Learn how easy it is to sync an existing GitHub or Google Code repo to a SourceForge project! See Demo

Close

[6ee980]: opjitconv / opjitconv.c Maximize Restore History

Download this file

opjitconv.c    855 lines (780 with data), 24.6 kB

  1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
/**
* @file opjitconv.c
* Convert a jit dump file to an ELF file
*
* @remark Copyright 2007 OProfile authors
* @remark Read the file COPYING
*
* @author Jens Wilke
* @Modifications Maynard Johnson
* @Modifications Daniel Hansel
* @Modifications Gisle Dankel
*
* Copyright IBM Corporation 2007
*
*/
#include "opjitconv.h"
#include "opd_printf.h"
#include "op_file.h"
#include "op_libiberty.h"
#include <dirent.h>
#include <fnmatch.h>
#include <errno.h>
#include <fcntl.h>
#include <limits.h>
#include <assert.h>
#include <pwd.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/mman.h>
#include <sys/types.h>
#include <unistd.h>
#include <wait.h>
/*
* list head. The linked list is used during parsing (parse_all) to
* hold all jitentry elements. After parsing, the program works on the
* array structures (entries_symbols_ascending, entries_address_ascending)
* and the linked list is not used any more.
*/
struct jitentry * jitentry_list = NULL;
struct jitentry_debug_line * jitentry_debug_line_list = NULL;
/* Global variable for asymbols so we can free the storage later. */
asymbol ** syms;
/* jit dump header information */
enum bfd_architecture dump_bfd_arch;
int dump_bfd_mach;
char const * dump_bfd_target_name;
/* user information for special user 'oprofile' */
struct passwd * pw_oprofile;
char sys_cmd_buffer[PATH_MAX + 1];
/* the bfd handle of the ELF file we write */
bfd * cur_bfd;
/* count of jitentries in the list */
u32 entry_count;
/* maximul space in the entry arrays, needed to add entries */
u32 max_entry_count;
/* array pointing to all jit entries, sorted by symbol names */
struct jitentry ** entries_symbols_ascending;
/* array pointing to all jit entries sorted by address */
struct jitentry ** entries_address_ascending;
/* debug flag, print some information */
int debug;
/* indicates opjitconv invoked by non-root user via operf */
int non_root;
/* indicates we should delete jitdump files owned by the user */
int delete_jitdumps;
LIST_HEAD(jitdump_deletion_candidates);
/*
* Front-end processing from this point to end of the source.
* From main(), the general flow is as follows:
* 1. Find all anonymous samples directories
* 2. Find all JIT dump files
* 3. For each JIT dump file:
* 3.1 Find matching anon samples dir (from list retrieved in step 1)
* 3.2 mmap the JIT dump file
* 3.3 Call op_jit_convert to create ELF file if necessary
*/
/* Callback function used for get_matching_pathnames() call to obtain
* matching path names.
*/
static void get_pathname(char const * pathname, void * name_list)
{
struct list_head * names = (struct list_head *) name_list;
struct pathname * pn = xmalloc(sizeof(struct pathname));
pn->name = xstrdup(pathname);
list_add(&pn->neighbor, names);
}
static void delete_pathname(struct pathname * pname)
{
free(pname->name);
list_del(&pname->neighbor);
free(pname);
}
static void delete_path_names_list(struct list_head * list)
{
struct list_head * pos1, * pos2;
list_for_each_safe(pos1, pos2, list) {
struct pathname * pname = list_entry(pos1, struct pathname,
neighbor);
