_prepare(void)
-{
- notifier_call_chain(&reboot_notifier_list, SYS_POWER_OFF, NULL);
- system_state = SYSTEM_POWER_OFF;
- device_shutdown();
-}
void kernel_power_off(void)
{
- kernel_power_off_prepare();
+ kernel_shutdown_prepare(SYSTEM_POWER_OFF);
+ if (pm_power_off_prepare)
+ pm_power_off_prepare();
+ disable_nonboot_cpus();
+ sysdev_shutdown();
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:
unlock_kernel();
return -EINVAL;
-#ifdef CONFIG_SOFTWARE_SUSPEND
+#ifdef CONFIG_HIBERNATION
case LINUX_REBOOT_CMD_SW_SUSPEND:
{
- int ret = software_suspend();
+ int ret = hibernate();
unlock_kernel();
return ret;
}
return 0;
}
-static void deferred_cad(void *dummy)
+static void deferred_cad(struct work_struct *dummy)
{
kernel_restart(NULL);
}
*/
void ctrl_alt_del(void)
{
- static DECLARE_WORK(cad_work, deferred_cad, NULL);
+ static DECLARE_WORK(cad_work, deferred_cad);
if (C_A_D)
schedule_work(&cad_work);
else
- kill_proc(cad_pid, SIGINT, 1);
+ kill_cad_pid(SIGINT, 1);
}
-
/*
* Unprivileged users may change the real gid to the effective gid
* or vice versa. (BSD-style)
(current->sgid == egid) ||
capable(CAP_SETGID))
new_egid = egid;
- else {
+ else
return -EPERM;
- }
}
- if (new_egid != old_egid)
- {
- current->mm->dumpable = suid_dumpable;
+ if (new_egid != old_egid) {
+ set_dumpable(current->mm, suid_dumpable);
smp_wmb();
}
if (rgid != (gid_t) -1 ||
if (retval)
return retval;
- if (capable(CAP_SETGID))
- {
- if(old_egid != gid)
- {
- current->mm->dumpable = suid_dumpable;
+ if (capable(CAP_SETGID)) {
+ if (old_egid != gid) {
+ set_dumpable(current->mm, suid_dumpable);
smp_wmb();
}
current->gid = current->egid = current->sgid = current->fsgid = gid;
- }
- else if ((gid == current->gid) || (gid == current->sgid))
- {
- if(old_egid != gid)
- {
- current->mm->dumpable = suid_dumpable;
+ } else if ((gid == current->gid) || (gid == current->sgid)) {
+ if (old_egid != gid) {
+ set_dumpable(current->mm, suid_dumpable);
smp_wmb();
}
current->egid = current->fsgid = gid;
{
struct user_struct *new_user;
- new_user = alloc_uid(new_ruid);
+ new_user = alloc_uid(current->nsproxy->user_ns, new_ruid);
if (!new_user)
return -EAGAIN;
if (atomic_read(&new_user->processes) >=
current->signal->rlim[RLIMIT_NPROC].rlim_cur &&
- new_user != &root_user) {
+ new_user != current->nsproxy->user_ns->root_user) {
free_uid(new_user);
return -EAGAIN;
}
switch_uid(new_user);
- if(dumpclear)
- {
- current->mm->dumpable = suid_dumpable;
+ if (dumpclear) {
+ set_dumpable(current->mm, suid_dumpable);
smp_wmb();
}
current->uid = new_ruid;
if (new_ruid != old_ruid && set_user(new_ruid, new_euid != old_euid) < 0)
return -EAGAIN;
- if (new_euid != old_euid)
- {
- current->mm->dumpable = suid_dumpable;
+ if (new_euid != old_euid) {
+ set_dumpable(current->mm, suid_dumpable);
smp_wmb();
}
current->fsuid = current->euid = new_euid;
asmlinkage long sys_setuid(uid_t uid)
{
int old_euid = current->euid;
- int old_ruid, old_suid, new_ruid, new_suid;
+ int old_ruid, old_suid, new_suid;
int retval;
retval = security_task_setuid(uid, (uid_t)-1, (uid_t)-1, LSM_SETID_ID);
if (retval)
return retval;
- old_ruid = new_ruid = current->uid;
+ old_ruid = current->uid;
old_suid = current->suid;
new_suid = old_suid;
} else if ((uid != current->uid) && (uid != new_suid))
return -EPERM;
- if (old_euid != uid)
- {
- current->mm->dumpable = suid_dumpable;
+ if (old_euid != uid) {
