[tip:core/urgent 1/1] fs/proc/array.c:430:10: note: in expansion of macro 'KSTK_EIP'

From: kbuild test robot
Date: Fri Sep 15 2017 - 17:20:09 EST

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tree: https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git core/urgent
head: 451eb3f2053ea4eeb40f94947c542cfbd7636186
commit: 451eb3f2053ea4eeb40f94947c542cfbd7636186 [1/1] fs/proc: Report eip/esp in /prod/PID/stat for coredumping
config: i386-randconfig-x003-201737 (attached as .config)
compiler: gcc-6 (Debian 6.2.0-3) 6.2.0 20160901
reproduce:
git checkout 451eb3f2053ea4eeb40f94947c542cfbd7636186
# save the attached .config to linux build tree
make ARCH=i386

All error/warnings (new ones prefixed by >>):

In file included from arch/x86/include/asm/cpufeature.h:4:0,
from arch/x86/include/asm/thread_info.h:52,
from include/linux/thread_info.h:37,
from arch/x86/include/asm/preempt.h:6,
from include/linux/preempt.h:80,
from include/linux/spinlock.h:50,
from include/linux/seqlock.h:35,
from include/linux/time.h:5,
from fs/proc/array.c:57:
fs/proc/array.c: In function 'do_task_stat':
>> arch/x86/include/asm/processor.h:839:39: error: implicit declaration of function 'task_stack_page' [-Werror=implicit-function-declaration]
unsigned long __ptr = (unsigned long)task_stack_page(task); \
^
>> arch/x86/include/asm/processor.h:896:26: note: in expansion of macro 'task_pt_regs'
#define KSTK_EIP(task) (task_pt_regs(task)->ip)
^~~~~~~~~~~~
>> fs/proc/array.c:430:10: note: in expansion of macro 'KSTK_EIP'
eip = KSTK_EIP(task);
^~~~~~~~
cc1: some warnings being treated as errors
--
In file included from arch/x86/include/asm/cpufeature.h:4:0,
from arch/x86/include/asm/thread_info.h:52,
from include/linux/thread_info.h:37,
from arch/x86/include/asm/preempt.h:6,
from include/linux/preempt.h:80,
from include/linux/spinlock.h:50,
from include/linux/seqlock.h:35,
from include/linux/time.h:5,
from fs//proc/array.c:57:
fs//proc/array.c: In function 'do_task_stat':
>> arch/x86/include/asm/processor.h:839:39: error: implicit declaration of function 'task_stack_page' [-Werror=implicit-function-declaration]
unsigned long __ptr = (unsigned long)task_stack_page(task); \
^
>> arch/x86/include/asm/processor.h:896:26: note: in expansion of macro 'task_pt_regs'
#define KSTK_EIP(task) (task_pt_regs(task)->ip)
^~~~~~~~~~~~
fs//proc/array.c:430:10: note: in expansion of macro 'KSTK_EIP'
eip = KSTK_EIP(task);
^~~~~~~~
cc1: some warnings being treated as errors

