/* *  linux/fs/proc/array.c * *  Copyright (C) 1992  by Linus Torvalds *  based on ideas by Darren Senn * * Fixes: * Michael. K. Johnson: stat,statm extensions. *                      <johnsonm@stolaf.edu> * * Pauline Middelink :  Made cmdline,envline only break at '\0's, to *                      make sure SET_PROCTITLE works. Also removed *                      bad '!' which forced address recalculation for *                      EVERY character on the current page. *                      <middelin@polyware.iaf.nl> * * Danny ter Haar    :	added cpuinfo *			<dth@cistron.nl> * * Alessandro Rubini :  profile extension. *                      <rubini@ipvvis.unipv.it> * * Jeff Tranter      :  added BogoMips field to cpuinfo *                      <Jeff_Tranter@Mitel.COM> * * Bruno Haible      :  remove 4K limit for the maps file *			<haible@ma2s2.mathematik.uni-karlsruhe.de> * * Yves Arrouye      :  remove removal of trailing spaces in get_array. *			<Yves.Arrouye@marin.fdn.fr> * * Jerome Forissier  :  added per-CPU time information to /proc/stat *                      and /proc/<pid>/cpu extension *                      <forissier@isia.cma.fr> *			- Incorporation and non-SMP safe operation *			of forissier patch in 2.1.78 by *			Hans Marcus <crowbar@concepts.nl> * * aeb@cwi.nl        :  /proc/partitions * * * Alan Cox	     :  security fixes. *			<alan@lxorguk.ukuu.org.uk> * * Al Viro           :  safe handling of mm_struct * * Gerhard Wichert   :  added BIGMEM support * Siemens AG           <Gerhard.Wichert@pdb.siemens.de> * * Al Viro & Jeff Garzik :  moved most of the thing into base.c and *			 :  proc_misc.c. The rest may eventually go into *			 :  base.c too. */ #include <linux/types.h>#include <linux/errno.h>#include <linux/time.h>#include <linux/kernel.h>#include <linux/kernel_stat.h>#include <linux/tty.h>#include <linux/string.h>#include <linux/mman.h>#include <linux/proc_fs.h>#include <linux/ioport.h>#include <linux/uaccess.h>#include <linux/io.h>#include <linux/mm.h>#include <linux/hugetlb.h>#include <linux/pagemap.h>#include <linux/swap.h>#include <linux/slab.h>#include <linux/smp.h>#include <linux/signal.h>#include <linux/highmem.h>#include <linux/file.h>#include <linux/fdtable.h>#include <linux/times.h>#include <linux/cpuset.h>#include <linux/rcupdate.h>#include <linux/delayacct.h>#include <linux/seq_file.h>#include <linux/pid_namespace.h>#include <linux/ptrace.h>#include <linux/tracehook.h>#include <linux/swapops.h> #include <asm/pgtable.h>#include <asm/processor.h>#include "internal.h" static inline void task_name(struct seq_file *m, struct task_struct *p){	int i;	char *buf, *end;	char *name;	char tcomm[sizeof(p->comm)]; 	get_task_comm(tcomm, p); 	seq_printf(m, "Name:\t");	end = m->buf + m->size;	buf = m->buf + m->count;	name = tcomm;	i = sizeof(tcomm);	while (i && (buf < end)) {		unsigned char c = *name;		name++;		i--;		*buf = c;		if (!c)			break;		if (c == '\\') {			buf++;			if (buf < end)				*buf++ = c;			continue;		}		if (c == '\n') {			*buf++ = '\\';			if (buf < end)				*buf++ = 'n';			continue;		}		buf++;	}	m->count = buf - m->buf;	seq_printf(m, "\n");} /* * The task state array is a strange "bitmap" of * reasons to sleep. Thus "running" is zero, and * you can test for combinations of others with * simple bit tests. */static const char *task_state_array[] = {	"R (running)",		/*  0 */	"S (sleeping)",		/*  1 */	"D (disk sleep)",	/*  2 */	"T (stopped)",		/*  4 */	"T (tracing stop)",	/*  8 */	"Z (zombie)",		/* 16 */	"X (dead)"		/* 32 */}; static inline const char *get_task_state(struct task_struct *tsk){	unsigned int state = (tsk->state & TASK_REPORT) | tsk->exit_state;	const char **p = &task_state_array[0]; 	while (state) {		p++;		state >>= 1;	}	return *p;} static inline void task_state(struct seq_file *m, struct pid_namespace *ns,				struct pid *pid, struct task_struct *p){	struct group_info *group_info;	int g;	struct fdtable *fdt = NULL;	const struct cred *cred;	pid_t ppid, tpid; 	rcu_read_lock();	ppid = pid_alive(p) ?		task_tgid_nr_ns(rcu_dereference(p->real_parent), ns) : 0;	tpid = 0;	if (pid_alive(p)) {		struct task_struct *tracer = tracehook_tracer_task(p);		if (tracer)			tpid = task_pid_nr_ns(tracer, ns);	}	cred = get_cred((struct cred *) __task_cred(p));	seq_printf(m,		"State:\t%s\n"		"Tgid:\t%d\n"		"Pid:\t%d\n"		"PPid:\t%d\n"		"TracerPid:\t%d\n"		"Uid:\t%d\t%d\t%d\t%d\n"		"Gid:\t%d\t%d\t%d\t%d\n",		get_task_state(p),		task_tgid_nr_ns(p, ns),		pid_nr_ns(pid, ns),		ppid, tpid,		cred->uid, cred->euid, cred->suid, cred->fsuid,		cred->gid, cred->egid, cred->sgid, cred->fsgid); 	task_lock(p);	if (p->files)		fdt = files_fdtable(p->files);	seq_printf(m,		"FDSize:\t%d\n"		"Groups:\t",		fdt ? fdt->max_fds : 0);	rcu_read_unlock(); 	group_info = cred->group_info;	task_unlock(p); 	for (g = 0; g < min(group_info->ngroups, NGROUPS_SMALL); g++)		seq_printf(m, "%d ", GROUP_AT(group_info, g));	put_cred(cred); 	seq_printf(m, "\n");} static void render_sigset_t(struct seq_file *m, const char *header,				sigset_t *set){	int i; 	seq_printf(m, "%s", header); 	i = _NSIG;	do {		int x = 0; 		i -= 4;		if (sigismember(set, i+1)) x |= 1;		if (sigismember(set, i+2)) x |= 2;		if (sigismember(set, i+3)) x |= 4;		if (sigismember(set, i+4)) x |= 8;		seq_printf(m, "%x", x);	} while (i >= 4); 	seq_printf(m, "\n");} static void collect_sigign_sigcatch(struct task_struct *p, sigset_t *ign,				    sigset_t *catch){	struct k_sigaction *k;	int i; 	k = p->sighand->action;	for (i = 1; i <= _NSIG; ++i, ++k) {		if (k->sa.sa_handler == SIG_IGN)			sigaddset(ign, i);		else if (k->sa.sa_handler != SIG_DFL)			sigaddset(catch, i);	}} static inline void task_sig(struct seq_file *m, struct task_struct *p){	unsigned long flags;	sigset_t pending, shpending, blocked, ignored, caught;	int num_threads = 0;	unsigned long qsize = 0;	unsigned long qlim = 0; 	sigemptyset(&pending);	sigemptyset(&shpending);	sigemptyset(&blocked);	sigemptyset(&ignored);	sigemptyset(&caught); 	if (lock_task_sighand(p, &flags)) {		pending = p->pending.signal;		shpending = p->signal->shared_pending.signal;		blocked = p->blocked;		collect_sigign_sigcatch(p, &ignored, &caught);		num_threads = atomic_read(&p->signal->count);		qsize = atomic_read(&__task_cred(p)->user->sigpending);		qlim = p->signal->rlim[RLIMIT_SIGPENDING].rlim_cur;		unlock_task_sighand(p, &flags);	} 	seq_printf(m, "Threads:\t%d\n", num_threads);	seq_printf(m, "SigQ:\t%lu/%lu\n", qsize, qlim); 	/* render them all */	render_sigset_t(m, "SigPnd:\t", &pending);	render_sigset_t(m, "ShdPnd:\t", &shpending);	render_sigset_t(m, "SigBlk:\t", &blocked);	render_sigset_t(m, "SigIgn:\t", &ignored);	render_sigset_t(m, "SigCgt:\t", &caught);} static void render_cap_t(struct seq_file *m, const char *header,			kernel_cap_t *a){	unsigned __capi; 	seq_printf(m, "%s", header);	CAP_FOR_EACH_U32(__capi) {		seq_printf(m, "%08x",			   a->cap[(_KERNEL_CAPABILITY_U32S-1) - __capi]);	}	seq_printf(m, "\n");} static inline void task_cap(struct seq_file *m, struct task_struct *p){	const struct cred *cred;	kernel_cap_t cap_inheritable, cap_permitted, cap_effective, cap_bset; 	rcu_read_lock();	cred = __task_cred(p);	cap_inheritable	= cred->cap_inheritable;	cap_permitted	= cred->cap_permitted;	cap_effective	= cred->cap_effective;	cap_bset	= cred->cap_bset;	rcu_read_unlock(); 	render_cap_t(m, "CapInh:\t", &cap_inheritable);	render_cap_t(m, "CapPrm:\t", &cap_permitted);	render_cap_t(m, "CapEff:\t", &cap_effective);	render_cap_t(m, "CapBnd:\t", &cap_bset);} static inline void task_context_switch_counts(struct seq_file *m,						struct task_struct *p){	seq_printf(m,	"voluntary_ctxt_switches:\t%lu\n"			"nonvoluntary_ctxt_switches:\t%lu\n",			p->nvcsw,			p->nivcsw);} #ifdef CONFIG_MMU struct stack_stats {	struct vm_area_struct *vma;	unsigned long	startpage;	unsigned long	usage;}; static int