zte's code,first commit
Change-Id: I9a04da59e459a9bc0d67f101f700d9d7dc8d681b
diff --git a/ap/os/linux/linux-3.4.x/kernel/sys.c b/ap/os/linux/linux-3.4.x/kernel/sys.c
new file mode 100644
index 0000000..289a04c
--- /dev/null
+++ b/ap/os/linux/linux-3.4.x/kernel/sys.c
@@ -0,0 +1,2084 @@
+/*
+ * linux/kernel/sys.c
+ *
+ * Copyright (C) 1991, 1992 Linus Torvalds
+ */
+
+#include <linux/export.h>
+#include <linux/mm.h>
+#include <linux/utsname.h>
+#include <linux/mman.h>
+#include <linux/reboot.h>
+#include <linux/prctl.h>
+#include <linux/highuid.h>
+#include <linux/fs.h>
+#include <linux/kmod.h>
+#include <linux/perf_event.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/posix-timers.h>
+#include <linux/security.h>
+#include <linux/dcookies.h>
+#include <linux/suspend.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/personality.h>
+#include <linux/ptrace.h>
+#include <linux/fs_struct.h>
+#include <linux/gfp.h>
+#include <linux/syscore_ops.h>
+#include <linux/version.h>
+#include <linux/ctype.h>
+
+#include <linux/compat.h>
+#include <linux/syscalls.h>
+#include <linux/kprobes.h>
+#include <linux/user_namespace.h>
+
+#include <linux/kmsg_dump.h>
+/* Move somewhere else to avoid recompiling? */
+#include <generated/utsrelease.h>
+
+#include <asm/uaccess.h>
+#include <asm/io.h>
+#include <asm/unistd.h>
+
+#ifndef SET_UNALIGN_CTL
+# define SET_UNALIGN_CTL(a,b) (-EINVAL)
+#endif
+#ifndef GET_UNALIGN_CTL
+# define GET_UNALIGN_CTL(a,b) (-EINVAL)
+#endif
+#ifndef SET_FPEMU_CTL
+# define SET_FPEMU_CTL(a,b) (-EINVAL)
+#endif
+#ifndef GET_FPEMU_CTL
+# define GET_FPEMU_CTL(a,b) (-EINVAL)
+#endif
+#ifndef SET_FPEXC_CTL
+# define SET_FPEXC_CTL(a,b) (-EINVAL)
+#endif
+#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
+ * architectures that now have 32-bit UID/GID but didn't in the past
+ */
+
+int overflowuid = DEFAULT_OVERFLOWUID;
+int overflowgid = DEFAULT_OVERFLOWGID;
+
+#ifdef CONFIG_UID16
+EXPORT_SYMBOL(overflowuid);
+EXPORT_SYMBOL(overflowgid);
+#endif
+
+/*
+ * the same as above, but for filesystems which can only store a 16-bit
+ * UID and GID. as such, this is needed on all architectures
+ */
+
+int fs_overflowuid = DEFAULT_FS_OVERFLOWUID;
+int fs_overflowgid = DEFAULT_FS_OVERFLOWUID;
+
+EXPORT_SYMBOL(fs_overflowuid);
+EXPORT_SYMBOL(fs_overflowgid);
+
+/*
+ * this indicates whether you can reboot with ctrl-alt-del: the default is yes
+ */
+
+int C_A_D = 1;
+struct pid *cad_pid;
+EXPORT_SYMBOL(cad_pid);
+
+/*
+ * If set, this is used for preparing the system to power off.
+ */
+
+void (*pm_power_off_prepare)(void);
+
+/*
+ * Returns true if current's euid is same as p's uid or euid,
+ * or has CAP_SYS_NICE to p's user_ns.
+ *
+ * Called with rcu_read_lock, creds are safe
+ */
+static bool set_one_prio_perm(struct task_struct *p)
+{
+ const struct cred *cred = current_cred(), *pcred = __task_cred(p);
+
+ if (pcred->user->user_ns == cred->user->user_ns &&
+ (pcred->uid == cred->euid ||
+ pcred->euid == cred->euid))
+ return true;
+ if (ns_capable(pcred->user->user_ns, CAP_SYS_NICE))
+ return true;
+ return false;
+}
+
+/*
+ * set the priority of a task
+ * - the caller must hold the RCU read lock
+ */
+static int set_one_prio(struct task_struct *p, int niceval, int error)
+{
+ int no_nice;
+
+ if (!set_one_prio_perm(p)) {
+ error = -EPERM;
+ goto out;
+ }
+ if (niceval < task_nice(p) && !can_nice(p, niceval)) {
+ error = -EACCES;
+ goto out;
+ }
+ no_nice = security_task_setnice(p, niceval);
+ if (no_nice) {
+ error = no_nice;
+ goto out;
+ }
+ if (error == -ESRCH)
+ error = 0;
+ set_user_nice(p, niceval);
+out:
+ return error;
+}
+
+SYSCALL_DEFINE3(setpriority, int, which, int, who, int, niceval)
+{
+ struct task_struct *g, *p;
+ struct user_struct *user;
+ const struct cred *cred = current_cred();
+ int error = -EINVAL;
+ struct pid *pgrp;
+
+ if (which > PRIO_USER || which < PRIO_PROCESS)
+ goto out;
+
+ /* normalize: avoid signed division (rounding problems) */
+ error = -ESRCH;
+ if (niceval < -20)
+ niceval = -20;
+ if (niceval > 19)
+ niceval = 19;
+
+ rcu_read_lock();
+ read_lock(&tasklist_lock);
+ switch (which) {
+ case PRIO_PROCESS:
+ 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)
+ 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_pid_thread(pgrp, PIDTYPE_PGID, p);
+ break;
+ case PRIO_USER:
+ user = (struct user_struct *) cred->user;
+ if (!who)
+ who = cred->uid;
+ else if ((who != cred->uid) &&
+ !(user = find_user(who)))
+ goto out_unlock; /* No processes for this user */
+
+ do_each_thread(g, p) {
+ if (__task_cred(p)->uid == who)
+ error = set_one_prio(p, niceval, error);
+ } while_each_thread(g, p);
+ if (who != cred->uid)
+ free_uid(user); /* For find_user() */
+ break;
+ }
+out_unlock:
+ read_unlock(&tasklist_lock);
+ rcu_read_unlock();
+out:
+ return error;
+}
+
+/*
+ * Ugh. To avoid negative return values, "getpriority()" will
+ * not return the normal nice-value, but a negated value that
+ * has been offset by 20 (ie it returns 40..1 instead of -20..19)
+ * to stay compatible.
