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// task information tapset
// Copyright (C) 2006 Intel Corporation.
// Copyright (C) 2010-2017 Red Hat Inc.
//
// This file is part of systemtap, and is free software. You can
// redistribute it and/or modify it under the terms of the GNU General
// Public License (GPL); either version 2, or (at your option) any
// later version.
%{
#include <linux/version.h>
#include <linux/file.h>
#if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,25)
#include <linux/fdtable.h>
#endif
#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,9,0)
#include <linux/sched/rt.h>
#endif
#ifndef STAPCONF_TASK_UID
#include <linux/cred.h>
#endif
#include <linux/fs_struct.h>
#include <linux/mm.h>
%}
/**
* sfunction task_current - The current task_struct of the current task
*
* Description: This function returns the task_struct representing the current process.
* This address can be passed to the various task_*() functions to extract
* more task-specific data.
*/
function task_current:long () {
return & @task(%{ /* pure */ (unsigned long)current %})
}
@__private30 function _task_rlimit_cur:long (task:long, nd_limit:long)
{
if (nd_limit < 0 || nd_limit >= @const("RLIM_NLIMITS")) {
return -1;
}
sig = @task(task)->signal;
return @cast(sig, "signal_struct", "kernel")->rlim[nd_limit]->rlim_cur;
}
/* sfunction task_rlimit - The current resource limit of the task
*
* @task: task_struct pointer
* @lim_str: String representing limit.
*
* Description: Little bit slower way how ger resource limits of
* process.
* There is need translate string into number for each call.
*/
function task_rlimit:long (task:long, lim_str:string)
{
lim = rlimit_from_str(lim_str);
if (lim == -1) { return -1; }
return _task_rlimit_cur(task, lim);
}
/* Fast and "safe" way how to do it. */
function task_rlimit_cpu:long (task:long)
{
return _task_rlimit_cur(task, @const("RLIMIT_CPU") );
}
function task_rlimit_fsize:long (task:long)
{
return _task_rlimit_cur(task, @const("RLIMIT_FSIZE"));
}
function task_rlimit_data:long (task:long)
{
return _task_rlimit_cur(task, @const("RLIMIT_DATA"));
}
function task_rlimit_stack:long (task:long)
{
return _task_rlimit_cur(task, @const("RLIMIT_STACK"));
}
function task_rlimit_core:long (task:long)
{
return _task_rlimit_cur(task, @const("RLIMIT_CORE"));
}
function task_rlimit_rss:long (task:long)
{
return _task_rlimit_cur(task, @const("RLIMIT_RSS"));
}
function task_rlimit_nproc:long (task:long)
{
return _task_rlimit_cur(task, @const("RLIMIT_NPROC"));
}
function task_rlimit_nofile:long(task:long)
{
return _task_rlimit_cur(task, @const("RLIMIT_NOFILE"));
}
function task_rlimit_memlock:long(task:long)
{
return _task_rlimit_cur(task, @const("RLIMIT_MEMLOCK"));
}
function task_rlimit_as:long(task:long)
{
return _task_rlimit_cur(task, @const("RLIMIT_AS"));
}
function task_rlimit_locks:long(task:long)
{
return _task_rlimit_cur(task, @const("RLIMIT_LOCKS"));
}
function task_rlimit_sigpending:long(task:long)
{
%( kernel_v >= "2.6.8" %?
return _task_rlimit_cur(task, @const("RLIMIT_SIGPENDING"));
%:
return -1
%)
}
function task_rlimit_msgqueue:long(task:long)
{
%( kernel_v >= "2.6.8" %?
return _task_rlimit_cur(task, @const("RLIMIT_MSGQUEUE"));
%:
return -1
%)
}
function task_rlimit_nice:long(task:long)
{
%( kernel_v >= "2.6.12" %?
return _task_rlimit_cur(task, @const("RLIMIT_NICE"));
%:
return -1
%)
}
function task_rlimit_rtprio:long(task:long)
{
%( kernel_v >= "2.6.12" %?
return _task_rlimit_cur(task, @const("RLIMIT_RTPRIO"));
%:
return -1
%)
}
function task_rlimit_rttime:long(task:long)
{
%( kernel_v >= "2.6.25" %?
return _task_rlimit_cur(task, @const("RLIMIT_RTTIME"));
%:
return -1
%)
}
/**
* sfunction task_parent - The task_struct of the parent task
*
* @task: task_struct pointer
*
* Description: This function returns the parent task_struct of
* the given task. This address can be passed to the various
* task_*() functions to extract more task-specific data.
