mirrors/linux-stable
1
0
Fork 0
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git synced 2024-08-20 14:16:02 +00:00
Code Issues Releases Wiki Activity
linux-stable/fs/proc/array.c
Rick Edgecombe 0ee44885fe x86: Expose thread features in /proc/$PID/status 
Applications and loaders can have logic to decide whether to enable
shadow stack. They usually don't report whether shadow stack has been
enabled or not, so there is no way to verify whether an application
actually is protected by shadow stack.

Add two lines in /proc/$PID/status to report enabled and locked features.

Since, this involves referring to arch specific defines in asm/prctl.h,
implement an arch breakout to emit the feature lines.

[Switched to CET, added to commit log]

Co-developed-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Signed-off-by: Rick Edgecombe <rick.p.edgecombe@intel.com>
Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com>
Reviewed-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Kees Cook <keescook@chromium.org>
Acked-by: Mike Rapoport (IBM) <rppt@kernel.org>
Tested-by: Pengfei Xu <pengfei.xu@intel.com>
Tested-by: John Allen <john.allen@amd.com>
Tested-by: Kees Cook <keescook@chromium.org>
Link: https://lore.kernel.org/all/20230613001108.3040476-37-rick.p.edgecombe%40intel.com
2023-08-02 15:01:51 -07:00

