#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/syscore_ops.h>
#include <linux/version.h>
#include <linux/ctype.h>
+#include <linux/mm.h>
+#include <linux/mempolicy.h>
#include <linux/compat.h>
#include <linux/syscalls.h>
#include <asm/unistd.h>
#ifndef SET_UNALIGN_CTL
-# define SET_UNALIGN_CTL(a,b) (-EINVAL)
+# define SET_UNALIGN_CTL(a, b) (-EINVAL)
#endif
#ifndef GET_UNALIGN_CTL
-# define GET_UNALIGN_CTL(a,b) (-EINVAL)
+# define GET_UNALIGN_CTL(a, b) (-EINVAL)
#endif
#ifndef SET_FPEMU_CTL
-# define SET_FPEMU_CTL(a,b) (-EINVAL)
+# define SET_FPEMU_CTL(a, b) (-EINVAL)
#endif
#ifndef GET_FPEMU_CTL
-# define GET_FPEMU_CTL(a,b) (-EINVAL)
+# define GET_FPEMU_CTL(a, b) (-EINVAL)
#endif
#ifndef SET_FPEXC_CTL
-# define SET_FPEXC_CTL(a,b) (-EINVAL)
+# define SET_FPEXC_CTL(a, b) (-EINVAL)
#endif
#ifndef GET_FPEXC_CTL
-# define GET_FPEXC_CTL(a,b) (-EINVAL)
+# define GET_FPEXC_CTL(a, b) (-EINVAL)
#endif
#ifndef GET_ENDIAN
-# define GET_ENDIAN(a,b) (-EINVAL)
+# define GET_ENDIAN(a, b) (-EINVAL)
#endif
#ifndef SET_ENDIAN
-# define SET_ENDIAN(a,b) (-EINVAL)
+# define SET_ENDIAN(a, b) (-EINVAL)
#endif
#ifndef GET_TSC_CTL
# define GET_TSC_CTL(a) (-EINVAL)
#ifndef SET_TSC_CTL
# define SET_TSC_CTL(a) (-EINVAL)
#endif
+#ifndef MPX_ENABLE_MANAGEMENT
+# define MPX_ENABLE_MANAGEMENT() (-EINVAL)
+#endif
+#ifndef MPX_DISABLE_MANAGEMENT
+# define MPX_DISABLE_MANAGEMENT() (-EINVAL)
+#endif
+#ifndef GET_FP_MODE
+# define GET_FP_MODE(a) (-EINVAL)
+#endif
+#ifndef SET_FP_MODE
+# define SET_FP_MODE(a,b) (-EINVAL)
+#endif
/*
* this is where the system-wide overflow UID and GID are defined, for
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.
/* normalize: avoid signed division (rounding problems) */
error = -ESRCH;
- if (niceval < -20)
- niceval = -20;
- if (niceval > 19)
- niceval = 19;
+ if (niceval < MIN_NICE)
+ niceval = MIN_NICE;
+ if (niceval > MAX_NICE)
+ niceval = MAX_NICE;
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:
- uid = make_kuid(cred->user_ns, who);
- user = cred->user;
- if (!who)
- uid = cred->uid;
- else if (!uid_eq(uid, cred->uid) &&
- !(user = find_user(uid)))
+ 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:
+ uid = make_kuid(cred->user_ns, who);
+ user = cred->user;
+ if (!who)
+ uid = cred->uid;
+ else if (!uid_eq(uid, cred->uid)) {
+ user = find_user(uid);
+ if (!user)
goto out_unlock; /* No processes for this user */
-
- do_each_thread(g, p) {
- if (uid_eq(task_uid(p), uid))
- error = set_one_prio(p, niceval, error);
- } while_each_thread(g, p);
- if (!uid_eq(uid, cred->uid))
- free_uid(user); /* For find_user() */
- break;
+ }
+ do_each_thread(g, p) {
+ if (uid_eq(task_uid(p), uid) && task_pid_vnr(p))
+ error = set_one_prio(p, niceval, error);
+ } while_each_thread(g, p);
+ if (!uid_eq(uid, cred->uid))
+ free_uid(user); /* For find_user() */
+ break;
}
out_unlock:
read_unlock(&tasklist_lock);
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);
+ case PRIO_PROCESS:
+ if (who)
+ p = find_task_by_vpid(who);
+ else
+ p = current;
+ if (p) {
+ niceval = nice_to_rlimit(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 = nice_to_rlimit(task_nice(p));
+ if (niceval > retval)
+ retval = niceval;
+ } while_each_pid_thread(pgrp, PIDTYPE_PGID, p);
+ break;
+ case PRIO_USER:
+ uid = make_kuid(cred->user_ns, who);
+ user = cred->user;
+ if (!who)
+ uid = cred->uid;
+ else if (!uid_eq(uid, cred->uid)) {
+ user = find_user(uid);
+ if (!user)
+ goto out_unlock; /* No processes for this user */
+ }
+ do_each_thread(g, p) {
+ if (uid_eq(task_uid(p), uid) && task_pid_vnr(p)) {
+ niceval = nice_to_rlimit(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:
- uid = make_kuid(cred->user_ns, who);
- user = cred->user;
- if (!who)
- uid = cred->uid;
- else if (!uid_eq(uid, cred->uid) &&
- !(user = find_user(uid)))
- goto out_unlock; /* No processes for this user */
-
- do_each_thread(g, p) {
- if (uid_eq(task_uid(p), uid)) {
- niceval = 20 - task_nice(p);
- if (niceval > retval)
- retval = niceval;
- }
- } while_each_thread(g, p);
- if (!uid_eq(uid, cred->uid))
- free_uid(user); /* for find_user() */
- break;
+ } while_each_thread(g, p);
+ if (!uid_eq(uid, cred->uid))
+ free_uid(user); /* for find_user() */
+ break;
}
out_unlock:
read_unlock(&tasklist_lock);
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)
-{
- struct pid_namespace *pid_ns = task_active_pid_ns(current);
- char buffer[256];
- int ret = 0;
-
- /* We only trust the superuser with rebooting the system. */
- if (!ns_capable(pid_ns->user_ns, 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(pid_ns, 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)
*
* 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.