vim +/KSTK_EIP +430 fs/proc/array.c

392
393 static int do_task_stat(struct seq_file *m, struct pid_namespace *ns,
394 struct pid *pid, struct task_struct *task, int whole)
395 {
396 unsigned long vsize, eip, esp, wchan = 0;
397 int priority, nice;
398 int tty_pgrp = -1, tty_nr = 0;
399 sigset_t sigign, sigcatch;
400 char state;
401 pid_t ppid = 0, pgid = -1, sid = -1;
402 int num_threads = 0;
403 int permitted;
404 struct mm_struct *mm;
405 unsigned long long start_time;
406 unsigned long cmin_flt = 0, cmaj_flt = 0;
407 unsigned long min_flt = 0, maj_flt = 0;
408 u64 cutime, cstime, utime, stime;
409 u64 cgtime, gtime;
410 unsigned long rsslim = 0;
411 char tcomm[sizeof(task->comm)];
412 unsigned long flags;
413
414 state = *get_task_state(task);
415 vsize = eip = esp = 0;
416 permitted = ptrace_may_access(task, PTRACE_MODE_READ_FSCREDS | PTRACE_MODE_NOAUDIT);
417 mm = get_task_mm(task);
418 if (mm) {
419 vsize = task_vsize(mm);
420 /*
421 * esp and eip are intentionally zeroed out. There is no
422 * non-racy way to read them without freezing the task.
423 * Programs that need reliable values can use ptrace(2).
424 *
425 * The only exception is if the task is core dumping because
426 * a program is not able to use ptrace(2) in that case. It is
427 * safe because the task has stopped executing permanently.
428 */
429 if (permitted && (task->flags & PF_DUMPCORE)) {
> 430 eip = KSTK_EIP(task);
431 esp = KSTK_ESP(task);
432 }
433 }
434
435 get_task_comm(tcomm, task);
436
437 sigemptyset(&sigign);
438 sigemptyset(&sigcatch);
439 cutime = cstime = utime = stime = 0;
440 cgtime = gtime = 0;
441
442 if (lock_task_sighand(task, &flags)) {
443 struct signal_struct *sig = task->signal;
444
445 if (sig->tty) {
446 struct pid *pgrp = tty_get_pgrp(sig->tty);
447 tty_pgrp = pid_nr_ns(pgrp, ns);
448 put_pid(pgrp);
449 tty_nr = new_encode_dev(tty_devnum(sig->tty));
450 }
451
452 num_threads = get_nr_threads(task);
453 collect_sigign_sigcatch(task, &sigign, &sigcatch);
454
455 cmin_flt = sig->cmin_flt;
456 cmaj_flt = sig->cmaj_flt;
457 cutime = sig->cutime;
458 cstime = sig->cstime;
459 cgtime = sig->cgtime;
460 rsslim = ACCESS_ONCE(sig->rlim[RLIMIT_RSS].rlim_cur);
461
462 /* add up live thread stats at the group level */
463 if (whole) {
464 struct task_struct *t = task;
465 do {
466 min_flt += t->min_flt;
467 maj_flt += t->maj_flt;
468 gtime += task_gtime(t);
469 } while_each_thread(task, t);
470
471 min_flt += sig->min_flt;
472 maj_flt += sig->maj_flt;
473 thread_group_cputime_adjusted(task, &utime, &stime);
474 gtime += sig->gtime;
475 }
476
477 sid = task_session_nr_ns(task, ns);
478 ppid = task_tgid_nr_ns(task->real_parent, ns);
479 pgid = task_pgrp_nr_ns(task, ns);
480
481 unlock_task_sighand(task, &flags);
482 }
483
484 if (permitted && (!whole || num_threads < 2))
485 wchan = get_wchan(task);
486 if (!whole) {
487 min_flt = task->min_flt;
488 maj_flt = task->maj_flt;
489 task_cputime_adjusted(task, &utime, &stime);
490 gtime = task_gtime(task);
491 }
492
493 /* scale priority and nice values from timeslices to -20..20 */
494 /* to make it look like a "normal" Unix priority/nice value */
495 priority = task_prio(task);
496 nice = task_nice(task);
497
498 /* convert nsec -> ticks */
499 start_time = nsec_to_clock_t(task->real_start_time);
500
501 seq_printf(m, "%d (%s) %c", pid_nr_ns(pid, ns), tcomm, state);
502 seq_put_decimal_ll(m, " ", ppid);