+ set_dumpable(current->mm, suid_dumpable);
smp_wmb();
}
current->fsuid = current->euid = uid;
return -EAGAIN;
}
if (euid != (uid_t) -1) {
- if (euid != current->euid)
- {
- current->mm->dumpable = suid_dumpable;
+ if (euid != current->euid) {
+ set_dumpable(current->mm, suid_dumpable);
smp_wmb();
}
current->euid = euid;
return -EPERM;
}
if (egid != (gid_t) -1) {
- if (egid != current->egid)
- {
- current->mm->dumpable = suid_dumpable;
+ if (egid != current->egid) {
+ set_dumpable(current->mm, suid_dumpable);
smp_wmb();
}
current->egid = egid;
if (uid == current->uid || uid == current->euid ||
uid == current->suid || uid == current->fsuid ||
- capable(CAP_SETUID))
- {
- if (uid != old_fsuid)
- {
- current->mm->dumpable = suid_dumpable;
+ capable(CAP_SETUID)) {
+ if (uid != old_fsuid) {
+ set_dumpable(current->mm, suid_dumpable);
smp_wmb();
}
current->fsuid = uid;
}
/*
- * Samma på svenska..
+ * Samma på svenska..
*/
asmlinkage long sys_setfsgid(gid_t gid)
{
if (gid == current->gid || gid == current->egid ||
gid == current->sgid || gid == current->fsgid ||
- capable(CAP_SETGID))
- {
- if (gid != old_fsgid)
- {
- current->mm->dumpable = suid_dumpable;
+ capable(CAP_SETGID)) {
+ if (gid != old_fsgid) {
+ set_dumpable(current->mm, suid_dumpable);
smp_wmb();
}
current->fsgid = gid;
*/
if (tbuf) {
struct tms tmp;
+ struct task_struct *tsk = current;
+ struct task_struct *t;
cputime_t utime, stime, cutime, cstime;
-#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
- {
+ spin_lock_irq(&tsk->sighand->siglock);
+ 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);
- /* Process with multiple threads */
- struct task_struct *tsk = current;
- struct task_struct *t;
+ cutime = tsk->signal->cutime;
+ cstime = tsk->signal->cstime;
+ spin_unlock_irq(&tsk->sighand->siglock);
- 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);
* Auch. Had to add the 'did_exec' flag to conform completely to POSIX.
* LBT 04.03.94
*/
-
asmlinkage long sys_setpgid(pid_t pid, pid_t pgid)
{
struct task_struct *p;
- int err = -EINVAL;
+ struct task_struct *group_leader = current->group_leader;
+ struct pid *pgrp;
+ int err;
if (!pid)
- pid = current->pid;
+ pid = task_pid_vnr(group_leader);
if (!pgid)
pgid = pid;
if (pgid < 0)
write_lock_irq(&tasklist_lock);
err = -ESRCH;
- p = find_task_by_pid(pid);
+ p = find_task_by_vpid(pid);
if (!p)
goto out;
if (!thread_group_leader(p))
goto out;
- if (p->parent == current || p->real_parent == current) {
+ if (same_thread_group(p->real_parent, group_leader)) {
err = -EPERM;
- if (p->signal->session != current->signal->session)
+ if (task_session(p) != task_session(group_leader))
goto out;
err = -EACCES;
if (p->did_exec)
goto out;
} else {
err = -ESRCH;
- if (p != current)
+ if (p != group_leader)
goto out;
}
if (p->signal->leader)
goto out;
+ pgrp = task_pid(p);
if (pgid != pid) {
- struct task_struct *p;
+ struct task_struct *g;
- do_each_task_pid(pgid, PIDTYPE_PGID, p) {
- if (p->signal->session == current->signal->session)
- goto ok_pgid;
- } while_each_task_pid(pgid, PIDTYPE_PGID, p);
- goto out;
+ pgrp = find_vpid(pgid);
+ g = pid_task(pgrp, PIDTYPE_PGID);
+ if (!g || task_session(g) != task_session(group_leader))
+ goto out;
}
-ok_pgid:
err = security_task_setpgid(p, pgid);
if (err)
goto out;
- if (process_group(p) != pgid) {
+ if (task_pgrp(p) != pgrp) {
detach_pid(p, PIDTYPE_PGID);
- p->signal->pgrp = pgid;