+ */
+SYSCALL_DEFINE2(getpriority, int, which, int, who)
+{
+ struct task_struct *g, *p;
+ struct user_struct *user;
+ const struct cred *cred = current_cred();
+ long niceval, retval = -ESRCH;
+ struct pid *pgrp;
+
+ if (which > PRIO_USER || which < PRIO_PROCESS)
+ return -EINVAL;
+
+ rcu_read_lock();
+ read_lock(&tasklist_lock);
+ switch (which) {
+ case PRIO_PROCESS:
+ if (who)
+ p = find_task_by_vpid(who);
+ else
+ p = current;
+ if (p) {
+ niceval = 20 - task_nice(p);
+ if (niceval > retval)
+ retval = niceval;
+ }
+ break;
+ case PRIO_PGRP:
+ 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_pid_thread(pgrp, PIDTYPE_PGID, p);
+ break;
+ case PRIO_USER:
+ user = (struct user_struct *) cred->user;
+ if (!who)
+ who = cred->uid;
+ else if ((who != cred->uid) &&
+ !(user = find_user(who)))
+ goto out_unlock; /* No processes for this user */
+
+ do_each_thread(g, p) {
+ if (__task_cred(p)->uid == who) {
+ niceval = 20 - task_nice(p);
+ if (niceval > retval)
+ retval = niceval;
+ }
+ } while_each_thread(g, p);
+ if (who != cred->uid)
+ free_uid(user); /* for find_user() */
+ break;
+ }
+out_unlock:
+ read_unlock(&tasklist_lock);
+ rcu_read_unlock();
+
+ 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)
+{
+ //kmsg_dump(KMSG_DUMP_EMERG);
+ machine_emergency_restart();
+}
+EXPORT_SYMBOL_GPL(emergency_restart);
+
+void kernel_restart_prepare(char *cmd)
+{
+ blocking_notifier_call_chain(&reboot_notifier_list, SYS_RESTART, cmd);
+ system_state = SYSTEM_RESTART;
+ usermodehelper_disable();
+ device_shutdown();
+}
+
+/**
+ * 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 blocking_notifier_chain_register()
+ * always returns zero.
+ */
+int register_reboot_notifier(struct notifier_block *nb)
+{
+ return blocking_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 blocking_notifier_chain_unregister(&reboot_notifier_list, nb);
+}
+EXPORT_SYMBOL(unregister_reboot_notifier);
+
+/* Add backwards compatibility for stable trees. */
+#ifndef PF_NO_SETAFFINITY
+#define PF_NO_SETAFFINITY PF_THREAD_BOUND
+#endif
+
+static void migrate_to_reboot_cpu(void)
+{
+ /* The boot cpu is always logical cpu 0 */
+ int cpu = 0;
+
+ cpu_hotplug_disable();
+
+ /* Make certain the cpu I'm about to reboot on is online */
+ if (!cpu_online(cpu))
+ cpu = cpumask_first(cpu_online_mask);
+
+ /* Prevent races with other tasks migrating this task */
+ current->flags |= PF_NO_SETAFFINITY;
+
+ /* Make certain I only run on the appropriate processor */
+ set_cpus_allowed_ptr(current, cpumask_of(cpu));
+}
+
+/**
+ * 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);
+ migrate_to_reboot_cpu();
+ syscore_shutdown();
+ if (!cmd)
+ printk(KERN_EMERG "Restarting system.\n");
+ else
+ printk(KERN_EMERG "Restarting system with command '%s'.\n", cmd);
+ kmsg_dump(KMSG_DUMP_RESTART);
+ machine_restart(cmd);
+}
+EXPORT_SYMBOL_GPL(kernel_restart);
+
+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;
+ usermodehelper_disable();
+ device_shutdown();
+}
+/**
+ * kernel_halt - halt the system
+ *
+ * Shutdown everything and perform a clean system halt.
+ */
+void kernel_halt(void)
+{
+ kernel_shutdown_prepare(SYSTEM_HALT);
+ migrate_to_reboot_cpu();
+ syscore_shutdown();
+ printk(KERN_EMERG "System halted.\n");
+ kmsg_dump(KMSG_DUMP_HALT);
+ 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);
+ if (pm_power_off_prepare)
+ pm_power_off_prepare();
+ migrate_to_reboot_cpu();
+ syscore_shutdown();
+ printk(KERN_EMERG "Power down.\n");
+ kmsg_dump(KMSG_DUMP_POWEROFF);
+ machine_power_off();
+}
+EXPORT_SYMBOL_GPL(kernel_power_off);
+
+static DEFINE_MUTEX(reboot_mutex);
+
+/*
+ * Reboot system call: for obvious reasons only root may call it,
+ * and even root needs to set up some magic numbers in the registers
+ * so that some mistake won't make this reboot the whole machine.
+ * You can also set the meaning of the ctrl-alt-del-key here.
+ *
+ * reboot doesn't sync: do that yourself before calling this.
+ */
+SYSCALL_DEFINE4(reboot, int, magic1, int, magic2, unsigned int, cmd,
+ void __user *, arg)
+{
+ char buffer[256];
+ int ret = 0;
+
+ /* We only trust the superuser with rebooting the system. */
+ if (!capable(CAP_SYS_BOOT))
+ return -EPERM;
+
+ /* For safety, we require "magic" arguments. */
+ if (magic1 != LINUX_REBOOT_MAGIC1 ||
+ (magic2 != LINUX_REBOOT_MAGIC2 &&
+ magic2 != LINUX_REBOOT_MAGIC2A &&
+ magic2 != LINUX_REBOOT_MAGIC2B &&
+ magic2 != LINUX_REBOOT_MAGIC2C))
+ return -EINVAL;
+
+ /*
+ * If pid namespaces are enabled and the current task is in a child
+ * pid_namespace, the command is handled by reboot_pid_ns() which will
+ * call do_exit().
+ */
+ ret = reboot_pid_ns(task_active_pid_ns(current), cmd);
+ if (ret)
+ return ret;
+
+ /* 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;
+
+ mutex_lock(&reboot_mutex);
+ switch (cmd) {
+ case LINUX_REBOOT_CMD_RESTART:
+ kernel_restart(NULL);
+ break;
+
+ case LINUX_REBOOT_CMD_CAD_ON:
+ C_A_D = 1;
+ break;
+
+ case LINUX_REBOOT_CMD_CAD_OFF:
+ C_A_D = 0;
+ break;
+
+ case LINUX_REBOOT_CMD_HALT:
+ kernel_halt();
+ do_exit(0);
+ panic("cannot halt");
+
+ case LINUX_REBOOT_CMD_POWER_OFF:
+ kernel_power_off();
+ do_exit(0);
+ break;
+
+ case LINUX_REBOOT_CMD_RESTART2:
+ if (strncpy_from_user(&buffer[0], arg, sizeof(buffer) - 1) < 0) {
+ ret = -EFAULT;
+ break;
+ }
+ buffer[sizeof(buffer) - 1] = '\0';
+
+ kernel_restart(buffer);
+ break;
+
+#ifdef CONFIG_KEXEC
+ case LINUX_REBOOT_CMD_KEXEC:
+ ret = kernel_kexec();
+ break;
+#endif
+
+#ifdef CONFIG_HIBERNATION
+ case LINUX_REBOOT_CMD_SW_SUSPEND:
+ ret = hibernate();
+ break;
+#endif
+
+ default:
+ ret = -EINVAL;
+ break;
+ }
+ mutex_unlock(&reboot_mutex);
+ return ret;
+}
+
+static void deferred_cad(struct work_struct *dummy)
+{
+ kernel_restart(NULL);
+}
+
+/*
+ * This function gets called by ctrl-alt-del - ie the keyboard interrupt.
+ * As it's called within an interrupt, it may NOT sync: the only choice
+ * is whether to reboot at once, or just ignore the ctrl-alt-del.
