* 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/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.
- */
-
-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.
+ * If set, this is used for preparing the system to power off.
*/
-
-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_thread(pgrp, PIDTYPE_PGID, p) {
error = set_one_prio(p, niceval, error);
- } while_each_task_pid(who, PIDTYPE_PGID, p);
+ } while_each_pid_thread(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_thread(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_thread(pgrp, PIDTYPE_PGID, p);
break;
case PRIO_USER:
user = current->user;
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);
-/**
- * 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)
+static void kernel_shutdown_prepare(enum system_states state)
{
- notifier_call_chain(&reboot_notifier_list,
+ blocking_notifier_call_chain(&reboot_notifier_list,
(state == SYSTEM_HALT)?SYS_HALT:SYS_POWER_OFF, NULL);
system_state = state;
device_shutdown();
void kernel_halt(void)
{
kernel_shutdown_prepare(SYSTEM_HALT);
+ sysdev_shutdown();
printk(KERN_EMERG "System halted.\n");
machine_halt();
}
void kernel_power_off(void)
{
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();
}
kernel_restart(buffer);
break;
+#ifdef CONFIG_KEXEC
case LINUX_REBOOT_CMD_KEXEC:
- kernel_kexec();
- unlock_kernel();
- return -EINVAL;
+ {
+ int ret;
+ ret = kernel_kexec();
+ unlock_kernel();
+ return ret;
+ }
+#endif
-#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;
return old_fsgid;
}
+void do_sys_times(struct tms *tms)
+{
+ struct task_cputime cputime;
+ cputime_t cutime, cstime;
+
+ thread_group_cputime(current, &cputime);
+ spin_lock_irq(¤t->sighand->siglock);
+ cutime = current->signal->cutime;
+ cstime = current->signal->cstime;
+ spin_unlock_irq(¤t->sighand->siglock);
+ tms->tms_utime = cputime_to_clock_t(cputime.utime);
+ tms->tms_stime = cputime_to_clock_t(cputime.stime);
+ tms->tms_cutime = cputime_to_clock_t(cutime);
+ tms->tms_cstime = cputime_to_clock_t(cstime);
+}
+
asmlinkage long sys_times(struct tms __user * tbuf)
{
- /*
- * In the SMP world we might just be unlucky and have one of
- * the times increment as we use it. Since the value is an
- * atomically safe type this is just fine. Conceptually its
- * as if the syscall took an instant longer to occur.
- */
if (tbuf) {
struct tms tmp;
- 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
- {
-
- /* 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);
- tmp.tms_cstime = cputime_to_clock_t(cstime);
+ do_sys_times(&tmp);
if (copy_to_user(tbuf, &tmp, sizeof(struct tms)))
return -EFAULT;
}
* 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;
struct task_struct *group_leader = current->group_leader;
- int err = -EINVAL;
+ struct pid *pgrp;
+ int err;
if (!pid)
- pid = group_leader->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->real_parent == group_leader) {
+ if (same_thread_group(p->real_parent, group_leader)) {
err = -EPERM;
- if (p->signal->session != group_leader->signal->session)
+ if (task_session(p) != task_session(group_leader))
goto out;
err = -EACCES;
if (p->did_exec)
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 == group_leader->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) {
- detach_pid(p, PIDTYPE_PGID);
- p->signal->pgrp = pgid;
- attach_pid(p, PIDTYPE_PGID, pgid);
+ if (task_pgrp(p) != pgrp) {
+ change_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 {
- int retval;
- struct task_struct *p;
-
- read_lock(&tasklist_lock);
- p = find_task_by_pid(pid);
+ struct task_struct *p;
+ struct pid *grp;
+ int retval;
+ rcu_read_lock();
+ if (!pid)
+ grp = task_pgrp(current);
+ else {
retval = -ESRCH;
- if (p) {
- retval = security_task_getpgid(p);
- if (!retval)
- retval = process_group(p);
- }
- read_unlock(&tasklist_lock);
- return retval;
+ p = find_task_by_vpid(pid);
+ if (!p)
+ goto out;
+ grp = task_pgrp(p);
+ if (!grp)
+ goto out;
+
+ retval = security_task_getpgid(p);
+ if (retval)
+ goto out;
}
+ retval = pid_vnr(grp);
+out:
+ rcu_read_unlock();
+ return retval;
}
#ifdef __ARCH_WANT_SYS_GETPGRP
asmlinkage long sys_getpgrp(void)
{
- /* SMP - assuming writes are word atomic this is fine */
- return process_group(current);
+ return sys_getpgid(0);
}
#endif
asmlinkage long sys_getsid(pid_t pid)
{
- if (!pid) {
- return current->signal->session;
- } else {
- int retval;
- struct task_struct *p;
-
- read_lock(&tasklist_lock);
- p = find_task_by_pid(pid);
+ struct task_struct *p;
+ struct pid *sid;
+ int retval;
+ rcu_read_lock();
+ if (!pid)
+ sid = task_session(current);
+ else {
retval = -ESRCH;
- if(p) {
- retval = security_task_getsid(p);
- if (!retval)
- retval = p->signal->session;
- }
- read_unlock(&tasklist_lock);
- return retval;
+ p = find_task_by_vpid(pid);