stack_usage_pte_range(pmd_t *pmd, unsigned long addr,				unsigned long end, struct mm_walk *walk){	struct stack_stats *ss = walk->private;	struct vm_area_struct *vma = ss->vma;	pte_t *pte, ptent;	spinlock_t *ptl;	int ret = 0; 	pte = pte_offset_map_lock(vma->vm_mm, pmd, addr, &ptl);	for (; addr != end; pte++, addr += PAGE_SIZE) {		ptent = *pte; #ifdef CONFIG_STACK_GROWSUP		if (pte_present(ptent) || is_swap_pte(ptent))			ss->usage = addr - ss->startpage + PAGE_SIZE;#else		if (pte_present(ptent) || is_swap_pte(ptent)) {			ss->usage = ss->startpage - addr + PAGE_SIZE;			pte++;			ret = 1;			break;		}#endif	}	pte_unmap_unlock(pte - 1, ptl);	cond_resched();	return ret;} static inline unsigned long get_stack_usage_in_bytes(struct vm_area_struct *vma,				struct task_struct *task){	struct stack_stats ss;	struct mm_walk stack_walk = {		.pmd_entry = stack_usage_pte_range,		.mm = vma->vm_mm,		.private = &ss,	}; 	if (!vma->vm_mm || is_vm_hugetlb_page(vma))		return 0; 	ss.vma = vma;	ss.startpage = task->stack_start & PAGE_MASK;	ss.usage = 0; #ifdef CONFIG_STACK_GROWSUP	walk_page_range(KSTK_ESP(task) & PAGE_MASK, vma->vm_end,		&stack_walk);#else	walk_page_range(vma->vm_start, (KSTK_ESP(task) & PAGE_MASK) + PAGE_SIZE,		&stack_walk);#endif	return ss.usage;} static inline void task_show_stack_usage(struct seq_file *m,						struct task_struct *task){	struct vm_area_struct	*vma;	struct mm_struct	*mm = get_task_mm(task); 	if (mm) {		down_read(&mm->mmap_sem);		vma = find_vma(mm, task->stack_start);		if (vma)			seq_printf(m, "Stack usage:\t%lu kB\n",				get_stack_usage_in_bytes(vma, task) >> 10); 		up_read(&mm->mmap_sem);		mmput(mm);	}}#elsestatic void task_show_stack_usage(struct seq_file *m, struct task_struct *task){}#endif		/* CONFIG_MMU */ int proc_pid_status(struct seq_file *m, struct pid_namespace *ns,			struct pid *pid, struct task_struct *task){	struct mm_struct *mm = get_task_mm(task); 	task_name(m, task);	task_state(m, ns, pid, task); 	if (mm) {		task_mem(m, mm);		mmput(mm);	}	task_sig(m, task);	task_cap(m, task);	cpuset_task_status_allowed(m, task);#if defined(CONFIG_S390)	task_show_regs(m, task);#endif	task_context_switch_counts(m, task);	task_show_stack_usage(m, task);	return 0;} static int do_task_stat(struct seq_file *m, struct pid_namespace *ns,			struct pid *pid, struct task_struct *task, int whole){	unsigned long vsize, eip, esp, wchan = ~0UL;	long priority, nice;	int tty_pgrp = -1, tty_nr = 0;	sigset_t sigign, sigcatch;	char state;	pid_t ppid = 0, pgid = -1, sid = -1;	int num_threads = 0;	int permitted;	struct mm_struct *mm;	unsigned long long start_time;	unsigned long cmin_flt = 0, cmaj_flt = 0;	unsigned long  min_flt = 0,  maj_flt = 0;	cputime_t cutime, cstime, utime, stime;	cputime_t cgtime, gtime;	unsigned long rsslim = 0;	char tcomm[sizeof(task->comm)];	unsigned long flags; 	state = *get_task_state(task);	vsize = eip = esp = 0;	permitted = ptrace_may_access(task, PTRACE_MODE_READ);	mm = get_task_mm(task);	if (mm) {		vsize = task_vsize(mm);		if (permitted) {			eip = KSTK_EIP(task);			esp = KSTK_ESP(task);		}	} 	get_task_comm(tcomm, task); 	sigemptyset(&sigign);	sigemptyset(&sigcatch);	cutime = cstime = utime = stime = cputime_zero;	cgtime = gtime = cputime_zero; 	if (lock_task_sighand(task, &flags)) {		struct signal_struct *sig = task->signal; 		if (sig->tty) {			struct pid *pgrp = tty_get_pgrp(sig->tty);			tty_pgrp = pid_nr_ns(pgrp, ns);			put_pid(pgrp);			tty_nr = new_encode_dev(tty_devnum(sig->tty));		} 		num_threads = atomic_read(&sig->count);		collect_sigign_sigcatch(task, &sigign, &sigcatch); 		cmin_flt = sig->cmin_flt;		cmaj_flt = sig->cmaj_flt;		cutime = sig->cutime;		cstime = sig->cstime;		cgtime = sig->cgtime;		rsslim = sig->rlim[RLIMIT_RSS].rlim_cur; 		/* add up live thread stats at the group level */		if (whole) {			struct task_cputime cputime;			struct task_struct *t = task;			do {

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