+ */
+void ctrl_alt_del(void)
+{
+ static DECLARE_WORK(cad_work, deferred_cad);
+
+ if (C_A_D)
+ schedule_work(&cad_work);
+ else
+ kill_cad_pid(SIGINT, 1);
+}
+
+/*
+ * Unprivileged users may change the real gid to the effective gid
+ * or vice versa. (BSD-style)
+ *
+ * If you set the real gid at all, or set the effective gid to a value not
+ * equal to the real gid, then the saved gid is set to the new effective gid.
+ *
+ * This makes it possible for a setgid program to completely drop its
+ * privileges, which is often a useful assertion to make when you are doing
+ * a security audit over a program.
+ *
+ * The general idea is that a program which uses just setregid() will be
+ * 100% compatible with BSD. A program which uses just setgid() will be
+ * 100% compatible with POSIX with saved IDs.
+ *
+ * SMP: There are not races, the GIDs are checked only by filesystem
+ * operations (as far as semantic preservation is concerned).
+ */
+SYSCALL_DEFINE2(setregid, gid_t, rgid, gid_t, egid)
+{
+ const struct cred *old;
+ struct cred *new;
+ int retval;
+
+ new = prepare_creds();
+ if (!new)
+ return -ENOMEM;
+ old = current_cred();
+
+ retval = -EPERM;
+ if (rgid != (gid_t) -1) {
+ if (old->gid == rgid ||
+ old->egid == rgid ||
+ nsown_capable(CAP_SETGID))
+ new->gid = rgid;
+ else
+ goto error;
+ }
+ if (egid != (gid_t) -1) {
+ if (old->gid == egid ||
+ old->egid == egid ||
+ old->sgid == egid ||
+ nsown_capable(CAP_SETGID))
+ new->egid = egid;
+ else
+ goto error;
+ }
+
+ if (rgid != (gid_t) -1 ||
+ (egid != (gid_t) -1 && egid != old->gid))
+ new->sgid = new->egid;
+ new->fsgid = new->egid;
+
+ return commit_creds(new);
+
+error:
+ abort_creds(new);
+ return retval;
+}
+
+/*
+ * setgid() is implemented like SysV w/ SAVED_IDS
+ *
+ * SMP: Same implicit races as above.
+ */
+SYSCALL_DEFINE1(setgid, gid_t, gid)
+{
+ const struct cred *old;
+ struct cred *new;
+ int retval;
+
+ new = prepare_creds();
+ if (!new)
+ return -ENOMEM;
+ old = current_cred();
+
+ retval = -EPERM;
+ if (nsown_capable(CAP_SETGID))
+ new->gid = new->egid = new->sgid = new->fsgid = gid;
+ else if (gid == old->gid || gid == old->sgid)
+ new->egid = new->fsgid = gid;
+ else
+ goto error;
+
+ return commit_creds(new);
+
+error:
+ abort_creds(new);
+ return retval;
+}
+
+/*
+ * change the user struct in a credentials set to match the new UID
+ */
+static int set_user(struct cred *new)
+{
+ struct user_struct *new_user;
+
+ new_user = alloc_uid(current_user_ns(), new->uid);
+ if (!new_user)
+ return -EAGAIN;
+
+ /*
+ * We don't fail in case of NPROC limit excess here because too many
+ * poorly written programs don't check set*uid() return code, assuming
+ * it never fails if called by root. We may still enforce NPROC limit
+ * for programs doing set*uid()+execve() by harmlessly deferring the
+ * failure to the execve() stage.
+ */
+ if (atomic_read(&new_user->processes) >= rlimit(RLIMIT_NPROC) &&
+ new_user != INIT_USER)
+ current->flags |= PF_NPROC_EXCEEDED;
+ else
+ current->flags &= ~PF_NPROC_EXCEEDED;
+
+ free_uid(new->user);
+ new->user = new_user;
+ return 0;
+}
+
+/*
+ * Unprivileged users may change the real uid to the effective uid
+ * or vice versa. (BSD-style)
+ *
+ * If you set the real uid at all, or set the effective uid to a value not
+ * equal to the real uid, then the saved uid is set to the new effective uid.
+ *
+ * This makes it possible for a setuid program to completely drop its
+ * privileges, which is often a useful assertion to make when you are doing
+ * a security audit over a program.
+ *
+ * The general idea is that a program which uses just setreuid() will be
+ * 100% compatible with BSD. A program which uses just setuid() will be
+ * 100% compatible with POSIX with saved IDs.
+ */
+SYSCALL_DEFINE2(setreuid, uid_t, ruid, uid_t, euid)
+{
+ const struct cred *old;
+ struct cred *new;
+ int retval;
+
+ new = prepare_creds();
+ if (!new)
+ return -ENOMEM;
+ old = current_cred();
+
+ retval = -EPERM;
+ if (ruid != (uid_t) -1) {
+ new->uid = ruid;
+ if (old->uid != ruid &&
+ old->euid != ruid &&
+ !nsown_capable(CAP_SETUID))
+ goto error;
+ }
+
+ if (euid != (uid_t) -1) {
+ new->euid = euid;
+ if (old->uid != euid &&
+ old->euid != euid &&
+ old->suid != euid &&
+ !nsown_capable(CAP_SETUID))
+ goto error;
+ }
+
+ if (new->uid != old->uid) {
+ retval = set_user(new);
+ if (retval < 0)
+ goto error;
+ }
+ if (ruid != (uid_t) -1 ||
+ (euid != (uid_t) -1 && euid != old->uid))
+ new->suid = new->euid;
+ new->fsuid = new->euid;
+
+ retval = security_task_fix_setuid(new, old, LSM_SETID_RE);
+ if (retval < 0)
+ goto error;
+
+ return commit_creds(new);
+
+error:
+ abort_creds(new);
+ return retval;
+}
+
+/*
+ * setuid() is implemented like SysV with SAVED_IDS
+ *
+ * Note that SAVED_ID's is deficient in that a setuid root program
+ * like sendmail, for example, cannot set its uid to be a normal
+ * user and then switch back, because if you're root, setuid() sets
+ * the saved uid too. If you don't like this, blame the bright people
+ * in the POSIX committee and/or USG. Note that the BSD-style setreuid()
+ * will allow a root program to temporarily drop privileges and be able to
+ * regain them by swapping the real and effective uid.
+ */
+SYSCALL_DEFINE1(setuid, uid_t, uid)
+{
+ const struct cred *old;
+ struct cred *new;
+ int retval;
+
+ new = prepare_creds();
+ if (!new)
+ return -ENOMEM;
+ old = current_cred();
+
+ retval = -EPERM;
+ if (nsown_capable(CAP_SETUID)) {
+ new->suid = new->uid = uid;
+ if (uid != old->uid) {
+ retval = set_user(new);
+ if (retval < 0)
+ goto error;
+ }
+ } else if (uid != old->uid && uid != new->suid) {
+ goto error;
+ }
+
+ new->fsuid = new->euid = uid;
+
+ retval = security_task_fix_setuid(new, old, LSM_SETID_ID);
+ if (retval < 0)
+ goto error;
+
+ return commit_creds(new);
+
+error:
+ abort_creds(new);
+ return retval;
+}
+
+
+/*
+ * This function implements a generic ability to update ruid, euid,
+ * and suid. This allows you to implement the 4.4 compatible seteuid().