*/
function task_parent:long(task:long)
{
return @choose_defined(@task(task)->real_parent, @task(task)->parent)
}
/**
* sfunction task_state - The state of the task
*
* @task: task_struct pointer
*
* Description: Return the state of the given task, one of:
* TASK_RUNNING (0), TASK_INTERRUPTIBLE (1), TASK_UNINTERRUPTIBLE (2),
* TASK_STOPPED (4), TASK_TRACED (8), EXIT_ZOMBIE (16), or EXIT_DEAD (32).
*/
function task_state:long (task:long)
{
return @task(task)->state
}
/**
* sfunction task_execname - The name of the task
*
* @task: task_struct pointer
*
* Description: Return the name of the given task.
*/
function task_execname:string (task:long)
{
return kernel_string(@task(task)->comm)
}
/**
* sfunction task_pid - The process identifier of the task
*
* @task: task_struct pointer
*
* Description: This fucntion returns the process id of the given task.
*/
function task_pid:long (task:long)
{
return @task(task)->tgid
}
/**
* sfunction task_ns_pid - The process identifier of the task
*
* @task: task_struct pointer
*
* Description: This fucntion returns the process id of the given task based on
* the specified pid namespace..
*/
function task_ns_pid:long (task:long) %{ /* pure */ /* guru */
struct task_struct *t = (struct task_struct *)(uintptr_t)STAP_ARG_task;
int64_t rc;
/* Before using the task_struct pointer, make sure it is valid to
* read. */
(void)kderef_buffer(NULL, t, sizeof(struct task_struct));
rc = from_target_pid_ns(t, PID);
if (rc < 0)
STAP_ERROR ("cannot resolve id in namespace");
else
STAP_RETURN (rc);
CATCH_DEREF_FAULT();
%}
/**
* sfunction pid2task - The task_struct of the given process identifier
*
* @pid: process identifier
*
* Description: Return the task struct of the given process id.
*/
function pid2task:long (pid:long) {
return & @task(%{ /* pure */ ({
struct task_struct *t = NULL;
pid_t t_pid = (pid_t)(long)STAP_ARG_pid;
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,31)
struct pid *p_pid = find_get_pid(t_pid);
rcu_read_lock();
t = pid_task(p_pid, PIDTYPE_PID);
put_pid(p_pid);
#else
rcu_read_lock();
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,24)
t = find_task_by_vpid (t_pid);
#else
t = find_task_by_pid (t_pid);
#endif /* 2.6.24 */
#endif /* 2.6.31 */
rcu_read_unlock();
(unsigned long)t;
}) %})
}
/**
* sfunction pid2execname - The name of the given process identifier
*
* @pid: process identifier
*
* Description: Return the name of the given process id.
*/
function pid2execname:string (pid:long) {
tsk = pid2task(pid)
if (tsk)
return task_execname(tsk)
return ""
}
/**
* sfunction task_tid - The thread identifier of the task
*
* @task: task_struct pointer
*
* Description: This function returns the thread id of the given task.
*/
function task_tid:long (task:long)
{
return @task(task)->pid
}
/**
* sfunction task_ns_tid - The thread identifier of the task as seen in a namespace
*
* @task: task_struct pointer
*
* Description: This function returns the thread id of the given task as seen
* in the pid namespace.
