xref: /openbmc/linux/fs/proc/array.c (revision 78c99ba1) 
1 /*
2  *  linux/fs/proc/array.c
3  *
4  *  Copyright (C) 1992  by Linus Torvalds
5  *  based on ideas by Darren Senn
6  *
7  * Fixes:
8  * Michael. K. Johnson: stat,statm extensions.
9  *                      <johnsonm@stolaf.edu>
10  *
11  * Pauline Middelink :  Made cmdline,envline only break at '\0's, to
12  *                      make sure SET_PROCTITLE works. Also removed
13  *                      bad '!' which forced address recalculation for
14  *                      EVERY character on the current page.
15  *                      <middelin@polyware.iaf.nl>
16  *
17  * Danny ter Haar    :	added cpuinfo
18  *			<dth@cistron.nl>
19  *
20  * Alessandro Rubini :  profile extension.
21  *                      <rubini@ipvvis.unipv.it>
22  *
23  * Jeff Tranter      :  added BogoMips field to cpuinfo
24  *                      <Jeff_Tranter@Mitel.COM>
25  *
26  * Bruno Haible      :  remove 4K limit for the maps file
27  *			<haible@ma2s2.mathematik.uni-karlsruhe.de>
28  *
29  * Yves Arrouye      :  remove removal of trailing spaces in get_array.
30  *			<Yves.Arrouye@marin.fdn.fr>
31  *
32  * Jerome Forissier  :  added per-CPU time information to /proc/stat
33  *                      and /proc/<pid>/cpu extension
34  *                      <forissier@isia.cma.fr>
35  *			- Incorporation and non-SMP safe operation
36  *			of forissier patch in 2.1.78 by
37  *			Hans Marcus <crowbar@concepts.nl>
38  *
39  * aeb@cwi.nl        :  /proc/partitions
40  *
41  *
42  * Alan Cox	     :  security fixes.
43  *			<alan@lxorguk.ukuu.org.uk>
44  *
45  * Al Viro           :  safe handling of mm_struct
46  *
47  * Gerhard Wichert   :  added BIGMEM support
48  * Siemens AG           <Gerhard.Wichert@pdb.siemens.de>
49  *
50  * Al Viro & Jeff Garzik :  moved most of the thing into base.c and
51  *			 :  proc_misc.c. The rest may eventually go into
52  *			 :  base.c too.
53  */
54 
55 #include <linux/types.h>
56 #include <linux/errno.h>
57 #include <linux/time.h>
58 #include <linux/kernel.h>
59 #include <linux/kernel_stat.h>
60 #include <linux/tty.h>
61 #include <linux/string.h>
62 #include <linux/mman.h>
63 #include <linux/proc_fs.h>
64 #include <linux/ioport.h>
65 #include <linux/uaccess.h>
66 #include <linux/io.h>
67 #include <linux/mm.h>
68 #include <linux/hugetlb.h>
69 #include <linux/pagemap.h>
70 #include <linux/swap.h>
71 #include <linux/slab.h>
72 #include <linux/smp.h>
73 #include <linux/signal.h>
74 #include <linux/highmem.h>
75 #include <linux/file.h>
76 #include <linux/fdtable.h>
77 #include <linux/times.h>
78 #include <linux/cpuset.h>
79 #include <linux/rcupdate.h>
80 #include <linux/delayacct.h>
81 #include <linux/seq_file.h>
82 #include <linux/pid_namespace.h>
83 #include <linux/ptrace.h>
84 #include <linux/tracehook.h>
85 
86 #include <asm/pgtable.h>
87 #include <asm/processor.h>
88 #include "internal.h"
89 
90 static inline void task_name(struct seq_file *m, struct task_struct *p)
91 {
92 	int i;
93 	char *buf, *end;
94 	char *name;
95 	char tcomm[sizeof(p->comm)];
96 
97 	get_task_comm(tcomm, p);
98 
99 	seq_printf(m, "Name:\t");
100 	end = m->buf + m->size;
101 	buf = m->buf + m->count;
102 	name = tcomm;
103 	i = sizeof(tcomm);
104 	while (i && (buf < end)) {
105 		unsigned char c = *name;
106 		name++;
107 		i--;
108 		*buf = c;
109 		if (!c)
110 			break;
111 		if (c == '\\') {
112 			buf++;
113 			if (buf < end)
114 				*buf++ = c;
115 			continue;
116 		}
117 		if (c == '\n') {
118 			*buf++ = '\\';
119 			if (buf < end)
120 				*buf++ = 'n';
121 			continue;
122 		}
123 		buf++;
124 	}
125 	m->count = buf - m->buf;
126 	seq_printf(m, "\n");
127 }
128 
129 /*
130  * The task state array is a strange "bitmap" of
131  * reasons to sleep. Thus "running" is zero, and
132  * you can test for combinations of others with
133  * simple bit tests.
134  */
135 static const char *task_state_array[] = {
136 	"R (running)",		/*  0 */
137 	"S (sleeping)",		/*  1 */
138 	"D (disk sleep)",	/*  2 */
139 	"T (stopped)",		/*  4 */
140 	"T (tracing stop)",	/*  8 */
141 	"Z (zombie)",		/* 16 */
142 	"X (dead)"		/* 32 */
143 };
144 
145 static inline const char *get_task_state(struct task_struct *tsk)
146 {
147 	unsigned int state = (tsk->state & TASK_REPORT) | tsk->exit_state;
148 	const char **p = &task_state_array[0];
149 
150 	while (state) {
151 		p++;
152 		state >>= 1;
153 	}
154 	return *p;
155 }
156 
157 static inline void task_state(struct seq_file *m, struct pid_namespace *ns,
158 				struct pid *pid, struct task_struct *p)
159 {
160 	struct group_info *group_info;
161 	int g;
162 	struct fdtable *fdt = NULL;
163 	const struct cred *cred;
164 	pid_t ppid, tpid;
165 
166 	rcu_read_lock();
167 	ppid = pid_alive(p) ?
168 		task_tgid_nr_ns(rcu_dereference(p->real_parent), ns) : 0;
169 	tpid = 0;
170 	if (pid_alive(p)) {
171 		struct task_struct *tracer = tracehook_tracer_task(p);
172 		if (tracer)
173 			tpid = task_pid_nr_ns(tracer, ns);
174 	}
175 	cred = get_cred((struct cred *) __task_cred(p));
176 	seq_printf(m,
177 		"State:\t%s\n"
178 		"Tgid:\t%d\n"
179 		"Pid:\t%d\n"
180 		"PPid:\t%d\n"
181 		"TracerPid:\t%d\n"
182 		"Uid:\t%d\t%d\t%d\t%d\n"
183 		"Gid:\t%d\t%d\t%d\t%d\n",
184 		get_task_state(p),
185 		task_tgid_nr_ns(p, ns),
186 		pid_nr_ns(pid, ns),
187 		ppid, tpid,
188 		cred->uid, cred->euid, cred->suid, cred->fsuid,
189 		cred->gid, cred->egid, cred->sgid, cred->fsgid);
190 
191 	task_lock(p);
192 	if (p->files)
193 		fdt = files_fdtable(p->files);
194 	seq_printf(m,
195 		"FDSize:\t%d\n"
196 		"Groups:\t",
197 		fdt ? fdt->max_fds : 0);
198 	rcu_read_unlock();
199 
200 	group_info = cred->group_info;
201 	task_unlock(p);
202 
203 	for (g = 0; g < min(group_info->ngroups, NGROUPS_SMALL); g++)
204 		seq_printf(m, "%d ", GROUP_AT(group_info, g));
205 	put_cred(cred);
206 
207 	seq_printf(m, "\n");
208 }
209 
210 static void render_sigset_t(struct seq_file *m, const char *header,
211 				sigset_t *set)
212 {
213 	int i;
214 
215 	seq_printf(m, "%s", header);
216 
217 	i = _NSIG;
218 	do {
219 		int x = 0;
220 
221 		i -= 4;
222 		if (sigismember(set, i+1)) x |= 1;
223 		if (sigismember(set, i+2)) x |= 2;
224 		if (sigismember(set, i+3)) x |= 4;
225 		if (sigismember(set, i+4)) x |= 8;
226 		seq_printf(m, "%x", x);
227 	} while (i >= 4);
228 
229 	seq_printf(m, "\n");
230 }
231 
232 static void collect_sigign_sigcatch(struct task_struct *p, sigset_t *ign,
233 				    sigset_t *catch)
234 {
235 	struct k_sigaction *k;
236 	int i;
237 
238 	k = p->sighand->action;
239 	for (i = 1; i <= _NSIG; ++i, ++k) {
240 		if (k->sa.sa_handler == SIG_IGN)
241 			sigaddset(ign, i);
242 		else if (k->sa.sa_handler != SIG_DFL)
243 			sigaddset(catch, i);
244 	}
245 }
246 
247 static inline void task_sig(struct seq_file *m, struct task_struct *p)
248 {
249 	unsigned long flags;
250 	sigset_t pending, shpending, blocked, ignored, caught;
251 	int num_threads = 0;
252 	unsigned long qsize = 0;
253 	unsigned long qlim = 0;
254 
255 	sigemptyset(&pending);
256 	sigemptyset(&shpending);
257 	sigemptyset(&blocked);
258 	sigemptyset(&ignored);
259 	sigemptyset(&caught);
260 
261 	if (lock_task_sighand(p, &flags)) {
262 		pending = p->pending.signal;
263 		shpending = p->signal->shared_pending.signal;
264 		blocked = p->blocked;
265 		collect_sigign_sigcatch(p, &ignored, &caught);
266 		num_threads = atomic_read(&p->signal->count);
267 		qsize = atomic_read(&__task_cred(p)->user->sigpending);
268 		qlim = p->signal->rlim[RLIMIT_SIGPENDING].rlim_cur;
269 		unlock_task_sighand(p, &flags);
270 	}
271 
272 	seq_printf(m, "Threads:\t%d\n", num_threads);
273 	seq_printf(m, "SigQ:\t%lu/%lu\n", qsize, qlim);
274 
275 	/* render them all */
276 	render_sigset_t(m, "SigPnd:\t", &pending);
277 	render_sigset_t(m, "ShdPnd:\t", &shpending);
278 	render_sigset_t(m, "SigBlk:\t", &blocked);
279 	render_sigset_t(m, "SigIgn:\t", &ignored);
280 	render_sigset_t(m, "SigCgt:\t", &caught);
281 }
282 
283 static void render_cap_t(struct seq_file *m, const char *header,
284 			kernel_cap_t *a)
285 {
286 	unsigned __capi;
287 
288 	seq_printf(m, "%s", header);
289 	CAP_FOR_EACH_U32(__capi) {
290 		seq_printf(m, "%08x",
291 			   a->cap[(_KERNEL_CAPABILITY_U32S-1) - __capi]);
292 	}
293 	seq_printf(m, "\n");
294 }
295 
296 static inline void task_cap(struct seq_file *m, struct task_struct *p)
297 {
298 	const struct cred *cred;
299 	kernel_cap_t cap_inheritable, cap_permitted, cap_effective, cap_bset;
300 
301 	rcu_read_lock();
302 	cred = __task_cred(p);
303 	cap_inheritable	= cred->cap_inheritable;
304 	cap_permitted	= cred->cap_permitted;
305 	cap_effective	= cred->cap_effective;
306 	cap_bset	= cred->cap_bset;
307 	rcu_read_unlock();
308 
309 	render_cap_t(m, "CapInh:\t", &cap_inheritable);
310 	render_cap_t(m, "CapPrm:\t", &cap_permitted);
311 	render_cap_t(m, "CapEff:\t", &cap_effective);
312 	render_cap_t(m, "CapBnd:\t", &cap_bset);
313 }
314 
315 static inline void task_context_switch_counts(struct seq_file *m,
316 						struct task_struct *p)
317 {
318 	seq_printf(m,	"voluntary_ctxt_switches:\t%lu\n"
319 			"nonvoluntary_ctxt_switches:\t%lu\n",
320 			p->nvcsw,
321 			p->nivcsw);
322 }
323 
324 int proc_pid_status(struct seq_file *m, struct pid_namespace *ns,
325 			struct pid *pid, struct task_struct *task)
326 {
327 	struct mm_struct *mm = get_task_mm(task);
328 
329 	task_name(m, task);
330 	task_state(m, ns, pid, task);
331 
332 	if (mm) {
333 		task_mem(m, mm);
334 		mmput(mm);
335 	}
336 	task_sig(m, task);
337 	task_cap(m, task);
338 	cpuset_task_status_allowed(m, task);
339 #if defined(CONFIG_S390)
340 	task_show_regs(m, task);
341 #endif
342 	task_context_switch_counts(m, task);
343 	return 0;
344 }
345 
346 static int do_task_stat(struct seq_file *m, struct pid_namespace *ns,
347 			struct pid *pid, struct task_struct *task, int whole)
348 {
349 	unsigned long vsize, eip, esp, wchan = ~0UL;
350 	long priority, nice;
351 	int tty_pgrp = -1, tty_nr = 0;
352 	sigset_t sigign, sigcatch;
353 	char state;
354 	pid_t ppid = 0, pgid = -1, sid = -1;
355 	int num_threads = 0;
356 	int permitted;
357 	struct mm_struct *mm;
358 	unsigned long long start_time;
359 	unsigned long cmin_flt = 0, cmaj_flt = 0;
360 	unsigned long  min_flt = 0,  maj_flt = 0;
361 	cputime_t cutime, cstime, utime, stime;
362 	cputime_t cgtime, gtime;
363 	unsigned long rsslim = 0;
364 	char tcomm[sizeof(task->comm)];
365 	unsigned long flags;
366 
367 	state = *get_task_state(task);
368 	vsize = eip = esp = 0;
369 	permitted = ptrace_may_access(task, PTRACE_MODE_READ);
370 	mm = get_task_mm(task);
371 	if (mm) {
372 		vsize = task_vsize(mm);
373 		if (permitted) {
374 			eip = KSTK_EIP(task);
375 			esp = KSTK_ESP(task);
376 		}
377 	}
378 
379 	get_task_comm(tcomm, task);
380 
381 	sigemptyset(&sigign);
382 	sigemptyset(&sigcatch);
383 	cutime = cstime = utime = stime = cputime_zero;
384 	cgtime = gtime = cputime_zero;
385 
386 	if (lock_task_sighand(task, &flags)) {
387 		struct signal_struct *sig = task->signal;
388 
389 		if (sig->tty) {
390 			struct pid *pgrp = tty_get_pgrp(sig->tty);
391 			tty_pgrp = pid_nr_ns(pgrp, ns);
392 			put_pid(pgrp);
393 			tty_nr = new_encode_dev(tty_devnum(sig->tty));
394 		}
395 
396 		num_threads = atomic_read(&sig->count);
397 		collect_sigign_sigcatch(task, &sigign, &sigcatch);
398 
399 		cmin_flt = sig->cmin_flt;
400 		cmaj_flt = sig->cmaj_flt;
401 		cutime = sig->cutime;
402 		cstime = sig->cstime;
403 		cgtime = sig->cgtime;
404 		rsslim = sig->rlim[RLIMIT_RSS].rlim_cur;
405 
406 		/* add up live thread stats at the group level */
407 		if (whole) {
408 			struct task_cputime cputime;
409 			struct task_struct *t = task;
410 			do {
411 				min_flt += t->min_flt;
412 				maj_flt += t->maj_flt;
413 				gtime = cputime_add(gtime, task_gtime(t));
414 				t = next_thread(t);
415 			} while (t != task);
416 
417 			min_flt += sig->min_flt;
418 			maj_flt += sig->maj_flt;
419 			thread_group_cputime(task, &cputime);
420 			utime = cputime.utime;
421 			stime = cputime.stime;
422 			gtime = cputime_add(gtime, sig->gtime);
423 		}
424 
425 		sid = task_session_nr_ns(task, ns);
426 		ppid = task_tgid_nr_ns(task->real_parent, ns);
427 		pgid = task_pgrp_nr_ns(task, ns);
428 
429 		unlock_task_sighand(task, &flags);
430 	}
431 
432 	if (permitted && (!whole || num_threads < 2))
433 		wchan = get_wchan(task);
434 	if (!whole) {
435 		min_flt = task->min_flt;
436 		maj_flt = task->maj_flt;
437 		utime = task_utime(task);
438 		stime = task_stime(task);
439 		gtime = task_gtime(task);
440 	}
441 
442 	/* scale priority and nice values from timeslices to -20..20 */
443 	/* to make it look like a "normal" Unix priority/nice value  */
444 	priority = task_prio(task);
445 	nice = task_nice(task);
446 
447 	/* Temporary variable needed for gcc-2.96 */
448 	/* convert timespec -> nsec*/
449 	start_time =
450 		(unsigned long long)task->real_start_time.tv_sec * NSEC_PER_SEC
451 				+ task->real_start_time.tv_nsec;
452 	/* convert nsec -> ticks */
453 	start_time = nsec_to_clock_t(start_time);
454 
455 	seq_printf(m, "%d (%s) %c %d %d %d %d %d %u %lu \
456 %lu %lu %lu %lu %lu %ld %ld %ld %ld %d 0 %llu %lu %ld %lu %lu %lu %lu %lu \
457 %lu %lu %lu %lu %lu %lu %lu %lu %d %d %u %u %llu %lu %ld\n",
458 		pid_nr_ns(pid, ns),
459 		tcomm,
460 		state,
461 		ppid,
462 		pgid,
463 		sid,
464 		tty_nr,
465 		tty_pgrp,
466 		task->flags,
467 		min_flt,
468 		cmin_flt,
469 		maj_flt,
470 		cmaj_flt,
471 		cputime_to_clock_t(utime),
472 		cputime_to_clock_t(stime),
473 		cputime_to_clock_t(cutime),
474 		cputime_to_clock_t(cstime),
475 		priority,
476 		nice,
477 		num_threads,
478 		start_time,
479 		vsize,
480 		mm ? get_mm_rss(mm) : 0,
481 		rsslim,
482 		mm ? mm->start_code : 0,
483 		mm ? mm->end_code : 0,
484 		(permitted && mm) ? mm->start_stack : 0,
485 		esp,
486 		eip,
487 		/* The signal information here is obsolete.
488 		 * It must be decimal for Linux 2.0 compatibility.
489 		 * Use /proc/#/status for real-time signals.
490 		 */
491 		task->pending.signal.sig[0] & 0x7fffffffUL,
492 		task->blocked.sig[0] & 0x7fffffffUL,
493 		sigign      .sig[0] & 0x7fffffffUL,
494 		sigcatch    .sig[0] & 0x7fffffffUL,
495 		wchan,
496 		0UL,
497 		0UL,
498 		task->exit_signal,
499 		task_cpu(task),
500 		task->rt_priority,
501 		task->policy,
502 		(unsigned long long)delayacct_blkio_ticks(task),
503 		cputime_to_clock_t(gtime),
504 		cputime_to_clock_t(cgtime));
505 	if (mm)
506 		mmput(mm);
507 	return 0;
508 }
509 
510 int proc_tid_stat(struct seq_file *m, struct pid_namespace *ns,
511 			struct pid *pid, struct task_struct *task)
512 {
513 	return do_task_stat(m, ns, pid, task, 0);
514 }
515 
516 int proc_tgid_stat(struct seq_file *m, struct pid_namespace *ns,
517 			struct pid *pid, struct task_struct *task)
518 {
519 	return do_task_stat(m, ns, pid, task, 1);
520 }
521 
522 int proc_pid_statm(struct seq_file *m, struct pid_namespace *ns,
523 			struct pid *pid, struct task_struct *task)
524 {
525 	int size = 0, resident = 0, shared = 0, text = 0, lib = 0, data = 0;
526 	struct mm_struct *mm = get_task_mm(task);
527 
528 	if (mm) {
529 		size = task_statm(mm, &shared, &text, &data, &resident);
530 		mmput(mm);
531 	}
532 	seq_printf(m, "%d %d %d %d %d %d %d\n",
533 			size, resident, shared, text, lib, data, 0);
534 
535 	return 0;
536 }
537