- attach_pid(p, PIDTYPE_PGID, pgid);
+ attach_pid(p, PIDTYPE_PGID, pgrp);
+ set_task_pgrp(p, pid_nr(pgrp));
}
err = 0;
asmlinkage long sys_getpgid(pid_t pid)
{
- if (!pid) {
- return process_group(current);
- } else {
+ if (!pid)
+ return task_pgrp_vnr(current);
+ else {
int retval;
struct task_struct *p;
read_lock(&tasklist_lock);
- p = find_task_by_pid(pid);
-
+ p = find_task_by_vpid(pid);
retval = -ESRCH;
if (p) {
retval = security_task_getpgid(p);
if (!retval)
- retval = process_group(p);
+ retval = task_pgrp_vnr(p);
}
read_unlock(&tasklist_lock);
return retval;
asmlinkage long sys_getpgrp(void)
{
/* SMP - assuming writes are word atomic this is fine */
- return process_group(current);
+ return task_pgrp_vnr(current);
}
#endif
asmlinkage long sys_getsid(pid_t pid)
{
- if (!pid) {
- return current->signal->session;
- } else {
+ if (!pid)
+ return task_session_vnr(current);
+ else {
int retval;
struct task_struct *p;
- read_lock(&tasklist_lock);
- p = find_task_by_pid(pid);
-
+ rcu_read_lock();
+ p = find_task_by_vpid(pid);
retval = -ESRCH;
- if(p) {
+ if (p) {
retval = security_task_getsid(p);
if (!retval)
- retval = p->signal->session;
+ retval = task_session_vnr(p);
}
- read_unlock(&tasklist_lock);
+ rcu_read_unlock();
return retval;
}
}
asmlinkage long sys_setsid(void)
{
- struct pid *pid;
+ struct task_struct *group_leader = current->group_leader;
+ struct pid *sid = task_pid(group_leader);
+ pid_t session = pid_vnr(sid);
int err = -EPERM;
- if (!thread_group_leader(current))
- return -EINVAL;
-
- down(&tty_sem);
write_lock_irq(&tasklist_lock);
+ /* Fail if I am already a session leader */
+ if (group_leader->signal->leader)
+ goto out;
- pid = find_pid(PIDTYPE_PGID, current->pid);
- if (pid)
+ /* Fail if a process group id already exists that equals the
+ * proposed session id.
+ */
+ if (pid_task(sid, PIDTYPE_PGID))
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(sid);
+
+ spin_lock(&group_leader->sighand->siglock);
+ group_leader->signal->tty = NULL;
+ spin_unlock(&group_leader->sighand->siglock);
+
+ err = session;
out:
write_unlock_irq(&tasklist_lock);
- up(&tty_sem);
return err;
}
group_info->nblocks = nblocks;
atomic_set(&group_info->usage, 1);
- if (gidsetsize <= NGROUPS_SMALL) {
+ if (gidsetsize <= NGROUPS_SMALL)
group_info->blocks[0] = group_info->small_block;
- } else {
+ else {
for (i = 0; i < nblocks; i++) {
gid_t *b;
b = (void *)__get_free_page(GFP_USER);
struct group_info *group_info)
{
int i;
- int count = group_info->ngroups;
+ unsigned int count = group_info->ngroups;
for (i = 0; i < group_info->nblocks; i++) {
- int cp_count = min(NGROUPS_PER_BLOCK, count);
- int off = i * NGROUPS_PER_BLOCK;
- int len = cp_count * sizeof(*grouplist);
+ unsigned int cp_count = min(NGROUPS_PER_BLOCK, count);
+ unsigned int len = cp_count * sizeof(*grouplist);
- if (copy_to_user(grouplist+off, group_info->blocks[i], len))
+ if (copy_to_user(grouplist, group_info->blocks[i], len))
return -EFAULT;
+ grouplist += NGROUPS_PER_BLOCK;
count -= cp_count;
}
return 0;
/* fill a group_info from a user-space array - it must be allocated already */
static int groups_from_user(struct group_info *group_info,
gid_t __user *grouplist)
- {
+{
int i;
- int count = group_info->ngroups;
+ unsigned int count = group_info->ngroups;
for (i = 0; i < group_info->nblocks; i++) {
- int cp_count = min(NGROUPS_PER_BLOCK, count);