+ */
+SYSCALL_DEFINE3(setresuid, uid_t, ruid, uid_t, euid, uid_t, suid)
+{
+ const struct cred *old;
+ struct cred *new;
+ int retval;
+
+ new = prepare_creds();
+ if (!new)
+ return -ENOMEM;
+
+ old = current_cred();
+
+ retval = -EPERM;
+ if (!nsown_capable(CAP_SETUID)) {
+ if (ruid != (uid_t) -1 && ruid != old->uid &&
+ ruid != old->euid && ruid != old->suid)
+ goto error;
+ if (euid != (uid_t) -1 && euid != old->uid &&
+ euid != old->euid && euid != old->suid)
+ goto error;
+ if (suid != (uid_t) -1 && suid != old->uid &&
+ suid != old->euid && suid != old->suid)
+ goto error;
+ }
+
+ if (ruid != (uid_t) -1) {
+ new->uid = ruid;
+ if (ruid != old->uid) {
+ retval = set_user(new);
+ if (retval < 0)
+ goto error;
+ }
+ }
+ if (euid != (uid_t) -1)
+ new->euid = euid;
+ if (suid != (uid_t) -1)
+ new->suid = suid;
+ new->fsuid = new->euid;
+
+ retval = security_task_fix_setuid(new, old, LSM_SETID_RES);
+ if (retval < 0)
+ goto error;
+
+ return commit_creds(new);
+
+error:
+ abort_creds(new);
+ return retval;
+}
+
+SYSCALL_DEFINE3(getresuid, uid_t __user *, ruid, uid_t __user *, euid, uid_t __user *, suid)
+{
+ const struct cred *cred = current_cred();
+ int retval;
+
+ if (!(retval = put_user(cred->uid, ruid)) &&
+ !(retval = put_user(cred->euid, euid)))
+ retval = put_user(cred->suid, suid);
+
+ return retval;
+}
+
+/*
+ * Same as above, but for rgid, egid, sgid.
+ */
+SYSCALL_DEFINE3(setresgid, gid_t, rgid, gid_t, egid, gid_t, sgid)
+{
+ const struct cred *old;
+ struct cred *new;
+ int retval;
+
+ new = prepare_creds();
+ if (!new)
+ return -ENOMEM;
+ old = current_cred();
+
+ retval = -EPERM;
+ if (!nsown_capable(CAP_SETGID)) {
+ if (rgid != (gid_t) -1 && rgid != old->gid &&
+ rgid != old->egid && rgid != old->sgid)
+ goto error;
+ if (egid != (gid_t) -1 && egid != old->gid &&
+ egid != old->egid && egid != old->sgid)
+ goto error;
+ if (sgid != (gid_t) -1 && sgid != old->gid &&
+ sgid != old->egid && sgid != old->sgid)
+ goto error;
+ }
+
+ if (rgid != (gid_t) -1)
+ new->gid = rgid;
+ if (egid != (gid_t) -1)
+ new->egid = egid;
+ if (sgid != (gid_t) -1)
+ new->sgid = sgid;
+ new->fsgid = new->egid;
+
+ return commit_creds(new);
+
+error:
+ abort_creds(new);
+ return retval;
+}
+
+SYSCALL_DEFINE3(getresgid, gid_t __user *, rgid, gid_t __user *, egid, gid_t __user *, sgid)
+{
+ const struct cred *cred = current_cred();
+ int retval;
+
+ if (!(retval = put_user(cred->gid, rgid)) &&
+ !(retval = put_user(cred->egid, egid)))
+ retval = put_user(cred->sgid, sgid);
+
+ return retval;
+}
+
+
+/*
+ * "setfsuid()" sets the fsuid - the uid used for filesystem checks. This
+ * is used for "access()" and for the NFS daemon (letting nfsd stay at
+ * whatever uid it wants to). It normally shadows "euid", except when
+ * explicitly set by setfsuid() or for access..
+ */
+SYSCALL_DEFINE1(setfsuid, uid_t, uid)
+{
+ const struct cred *old;
+ struct cred *new;
+ uid_t old_fsuid;
+
+ new = prepare_creds();
+ if (!new)
+ return current_fsuid();
+ old = current_cred();
+ old_fsuid = old->fsuid;
+
+ if (uid == old->uid || uid == old->euid ||
+ uid == old->suid || uid == old->fsuid ||
+ nsown_capable(CAP_SETUID)) {
+ if (uid != old_fsuid) {
+ new->fsuid = uid;
+ if (security_task_fix_setuid(new, old, LSM_SETID_FS) == 0)
+ goto change_okay;
+ }
+ }
+
+ abort_creds(new);
+ return old_fsuid;
+
+change_okay:
+ commit_creds(new);
+ return old_fsuid;
+}
+
+/*
+ * Samma på svenska..
+ */
+SYSCALL_DEFINE1(setfsgid, gid_t, gid)
+{
+ const struct cred *old;
+ struct cred *new;
+ gid_t old_fsgid;
+
+ new = prepare_creds();
+ if (!new)
+ return current_fsgid();
+ old = current_cred();
+ old_fsgid = old->fsgid;
+
+ if (gid == old->gid || gid == old->egid ||
+ gid == old->sgid || gid == old->fsgid ||
+ nsown_capable(CAP_SETGID)) {
+ if (gid != old_fsgid) {
+ new->fsgid = gid;
+ goto change_okay;
+ }
+ }
+
+ abort_creds(new);
+ return old_fsgid;
+
+change_okay:
+ commit_creds(new);
+ return old_fsgid;
+}
+
+void do_sys_times(struct tms *tms)
+{
+ cputime_t tgutime, tgstime, cutime, cstime;
+
+ spin_lock_irq(¤t->sighand->siglock);
+ thread_group_times(current, &tgutime, &tgstime);
+ cutime = current->signal->cutime;
+ cstime = current->signal->cstime;
+ spin_unlock_irq(¤t->sighand->siglock);
+ tms->tms_utime = cputime_to_clock_t(tgutime);
+ tms->tms_stime = cputime_to_clock_t(tgstime);
+ tms->tms_cutime = cputime_to_clock_t(cutime);
+ tms->tms_cstime = cputime_to_clock_t(cstime);
+}
+
+SYSCALL_DEFINE1(times, struct tms __user *, tbuf)
+{
+ if (tbuf) {
+ struct tms tmp;
+
+ do_sys_times(&tmp);
+ if (copy_to_user(tbuf, &tmp, sizeof(struct tms)))
+ return -EFAULT;
+ }
+ force_successful_syscall_return();
+ return (long) jiffies_64_to_clock_t(get_jiffies_64());
+}
+
+/*
+ * This needs some heavy checking ...
+ * I just haven't the stomach for it. I also don't fully
+ * understand sessions/pgrp etc. Let somebody who does explain it.
+ *
+ * OK, I think I have the protection semantics right.... this is really
+ * only important on a multi-user system anyway, to make sure one user
+ * can't send a signal to a process owned by another. -TYT, 12/12/91
+ *
+ * Auch. Had to add the 'did_exec' flag to conform completely to POSIX.