+ * 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).
*/
+#ifdef CONFIG_MULTIUSER
SYSCALL_DEFINE2(setregid, gid_t, rgid, gid_t, egid)
{
struct user_namespace *ns = current_user_ns();
if (rgid != (gid_t) -1) {
if (gid_eq(old->gid, krgid) ||
gid_eq(old->egid, krgid) ||
- nsown_capable(CAP_SETGID))
+ ns_capable(old->user_ns, CAP_SETGID))
new->gid = krgid;
else
goto error;
if (gid_eq(old->gid, kegid) ||
gid_eq(old->egid, kegid) ||
gid_eq(old->sgid, kegid) ||
- nsown_capable(CAP_SETGID))
+ ns_capable(old->user_ns, CAP_SETGID))
new->egid = kegid;
else
goto error;
}
/*
- * setgid() is implemented like SysV w/ SAVED_IDS
+ * setgid() is implemented like SysV w/ SAVED_IDS
*
* SMP: Same implicit races as above.
*/
old = current_cred();
retval = -EPERM;
- if (nsown_capable(CAP_SETGID))
+ if (ns_capable(old->user_ns, CAP_SETGID))
new->gid = new->egid = new->sgid = new->fsgid = kgid;
else if (gid_eq(kgid, old->gid) || gid_eq(kgid, old->sgid))
new->egid = new->fsgid = kgid;
*
* 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.
+ * 100% compatible with POSIX with saved IDs.
*/
SYSCALL_DEFINE2(setreuid, uid_t, ruid, uid_t, euid)
{
new->uid = kruid;
if (!uid_eq(old->uid, kruid) &&
!uid_eq(old->euid, kruid) &&
- !nsown_capable(CAP_SETUID))
+ !ns_capable(old->user_ns, CAP_SETUID))
goto error;
}
if (!uid_eq(old->uid, keuid) &&
!uid_eq(old->euid, keuid) &&
!uid_eq(old->suid, keuid) &&
- !nsown_capable(CAP_SETUID))
+ !ns_capable(old->user_ns, CAP_SETUID))
goto error;
}
abort_creds(new);
return retval;
}
-
+
/*
- * setuid() is implemented like SysV with SAVED_IDS
- *
+ * 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
+ * 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.
+ * regain them by swapping the real and effective uid.
*/
SYSCALL_DEFINE1(setuid, uid_t, uid)
{
old = current_cred();
retval = -EPERM;
- if (nsown_capable(CAP_SETUID)) {
+ if (ns_capable(old->user_ns, CAP_SETUID)) {
new->suid = new->uid = kuid;
if (!uid_eq(kuid, old->uid)) {
retval = set_user(new);
old = current_cred();
retval = -EPERM;
- if (!nsown_capable(CAP_SETUID)) {
+ if (!ns_capable(old->user_ns, CAP_SETUID)) {
if (ruid != (uid_t) -1 && !uid_eq(kruid, old->uid) &&
!uid_eq(kruid, old->euid) && !uid_eq(kruid, old->suid))
goto error;
euid = from_kuid_munged(cred->user_ns, cred->euid);
suid = from_kuid_munged(cred->user_ns, cred->suid);
- if (!(retval = put_user(ruid, ruidp)) &&
- !(retval = put_user(euid, euidp)))
- retval = put_user(suid, suidp);
-
+ retval = put_user(ruid, ruidp);
+ if (!retval) {
+ retval = put_user(euid, euidp);
+ if (!retval)
+ return put_user(suid, suidp);
+ }
return retval;
}
old = current_cred();
retval = -EPERM;
- if (!nsown_capable(CAP_SETGID)) {
+ if (!ns_capable(old->user_ns, CAP_SETGID)) {
if (rgid != (gid_t) -1 && !gid_eq(krgid, old->gid) &&
!gid_eq(krgid, old->egid) && !gid_eq(krgid, old->sgid))
goto error;
egid = from_kgid_munged(cred->user_ns, cred->egid);
sgid = from_kgid_munged(cred->user_ns, cred->sgid);
- if (!(retval = put_user(rgid, rgidp)) &&
- !(retval = put_user(egid, egidp)))
- retval = put_user(sgid, sgidp);
+ retval = put_user(rgid, rgidp);
+ if (!retval) {
+ retval = put_user(egid, egidp);
+ if (!retval)
+ retval = put_user(sgid, sgidp);
+ }
return retval;
}
if (uid_eq(kuid, old->uid) || uid_eq(kuid, old->euid) ||
uid_eq(kuid, old->suid) || uid_eq(kuid, old->fsuid) ||
- nsown_capable(CAP_SETUID)) {
+ ns_capable(old->user_ns, CAP_SETUID)) {
if (!uid_eq(kuid, old->fsuid)) {