813 lines
22 KiB
C
Raw Blame History

// 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/time_namespace.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/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/string_helpers.h>
#include <linux/user_namespace.h>
#include <linux/fs_struct.h>
#include <linux/kthread.h>
#include <linux/mmu_context.h>
#include <asm/processor.h>
#include "internal.h"
void proc_task_name(struct seq_file *m, struct task_struct *p, bool escape)
{
char tcomm[64];
/*
* Test before PF_KTHREAD because all workqueue worker threads are
* kernel threads.
*/
if (p->flags & PF_WQ_WORKER)
wq_worker_comm(tcomm, sizeof(tcomm), p);
else if (p->flags & PF_KTHREAD)
get_kthread_comm(tcomm, sizeof(tcomm), p);
else
__get_task_comm(tcomm, sizeof(tcomm), p);
if (escape)
seq_escape_str(m, tcomm, ESCAPE_SPACE | ESCAPE_SPECIAL, "\n\\");
else
seq_printf(m, "%.64s", tcomm);
}
/*
* 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');
seq_printf(m, "Kthread:\t%c\n", p->flags & PF_KTHREAD ? '1' : '0');
}
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 = get_rlimit_value(task_ucounts(p), UCOUNT_RLIMIT_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)
{
seq_puts(m, header);
seq_put_hex_ll(m, NULL, a->val, 16);
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);
#ifdef CONFIG_SECCOMP_FILTER
seq_put_decimal_ull(m, "\nSeccomp_filters:\t",
atomic_read(&p->seccomp.filter_count));
#endif
#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_puts(m, "\nSpeculationIndirectBranch:\t");
switch (arch_prctl_spec_ctrl_get(p, PR_SPEC_INDIRECT_BRANCH)) {
case -EINVAL:
seq_puts(m, "unsupported");
break;
case PR_SPEC_NOT_AFFECTED:
seq_puts(m, "not affected");
break;
case PR_SPEC_PRCTL | PR_SPEC_FORCE_DISABLE:
seq_puts(m, "conditional force disabled");
break;
case PR_SPEC_PRCTL | PR_SPEC_DISABLE:
seq_puts(m, "conditional disabled");
break;
case PR_SPEC_PRCTL | PR_SPEC_ENABLE:
seq_puts(m, "conditional enabled");
break;
case PR_SPEC_ENABLE:
seq_puts(m, "always enabled");
break;
case PR_SPEC_DISABLE:
seq_puts(m, "always disabled");
break;
default:
seq_puts(m, "unknown");
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_mask));
seq_printf(m, "Cpus_allowed_list:\t%*pbl\n",
cpumask_pr_args(&task->cpus_mask));
}
static inline void task_core_dumping(struct seq_file *m, struct task_struct *task)
{
seq_put_decimal_ull(m, "CoreDumping:\t", !!task->signal->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);
}
static inline void task_untag_mask(struct seq_file *m, struct mm_struct *mm)
{
seq_printf(m, "untag_mask:\t%#lx\n", mm_untag_mask(mm));
}
__weak void arch_proc_pid_thread_features(struct seq_file *m,
struct task_struct *task)
{
}
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, task);
task_thp_status(m, mm);
task_untag_mask(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);
arch_proc_pid_thread_features(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;
int exit_code = task->exit_code;
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;
do {
min_flt += t->min_flt;
maj_flt += t->maj_flt;
gtime += task_gtime(t);
} while_each_thread(task, t);
min_flt += sig->min_flt;
maj_flt += sig->maj_flt;
thread_group_cputime_adjusted(task, &utime, &stime);
gtime += sig->gtime;
if (sig->flags & (SIGNAL_GROUP_EXIT | SIGNAL_STOP_STOPPED))
exit_code = sig->group_exit_code;
}
sid = task_session_nr_ns(task, ns);
ppid = task_tgid_nr_ns(task->real_parent, ns);
pgid = task_pgrp_nr_ns(task, ns);
unlock_task_sighand(task, &flags);
}
if (permitted && (!whole || num_threads < 2))
wchan = !task_is_running(task);
if (!whole) {
min_flt = task->min_flt;
maj_flt = task->maj_flt;
task_cputime_adjusted(task, &utime, &stime);
gtime = task_gtime(task);
}
/* scale priority and nice values from timeslices to -20..20 */
/* to make it look like a "normal" Unix priority/nice value */
priority = task_prio(task);
nice = task_nice(task);
/* apply timens offset for boottime and convert nsec -> ticks */
start_time =
nsec_to_clock_t(timens_add_boottime_ns(task->start_boottime));
seq_put_decimal_ull(m, "", pid_nr_ns(pid, ns));
seq_puts(m, " (");
proc_task_name(m, task, false);
seq_puts(m, ") ");
seq_putc(m, state);
seq_put_decimal_ll(m, " ", ppid);
seq_put_decimal_ll(m, " ", pgid);
seq_put_decimal_ll(m, " ", sid);
seq_put_decimal_ll(m, " ", tty_nr);
seq_put_decimal_ll(m, " ", tty_pgrp);
seq_put_decimal_ull(m, " ", task->flags);
seq_put_decimal_ull(m, " ", min_flt);
seq_put_decimal_ull(m, " ", cmin_flt);
seq_put_decimal_ull(m, " ", maj_flt);
seq_put_decimal_ull(m, " ", cmaj_flt);
seq_put_decimal_ull(m, " ", nsec_to_clock_t(utime));
seq_put_decimal_ull(m, " ", nsec_to_clock_t(stime));
seq_put_decimal_ll(m, " ", nsec_to_clock_t(cutime));
seq_put_decimal_ll(m, " ", nsec_to_clock_t(cstime));
seq_put_decimal_ll(m, " ", priority);
seq_put_decimal_ll(m, " ", nice);
seq_put_decimal_ll(m, " ", num_threads);
seq_put_decimal_ull(m, " ", 0);
seq_put_decimal_ull(m, " ", start_time);
seq_put_decimal_ull(m, " ", vsize);
seq_put_decimal_ull(m, " ", mm ? get_mm_rss(mm) : 0);
seq_put_decimal_ull(m, " ", rsslim);
seq_put_decimal_ull(m, " ", mm ? (permitted ? mm->start_code : 1) : 0);
seq_put_decimal_ull(m, " ", mm ? (permitted ? mm->end_code : 1) : 0);
seq_put_decimal_ull(m, " ", (permitted && mm) ? mm->start_stack : 0);