+ if (!p)
+ goto out;
+ sid = task_session(p);
+ if (!sid)
+ goto out;
+
+ retval = security_task_getsid(p);
+ if (retval)
+ goto out;
}
+ retval = pid_vnr(sid);
+out:
+ rcu_read_unlock();
+ return retval;
}
asmlinkage long sys_setsid(void)
{
struct task_struct *group_leader = current->group_leader;
- struct pid *pid;
+ struct pid *sid = task_pid(group_leader);
+ pid_t session = pid_vnr(sid);
int err = -EPERM;
- mutex_lock(&tty_mutex);
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, group_leader->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;
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);
+ __set_special_pids(sid);
+
+ proc_clear_tty(group_leader);
+
+ err = session;
out:
write_unlock_irq(&tasklist_lock);
- mutex_unlock(&tty_mutex);
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;
int in_group_p(gid_t grp)
{
int retval = 1;
- if (grp != current->fsgid) {
+ if (grp != current->fsgid)
retval = groups_search(current->group_info, grp);
- }
return retval;
}
int in_egroup_p(gid_t grp)
{
int retval = 1;
- if (grp != current->egid) {
+ if (grp != current->egid)
retval = groups_search(current->group_info, grp);
- }
return retval;
}
DECLARE_RWSEM(uts_sem);
-EXPORT_SYMBOL(uts_sem);
-
asmlinkage long sys_newuname(struct new_utsname __user * name)
{
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;
+ struct new_utsname *u = utsname();
+
+ memcpy(u->nodename, tmp, len);
+ memset(u->nodename + len, 0, sizeof(u->nodename) - len);
errno = 0;
}
up_write(&uts_sem);
asmlinkage long sys_gethostname(char __user *name, int len)
{
int i, errno;
+ struct new_utsname *u;
if (len < 0)
return -EINVAL;
down_read(&uts_sem);
- i = 1 + strlen(system_utsname.nodename);
+ u = utsname();
+ i = 1 + strlen(u->nodename);
if (i > len)
i = len;
errno = 0;
- if (copy_to_user(name, system_utsname.nodename, i))
+ if (copy_to_user(name, u->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;
+ struct new_utsname *u = utsname();
+
+ memcpy(u->domainname, tmp, len);
+ memset(u->domainname + len, 0, sizeof(u->domainname) - len);
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)))
return -EFAULT;
- 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) {
+ if (new_rlim.rlim_max == RLIM_INFINITY)
+ new_rlim.rlim_max = sysctl_nr_open;
+ if (new_rlim.rlim_cur == RLIM_INFINITY)
+ new_rlim.rlim_cur = sysctl_nr_open;
+ if (new_rlim.rlim_max > sysctl_nr_open)
+ return -EPERM;
+ }
+
+ if (new_rlim.rlim_cur > new_rlim.rlim_max)
+ return -EINVAL;
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 (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);
- spin_unlock_irq(¤t->sighand->siglock);
- read_unlock(&tasklist_lock);
- }
+ update_rlimit_cpu(new_rlim.rlim_cur);
out:
return 0;
}
* 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.
+ * 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)
+{
+ 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;
unsigned long flags;
cputime_t utime, stime;
- int need_lock = 0;
+ struct task_cputime cputime;
memset((char *) r, 0, sizeof *r);
utime = stime = cputime_zero;
- if (p != current || !thread_group_empty(p))
- need_lock = 1;
+ if (who == RUSAGE_THREAD) {
+ accumulate_thread_rusage(p, r);
+ goto out;
+ }
- if (need_lock) {
- read_lock(&tasklist_lock);
- if (unlikely(!p->signal)) {
- read_unlock(&tasklist_lock);
- return;
- }
- } else
- /* See locking comments above */
- smp_rmb();
+ if (!lock_task_sighand(p, &flags))
+ 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);
+ r->ru_inblock = p->signal->cinblock;
+ r->ru_oublock = p->signal->coublock;
if (who == RUSAGE_CHILDREN)
break;
case RUSAGE_SELF:
- utime = cputime_add(utime, p->signal->utime);
- stime = cputime_add(stime, p->signal->stime);
+ thread_group_cputime(p, &cputime);
+ utime = cputime_add(utime, cputime.utime);
+ stime = cputime_add(stime, cputime.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);
t = next_thread(t);
} while (t != p);
break;
default:
BUG();
}
+ unlock_task_sighand(p, &flags);
- if (need_lock)
- read_unlock(&tasklist_lock);
+out:
cputime_to_timeval(utime, &r->ru_utime);
cputime_to_timeval(stime, &r->ru_stime);
}
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 error = 0;
- 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 = PR_TIMING_STATISTICAL;
break;
case PR_SET_TIMING:
- if (arg2 == PR_TIMING_STATISTICAL)
- error = 0;
- else
+ if (arg2 != PR_TIMING_STATISTICAL)
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;
+ case PR_GET_TIMERSLACK:
+ error = current->timer_slack_ns;
+ break;
+ case PR_SET_TIMERSLACK:
+ if (arg2 <= 0)
+ current->timer_slack_ns =
+ current->default_timer_slack_ns;
+ else
+ current->timer_slack_ns = 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, GFP_ATOMIC);
+ 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