new->fsuid = kuid;
if (security_task_fix_setuid(new, old, LSM_SETID_FS) == 0)
if (gid_eq(kgid, old->gid) || gid_eq(kgid, old->egid) ||
gid_eq(kgid, old->sgid) || gid_eq(kgid, old->fsgid) ||
- nsown_capable(CAP_SETGID)) {
+ ns_capable(old->user_ns, CAP_SETGID)) {
if (!gid_eq(kgid, old->fsgid)) {
new->fsgid = kgid;
goto change_okay;
commit_creds(new);
return old_fsgid;
}
+#endif /* CONFIG_MULTIUSER */
/**
* sys_getpid - return the thread group id of the current process
{
cputime_t tgutime, tgstime, cutime, cstime;
- spin_lock_irq(¤t->sighand->siglock);
thread_group_cputime_adjusted(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);
* 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
+ * !PF_FORKNOEXEC check to conform completely to POSIX.
*/
SYSCALL_DEFINE2(setpgid, pid_t, pid, pid_t, pgid)
{
if (task_session(p) != task_session(group_leader))
goto out;
err = -EACCES;
- if (p->did_exec)
+ if (!(p->flags & PF_FORKNOEXEC))
goto out;
} else {
err = -ESRCH;
return retval;
}
+static void set_special_pids(struct pid *pid)
+{
+ struct task_struct *curr = current->group_leader;
+
+ if (task_session(curr) != pid)
+ change_pid(curr, PIDTYPE_SID, pid);
+
+ if (task_pgrp(curr) != pid)
+ change_pid(curr, PIDTYPE_PGID, pid);
+}
+
SYSCALL_DEFINE0(setsid)
{
struct task_struct *group_leader = current->group_leader;
goto out;
group_leader->signal->leader = 1;
- __set_special_pids(sid);
+ set_special_pids(sid);
proc_clear_tty(group_leader);
/*
* 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
+ * And we map 4.x to 2.6.60+x, so 4.0 would be 2.6.60.
*/
static int override_release(char __user *release, size_t len)
{
break;
rest++;
}
- v = ((LINUX_VERSION_CODE >> 8) & 0xff) + 40;
+ v = ((LINUX_VERSION_CODE >> 8) & 0xff) + 60;
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);
/*
* Back compatibility for getrlimit. Needed for some apps.
*/
-
SYSCALL_DEFINE2(old_getrlimit, unsigned int, resource,
struct rlimit __user *, rlim)
{
x.rlim_cur = 0x7FFFFFFF;
if (x.rlim_max > 0x7FFFFFFF)
x.rlim_max = 0x7FFFFFFF;
- return copy_to_user(rlim, &x, sizeof(x))?-EFAULT:0;
+ return copy_to_user(rlim, &x, sizeof(x)) ? -EFAULT : 0;
}
#endif
cputime_t tgutime, tgstime, utime, stime;
unsigned long maxrss = 0;
- memset((char *) r, 0, sizeof *r);
+ memset((char *)r, 0, sizeof (*r));
utime = stime = 0;
if (who == RUSAGE_THREAD) {
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_cputime_adjusted(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);
+ 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;
- default:
- BUG();
+ case RUSAGE_SELF:
+ thread_group_cputime_adjusted(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);
+ } while_each_thread(p, t);
+ break;
+
+ default:
+ BUG();
}
unlock_task_sighand(p, &flags);
if (who != RUSAGE_CHILDREN) {
struct mm_struct *mm = get_task_mm(p);
+
if (mm) {
setmax_mm_hiwater_rss(&maxrss, mm);
mmput(mm);
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;
}
static int prctl_set_mm_exe_file(struct mm_struct *mm, unsigned int fd)
{
struct fd exe;
+ struct file *old_exe, *exe_file;
struct inode *inode;
int err;
* overall picture.
*/
err = -EACCES;
- if (!S_ISREG(inode->i_mode) ||
- exe.file->f_path.mnt->mnt_flags & MNT_NOEXEC)
+ if (!S_ISREG(inode->i_mode) || path_noexec(&exe.file->f_path))
goto exit;
err = inode_permission(inode, MAY_EXEC);
if (err)
goto exit;
- down_write(&mm->mmap_sem);
-
/*
* Forbid mm->exe_file change if old file still mapped.