delete_pathname(pname);
}
}
static int mmap_jitdump(char const * dumpfile,
struct op_jitdump_info * file_info)
{
int rc = OP_JIT_CONV_OK;
int dumpfd;
dumpfd = open(dumpfile, O_RDONLY);
if (dumpfd < 0) {
if (errno == ENOENT)
rc = OP_JIT_CONV_NO_DUMPFILE;
else
rc = OP_JIT_CONV_FAIL;
goto out;
}
rc = fstat(dumpfd, &file_info->dmp_file_stat);
if (rc < 0) {
perror("opjitconv:fstat on dumpfile");
rc = OP_JIT_CONV_FAIL;
goto out;
}
file_info->dmp_file = mmap(0, file_info->dmp_file_stat.st_size,
PROT_READ, MAP_PRIVATE, dumpfd, 0);
if (file_info->dmp_file == MAP_FAILED) {
perror("opjitconv:mmap\n");
rc = OP_JIT_CONV_FAIL;
}
out:
if (dumpfd != -1)
close(dumpfd);
return rc;
}
static char const * find_anon_dir_match(struct list_head * anon_dirs,
char const * proc_id)
{
struct list_head * pos;
/* Current PID_MAX_LIMIT (as defined in include/linux/threads.h) is
* 4 x 4 x 1024 * 1024 (for 64-bit kernels)
* So need to have space for 7 chars for proc_id.
*/
char match_filter[12];
snprintf(match_filter, 12, "*/%s.*", proc_id);
list_for_each(pos, anon_dirs) {
struct pathname * anon_dir =
list_entry(pos, struct pathname, neighbor);
if (!fnmatch(match_filter, anon_dir->name, 0))
return anon_dir->name;
}
return NULL;
}
int change_owner(char * path)
{
int rc = OP_JIT_CONV_OK;
int fd;
if (non_root)
return rc;
fd = open(path, 0);
if (fd < 0) {
printf("opjitconv: File cannot be opened for changing ownership.\n");
rc = OP_JIT_CONV_FAIL;
goto out;
}
if (fchown(fd, pw_oprofile->pw_uid, pw_oprofile->pw_gid) != 0) {
printf("opjitconv: Changing ownership failed (%s).\n", strerror(errno));
close(fd);
rc = OP_JIT_CONV_FAIL;
goto out;
}
close(fd);
out:
return rc;
}
/* Copies the given file to the temporary working directory and sets ownership
* to 'oprofile:oprofile'.
*/
int copy_dumpfile(char const * dumpfile, char * tmp_dumpfile)
{
int rc = OP_JIT_CONV_OK;
sprintf(sys_cmd_buffer, "/bin/cp -p %s %s", dumpfile, tmp_dumpfile);
if (system(sys_cmd_buffer) != 0) {
printf("opjitconv: Calling system() to copy files failed.\n");
rc = OP_JIT_CONV_FAIL;
goto out;
}
if (change_owner(tmp_dumpfile) != 0) {
printf("opjitconv: Changing ownership of temporary dump file failed.\n");
rc = OP_JIT_CONV_FAIL;
goto out;
}
out:
return rc;
}
/* Copies the created ELF file located in the temporary working directory to the
* final destination (i.e. given ELF file name) and sets ownership to the
* current user.
*/
int copy_elffile(char * elf_file, char * tmp_elffile)
{
int rc = OP_JIT_CONV_OK;
int fd;
sprintf(sys_cmd_buffer, "/bin/cp -p %s %s", tmp_elffile, elf_file);
if (system(sys_cmd_buffer) != 0) {
printf("opjitconv: Calling system() to copy files failed.\n");
rc = OP_JIT_CONV_FAIL;
goto out;
}
fd = open(elf_file, 0);
if (fd < 0) {
printf("opjitconv: File cannot be opened for changing ownership.\n");
rc = OP_JIT_CONV_FAIL;
goto out;
}
if (fchown(fd, getuid(), getgid()) != 0) {
printf("opjitconv: Changing ownership failed (%s).\n", strerror(errno));
close(fd);
rc = OP_JIT_CONV_FAIL;
goto out;
}
close(fd);
out:
return rc;
}
/* Look for an anonymous samples directory that matches the process ID
* given by the passed JIT dmp_pathname. If none is found, it's an error
* since by agreement, all JIT dump files should be removed every time
* the user does --reset. If we do find the matching samples directory,
* we create an ELF file (<proc_id>.jo) and place it in that directory.