*/
function task_ns_tid:long (task:long)%{ /* pure */ /* guru */
struct task_struct *t = (struct task_struct *)(uintptr_t)STAP_ARG_task;
int64_t rc;
/* Before using the task_struct pointer, make sure it is valid to
* read. */
(void)kderef_buffer(NULL, t, sizeof(struct task_struct));
rc = from_target_pid_ns(t, TID);
if (rc < 0)
STAP_ERROR ("cannot resolve id in namespace");
else
STAP_RETURN (rc);
CATCH_DEREF_FAULT();
%}
/**
* sfunction task_gid - The group identifier of the task
*
* @task: task_struct pointer
*
* Description: This function returns the group id of the given task.
*/
function task_gid:long (task:long) %{ /* pure */
struct task_struct *t = (struct task_struct *)(uintptr_t)STAP_ARG_task;
#ifdef STAPCONF_TASK_UID
STAP_RETVALUE = kread(&(t->gid));
#else
#ifdef STAPCONF_FROM_KUID_MUNGED
struct user_namespace *user_ns;
#endif
/* We can't easily kread the task_struct's rcu-protected
* credential fields. So, let's just make sure the entire
* task_struct is valid to read. */
(void)kderef_buffer(NULL, t, sizeof(struct task_struct));
/* If task_gid() isn't defined, make our own. */
#if !defined(task_gid) && defined(task_cred_xxx)
#define task_gid(task) (task_cred_xxx((task), gid))
#endif
#ifdef STAPCONF_FROM_KUID_MUNGED
/* We also need to validate the namespace structure. */
user_ns = task_cred_xxx(t, user_ns);
(void)kderef_buffer(NULL, user_ns, sizeof(struct user_namespace));
STAP_RETVALUE = from_kgid_munged(user_ns, task_gid(t));
#else
STAP_RETVALUE = task_gid (t);
#endif
#endif
CATCH_DEREF_FAULT();
%}
/**
* sfunction task_ns_gid - The group identifier of the task as seen in a namespace
*
* @task: task_struct pointer
*
* Description: This function returns the group id of the given task as seen in
* in the given user namespace.
*/
function task_ns_gid:long (task:long) %{ /* pure */ /* guru */
struct task_struct *t = (struct task_struct *)(uintptr_t)STAP_ARG_task;
int64_t rc;
/* Before using the task_struct pointer, make sure it is valid to
* read. */
(void)kderef_buffer(NULL, t, sizeof(struct task_struct));
rc = from_target_user_ns(t, GID);
if (rc < 0)
STAP_ERROR ("cannot resolve id in namespace");
else
STAP_RETURN (rc);
CATCH_DEREF_FAULT();
%}
/**
* sfunction task_egid - The effective group identifier of the task
*
* @task: task_struct pointer
*
* Description: This function returns the effective group id of the given task.
*/
function task_egid:long (task:long) %{ /* pure */
struct task_struct *t = (struct task_struct *)(uintptr_t)STAP_ARG_task;
#ifdef STAPCONF_TASK_UID
STAP_RETVALUE = kread(&(t->egid));
#else
#ifdef STAPCONF_FROM_KUID_MUNGED
struct user_namespace *user_ns;
#endif
/* We can't easily kread the task_struct's rcu-protected
* credential fields. So, let's just make sure the entire
* task_struct is valid to read. */
(void)kderef_buffer(NULL, t, sizeof(struct task_struct));
/* If task_egid() isn't defined, make our own. */
#if !defined(task_egid) && defined(task_cred_xxx)
#define task_egid(task) (task_cred_xxx((task), egid))
#endif
#ifdef STAPCONF_FROM_KUID_MUNGED
/* We also need to validate the namespace structure. */
user_ns = task_cred_xxx(t, user_ns);
(void)kderef_buffer(NULL, user_ns, sizeof(struct user_namespace));
STAP_RETVALUE = from_kgid_munged(user_ns, task_egid(t));
#else
STAP_RETVALUE = task_egid (t);
#endif
#endif
CATCH_DEREF_FAULT();
%}
/**
* sfunction task_ns_egid - The effective group identifier of the task
*
* @task: task_struct pointer
*
* Description: This function returns the effective group id of the given task.