*/
+ exe_file = get_mm_exe_file(mm);
err = -EBUSY;
- if (mm->exe_file) {
+ if (exe_file) {
struct vm_area_struct *vma;
- for (vma = mm->mmap; vma; vma = vma->vm_next)
- if (vma->vm_file &&
- path_equal(&vma->vm_file->f_path,
- &mm->exe_file->f_path))
- goto exit_unlock;
+ down_read(&mm->mmap_sem);
+ for (vma = mm->mmap; vma; vma = vma->vm_next) {
+ if (!vma->vm_file)
+ continue;
+ if (path_equal(&vma->vm_file->f_path,
+ &exe_file->f_path))
+ goto exit_err;
+ }
+
+ up_read(&mm->mmap_sem);
+ fput(exe_file);
}
/*
*/
err = -EPERM;
if (test_and_set_bit(MMF_EXE_FILE_CHANGED, &mm->flags))
- goto exit_unlock;
+ goto exit;
err = 0;
- set_mm_exe_file(mm, exe.file); /* this grabs a reference to exe.file */
-exit_unlock:
- up_write(&mm->mmap_sem);
-
+ /* set the new file, lockless */
+ get_file(exe.file);
+ old_exe = xchg(&mm->exe_file, exe.file);
+ if (old_exe)
+ fput(old_exe);
exit:
fdput(exe);
return err;
+exit_err:
+ up_read(&mm->mmap_sem);
+ fput(exe_file);
+ goto exit;
+}
+
+/*
+ * WARNING: we don't require any capability here so be very careful
+ * in what is allowed for modification from userspace.
+ */
+static int validate_prctl_map(struct prctl_mm_map *prctl_map)
+{
+ unsigned long mmap_max_addr = TASK_SIZE;
+ struct mm_struct *mm = current->mm;
+ int error = -EINVAL, i;
+
+ static const unsigned char offsets[] = {
+ offsetof(struct prctl_mm_map, start_code),
+ offsetof(struct prctl_mm_map, end_code),
+ offsetof(struct prctl_mm_map, start_data),
+ offsetof(struct prctl_mm_map, end_data),
+ offsetof(struct prctl_mm_map, start_brk),
+ offsetof(struct prctl_mm_map, brk),
+ offsetof(struct prctl_mm_map, start_stack),
+ offsetof(struct prctl_mm_map, arg_start),
+ offsetof(struct prctl_mm_map, arg_end),
+ offsetof(struct prctl_mm_map, env_start),
+ offsetof(struct prctl_mm_map, env_end),
+ };
+
+ /*
+ * Make sure the members are not somewhere outside
+ * of allowed address space.
+ */
+ for (i = 0; i < ARRAY_SIZE(offsets); i++) {
+ u64 val = *(u64 *)((char *)prctl_map + offsets[i]);
+
+ if ((unsigned long)val >= mmap_max_addr ||
+ (unsigned long)val < mmap_min_addr)
+ goto out;
+ }
+
+ /*
+ * Make sure the pairs are ordered.
+ */
+#define __prctl_check_order(__m1, __op, __m2) \
+ ((unsigned long)prctl_map->__m1 __op \
+ (unsigned long)prctl_map->__m2) ? 0 : -EINVAL
+ error = __prctl_check_order(start_code, <, end_code);
+ error |= __prctl_check_order(start_data, <, end_data);
+ error |= __prctl_check_order(start_brk, <=, brk);
+ error |= __prctl_check_order(arg_start, <=, arg_end);
+ error |= __prctl_check_order(env_start, <=, env_end);
+ if (error)
+ goto out;
+#undef __prctl_check_order
+
+ error = -EINVAL;
+
+ /*
+ * @brk should be after @end_data in traditional maps.
+ */
+ if (prctl_map->start_brk <= prctl_map->end_data ||
+ prctl_map->brk <= prctl_map->end_data)
+ goto out;
+
+ /*
+ * Neither we should allow to override limits if they set.
+ */
+ if (check_data_rlimit(rlimit(RLIMIT_DATA), prctl_map->brk,
+ prctl_map->start_brk, prctl_map->end_data,
+ prctl_map->start_data))
+ goto out;
+
+ /*
+ * Someone is trying to cheat the auxv vector.
+ */
+ if (prctl_map->auxv_size) {
+ if (!prctl_map->auxv || prctl_map->auxv_size > sizeof(mm->saved_auxv))
+ goto out;
+ }
+
+ /*
+ * Finally, make sure the caller has the rights to
+ * change /proc/pid/exe link: only local root should
+ * be allowed to.