- int off = i * NGROUPS_PER_BLOCK;
- int len = cp_count * sizeof(*grouplist);
+ unsigned int cp_count = min(NGROUPS_PER_BLOCK, count);
+ unsigned int len = cp_count * sizeof(*grouplist);
- if (copy_from_user(group_info->blocks[i], grouplist+off, len))
+ if (copy_from_user(group_info->blocks[i], grouplist, len))
return -EFAULT;
+ grouplist += NGROUPS_PER_BLOCK;
count -= cp_count;
}
return 0;
/* a simple bsearch */
int groups_search(struct group_info *group_info, gid_t grp)
{
- int left, right;
+ unsigned int left, right;
if (!group_info)
return 0;
left = 0;
right = group_info->ngroups;
while (left < right) {
- int mid = (left+right)/2;
+ unsigned int mid = (left+right)/2;
int cmp = grp - GROUP_AT(group_info, mid);
if (cmp > 0)
left = mid + 1;
return -EINVAL;
/* no need to grab task_lock here; it cannot change */
- get_group_info(current->group_info);
i = current->group_info->ngroups;
if (gidsetsize) {
if (i > gidsetsize) {
}
}
out:
- put_group_info(current->group_info);
return i;
}
int in_group_p(gid_t grp)
{
int retval = 1;
- if (grp != current->fsgid) {
- get_group_info(current->group_info);
+ if (grp != current->fsgid)
retval = groups_search(current->group_info, grp);
- put_group_info(current->group_info);
- }
return retval;
}
int in_egroup_p(gid_t grp)
{
int retval = 1;
- if (grp != current->egid) {
- get_group_info(current->group_info);
+ if (grp != current->egid)
retval = groups_search(current->group_info, grp);
- put_group_info(current->group_info);
- }
return retval;
}
int errno = 0;
down_read(&uts_sem);
- if (copy_to_user(name,&system_utsname,sizeof *name))
+ if (copy_to_user(name, utsname(), sizeof *name))
errno = -EFAULT;
up_read(&uts_sem);
return errno;
down_write(&uts_sem);
errno = -EFAULT;
if (!copy_from_user(tmp, name, len)) {
- memcpy(system_utsname.nodename, tmp, len);
- system_utsname.nodename[len] = 0;
+ memcpy(utsname()->nodename, tmp, len);
+ utsname()->nodename[len] = 0;
errno = 0;
}
up_write(&uts_sem);
if (len < 0)
return -EINVAL;
down_read(&uts_sem);
- i = 1 + strlen(system_utsname.nodename);
+ i = 1 + strlen(utsname()->nodename);
if (i > len)
i = len;
errno = 0;
- if (copy_to_user(name, system_utsname.nodename, i))
+ if (copy_to_user(name, utsname()->nodename, i))
errno = -EFAULT;
up_read(&uts_sem);
return errno;
down_write(&uts_sem);
errno = -EFAULT;
if (!copy_from_user(tmp, name, len)) {
- memcpy(system_utsname.domainname, tmp, len);
- system_utsname.domainname[len] = 0;
+ memcpy(utsname()->domainname, tmp, len);
+ utsname()->domainname[len] = 0;
errno = 0;
}
up_write(&uts_sem);
task_lock(current->group_leader);
x = current->signal->rlim[resource];
task_unlock(current->group_leader);
- if(x.rlim_cur > 0x7FFFFFFF)
+ if (x.rlim_cur > 0x7FFFFFFF)
x.rlim_cur = 0x7FFFFFFF;
- if(x.rlim_max > 0x7FFFFFFF)
+ if (x.rlim_max > 0x7FFFFFFF)
x.rlim_max = 0x7FFFFFFF;
return copy_to_user(rlim, &x, sizeof(x))?-EFAULT:0;
}
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;
+ if (resource == RLIMIT_NOFILE && new_rlim.rlim_max > sysctl_nr_open)
+ return -EPERM;
retval = security_task_setrlimit(resource, &new_rlim);
if (retval)
return retval;
+ if (resource == RLIMIT_CPU && new_rlim.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
+ */
+ new_rlim.rlim_cur = 1;
+ }
+
task_lock(current->group_leader);
*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;
+
+ 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.