*/
function task_ns_egid:long (task:long) %{ /* pure */ /* guru */
struct task_struct *t = (struct task_struct *)(uintptr_t)STAP_ARG_task;
int64_t rc;
/* Before using the task_struct pointer, make sure it is valid to
* read. */
(void)kderef_buffer(NULL, t, sizeof(struct task_struct));
rc = from_target_user_ns(current, EGID);
if (rc < 0)
STAP_ERROR ("cannot resolve id in namespace");
else
STAP_RETURN (rc);
CATCH_DEREF_FAULT();
%}
/**
* sfunction task_uid - The user identifier of the task
*
* @task: task_struct pointer
*
* Description: This function returns the user id of the given task.
*/
function task_uid:long (task:long) %{ /* pure */
struct task_struct *t = (struct task_struct *)(uintptr_t)STAP_ARG_task;
#ifdef STAPCONF_TASK_UID
STAP_RETVALUE = kread(&(t->uid));
#else
#ifdef STAPCONF_FROM_KUID_MUNGED
struct user_namespace *user_ns;
#endif
/* We can't easily kread the task_struct's rcu-protected
* credential fields. So, let's just make sure the entire
* task_struct is valid to read. */
(void)kderef_buffer(NULL, t, sizeof(struct task_struct));
#ifdef STAPCONF_FROM_KUID_MUNGED
/* We also need to validate the namespace structure. */
user_ns = task_cred_xxx(t, user_ns);
(void)kderef_buffer(NULL, user_ns, sizeof(struct user_namespace));
STAP_RETVALUE = from_kuid_munged(user_ns, task_uid(t));
#else
STAP_RETVALUE = task_uid (t);
#endif
#endif
CATCH_DEREF_FAULT();
%}
/**
* sfunction task_ns_uid - The user identifier of the task
*
* @task: task_struct pointer
*
* Description: This function returns the user id of the given task.
*/
function task_ns_uid:long (task:long) %{ /* pure */ /* guru */
struct task_struct *t = (struct task_struct *)(uintptr_t)STAP_ARG_task;
int64_t rc;
/* Before using the task_struct pointer, make sure it is valid to
* read. */
(void)kderef_buffer(NULL, t, sizeof(struct task_struct));
rc = from_target_user_ns(current, UID);
if (rc < 0)
STAP_ERROR ("cannot resolve id in namespace");
else
STAP_RETURN (rc);
CATCH_DEREF_FAULT();
%}
/**
* sfunction task_euid - The effective user identifier of the task
*
* @task: task_struct pointer
*
* Description: This function returns the effective user id of the given task.
*/
function task_euid:long (task:long) %{ /* pure */
struct task_struct *t = (struct task_struct *)(uintptr_t)STAP_ARG_task;
#ifdef STAPCONF_TASK_UID
STAP_RETVALUE = kread(&(t->euid));
#else
#ifdef STAPCONF_FROM_KUID_MUNGED
struct user_namespace *user_ns;
#endif
/* We can't easily kread the task_struct's rcu-protected
* credential fields. So, let's just make sure the entire
* task_struct is valid to read. */
(void)kderef_buffer(NULL, t, sizeof(struct task_struct));
#ifdef STAPCONF_FROM_KUID_MUNGED
/* We also need to validate the namespace structure. */
user_ns = task_cred_xxx(t, user_ns);
(void)kderef_buffer(NULL, user_ns, sizeof(struct user_namespace));
STAP_RETVALUE = from_kuid_munged(user_ns, task_euid(t));
#else
STAP_RETVALUE = task_euid (t);
#endif
#endif
CATCH_DEREF_FAULT();
%}
/**
* sfunction task_ns_euid - The effective user identifier of the task
*
* @task: task_struct pointer
*
* Description: This function returns the effective user id of the given task.
*/
function task_ns_euid:long (task:long) %{ /* pure */ /* guru */
struct task_struct *t = (struct task_struct *)(uintptr_t)STAP_ARG_task;
int64_t rc;
/* Before using the task_struct pointer, make sure it is valid to
* read. */
(void)kderef_buffer(NULL, t, sizeof(struct task_struct));
rc = from_target_user_ns(current, EUID);
if (rc < 0)
STAP_ERROR ("cannot resolve id in namespace");
else
STAP_RETURN (rc);
CATCH_DEREF_FAULT();
%}
/**
* sfunction task_prio - The priority value of the task
*
* @task: task_struct pointer
*
* Description: This function returns the priority value of the given task.