+ * LBT 04.03.94
+ */
+SYSCALL_DEFINE2(setpgid, pid_t, pid, pid_t, pgid)
+{
+ struct task_struct *p;
+ struct task_struct *group_leader = current->group_leader;
+ struct pid *pgrp;
+ int err;
+
+ if (!pid)
+ pid = task_pid_vnr(group_leader);
+ if (!pgid)
+ pgid = pid;
+ if (pgid < 0)
+ return -EINVAL;
+ rcu_read_lock();
+
+ /* From this point forward we keep holding onto the tasklist lock
+ * so that our parent does not change from under us. -DaveM
+ */
+ write_lock_irq(&tasklist_lock);
+
+ err = -ESRCH;
+ p = find_task_by_vpid(pid);
+ if (!p)
+ goto out;
+
+ err = -EINVAL;
+ if (!thread_group_leader(p))
+ goto out;
+
+ if (same_thread_group(p->real_parent, group_leader)) {
+ err = -EPERM;
+ if (task_session(p) != task_session(group_leader))
+ goto out;
+ err = -EACCES;
+ if (p->did_exec)
+ goto out;
+ } else {
+ err = -ESRCH;
+ if (p != group_leader)
+ goto out;
+ }
+
+ err = -EPERM;
+ if (p->signal->leader)
+ goto out;
+
+ pgrp = task_pid(p);
+ if (pgid != pid) {
+ struct task_struct *g;
+
+ pgrp = find_vpid(pgid);
+ g = pid_task(pgrp, PIDTYPE_PGID);
+ if (!g || task_session(g) != task_session(group_leader))
+ goto out;
+ }
+
+ err = security_task_setpgid(p, pgid);
+ if (err)
+ goto out;
+
+ if (task_pgrp(p) != pgrp)
+ change_pid(p, PIDTYPE_PGID, pgrp);
+
+ err = 0;
+out:
+ /* All paths lead to here, thus we are safe. -DaveM */
+ write_unlock_irq(&tasklist_lock);
+ rcu_read_unlock();
+ return err;
+}
+
+SYSCALL_DEFINE1(getpgid, pid_t, pid)
+{
+ struct task_struct *p;
+ struct pid *grp;
+ int retval;
+
+ rcu_read_lock();
+ if (!pid)
+ grp = task_pgrp(current);
+ else {
+ retval = -ESRCH;
+ 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
+
+SYSCALL_DEFINE0(getpgrp)
+{
+ return sys_getpgid(0);
+}
+
+#endif
+
+SYSCALL_DEFINE1(getsid, pid_t, pid)
+{
+ struct task_struct *p;
+ struct pid *sid;
+ int retval;
+
+ rcu_read_lock();
+ if (!pid)
+ sid = task_session(current);
+ else {
+ retval = -ESRCH;
+ 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;
+}
+
+SYSCALL_DEFINE0(setsid)
+{
+ struct task_struct *group_leader = current->group_leader;
+ struct pid *sid = task_pid(group_leader);
+ pid_t session = pid_vnr(sid);
+ int err = -EPERM;
+
+ write_lock_irq(&tasklist_lock);
+ /* Fail if I am already a session leader */
+ if (group_leader->signal->leader)
+ goto out;
+
+ /* 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(sid);
+
+ proc_clear_tty(group_leader);
+
+ err = session;
+out:
+ write_unlock_irq(&tasklist_lock);
+ if (err > 0) {
+ proc_sid_connector(group_leader);
+ sched_autogroup_create_attach(group_leader);
+ }
+ return err;
+}
+
+DECLARE_RWSEM(uts_sem);
+
+#ifdef COMPAT_UTS_MACHINE
+#define override_architecture(name) \
+ (personality(current->personality) == PER_LINUX32 && \
+ copy_to_user(name->machine, COMPAT_UTS_MACHINE, \
+ sizeof(COMPAT_UTS_MACHINE)))
+#else
+#define override_architecture(name) 0
+#endif
+
+/*
+ * Work around broken programs that cannot handle "Linux 3.0".
+ * Instead we map 3.x to 2.6.40+x, so e.g. 3.0 would be 2.6.40
+ */
+static int override_release(char __user *release, size_t len)
+{
+ int ret = 0;
+
+ if (current->personality & UNAME26) {
+ const char *rest = UTS_RELEASE;
+ char buf[65] = { 0 };
+ int ndots = 0;
+ unsigned v;
+ size_t copy;
+
+ while (*rest) {
+ if (*rest == '.' && ++ndots >= 3)
+ break;
+ if (!isdigit(*rest) && *rest != '.')
+ break;
+ rest++;
+ }
+ v = ((LINUX_VERSION_CODE >> 8) & 0xff) + 40;
+ copy = clamp_t(size_t, len, 1, sizeof(buf));
+ copy = scnprintf(buf, copy, "2.6.%u%s", v, rest);
+ ret = copy_to_user(release, buf, copy + 1);
+ }
+ return ret;
+}
+
+SYSCALL_DEFINE1(newuname, struct new_utsname __user *, name)
+{
+ int errno = 0;
+
+ down_read(&uts_sem);
+ if (copy_to_user(name, utsname(), sizeof *name))
+ errno = -EFAULT;
+ up_read(&uts_sem);
+
+ if (!errno && override_release(name->release, sizeof(name->release)))
+ errno = -EFAULT;
+ if (!errno && override_architecture(name))
+ errno = -EFAULT;
+ return errno;
+}
+
+#ifdef __ARCH_WANT_SYS_OLD_UNAME
+/*
+ * Old cruft
+ */
+SYSCALL_DEFINE1(uname, struct old_utsname __user *, name)
+{
+ int error = 0;
+
+ if (!name)
+ return -EFAULT;
+
+ down_read(&uts_sem);
+ if (copy_to_user(name, utsname(), sizeof(*name)))
+ error = -EFAULT;
+ up_read(&uts_sem);
+
+ if (!error && override_release(name->release, sizeof(name->release)))
+ error = -EFAULT;
+ if (!error && override_architecture(name))
+ error = -EFAULT;
+ return error;
+}
+
+SYSCALL_DEFINE1(olduname, struct oldold_utsname __user *, name)
+{
+ int error;
+
+ if (!name)
+ return -EFAULT;
+ if (!access_ok(VERIFY_WRITE, name, sizeof(struct oldold_utsname)))
+ return -EFAULT;
+
+ down_read(&uts_sem);
+ error = __copy_to_user(&name->sysname, &utsname()->sysname,
+ __OLD_UTS_LEN);
+ error |= __put_user(0, name->sysname + __OLD_UTS_LEN);
+ error |= __copy_to_user(&name->nodename, &utsname()->nodename,
+ __OLD_UTS_LEN);
+ error |= __put_user(0, name->nodename + __OLD_UTS_LEN);
+ error |= __copy_to_user(&name->release, &utsname()->release,
+ __OLD_UTS_LEN);
+ error |= __put_user(0, name->release + __OLD_UTS_LEN);