503 seq_put_decimal_ll(m, " ", pgid);
504 seq_put_decimal_ll(m, " ", sid);
505 seq_put_decimal_ll(m, " ", tty_nr);
506 seq_put_decimal_ll(m, " ", tty_pgrp);
507 seq_put_decimal_ull(m, " ", task->flags);
508 seq_put_decimal_ull(m, " ", min_flt);
509 seq_put_decimal_ull(m, " ", cmin_flt);
510 seq_put_decimal_ull(m, " ", maj_flt);
511 seq_put_decimal_ull(m, " ", cmaj_flt);
512 seq_put_decimal_ull(m, " ", nsec_to_clock_t(utime));
513 seq_put_decimal_ull(m, " ", nsec_to_clock_t(stime));
514 seq_put_decimal_ll(m, " ", nsec_to_clock_t(cutime));
515 seq_put_decimal_ll(m, " ", nsec_to_clock_t(cstime));
516 seq_put_decimal_ll(m, " ", priority);
517 seq_put_decimal_ll(m, " ", nice);
518 seq_put_decimal_ll(m, " ", num_threads);
519 seq_put_decimal_ull(m, " ", 0);
520 seq_put_decimal_ull(m, " ", start_time);
521 seq_put_decimal_ull(m, " ", vsize);
522 seq_put_decimal_ull(m, " ", mm ? get_mm_rss(mm) : 0);
523 seq_put_decimal_ull(m, " ", rsslim);
524 seq_put_decimal_ull(m, " ", mm ? (permitted ? mm->start_code : 1) : 0);
525 seq_put_decimal_ull(m, " ", mm ? (permitted ? mm->end_code : 1) : 0);
526 seq_put_decimal_ull(m, " ", (permitted && mm) ? mm->start_stack : 0);
527 seq_put_decimal_ull(m, " ", esp);
528 seq_put_decimal_ull(m, " ", eip);
529 /* The signal information here is obsolete.
530 * It must be decimal for Linux 2.0 compatibility.
531 * Use /proc/#/status for real-time signals.
532 */
533 seq_put_decimal_ull(m, " ", task->pending.signal.sig[0] & 0x7fffffffUL);
534 seq_put_decimal_ull(m, " ", task->blocked.sig[0] & 0x7fffffffUL);
535 seq_put_decimal_ull(m, " ", sigign.sig[0] & 0x7fffffffUL);
536 seq_put_decimal_ull(m, " ", sigcatch.sig[0] & 0x7fffffffUL);
537
538 /*
539 * We used to output the absolute kernel address, but that's an
540 * information leak - so instead we show a 0/1 flag here, to signal
541 * to user-space whether there's a wchan field in /proc/PID/wchan.
542 *
543 * This works with older implementations of procps as well.
544 */
545 if (wchan)
546 seq_puts(m, " 1");
547 else
548 seq_puts(m, " 0");
549
550 seq_put_decimal_ull(m, " ", 0);
551 seq_put_decimal_ull(m, " ", 0);
552 seq_put_decimal_ll(m, " ", task->exit_signal);
553 seq_put_decimal_ll(m, " ", task_cpu(task));
554 seq_put_decimal_ull(m, " ", task->rt_priority);
555 seq_put_decimal_ull(m, " ", task->policy);
556 seq_put_decimal_ull(m, " ", delayacct_blkio_ticks(task));
557 seq_put_decimal_ull(m, " ", nsec_to_clock_t(gtime));
558 seq_put_decimal_ll(m, " ", nsec_to_clock_t(cgtime));
559
560 if (mm && permitted) {
561 seq_put_decimal_ull(m, " ", mm->start_data);
562 seq_put_decimal_ull(m, " ", mm->end_data);
563 seq_put_decimal_ull(m, " ", mm->start_brk);
564 seq_put_decimal_ull(m, " ", mm->arg_start);
565 seq_put_decimal_ull(m, " ", mm->arg_end);
566 seq_put_decimal_ull(m, " ", mm->env_start);
567 seq_put_decimal_ull(m, " ", mm->env_end);
568 } else
569 seq_puts(m, " 0 0 0 0 0 0 0");
570
571 if (permitted)
572 seq_put_decimal_ll(m, " ", task->exit_code);
573 else
574 seq_puts(m, " 0");
575
576 seq_putc(m, '\n');
577 if (mm)
578 mmput(mm);
579 return 0;
580 }
581

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Next message: Pavel Tatashin: "Re: [PATCH v8 10/11] arm64/kasan: explicitly zero kasan shadow memory"
Previous message: tip-bot for John Ogness: "[tip:core/urgent] fs/proc: Report eip/esp in /prod/PID/stat for coredumping"
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