*/
function task_prio:long (task:long) %{ /* pure */
struct task_struct *t = (struct task_struct *)(uintptr_t)STAP_ARG_task;
STAP_RETVALUE = kread(&(t->prio)) - MAX_RT_PRIO;
CATCH_DEREF_FAULT();
%}
/**
* sfunction task_nice - The nice value of the task
*
* @task: task_struct pointer
*
* Description: This function returns the nice value of the given task.
*/
function task_nice:long (task:long) %{ /* pure */
struct task_struct *t = (struct task_struct *)(uintptr_t)STAP_ARG_task;
STAP_RETVALUE = kread(&(t->static_prio)) - MAX_RT_PRIO - 20;
CATCH_DEREF_FAULT();
%}
/**
* sfunction task_cpu - The scheduled cpu of the task
*
* @task: task_struct pointer
*
* Description: This function returns the scheduled cpu for the given task.
*/
function task_cpu:long (task:long)
{
if (@defined(@task(task)->cpu))
return @task(task)->cpu
else
{
ti = @choose_defined(@task(task)->stack, @task(task)->thread_info);
return @cast(ti, "thread_info", "kernel<linux/sched.h>")->cpu
}
}
/**
* sfunction task_open_file_handles - The number of open files of the task
*
* @task: task_struct pointer
*
* Description: This function returns the number of open file handlers for the given task.
*/
function task_open_file_handles:long (task:long)
%{ /* pure */
int locked = 0;
unsigned int count=0, fd, max;
struct task_struct *t;
#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,15)
/* Older kernels */
struct files_struct *f;
#else
struct files_struct *fs;
struct fdtable *f;
#endif
t = (struct task_struct *)(uintptr_t)STAP_ARG_task;
#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,15)
/* Older kernels */
f = kread(&(t->files));
#else
fs = kread(&(t->files));
f = kread(&(fs->fdt));
#endif
rcu_read_lock();
locked = 1;
max = kread(&(f->max_fds));
for (fd = 0; fd < max; fd++) {
if ( kread(&(f->fd[fd])) != NULL)
count ++;
}
STAP_RETVALUE = count;
CATCH_DEREF_FAULT();
if (locked)
rcu_read_unlock();
%}
/**
* sfunction task_max_file_handles - The max number of open files for the task
*
* @task: task_struct pointer
*
* Description: This function returns the maximum number of file handlers for the given task.
*/
function task_max_file_handles:long (task:long)
%{ /* pure */
int locked = 0;
struct task_struct *t;
#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,15)
struct files_struct *f;
#else
struct files_struct *fs;
struct fdtable *f;
#endif
t = (struct task_struct *)(uintptr_t)STAP_ARG_task;
#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,15)
f = kread(&(t->files));
#else
fs = kread (&(t->files));
f = kread(&(fs->fdt));
#endif
rcu_read_lock();
locked = 1;
STAP_RETVALUE = kread(&(f->max_fds));
CATCH_DEREF_FAULT();
if (locked)
rcu_read_unlock();
%}
/**
* sfunction task_fd_lookup - get the file struct for a task's fd
*
* @task: task_struct pointer.
* @fd: file descriptor number.
*
* Description: Returns the file struct pointer for a task's file
* descriptor.
*/
function task_fd_lookup:long(task:long, fd:long)
%{ /* pure */
struct task_struct *t = (struct task_struct *)(uintptr_t)STAP_ARG_task;
struct files_struct *files = NULL;
unsigned int fd = (unsigned int)(unsigned long)STAP_ARG_fd;
struct file *file = NULL;
/* Before using the task_struct pointer, make sure it is valid
* to read.