+ error |= __copy_to_user(&name->version, &utsname()->version,
+ __OLD_UTS_LEN);
+ error |= __put_user(0, name->version + __OLD_UTS_LEN);
+ error |= __copy_to_user(&name->machine, &utsname()->machine,
+ __OLD_UTS_LEN);
+ error |= __put_user(0, name->machine + __OLD_UTS_LEN);
+ up_read(&uts_sem);
+
+ if (!error && override_architecture(name))
+ error = -EFAULT;
+ if (!error && override_release(name->release, sizeof(name->release)))
+ error = -EFAULT;
+ return error ? -EFAULT : 0;
+}
+#endif
+
+SYSCALL_DEFINE2(sethostname, char __user *, name, int, len)
+{
+ int errno;
+ char tmp[__NEW_UTS_LEN];
+
+ if (!ns_capable(current->nsproxy->uts_ns->user_ns, CAP_SYS_ADMIN))
+ return -EPERM;
+
+ if (len < 0 || len > __NEW_UTS_LEN)
+ return -EINVAL;
+ down_write(&uts_sem);
+ errno = -EFAULT;
+ if (!copy_from_user(tmp, name, len)) {
+ struct new_utsname *u = utsname();
+
+ memcpy(u->nodename, tmp, len);
+ memset(u->nodename + len, 0, sizeof(u->nodename) - len);
+ errno = 0;
+ }
+ uts_proc_notify(UTS_PROC_HOSTNAME);
+ up_write(&uts_sem);
+ return errno;
+}
+
+#ifdef __ARCH_WANT_SYS_GETHOSTNAME
+
+SYSCALL_DEFINE2(gethostname, char __user *, name, int, len)
+{
+ int i, errno;
+ struct new_utsname *u;
+
+ if (len < 0)
+ return -EINVAL;
+ down_read(&uts_sem);
+ u = utsname();
+ i = 1 + strlen(u->nodename);
+ if (i > len)
+ i = len;
+ errno = 0;
+ if (copy_to_user(name, u->nodename, i))
+ errno = -EFAULT;
+ up_read(&uts_sem);
+ return errno;
+}
+
+#endif
+
+/*
+ * Only setdomainname; getdomainname can be implemented by calling
+ * uname()
+ */
+SYSCALL_DEFINE2(setdomainname, char __user *, name, int, len)
+{
+ int errno;
+ char tmp[__NEW_UTS_LEN];
+
+ if (!ns_capable(current->nsproxy->uts_ns->user_ns, CAP_SYS_ADMIN))
+ return -EPERM;
+ if (len < 0 || len > __NEW_UTS_LEN)
+ return -EINVAL;
+
+ down_write(&uts_sem);
+ errno = -EFAULT;
+ if (!copy_from_user(tmp, name, len)) {
+ struct new_utsname *u = utsname();
+
+ memcpy(u->domainname, tmp, len);
+ memset(u->domainname + len, 0, sizeof(u->domainname) - len);
+ errno = 0;
+ }
+ uts_proc_notify(UTS_PROC_DOMAINNAME);
+ up_write(&uts_sem);
+ return errno;
+}
+
+SYSCALL_DEFINE2(getrlimit, unsigned int, resource, struct rlimit __user *, rlim)
+{
+ struct rlimit value;
+ int ret;
+
+ ret = do_prlimit(current, resource, NULL, &value);
+ if (!ret)
+ ret = copy_to_user(rlim, &value, sizeof(*rlim)) ? -EFAULT : 0;
+
+ return ret;
+}
+
+#ifdef __ARCH_WANT_SYS_OLD_GETRLIMIT
+
+/*
+ * Back compatibility for getrlimit. Needed for some apps.
+ */
+
+SYSCALL_DEFINE2(old_getrlimit, unsigned int, resource,
+ struct rlimit __user *, rlim)
+{
+ struct rlimit x;
+ if (resource >= RLIM_NLIMITS)
+ return -EINVAL;
+
+ task_lock(current->group_leader);
+ x = current->signal->rlim[resource];
+ task_unlock(current->group_leader);
+ if (x.rlim_cur > 0x7FFFFFFF)
+ x.rlim_cur = 0x7FFFFFFF;
+ if (x.rlim_max > 0x7FFFFFFF)
+ x.rlim_max = 0x7FFFFFFF;
+ return copy_to_user(rlim, &x, sizeof(x))?-EFAULT:0;
+}
+
+#endif
+
+static inline bool rlim64_is_infinity(__u64 rlim64)
+{
+#if BITS_PER_LONG < 64
+ return rlim64 >= ULONG_MAX;
+#else
+ return rlim64 == RLIM64_INFINITY;
+#endif
+}
+
+static void rlim_to_rlim64(const struct rlimit *rlim, struct rlimit64 *rlim64)
+{
+ if (rlim->rlim_cur == RLIM_INFINITY)
+ rlim64->rlim_cur = RLIM64_INFINITY;
+ else
+ rlim64->rlim_cur = rlim->rlim_cur;
+ if (rlim->rlim_max == RLIM_INFINITY)
+ rlim64->rlim_max = RLIM64_INFINITY;
+ else
+ rlim64->rlim_max = rlim->rlim_max;
+}
+
+static void rlim64_to_rlim(const struct rlimit64 *rlim64, struct rlimit *rlim)
+{
+ if (rlim64_is_infinity(rlim64->rlim_cur))
+ rlim->rlim_cur = RLIM_INFINITY;
+ else
+ rlim->rlim_cur = (unsigned long)rlim64->rlim_cur;
+ if (rlim64_is_infinity(rlim64->rlim_max))
+ rlim->rlim_max = RLIM_INFINITY;
+ else
+ rlim->rlim_max = (unsigned long)rlim64->rlim_max;
+}
+
+/* make sure you are allowed to change @tsk limits before calling this */
+int do_prlimit(struct task_struct *tsk, unsigned int resource,
+ struct rlimit *new_rlim, struct rlimit *old_rlim)
+{
+ struct rlimit *rlim;
+ int retval = 0;
+
+ if (resource >= RLIM_NLIMITS)
+ return -EINVAL;
+ if (new_rlim) {
+ if (new_rlim->rlim_cur > new_rlim->rlim_max)
+ return -EINVAL;
+ if (resource == RLIMIT_NOFILE &&
+ new_rlim->rlim_max > sysctl_nr_open)
+ return -EPERM;
+ }
+
+ /* protect tsk->signal and tsk->sighand from disappearing */
+ read_lock(&tasklist_lock);
+ if (!tsk->sighand) {
+ retval = -ESRCH;
+ goto out;
+ }
+
+ rlim = tsk->signal->rlim + resource;
+ task_lock(tsk->group_leader);
+ if (new_rlim) {
+ /* Keep the capable check against init_user_ns until
+ cgroups can contain all limits */
+ if (new_rlim->rlim_max > rlim->rlim_max &&
+ !capable(CAP_SYS_RESOURCE))
+ retval = -EPERM;
+ if (!retval)
+ retval = security_task_setrlimit(tsk->group_leader,
+ resource, new_rlim);
+ 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;
+ }
+ }
+ if (!retval) {
+ if (old_rlim)
+ *old_rlim = *rlim;
+ if (new_rlim)
+ *rlim = *new_rlim;
+ }
+ task_unlock(tsk->group_leader);
+
+ /*
+ * 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 (!retval && new_rlim && resource == RLIMIT_CPU &&