+ */
+ if (prctl_map->exe_fd != (u32)-1) {
+ struct user_namespace *ns = current_user_ns();
+ const struct cred *cred = current_cred();
+
+ if (!uid_eq(cred->uid, make_kuid(ns, 0)) ||
+ !gid_eq(cred->gid, make_kgid(ns, 0)))
+ goto out;
+ }
+
+ error = 0;
+out:
+ return error;
+}
+
+#ifdef CONFIG_CHECKPOINT_RESTORE
+static int prctl_set_mm_map(int opt, const void __user *addr, unsigned long data_size)
+{
+ struct prctl_mm_map prctl_map = { .exe_fd = (u32)-1, };
+ unsigned long user_auxv[AT_VECTOR_SIZE];
+ struct mm_struct *mm = current->mm;
+ int error;
+
+ BUILD_BUG_ON(sizeof(user_auxv) != sizeof(mm->saved_auxv));
+ BUILD_BUG_ON(sizeof(struct prctl_mm_map) > 256);
+
+ if (opt == PR_SET_MM_MAP_SIZE)
+ return put_user((unsigned int)sizeof(prctl_map),
+ (unsigned int __user *)addr);
+
+ if (data_size != sizeof(prctl_map))
+ return -EINVAL;
+
+ if (copy_from_user(&prctl_map, addr, sizeof(prctl_map)))
+ return -EFAULT;
+
+ error = validate_prctl_map(&prctl_map);
+ if (error)
+ return error;
+
+ if (prctl_map.auxv_size) {
+ memset(user_auxv, 0, sizeof(user_auxv));
+ if (copy_from_user(user_auxv,
+ (const void __user *)prctl_map.auxv,
+ prctl_map.auxv_size))
+ return -EFAULT;
+
+ /* Last entry must be AT_NULL as specification requires */
+ user_auxv[AT_VECTOR_SIZE - 2] = AT_NULL;
+ user_auxv[AT_VECTOR_SIZE - 1] = AT_NULL;
+ }
+
+ if (prctl_map.exe_fd != (u32)-1) {
+ error = prctl_set_mm_exe_file(mm, prctl_map.exe_fd);
+ if (error)
+ return error;
+ }
+
+ down_write(&mm->mmap_sem);
+
+ /*
+ * We don't validate if these members are pointing to
+ * real present VMAs because application may have correspond
+ * VMAs already unmapped and kernel uses these members for statistics
+ * output in procfs mostly, except
+ *
+ * - @start_brk/@brk which are used in do_brk but kernel lookups
+ * for VMAs when updating these memvers so anything wrong written
+ * here cause kernel to swear at userspace program but won't lead
+ * to any problem in kernel itself
+ */
+
+ mm->start_code = prctl_map.start_code;
+ mm->end_code = prctl_map.end_code;
+ mm->start_data = prctl_map.start_data;
+ mm->end_data = prctl_map.end_data;
+ mm->start_brk = prctl_map.start_brk;
+ mm->brk = prctl_map.brk;
+ mm->start_stack = prctl_map.start_stack;
+ mm->arg_start = prctl_map.arg_start;
+ mm->arg_end = prctl_map.arg_end;
+ mm->env_start = prctl_map.env_start;
+ mm->env_end = prctl_map.env_end;
+
+ /*
+ * Note this update of @saved_auxv is lockless thus
+ * if someone reads this member in procfs while we're
+ * updating -- it may get partly updated results. It's
+ * known and acceptable trade off: we leave it as is to
+ * not introduce additional locks here making the kernel
+ * more complex.
+ */
+ if (prctl_map.auxv_size)
+ memcpy(mm->saved_auxv, user_auxv, sizeof(user_auxv));
+
+ up_write(&mm->mmap_sem);
+ return 0;
+}
+#endif /* CONFIG_CHECKPOINT_RESTORE */
+
+static int prctl_set_auxv(struct mm_struct *mm, unsigned long addr,
+ unsigned long len)
+{
+ /*
+ * This doesn't move the auxiliary vector itself since it's pinned to
+ * mm_struct, but it permits filling the vector with new values. It's
+ * up to the caller to provide sane values here, otherwise userspace
+ * tools which use this vector might be unhappy.