+ *
+ * Locking:
+ * We need to take the siglock for CHILDEREN, SELF and BOTH
+ * for the cases current multithreaded, non-current single threaded
+ * non-current multithreaded. Thread traversal is now safe with
+ * the siglock held.
+ * Strictly speaking, we donot need to take the siglock if we are current and
+ * single threaded, as 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 any lock, the
+ * signal-> fields could be read out of order while another thread was just
+ * exiting. So we should 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. But we don't do this yet to keep things simple.
+ *
*/
+static void accumulate_thread_rusage(struct task_struct *t, struct rusage *r,
+ cputime_t *utimep, cputime_t *stimep)
+{
+ *utimep = cputime_add(*utimep, t->utime);
+ *stimep = cputime_add(*stimep, t->stime);
+ r->ru_nvcsw += t->nvcsw;
+ r->ru_nivcsw += t->nivcsw;
+ r->ru_minflt += t->min_flt;
+ r->ru_majflt += t->maj_flt;
+ r->ru_inblock += task_io_get_inblock(t);
+ r->ru_oublock += task_io_get_oublock(t);
+}
+
static void k_getrusage(struct task_struct *p, int who, struct rusage *r)
{
struct task_struct *t;
cputime_t utime, stime;
memset((char *) r, 0, sizeof *r);
+ utime = stime = cputime_zero;
+
+ if (who == RUSAGE_THREAD) {
+ accumulate_thread_rusage(p, r, &utime, &stime);
+ goto out;
+ }
- if (unlikely(!p->signal))
+ rcu_read_lock();
+ if (!lock_task_sighand(p, &flags)) {
+ rcu_read_unlock();
return;
+ }
switch (who) {
+ case RUSAGE_BOTH:
case RUSAGE_CHILDREN:
- 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;
- spin_unlock_irqrestore(&p->sighand->siglock, flags);
- cputime_to_timeval(utime, &r->ru_utime);
- cputime_to_timeval(stime, &r->ru_stime);
- break;
+ r->ru_inblock = p->signal->cinblock;
+ r->ru_oublock = p->signal->coublock;
+
+ 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_nivcsw += p->signal->nivcsw;
r->ru_minflt += p->signal->min_flt;
r->ru_majflt += p->signal->maj_flt;
+ r->ru_inblock += p->signal->inblock;
+ r->ru_oublock += p->signal->oublock;
t = p;
do {
- utime = cputime_add(utime, t->utime);
- stime = cputime_add(stime, t->stime);
- r->ru_nvcsw += t->nvcsw;
- r->ru_nivcsw += t->nivcsw;
- r->ru_minflt += t->min_flt;
- r->ru_majflt += t->maj_flt;
+ accumulate_thread_rusage(t, r, &utime, &stime);
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();
}
+
+ unlock_task_sighand(p, &flags);
+ rcu_read_unlock();
+
+out:
+ 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;
}
asmlinkage long sys_getrusage(int who, struct rusage __user *ru)
{
- if (who != RUSAGE_SELF && who != RUSAGE_CHILDREN)
+ if (who != RUSAGE_SELF && who != RUSAGE_CHILDREN &&
+ who != RUSAGE_THREAD)
return -EINVAL;
return getrusage(current, who, ru);
}
mask = xchg(¤t->fs->umask, mask & S_IRWXUGO);
return mask;
}
-
+
asmlinkage long sys_prctl(int option, unsigned long arg2, unsigned long arg3,
unsigned long arg4, unsigned long arg5)
{
- long error;
+ long uninitialized_var(error);
- error = security_task_prctl(option, arg2, arg3, arg4, arg5);
- if (error)