+ new_rlim->rlim_cur != RLIM_INFINITY)
+ update_rlimit_cpu(tsk, new_rlim->rlim_cur);
+out:
+ read_unlock(&tasklist_lock);
+ return retval;
+}
+
+/* rcu lock must be held */
+static int check_prlimit_permission(struct task_struct *task)
+{
+ const struct cred *cred = current_cred(), *tcred;
+
+ if (current == task)
+ return 0;
+
+ tcred = __task_cred(task);
+ if (cred->user->user_ns == tcred->user->user_ns &&
+ (cred->uid == tcred->euid &&
+ cred->uid == tcred->suid &&
+ cred->uid == tcred->uid &&
+ cred->gid == tcred->egid &&
+ cred->gid == tcred->sgid &&
+ cred->gid == tcred->gid))
+ return 0;
+ if (ns_capable(tcred->user->user_ns, CAP_SYS_RESOURCE))
+ return 0;
+
+ return -EPERM;
+}
+
+SYSCALL_DEFINE4(prlimit64, pid_t, pid, unsigned int, resource,
+ const struct rlimit64 __user *, new_rlim,
+ struct rlimit64 __user *, old_rlim)
+{
+ struct rlimit64 old64, new64;
+ struct rlimit old, new;
+ struct task_struct *tsk;
+ int ret;
+
+ if (new_rlim) {
+ if (copy_from_user(&new64, new_rlim, sizeof(new64)))
+ return -EFAULT;
+ rlim64_to_rlim(&new64, &new);
+ }
+
+ rcu_read_lock();
+ tsk = pid ? find_task_by_vpid(pid) : current;
+ if (!tsk) {
+ rcu_read_unlock();
+ return -ESRCH;
+ }
+ ret = check_prlimit_permission(tsk);
+ if (ret) {
+ rcu_read_unlock();
+ return ret;
+ }
+ get_task_struct(tsk);
+ rcu_read_unlock();
+
+ ret = do_prlimit(tsk, resource, new_rlim ? &new : NULL,
+ old_rlim ? &old : NULL);
+
+ if (!ret && old_rlim) {
+ rlim_to_rlim64(&old, &old64);
+ if (copy_to_user(old_rlim, &old64, sizeof(old64)))
+ ret = -EFAULT;
+ }
+
+ put_task_struct(tsk);
+ return ret;
+}
+
+SYSCALL_DEFINE2(setrlimit, unsigned int, resource, struct rlimit __user *, rlim)
+{
+ struct rlimit new_rlim;
+
+ if (copy_from_user(&new_rlim, rlim, sizeof(*rlim)))
+ return -EFAULT;
+ return do_prlimit(current, resource, &new_rlim, NULL);
+}
+
+/*
+ * It would make sense to put struct rusage in the task_struct,
+ * except that would make the task_struct be *really big*. After
+ * task_struct gets moved into malloc'ed memory, it would
+ * make sense to do this. It will make moving the rest of the information
+ * a lot simpler! (Which we're not doing right now because we're not
+ * measuring them yet).
+ *
+ * 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
+ * care which for the sums. We always take the siglock to protect reading
+ * 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)
+{
+ 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 tgutime, tgstime, utime, stime;
+ unsigned long maxrss = 0;
+
+ memset((char *) r, 0, sizeof *r);
+ utime = stime = 0;
+
+ if (who == RUSAGE_THREAD) {
+ task_times(current, &utime, &stime);
+ accumulate_thread_rusage(p, r);
+ maxrss = p->signal->maxrss;
+ goto out;
+ }
+
+ if (!lock_task_sighand(p, &flags))
+ return;
+
+ switch (who) {
+ case RUSAGE_BOTH:
+ case RUSAGE_CHILDREN:
+ 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;
+ r->ru_inblock = p->signal->cinblock;
+ r->ru_oublock = p->signal->coublock;
+ maxrss = p->signal->cmaxrss;
+
+ if (who == RUSAGE_CHILDREN)
+ break;
+
+ case RUSAGE_SELF:
+ thread_group_times(p, &tgutime, &tgstime);
+ utime += tgutime;
+ stime += tgstime;
+ 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;
+ if (maxrss < p->signal->maxrss)
+ maxrss = p->signal->maxrss;
+ t = p;
+ do {
+ accumulate_thread_rusage(t, r);
+ t = next_thread(t);
+ } while (t != p);
+ break;
+
+ default:
+ BUG();
+ }
+ unlock_task_sighand(p, &flags);
+
+out:
+ cputime_to_timeval(utime, &r->ru_utime);
+ cputime_to_timeval(stime, &r->ru_stime);
+
+ if (who != RUSAGE_CHILDREN) {
+ struct mm_struct *mm = get_task_mm(p);
+ if (mm) {
+ setmax_mm_hiwater_rss(&maxrss, mm);
+ mmput(mm);
+ }
+ }
+ r->ru_maxrss = maxrss * (PAGE_SIZE / 1024); /* convert pages to KBs */
+}
+
+int getrusage(struct task_struct *p, int who, struct rusage __user *ru)
+{
+ struct rusage r;
+ k_getrusage(p, who, &r);
+ return copy_to_user(ru, &r, sizeof(r)) ? -EFAULT : 0;
+}
+
+SYSCALL_DEFINE2(getrusage, int, who, struct rusage __user *, ru)
+{
+ if (who != RUSAGE_SELF && who != RUSAGE_CHILDREN &&
+ who != RUSAGE_THREAD)
+ return -EINVAL;
+ return getrusage(current, who, ru);
+}
+
+SYSCALL_DEFINE1(umask, int, mask)
+{
+ mask = xchg(¤t->fs->umask, mask & S_IRWXUGO);
+ return mask;
+}
+
+#ifdef CONFIG_CHECKPOINT_RESTORE
+static int prctl_set_mm(int opt, unsigned long addr,
+ unsigned long arg4, unsigned long arg5)
+{
+ unsigned long rlim = rlimit(RLIMIT_DATA);
+ unsigned long vm_req_flags;
+ unsigned long vm_bad_flags;
+ struct vm_area_struct *vma;
+ int error = 0;
+ struct mm_struct *mm = current->mm;
+
+ if (arg4 | arg5)
+ return -EINVAL;
+
+ if (!capable(CAP_SYS_RESOURCE))
+ return -EPERM;
+
+ if (addr >= TASK_SIZE)
+ return -EINVAL;
+
+ down_read(&mm->mmap_sem);
+ vma = find_vma(mm, addr);
+
+ if (opt != PR_SET_MM_START_BRK && opt != PR_SET_MM_BRK) {
+ /* It must be existing VMA */
+ if (!vma || vma->vm_start > addr)
+ goto out;
+ }
+
+ error = -EINVAL;
+ switch (opt) {
+ case PR_SET_MM_START_CODE:
+ case PR_SET_MM_END_CODE:
+ vm_req_flags = VM_READ | VM_EXEC;
+ vm_bad_flags = VM_WRITE | VM_MAYSHARE;