*
* Note that originally we called
* get_task_struct()/put_task_struct() here. However, just
* because the task_struct memory is valid to read, doesn't
* mean it is valid to *write* to this memory, which
* get_task_struct() does. So, we won't bother with
* get_task_struct()/put_task_struct(). */
(void)kderef_buffer(NULL, t, sizeof(struct task_struct));
// We should be calling get_files_struct() here, but it isn't
// exported. This means that we can't lock the
// files_struct.
files = t->files;
if (files) {
/* Before using the files_struct pointer, make sure it is
* valid to read. */
(void)kderef_buffer(NULL, files, sizeof(struct files_struct));
spin_lock(&files->file_lock);
file = fcheck_files(files, fd);
spin_unlock(&files->file_lock);
}
if (file) {
// Note that we're returning a pointer which isn't
// locked or has had its usage count increased. There
// is nothing keeping this pointer valid until we use
// it. So, before using it, it must be validated by
// callers.
STAP_RETURN((unsigned long)file);
}
else {
STAP_ERROR ("cannot find file in task");
}
CATCH_DEREF_FAULT();
%}
/**
* sfunction task_cwd_path - get the path struct pointer for a task's current working directory
*
* @task: task_struct pointer.
*/
function task_cwd_path:long(task:long)
%{ /* pure */
struct task_struct *task
= (struct task_struct *)(uintptr_t)STAP_ARG_task;
int put_task_struct_needed = 0;
// Before using the task_struct pointer, make sure it is valid
// to read.
(void)kderef_buffer(NULL, task, sizeof(struct task_struct));
// OK, we now know it is valid to read. But, is it really a
// task struct?
if (!_stp_task_struct_valid(task)) {
STAP_ERROR ("invalid task struct pointer");
}
get_task_struct(task);
put_task_struct_needed = 1;
// The kernel calls get_fs_pwd() here, which is an inlined
// function in include/linux/fs_struct.h. This function
// doesn't return a path pointer, but assumes the caller has
// allocated storage for the struct path. Instead, we're going
// to return a pointer to task->fs->pwd.
if (task->fs) {
// Sigh. On kernels before 2.6.25, the task->fs->pwd
// structure exists, but isn't a 'path'
// structure. Instead it is a 'dentry' structure. The
// 'pwd' and 'pwdmnt' (which is a 'vfsmount'
// structure) variables would both be needed to get a
// pathname. However, this function can't return 2
// items or really declare a static 'path' structure
// to put the 2 pointers in.
//
// So, on those RHEL5-era kernels, we'll just return
// NULL here.
#ifdef STAPCONF_DPATH_PATH
// Before using the task->fs pointer, let's be
// paranoid and make sure it is valid to read.
(void)kderef_buffer(NULL, task->fs, sizeof(struct fs_struct));
if (put_task_struct_needed)
put_task_struct(task);
STAP_RETURN((unsigned long)&task->fs->pwd);
#endif
}
CATCH_DEREF_FAULT();
if (put_task_struct_needed)
put_task_struct(task);
%}
/**
* sfunction current_exe_file - get the file struct pointer for the current task's executable file
*
* Description: This function returns the file struct pointer for the
* current task's executable file. Note that the file struct pointer
* isn't locked on return. The return value of this function can be
* passed to fullpath_struct_file() to get the path from the file
* struct.
*/
function current_exe_file:long()
%{ /* pure */
struct file *exe_file = NULL;
if (current == NULL) {
STAP_ERROR ("No current task");
}
// Since we're stopped inside current, it isn't going away. So
// don't bother incrementing the task's usage count by calling
// get_task_struct()/put_task_struct(). We also don't need to
// bother to try to lock current->mm.
if (current->mm) {
exe_file = stap_find_exe_file(current->mm);
if (exe_file) {
STAP_RETVALUE = (unsigned long)exe_file;
fput(exe_file);
}
}
%}
%(systemtap_v <= "3.2" %?
/**
* sfunction task_exe_file - get the file struct pointer for a task's executable file
*
* @task: task_struct pointer.
*/
function task_exe_file:long(task:long)
{
if (task == task_current()) {
return current_exe_file()
}
error("Only the exe file for the current task can be returned")
}
%)