+ */
+ unsigned long user_auxv[AT_VECTOR_SIZE];
+
+ if (len > sizeof(user_auxv))
+ return -EINVAL;
+
+ if (copy_from_user(user_auxv, (const void __user *)addr, len))
+ return -EFAULT;
+
+ /* Make sure the last entry is always AT_NULL */
+ user_auxv[AT_VECTOR_SIZE - 2] = 0;
+ user_auxv[AT_VECTOR_SIZE - 1] = 0;
+
+ BUILD_BUG_ON(sizeof(user_auxv) != sizeof(mm->saved_auxv));
+
+ task_lock(current);
+ memcpy(mm->saved_auxv, user_auxv, len);
+ task_unlock(current);
+
+ return 0;
}
static int prctl_set_mm(int opt, unsigned long addr,
unsigned long arg4, unsigned long arg5)
{
- unsigned long rlim = rlimit(RLIMIT_DATA);
struct mm_struct *mm = current->mm;
+ struct prctl_mm_map prctl_map;
struct vm_area_struct *vma;
int error;
- if (arg5 || (arg4 && opt != PR_SET_MM_AUXV))
+ if (arg5 || (arg4 && (opt != PR_SET_MM_AUXV &&
+ opt != PR_SET_MM_MAP &&
+ opt != PR_SET_MM_MAP_SIZE)))
return -EINVAL;
+#ifdef CONFIG_CHECKPOINT_RESTORE
+ if (opt == PR_SET_MM_MAP || opt == PR_SET_MM_MAP_SIZE)
+ return prctl_set_mm_map(opt, (const void __user *)addr, arg4);
+#endif
+
if (!capable(CAP_SYS_RESOURCE))
return -EPERM;
if (opt == PR_SET_MM_EXE_FILE)
return prctl_set_mm_exe_file(mm, (unsigned int)addr);
+ if (opt == PR_SET_MM_AUXV)
+ return prctl_set_auxv(mm, addr, arg4);
+
if (addr >= TASK_SIZE || addr < mmap_min_addr)
return -EINVAL;
error = -EINVAL;
- down_read(&mm->mmap_sem);
+ down_write(&mm->mmap_sem);
vma = find_vma(mm, addr);
+ prctl_map.start_code = mm->start_code;
+ prctl_map.end_code = mm->end_code;
+ prctl_map.start_data = mm->start_data;
+ prctl_map.end_data = mm->end_data;
+ prctl_map.start_brk = mm->start_brk;
+ prctl_map.brk = mm->brk;
+ prctl_map.start_stack = mm->start_stack;
+ prctl_map.arg_start = mm->arg_start;
+ prctl_map.arg_end = mm->arg_end;
+ prctl_map.env_start = mm->env_start;
+ prctl_map.env_end = mm->env_end;
+ prctl_map.auxv = NULL;
+ prctl_map.auxv_size = 0;
+ prctl_map.exe_fd = -1;
+
switch (opt) {
case PR_SET_MM_START_CODE:
- mm->start_code = addr;
+ prctl_map.start_code = addr;
break;
case PR_SET_MM_END_CODE:
- mm->end_code = addr;
+ prctl_map.end_code = addr;
break;
case PR_SET_MM_START_DATA:
- mm->start_data = addr;
+ prctl_map.start_data = addr;
break;
case PR_SET_MM_END_DATA:
- mm->end_data = addr;
+ prctl_map.end_data = addr;
+ break;
+ case PR_SET_MM_START_STACK:
+ prctl_map.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;
+ prctl_map.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;
+ prctl_map.brk = addr;
+ break;
+ case PR_SET_MM_ARG_START:
+ prctl_map.arg_start = addr;
+ break;
+ case PR_SET_MM_ARG_END:
+ prctl_map.arg_end = addr;
+ break;
+ case PR_SET_MM_ENV_START:
+ prctl_map.env_start = addr;
break;
+ case PR_SET_MM_ENV_END:
+ prctl_map.env_end = addr;
+ break;
+ default:
+ goto out;
+ }
+
+ error = validate_prctl_map(&prctl_map);
+ if (error)
+ goto out;
+ switch (opt) {
/*
* If command line arguments and environment
* are placed somewhere else on stack, we can
error = -EFAULT;
goto out;
}
- if (opt == PR_SET_MM_START_STACK)
- mm->start_stack = addr;
- else if (opt == PR_SET_MM_ARG_START)
- mm->arg_start = addr;
- else if (opt == PR_SET_MM_ARG_END)
- mm->arg_end = addr;
- else if (opt == PR_SET_MM_ENV_START)
- mm->env_start = addr;
- else if (opt == PR_SET_MM_ENV_END)
- mm->env_end = addr;
- break;
+ }
- /*
- * This doesn't move auxiliary vector itself
- * since it's pinned to mm_struct, but allow
- * to fill vector with new values. It's up
- * to a caller to provide sane values here
- * otherwise user space tools which use this
- * vector might be unhappy.
- */
- case PR_SET_MM_AUXV: {
- unsigned long user_auxv[AT_VECTOR_SIZE];
+ mm->start_code = prctl_map.start_code;
+ mm->end_code = prctl_map.end_code;
+ mm->start_data = prctl_map.start_data;
+ mm->end_data = prctl_map.end_data;
+ mm->start_brk = prctl_map.start_brk;
+ mm->brk = prctl_map.brk;
+ mm->start_stack = prctl_map.start_stack;
+ mm->arg_start = prctl_map.arg_start;
+ mm->arg_end = prctl_map.arg_end;
+ mm->env_start = prctl_map.env_start;
+ mm->env_end = prctl_map.env_end;
- if (arg4 > sizeof(user_auxv))
- goto out;
- up_read(&mm->mmap_sem);
+ error = 0;
+out:
+ up_write(&mm->mmap_sem);
+ return error;
+}
- if (copy_from_user(user_auxv, (const void __user *)addr, arg4))
- return -EFAULT;
+#ifdef CONFIG_CHECKPOINT_RESTORE
+static int prctl_get_tid_address(struct task_struct *me, int __user **tid_addr)
+{
+ return put_user(me->clear_child_tid, tid_addr);
+}
+#else
+static int prctl_get_tid_address(struct task_struct *me, int __user **tid_addr)
+{
+ return -EINVAL;
+}
+#endif
+
+#ifdef CONFIG_MMU
+static int prctl_update_vma_anon_name(struct vm_area_struct *vma,
+ struct vm_area_struct **prev,
+ unsigned long start, unsigned long end,
+ const char __user *name_addr)
+{
+ struct mm_struct *mm = vma->vm_mm;
+ int error = 0;
+ pgoff_t pgoff;
- /* Make sure the last entry is always AT_NULL */
- user_auxv[AT_VECTOR_SIZE - 2] = 0;
- user_auxv[AT_VECTOR_SIZE - 1] = 0;
+ if (name_addr == vma_get_anon_name(vma)) {
+ *prev = vma;
+ goto out;
+ }
- BUILD_BUG_ON(sizeof(user_auxv) != sizeof(mm->saved_auxv));
+ pgoff = vma->vm_pgoff + ((start - vma->vm_start) >> PAGE_SHIFT);
+ *prev = vma_merge(mm, *prev, start, end, vma->vm_flags, vma->anon_vma,
+ vma->vm_file, pgoff, vma_policy(vma),
+ vma->vm_userfaultfd_ctx, name_addr);
+ if (*prev) {
+ vma = *prev;
+ goto success;
+ }
- task_lock(current);
- memcpy(mm->saved_auxv, user_auxv, arg4);
- task_unlock(current);
+ *prev = vma;
- return 0;
+ if (start != vma->vm_start) {
+ error = split_vma(mm, vma, start, 1);
+ if (error)
+ goto out;
}
- default:
- goto out;
+
+ if (end != vma->vm_end) {
+ error = split_vma(mm, vma, end, 0);
+ if (error)
+ goto out;
}
- error = 0;
+success:
+ if (!vma->vm_file)
+ vma->anon_name = name_addr;
+
out:
- up_read(&mm->mmap_sem);
+ if (error == -ENOMEM)
+ error = -EAGAIN;
return error;
}
-#ifdef CONFIG_CHECKPOINT_RESTORE
-static int prctl_get_tid_address(struct task_struct *me, int __user **tid_addr)
+static int prctl_set_vma_anon_name(unsigned long start, unsigned long end,
+ unsigned long arg)
{
- return put_user(me->clear_child_tid, tid_addr);
+ unsigned long tmp;
+ struct vm_area_struct *vma, *prev;
+ int unmapped_error = 0;
+ int error = -EINVAL;
+
+ /*
+ * If the interval [start,end) covers some unmapped address
+ * ranges, just ignore them, but return -ENOMEM at the end.
+ * - this matches the handling in madvise.
+ */
+ vma = find_vma_prev(current->mm, start, &prev);
+ if (vma && start > vma->vm_start)
+ prev = vma;
+
+ for (;;) {
+ /* Still start < end. */
+ error = -ENOMEM;
+ if (!vma)
+ return error;
+
+ /* Here start < (end|vma->vm_end). */
+ if (start < vma->vm_start) {
+ unmapped_error = -ENOMEM;
+ start = vma->vm_start;
+ if (start >= end)
+ return error;
+ }
+
+ /* Here vma->vm_start <= start < (end|vma->vm_end) */
+ tmp = vma->vm_end;
+ if (end < tmp)
+ tmp = end;
+
+ /* Here vma->vm_start <= start < tmp <= (end|vma->vm_end). */
+ error = prctl_update_vma_anon_name(vma, &prev, start, tmp,
+ (const char __user *)arg);
+ if (error)
+ return error;
+ start = tmp;
+ if (prev && start < prev->vm_end)
+ start = prev->vm_end;
+ error = unmapped_error;
+ if (start >= end)
+ return error;
+ if (prev)
+ vma = prev->vm_next;
+ else /* madvise_remove dropped mmap_sem */
+ vma = find_vma(current->mm, start);
+ }
}
-#else
-static int prctl_get_tid_address(struct task_struct *me, int __user **tid_addr)
+
+static int prctl_set_vma(unsigned long opt, unsigned long start,
+ unsigned long len_in, unsigned long arg)
+{
+ struct mm_struct *mm = current->mm;
+ int error;
+ unsigned long len;
+ unsigned long end;
+
+ if (start & ~PAGE_MASK)
+ return -EINVAL;
+ len = (len_in + ~PAGE_MASK) & PAGE_MASK;
+
+ /* Check to see whether len was rounded up from small -ve to zero */
+ if (len_in && !len)
+ return -EINVAL;
+
+ end = start + len;
+ if (end < start)
+ return -EINVAL;
+
+ if (end == start)
+ return 0;
+
+ down_write(&mm->mmap_sem);
+
+ switch (opt) {
+ case PR_SET_VMA_ANON_NAME:
+ error = prctl_set_vma_anon_name(start, end, arg);
+ break;
+ default:
+ error = -EINVAL;
+ }
+
+ up_write(&mm->mmap_sem);
+
+ return error;
+}
+#else /* CONFIG_MMU */
+static int prctl_set_vma(unsigned long opt, unsigned long start,
+ unsigned long len_in, unsigned long arg)
{
return -EINVAL;
}
unsigned long, arg4, unsigned long, arg5)
{
struct task_struct *me = current;
+ struct task_struct *tsk;
unsigned char comm[sizeof(me->comm)];
long error;
case PR_GET_TID_ADDRESS:
error = prctl_get_tid_address(me, (int __user **)arg2);
break;
+ case PR_SET_TIMERSLACK_PID:
+ if (task_pid_vnr(current) != (pid_t)arg3 &&
+ !capable(CAP_SYS_NICE))
+ return -EPERM;
+ rcu_read_lock();
+ tsk = find_task_by_vpid((pid_t)arg3);
+ if (tsk == NULL) {
+ rcu_read_unlock();
+ return -EINVAL;
+ }
+ get_task_struct(tsk);
+ rcu_read_unlock();
+ if (arg2 <= 0)
+ tsk->timer_slack_ns =
+ tsk->default_timer_slack_ns;
+ else
+ tsk->timer_slack_ns = arg2;
+ put_task_struct(tsk);
+ error = 0;
+ break;
case PR_SET_CHILD_SUBREAPER:
me->signal->is_child_subreaper = !!arg2;
break;
if (arg2 != 1 || arg3 || arg4 || arg5)
return -EINVAL;
- current->no_new_privs = 1;
+ task_set_no_new_privs(current);
break;
case PR_GET_NO_NEW_PRIVS:
if (arg2 || arg3 || arg4 || arg5)
return -EINVAL;
- return current->no_new_privs ? 1 : 0;
+ return task_no_new_privs(current) ? 1 : 0;
+ case PR_GET_THP_DISABLE:
+ if (arg2 || arg3 || arg4 || arg5)
+ return -EINVAL;
+ error = !!(me->mm->def_flags & VM_NOHUGEPAGE);
+ break;
+ case PR_SET_THP_DISABLE:
+ if (arg3 || arg4 || arg5)
+ return -EINVAL;
+ down_write(&me->mm->mmap_sem);
+ if (arg2)
+ me->mm->def_flags |= VM_NOHUGEPAGE;
+ else
+ me->mm->def_flags &= ~VM_NOHUGEPAGE;
+ up_write(&me->mm->mmap_sem);
+ break;
+ case PR_MPX_ENABLE_MANAGEMENT:
+ if (arg2 || arg3 || arg4 || arg5)
+ return -EINVAL;
+ error = MPX_ENABLE_MANAGEMENT();
+ break;
+ case PR_MPX_DISABLE_MANAGEMENT:
+ if (arg2 || arg3 || arg4 || arg5)
+ return -EINVAL;
+ error = MPX_DISABLE_MANAGEMENT();
+ break;
+ case PR_SET_FP_MODE:
+ error = SET_FP_MODE(me, arg2);
+ break;
+ case PR_GET_FP_MODE:
+ error = GET_FP_MODE(me);
+ break;
+ case PR_SET_VMA:
+ error = prctl_set_vma(arg2, arg3, arg4, arg5);
+ break;
default:
error = -EINVAL;
break;
{
int err = 0;
int cpu = raw_smp_processor_id();
+
if (cpup)
err |= put_user(cpu, cpup);
if (nodep)
return err ? -EFAULT : 0;
}
-char poweroff_cmd[POWEROFF_CMD_PATH_LEN] = "/sbin/poweroff";
-
-static int __orderly_poweroff(bool force)
-{
- char **argv;
- static char *envp[] = {
- "HOME=/",
- "PATH=/sbin:/bin:/usr/sbin:/usr/bin",
- NULL
- };
- int ret;
-
- argv = argv_split(GFP_KERNEL, poweroff_cmd, NULL);
- if (argv) {
- ret = call_usermodehelper(argv[0], argv, envp, UMH_WAIT_EXEC);
- argv_free(argv);
- } else {
- printk(KERN_WARNING "%s failed to allocate memory for \"%s\"\n",
- __func__, poweroff_cmd);
- ret = -ENOMEM;
- }
-
- 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;
-}
-
-static bool poweroff_force;
-
-static void poweroff_work_func(struct work_struct *work)
-{
- __orderly_poweroff(poweroff_force);
-}
-
-static DECLARE_WORK(poweroff_work, poweroff_work_func);
-
-/**
- * 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)
-{
- if (force) /* do not override the pending "true" */
- poweroff_force = true;
- schedule_work(&poweroff_work);
- return 0;
-}
-EXPORT_SYMBOL_GPL(orderly_poweroff);
-
/**
* do_sysinfo - fill in sysinfo struct
* @info: pointer to buffer to fill
memset(info, 0, sizeof(struct sysinfo));
- ktime_get_ts(&tp);
- monotonic_to_bootbased(&tp);
+ get_monotonic_boottime(&tp);
info->uptime = tp.tv_sec + (tp.tv_nsec ? 1 : 0);
get_avenrun(info->loads, 0, SI_LOAD_SHIFT - FSHIFT);
/* Check to see if any memory value is too large for 32-bit and scale
* down if needed
*/
- if ((s.totalram >> 32) || (s.totalswap >> 32)) {
+ if (upper_32_bits(s.totalram) || upper_32_bits(s.totalswap)) {
int bitcount = 0;
while (s.mem_unit < PAGE_SIZE) {
projects / firefly-linux-kernel-4.4.55.git / blobdiff