seq_put_decimal_ull(m, " ", esp);
seq_put_decimal_ull(m, " ", eip);
/* The signal information here is obsolete.
* It must be decimal for Linux 2.0 compatibility.
* Use /proc/#/status for real-time signals.
*/
seq_put_decimal_ull(m, " ", task->pending.signal.sig[0] & 0x7fffffffUL);
seq_put_decimal_ull(m, " ", task->blocked.sig[0] & 0x7fffffffUL);
seq_put_decimal_ull(m, " ", sigign.sig[0] & 0x7fffffffUL);
seq_put_decimal_ull(m, " ", sigcatch.sig[0] & 0x7fffffffUL);
/*
* We used to output the absolute kernel address, but that's an
* information leak - so instead we show a 0/1 flag here, to signal
* to user-space whether there's a wchan field in /proc/PID/wchan.
*
* This works with older implementations of procps as well.
*/
seq_put_decimal_ull(m, " ", wchan);
seq_put_decimal_ull(m, " ", 0);
seq_put_decimal_ull(m, " ", 0);
seq_put_decimal_ll(m, " ", task->exit_signal);
seq_put_decimal_ll(m, " ", task_cpu(task));
seq_put_decimal_ull(m, " ", task->rt_priority);
seq_put_decimal_ull(m, " ", task->policy);
seq_put_decimal_ull(m, " ", delayacct_blkio_ticks(task));
seq_put_decimal_ull(m, " ", nsec_to_clock_t(gtime));
seq_put_decimal_ll(m, " ", nsec_to_clock_t(cgtime));
if (mm && permitted) {
seq_put_decimal_ull(m, " ", mm->start_data);
seq_put_decimal_ull(m, " ", mm->end_data);
seq_put_decimal_ull(m, " ", mm->start_brk);
seq_put_decimal_ull(m, " ", mm->arg_start);
seq_put_decimal_ull(m, " ", mm->arg_end);
seq_put_decimal_ull(m, " ", mm->env_start);
seq_put_decimal_ull(m, " ", mm->env_end);
} else
seq_puts(m, " 0 0 0 0 0 0 0");
if (permitted)
seq_put_decimal_ll(m, " ", exit_code);
else
seq_puts(m, " 0");
seq_putc(m, '\n');
if (mm)
mmput(mm);
return 0;
}
int proc_tid_stat(struct seq_file *m, struct pid_namespace *ns,
struct pid *pid, struct task_struct *task)
{
return do_task_stat(m, ns, pid, task, 0);
}
int proc_tgid_stat(struct seq_file *m, struct pid_namespace *ns,
struct pid *pid, struct task_struct *task)
{
return do_task_stat(m, ns, pid, task, 1);
}
int proc_pid_statm(struct seq_file *m, struct pid_namespace *ns,
struct pid *pid, struct task_struct *task)
{
struct mm_struct *mm = get_task_mm(task);
if (mm) {
unsigned long size;
unsigned long resident = 0;
unsigned long shared = 0;
unsigned long text = 0;
unsigned long data = 0;
size = task_statm(mm, &shared, &text, &data, &resident);
mmput(mm);
/*
* For quick read, open code by putting numbers directly
* expected format is
* seq_printf(m, "%lu %lu %lu %lu 0 %lu 0\n",
* size, resident, shared, text, data);
*/
seq_put_decimal_ull(m, "", size);
seq_put_decimal_ull(m, " ", resident);
seq_put_decimal_ull(m, " ", shared);
seq_put_decimal_ull(m, " ", text);
seq_put_decimal_ull(m, " ", 0);
seq_put_decimal_ull(m, " ", data);
seq_put_decimal_ull(m, " ", 0);
seq_putc(m, '\n');
} else {
seq_write(m, "0 0 0 0 0 0 0\n", 14);
}
return 0;
}
#ifdef CONFIG_PROC_CHILDREN
static struct pid *
get_children_pid(struct inode *inode, struct pid *pid_prev, loff_t pos)
{
struct task_struct *start, *task;
struct pid *pid = NULL;
read_lock(&tasklist_lock);
start = pid_task(proc_pid(inode), PIDTYPE_PID);
if (!start)
goto out;
/*
* Lets try to continue searching first, this gives
* us significant speedup on children-rich processes.
*/
if (pid_prev) {
task = pid_task(pid_prev, PIDTYPE_PID);
if (task && task->real_parent == start &&
!(list_empty(&task->sibling))) {
if (list_is_last(&task->sibling, &start->children))
goto out;
task = list_first_entry(&task->sibling,
struct task_struct, sibling);
pid = get_pid(task_pid(task));
goto out;
}
}
/*
* Slow search case.
*
* We might miss some children here if children
* are exited while we were not holding the lock,
* but it was never promised to be accurate that
* much.
*
* "Just suppose that the parent sleeps, but N children
* exit after we printed their tids. Now the slow paths
* skips N extra children, we miss N tasks." (c)
*
* So one need to stop or freeze the leader and all
* its children to get a precise result.
*/
list_for_each_entry(task, &start->children, sibling) {
if (pos-- == 0) {
pid = get_pid(task_pid(task));
break;
}
}
out:
read_unlock(&tasklist_lock);
return pid;
}
static int children_seq_show(struct seq_file *seq, void *v)
{
struct inode *inode = file_inode(seq->file);
seq_printf(seq, "%d ", pid_nr_ns(v, proc_pid_ns(inode->i_sb)));
return 0;
}
static void *children_seq_start(struct seq_file *seq, loff_t *pos)
{
return get_children_pid(file_inode(seq->file), NULL, *pos);
}
static void *children_seq_next(struct seq_file *seq, void *v, loff_t *pos)
{
struct pid *pid;
pid = get_children_pid(file_inode(seq->file), v, *pos + 1);
put_pid(v);
++*pos;
return pid;
}
static void children_seq_stop(struct seq_file *seq, void *v)
{
put_pid(v);
}
static const struct seq_operations children_seq_ops = {
.start = children_seq_start,
.next = children_seq_next,
.stop = children_seq_stop,
.show = children_seq_show,
};
static int children_seq_open(struct inode *inode, struct file *file)
{
return seq_open(file, &children_seq_ops);
}
const struct file_operations proc_tid_children_operations = {
.open = children_seq_open,
.read = seq_read,
.llseek = seq_lseek,
.release = seq_release,
};
#endif /* CONFIG_PROC_CHILDREN */
Reference in a new issue View git blame Copy permalink