+
+ if ((vma->vm_flags & vm_req_flags) != vm_req_flags ||
+ (vma->vm_flags & vm_bad_flags))
+ goto out;
+
+ if (opt == PR_SET_MM_START_CODE)
+ mm->start_code = addr;
+ else
+ mm->end_code = addr;
+ break;
+
+ case PR_SET_MM_START_DATA:
+ case PR_SET_MM_END_DATA:
+ vm_req_flags = VM_READ | VM_WRITE;
+ vm_bad_flags = VM_EXEC | VM_MAYSHARE;
+
+ if ((vma->vm_flags & vm_req_flags) != vm_req_flags ||
+ (vma->vm_flags & vm_bad_flags))
+ goto out;
+
+ if (opt == PR_SET_MM_START_DATA)
+ mm->start_data = addr;
+ else
+ mm->end_data = addr;
+ break;
+
+ case PR_SET_MM_START_STACK:
+
+#ifdef CONFIG_STACK_GROWSUP
+ vm_req_flags = VM_READ | VM_WRITE | VM_GROWSUP;
+#else
+ vm_req_flags = VM_READ | VM_WRITE | VM_GROWSDOWN;
+#endif
+ if ((vma->vm_flags & vm_req_flags) != vm_req_flags)
+ goto out;
+
+ mm->start_stack = addr;
+ break;
+
+ case PR_SET_MM_START_BRK:
+ if (addr <= mm->end_data)
+ goto out;
+
+ if (rlim < RLIM_INFINITY &&
+ (mm->brk - addr) +
+ (mm->end_data - mm->start_data) > rlim)
+ goto out;
+
+ mm->start_brk = addr;
+ break;
+
+ case PR_SET_MM_BRK:
+ if (addr <= mm->end_data)
+ goto out;
+
+ if (rlim < RLIM_INFINITY &&
+ (addr - mm->start_brk) +
+ (mm->end_data - mm->start_data) > rlim)
+ goto out;
+
+ mm->brk = addr;
+ break;
+
+ default:
+ error = -EINVAL;
+ goto out;
+ }
+
+ error = 0;
+
+out:
+ up_read(&mm->mmap_sem);
+
+ return error;
+}
+#else /* CONFIG_CHECKPOINT_RESTORE */
+static int prctl_set_mm(int opt, unsigned long addr,
+ unsigned long arg4, unsigned long arg5)
+{
+ return -EINVAL;
+}
+#endif
+
+SYSCALL_DEFINE5(prctl, int, option, unsigned long, arg2, unsigned long, arg3,
+ unsigned long, arg4, unsigned long, arg5)
+{
+ struct task_struct *me = current;
+ unsigned char comm[sizeof(me->comm)];
+ long error;
+
+ error = security_task_prctl(option, arg2, arg3, arg4, arg5);
+ if (error != -ENOSYS)
+ return error;
+
+ error = 0;
+ switch (option) {
+ case PR_SET_PDEATHSIG:
+ if (!valid_signal(arg2)) {
+ error = -EINVAL;
+ break;
+ }
+ me->pdeath_signal = arg2;
+ error = 0;
+ break;
+ case PR_GET_PDEATHSIG:
+ error = put_user(me->pdeath_signal, (int __user *)arg2);
+ break;
+ case PR_GET_DUMPABLE:
+ error = get_dumpable(me->mm);
+ break;
+ case PR_SET_DUMPABLE:
+ if (arg2 < 0 || arg2 > 1) {
+ error = -EINVAL;
+ break;
+ }
+ set_dumpable(me->mm, arg2);
+ error = 0;
+ break;
+
+ case PR_SET_UNALIGN:
+ error = SET_UNALIGN_CTL(me, arg2);
+ break;
+ case PR_GET_UNALIGN:
+ error = GET_UNALIGN_CTL(me, arg2);
+ break;
+ case PR_SET_FPEMU:
+ error = SET_FPEMU_CTL(me, arg2);
+ break;
+ case PR_GET_FPEMU:
+ error = GET_FPEMU_CTL(me, arg2);
+ break;
+ case PR_SET_FPEXC:
+ error = SET_FPEXC_CTL(me, arg2);
+ break;
+ case PR_GET_FPEXC:
+ error = GET_FPEXC_CTL(me, arg2);
+ break;
+ case PR_GET_TIMING:
+ error = PR_TIMING_STATISTICAL;
+ break;
+ case PR_SET_TIMING:
+ if (arg2 != PR_TIMING_STATISTICAL)
+ error = -EINVAL;
+ else
+ error = 0;
+ break;
+
+ case PR_SET_NAME:
+ comm[sizeof(me->comm)-1] = 0;
+ if (strncpy_from_user(comm, (char __user *)arg2,
+ sizeof(me->comm) - 1) < 0)
+ return -EFAULT;
+ set_task_comm(me, comm);
+ proc_comm_connector(me);
+ return 0;
+ case PR_GET_NAME:
+ get_task_comm(comm, me);
+ if (copy_to_user((char __user *)arg2, comm,
+ sizeof(comm)))
+ return -EFAULT;
+ return 0;
+ case PR_GET_ENDIAN:
+ error = GET_ENDIAN(me, arg2);
+ break;
+ case PR_SET_ENDIAN:
+ error = SET_ENDIAN(me, 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_TASK_PERF_EVENTS_DISABLE:
+ error = perf_event_task_disable();
+ break;
+ case PR_TASK_PERF_EVENTS_ENABLE:
+ error = perf_event_task_enable();
+ 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;
+ error = 0;
+ break;
+ case PR_MCE_KILL:
+ if (arg4 | arg5)
+ return -EINVAL;
+ switch (arg2) {
+ case PR_MCE_KILL_CLEAR:
+ if (arg3 != 0)
+ return -EINVAL;
+ current->flags &= ~PF_MCE_PROCESS;
+ break;
+ case PR_MCE_KILL_SET:
+ current->flags |= PF_MCE_PROCESS;
+ if (arg3 == PR_MCE_KILL_EARLY)
+ current->flags |= PF_MCE_EARLY;
+ else if (arg3 == PR_MCE_KILL_LATE)
+ current->flags &= ~PF_MCE_EARLY;
+ else if (arg3 == PR_MCE_KILL_DEFAULT)
+ current->flags &=
+ ~(PF_MCE_EARLY|PF_MCE_PROCESS);
+ else
+ return -EINVAL;
+ break;
+ default:
+ return -EINVAL;
+ }
+ error = 0;
+ break;
+ case PR_MCE_KILL_GET:
+ if (arg2 | arg3 | arg4 | arg5)
+ return -EINVAL;
+ if (current->flags & PF_MCE_PROCESS)
+ error = (current->flags & PF_MCE_EARLY) ?
+ PR_MCE_KILL_EARLY : PR_MCE_KILL_LATE;
+ else
+ error = PR_MCE_KILL_DEFAULT;
+ break;
+ case PR_SET_MM:
+ error = prctl_set_mm(arg2, arg3, arg4, arg5);
+ break;
+ case PR_SET_CHILD_SUBREAPER:
+ me->signal->is_child_subreaper = !!arg2;
+ error = 0;
+ break;
+ case PR_GET_CHILD_SUBREAPER:
+ error = put_user(me->signal->is_child_subreaper,
+ (int __user *) arg2);
+ break;
+ default:
+ error = -EINVAL;
+ break;
+ }
+ return error;
+}
+
+SYSCALL_DEFINE3(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(struct subprocess_info *info)
+{
+ argv_free(info->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_setfns(info, NULL, argv_cleanup, NULL);
+
+ 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);