+ if (security_task_prctl(option, arg2, arg3, arg4, arg5, &error))
return error;
switch (option) {
error = put_user(current->pdeath_signal, (int __user *)arg2);
break;
case PR_GET_DUMPABLE:
- error = current->mm->dumpable;
+ error = get_dumpable(current->mm);
break;
case PR_SET_DUMPABLE:
- if (arg2 < 0 || arg2 > 2) {
+ if (arg2 < 0 || arg2 > 1) {
error = -EINVAL;
break;
}
- current->mm->dumpable = arg2;
+ set_dumpable(current->mm, arg2);
break;
case PR_SET_UNALIGN:
error = -EINVAL;
break;
- case PR_GET_KEEPCAPS:
- if (current->keep_capabilities)
- error = 1;
- break;
- case PR_SET_KEEPCAPS:
- if (arg2 != 0 && arg2 != 1) {
- error = -EINVAL;
- break;
- }
- current->keep_capabilities = arg2;
- break;
case PR_SET_NAME: {
struct task_struct *me = current;
unsigned char ncomm[sizeof(me->comm)];
return -EFAULT;
return 0;
}
+ case PR_GET_ENDIAN:
+ error = GET_ENDIAN(current, arg2);
+ break;
+ case PR_SET_ENDIAN:
+ error = SET_ENDIAN(current, arg2);
+ break;
+
+ case PR_GET_SECCOMP:
+ error = prctl_get_seccomp();
+ break;
+ case PR_SET_SECCOMP:
+ error = prctl_set_seccomp(arg2);
+ break;
+ case PR_GET_TSC:
+ error = GET_TSC_CTL(arg2);
+ break;
+ case PR_SET_TSC:
+ error = SET_TSC_CTL(arg2);
+ break;
default:
error = -EINVAL;
break;
}
return error;
}
+
+asmlinkage long sys_getcpu(unsigned __user *cpup, unsigned __user *nodep,
+ struct getcpu_cache __user *unused)
+{
+ int err = 0;
+ int cpu = raw_smp_processor_id();
+ if (cpup)
+ err |= put_user(cpu, cpup);
+ if (nodep)
+ err |= put_user(cpu_to_node(cpu), nodep);
+ return err ? -EFAULT : 0;
+}
+
+char poweroff_cmd[POWEROFF_CMD_PATH_LEN] = "/sbin/poweroff";
+
+static void argv_cleanup(char **argv, char **envp)
+{
+ argv_free(argv);
+}
+
+/**
+ * orderly_poweroff - Trigger an orderly system poweroff
+ * @force: force poweroff if command execution fails
+ *
+ * This may be called from any context to trigger a system shutdown.
+ * If the orderly shutdown fails, it will force an immediate shutdown.
+ */
+int orderly_poweroff(bool force)
+{
+ int argc;
+ char **argv = argv_split(GFP_ATOMIC, poweroff_cmd, &argc);
+ static char *envp[] = {
+ "HOME=/",
+ "PATH=/sbin:/bin:/usr/sbin:/usr/bin",
+ NULL
+ };
+ int ret = -ENOMEM;
+ struct subprocess_info *info;
+
+ if (argv == NULL) {
+ printk(KERN_WARNING "%s failed to allocate memory for \"%s\"\n",
+ __func__, poweroff_cmd);
+ goto out;
+ }
+
+ info = call_usermodehelper_setup(argv[0], argv, envp);
+ if (info == NULL) {
+ argv_free(argv);
+ goto out;
+ }
+
+ call_usermodehelper_setcleanup(info, argv_cleanup);
+
+ ret = call_usermodehelper_exec(info, UMH_NO_WAIT);
+
+ out:
+ if (ret && force) {
+ printk(KERN_WARNING "Failed to start orderly shutdown: "
+ "forcing the issue\n");
+
+ /* I guess this should try to kick off some daemon to
+ sync and poweroff asap. Or not even bother syncing
+ if we're doing an emergency shutdown? */
+ emergency_sync();
+ kernel_power_off();
+ }
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(orderly_poweroff);
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff