// SPDX-License-Identifier: GPL-2.0/* *  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/sched/mm.h>#include <linux/sched/numa_balancing.h>#include <linux/sched/task_stack.h>#include <linux/sched/task.h>#include <linux/sched/cputime.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/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/prctl.h>#include <linux/ptrace.h>#include <linux/tracehook.h>#include <linux/string_helpers.h>#include <linux/user_namespace.h>#include <linux/fs_struct.h> #include <asm/processor.h>#include "internal.h" void proc_task_name(struct seq_file *m, struct task_struct *p, bool escape){	char *buf;	size_t size;	char tcomm[64];	int ret; 	if (p->flags & PF_WQ_WORKER)		wq_worker_comm(tcomm, sizeof(tcomm), p);	else		__get_task_comm(tcomm, sizeof(tcomm), p); 	size = seq_get_buf(m, &buf);	if (escape) {		ret = string_escape_str(tcomm, buf, size,					ESCAPE_SPACE | ESCAPE_SPECIAL, "\n\\");		if (ret >= size)			ret = -1;	} else {		ret = strscpy(buf, tcomm, size);	} 	seq_commit(m, ret);} /* * 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 * const task_state_array[] = { 	/* states in TASK_REPORT: */	"R (running)",		/* 0x00 */	"S (sleeping)",		/* 0x01 */	"D (disk sleep)",	/* 0x02 */	"T (stopped)",		/* 0x04 */	"t (tracing stop)",	/* 0x08 */	"X (dead)",		/* 0x10 */	"Z (zombie)",		/* 0x20 */	"P (parked)",		/* 0x40 */ 	/* states beyond TASK_REPORT: */	"I (idle)",		/* 0x80 */}; static inline const char *get_task_state(struct task_struct *tsk){	BUILD_BUG_ON(1 + ilog2(TASK_REPORT_MAX) != ARRAY_SIZE(task_state_array));	return task_state_array[task_state_index(tsk)];} static inline void task_state(struct seq_file *m, struct pid_namespace *ns,				struct pid *pid, struct task_struct *p){	struct user_namespace *user_ns = seq_user_ns(m);	struct group_info *group_info;	int g, umask = -1;	struct task_struct *tracer;	const struct cred *cred;	pid_t ppid, tpid = 0, tgid, ngid;	unsigned int max_fds = 0; 	rcu_read_lock();	ppid = pid_alive(p) ?		task_tgid_nr_ns(rcu_dereference(p->real_parent), ns) : 0; 	tracer = ptrace_parent(p);	if (tracer)		tpid = task_pid_nr_ns(tracer, ns); 	tgid = task_tgid_nr_ns(p, ns);	ngid = task_numa_group_id(p);	cred = get_task_cred(p); 	task_lock(p);	if (p->fs)		umask = p->fs->umask;	if (p->files)		max_fds = files_fdtable(p->files)->max_fds;	task_unlock(p);	rcu_read_unlock(); 	if (umask >= 0)		seq_printf(m, "Umask:\t%#04o\n", umask);	seq_puts(m, "State:\t");	seq_puts(m, get_task_state(p)); 	seq_put_decimal_ull(m, "\nTgid:\t", tgid);	seq_put_decimal_ull(m, "\nNgid:\t", ngid);	seq_put_decimal_ull(m, "\nPid:\t", pid_nr_ns(pid, ns));	seq_put_decimal_ull(m, "\nPPid:\t", ppid);	seq_put_decimal_ull(m, "\nTracerPid:\t", tpid);	seq_put_decimal_ull(m, "\nUid:\t", from_kuid_munged(user_ns, cred->uid));	seq_put_decimal_ull(m, "\t", from_kuid_munged(user_ns, cred->euid));	seq_put_decimal_ull(m, "\t", from_kuid_munged(user_ns, cred->suid));	seq_put_decimal_ull(m, "\t", from_kuid_munged(user_ns, cred->fsuid));	seq_put_decimal_ull(m, "\nGid:\t", from_kgid_munged(user_ns, cred->gid));	seq_put_decimal_ull(m, "\t", from_kgid_munged(user_ns, cred->egid));	seq_put_decimal_ull(m, "\t", from_kgid_munged(user_ns, cred->sgid));	seq_put_decimal_ull(m, "\t", from_kgid_munged(user_ns, cred->fsgid));	seq_put_decimal_ull(m, "\nFDSize:\t", max_fds); 	seq_puts(m, "\nGroups:\t");	group_info = cred->group_info;	for (g = 0; g < group_info->ngroups; g++)		seq_put_decimal_ull(m, g ? " " : "",				from_kgid_munged(user_ns, group_info->gid[g]));	put_cred(cred);	/* Trailing space shouldn't have been added in the first place. */	seq_putc(m, ' '); #ifdef CONFIG_PID_NS	seq_puts(m, "\nNStgid:");	for (g = ns->level; g <= pid->level; g++)		seq_put_decimal_ull(m, "\t", task_tgid_nr_ns(p, pid->numbers[g].ns));	seq_puts(m, "\nNSpid:");	for (g = ns->level; g <= pid->level; g++)		seq_put_decimal_ull(m, "\t", task_pid_nr_ns(p, pid->numbers[g].ns));	seq_puts(m, "\nNSpgid:");	for (g = ns->level; g <= pid->level; g++)		seq_put_decimal_ull(m, "\t", task_pgrp_nr_ns(p, pid->numbers[g].ns));	seq_puts(m, "\nNSsid:");	for (g = ns->level; g <= pid->level; g++)		seq_put_decimal_ull(m, "\t", task_session_nr_ns(p, pid->numbers[g].ns));#endif	seq_putc(m, '\n');} void render_sigset_t(struct seq_file *m, const char *header,				sigset_t *set){	int i; 	seq_puts(m, 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_putc(m, hex_asc[x]);	} while (i >= 4); 	seq_putc(m, '\n');} static void collect_sigign_sigcatch(struct task_struct *p, sigset_t *sigign,				    sigset_t *sigcatch){	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(sigign, i);		else if (k->sa.sa_handler != SIG_DFL)			sigaddset(sigcatch, 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 int 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 = get_nr_threads(p);		rcu_read_lock();  /* FIXME: is this correct? */		qsize = atomic_read(&__task_cred(p)->user->sigpending);		rcu_read_unlock();		qlim = task_rlimit(p, RLIMIT_SIGPENDING);		unlock_task_sighand(p, &flags);	} 	seq_put_decimal_ull(m, "Threads:\t", num_threads);	seq_put_decimal_ull(m, "\nSigQ:\t", qsize);	seq_put_decimal_ull(m, "/", qlim); 	/* render them all */	render_sigset_t(m, "\nSigPnd:\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_puts(m, header);	CAP_FOR_EACH_U32(__capi) {		seq_put_hex_ll(m, NULL,			   a->cap[CAP_LAST_U32 - __capi], 8);	}	seq_putc(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, cap_ambient; 	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;	cap_ambient	= cred->cap_ambient;	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);	render_cap_t(m, "CapAmb:\t", &cap_ambient);} static inline void task_seccomp(struct seq_file *m, struct task_struct *p){	seq_put_decimal_ull(m, "NoNewPrivs:\t", task_no_new_privs(p));#ifdef CONFIG_SECCOMP	seq_put_decimal_ull(m, "\nSeccomp:\t", p->seccomp.mode);#endif	seq_puts(m, "\nSpeculation_Store_Bypass:\t");	switch (arch_prctl_spec_ctrl_get(p, PR_SPEC_STORE_BYPASS)) {	case -EINVAL:		seq_puts(m, "unknown");		break;	case PR_SPEC_NOT_AFFECTED:		seq_puts(m, "not vulnerable");		break;	case PR_SPEC_PRCTL | PR_SPEC_FORCE_DISABLE:		seq_puts(m, "thread force mitigated");		break;	case PR_SPEC_PRCTL | PR_SPEC_DISABLE:		seq_puts(m, "thread mitigated");		break;	case PR_SPEC_PRCTL | PR_SPEC_ENABLE:		seq_puts(m, "thread vulnerable");		break;	case PR_SPEC_DISABLE:		seq_puts(m, "globally mitigated");		break;	default:		seq_puts(m, "vulnerable");		break;	}	seq_putc(m, '\n');} static inline void task_context_switch_counts(struct seq_file *m,						struct task_struct *p){	seq_put_decimal_ull(m, "voluntary_ctxt_switches:\t", p->nvcsw);	seq_put_decimal_ull(m, "\nnonvoluntary_ctxt_switches:\t", p->nivcsw);	seq_putc(m, '\n');} static void task_cpus_allowed(struct seq_file *m, struct task_struct *task){	seq_printf(m, "Cpus_allowed:\t%*pb\n",		   cpumask_pr_args(task->cpus_ptr));	seq_printf(m, "Cpus_allowed_list:\t%*pbl\n",		   cpumask_pr_args(task->cpus_ptr));} static inline void task_core_dumping(struct seq_file *m, struct mm_struct *mm){	seq_put_decimal_ull(m, "CoreDumping:\t", !!mm->core_state);	seq_putc(m, '\n');} static inline void task_thp_status(struct seq_file *m, struct mm_struct *mm){	bool thp_enabled = IS_ENABLED(CONFIG_TRANSPARENT_HUGEPAGE); 	if (thp_enabled)		thp_enabled = !test_bit(MMF_DISABLE_THP, &mm->flags);	seq_printf(m, "THP_enabled:\t%d\n", thp_enabled);} 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); 	seq_puts(m, "Name:\t");	proc_task_name(m, task, true);	seq_putc(m, '\n'); 	task_state(m, ns, pid, task); 	if (mm) {		task_mem(m, mm);		task_core_dumping(m, mm);		task_thp_status(m, mm);		mmput(mm);	}	task_sig(m, task);	task_cap(m, task);	task_seccomp(m, task);	task_cpus_allowed(m, task);	cpuset_task_status_allowed(m, task);	task_context_switch_counts(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 = 0;	int 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;	u64 cutime, cstime, utime, stime;	u64 cgtime, gtime;	unsigned long rsslim = 0;	unsigned long flags; 	state = *get_task_state(task);	vsize = eip = esp = 0;	permitted = ptrace_may_access(task, PTRACE_MODE_READ_FSCREDS | PTRACE_MODE_NOAUDIT);	mm = get_task_mm(task);	if (mm) {		vsize = task_vsize(mm);		/*		 * esp and eip are intentionally zeroed out.  There is no		 * non-racy way to read them without freezing the task.		 * Programs that need reliable values can use ptrace(2).		 *		 * The only exception is if the task is core dumping because		 * a program is not able to use ptrace(2) in that case. It is		 * safe because the task has stopped executing permanently.		 */		if (permitted && (task->flags & (PF_EXITING|PF_DUMPCORE))) {			if (try_get_task_stack(task)) {				eip = KSTK_EIP(task);				esp = KSTK_ESP(task);				put_task_stack(task);			}		}	} 	sigemptyset(&sigign);	sigemptyset(&sigcatch);	cutime = cstime = utime = stime = 0;	cgtime = gtime = 0; 	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 = get_nr_threads(task);		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 = READ_ONCE(sig->rlim[RLIMIT_RSS].rlim_cur); 		/* add up live thread stats at the group level */		if (whole) {			struct task_struct *t = task;

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