*/
static int process_jit_dumpfile(char const * dmp_pathname,
struct list_head * anon_sample_dirs,
unsigned long long start_time,
unsigned long long end_time,
char * tmp_conv_dir)
{
int result_dir_length, proc_id_length;
int rc = OP_JIT_CONV_OK;
int jofd;
struct stat file_stat;
time_t dumpfile_modtime;
struct op_jitdump_info dmp_info;
char * elf_file = NULL;
char * proc_id = NULL;
char const * anon_dir;
char const * dumpfilename = rindex(dmp_pathname, '/');
/* temporary copy of dump file created for conversion step */
char * tmp_dumpfile;
/* temporary ELF file created during conversion step */
char * tmp_elffile;
verbprintf(debug, "Processing dumpfile %s\n", dmp_pathname);
/* Check if the dump file is a symbolic link.
* We should not trust symbolic links because we only produce normal dump
* files (no links).
*/
if (lstat(dmp_pathname, &file_stat) == -1) {
printf("opjitconv: lstat for dumpfile failed (%s).\n", strerror(errno));
rc = OP_JIT_CONV_FAIL;
goto out;
}
if (S_ISLNK(file_stat.st_mode)) {
printf("opjitconv: dumpfile path is corrupt (symbolic links not allowed).\n");
rc = OP_JIT_CONV_FAIL;
goto out;
}
if (dumpfilename) {
size_t tmp_conv_dir_length = strlen(tmp_conv_dir);
char const * dot_dump = rindex(++dumpfilename, '.');
if (!dot_dump)
goto chk_proc_id;
proc_id_length = dot_dump - dumpfilename;
proc_id = xmalloc(proc_id_length + 1);
memcpy(proc_id, dumpfilename, proc_id_length);
proc_id[proc_id_length] = '\0';
verbprintf(debug, "Found JIT dumpfile for process %s\n",
proc_id);
tmp_dumpfile = xmalloc(tmp_conv_dir_length + 1 + strlen(dumpfilename) + 1);
strncpy(tmp_dumpfile, tmp_conv_dir, tmp_conv_dir_length);
tmp_dumpfile[tmp_conv_dir_length] = '\0';
strcat(tmp_dumpfile, "/");
strcat(tmp_dumpfile, dumpfilename);
}
chk_proc_id:
if (!proc_id) {
printf("opjitconv: dumpfile path is corrupt.\n");
rc = OP_JIT_CONV_FAIL;
goto out;
}
if (!(anon_dir = find_anon_dir_match(anon_sample_dirs, proc_id))) {
/* With the capability of profiling with operf (as well as with
* the legacy oprofile daemon), users will not be using opcontrol
* to remove all jitdump files; instead, opjitconv will remove old
* jitdump files (see _cleanup_jitdumps() for details). But this cleanup
* strategy makes it quite likely that opjitconv will sometimes find
* jitdump files that are not owned by the current user or are in use
* by other operf users, thus, the current profile data would not have
* matching anon samples for such jitdump files.
*/
verbprintf(debug, "Informational message: No matching anon samples for %s\n",
dmp_pathname);
rc = OP_JIT_CONV_NO_MATCHING_ANON_SAMPLES;
goto free_res1;
}
if (copy_dumpfile(dmp_pathname, tmp_dumpfile) != OP_JIT_CONV_OK)
goto free_res1;
if ((rc = mmap_jitdump(tmp_dumpfile, &dmp_info)) == OP_JIT_CONV_OK) {
char * anon_path_seg = rindex(anon_dir, '/');
if (!anon_path_seg) {
printf("opjitconv: Bad path for anon sample: %s\n",
anon_dir);
rc = OP_JIT_CONV_FAIL;
goto free_res2;
}
result_dir_length = ++anon_path_seg - anon_dir;
/* create final ELF file name */
elf_file = xmalloc(result_dir_length +
strlen(proc_id) + strlen(".jo") + 1);
strncpy(elf_file, anon_dir, result_dir_length);
elf_file[result_dir_length] = '\0';
strcat(elf_file, proc_id);
strcat(elf_file, ".jo");
/* create temporary ELF file name */
tmp_elffile = xmalloc(strlen(tmp_conv_dir) + 1 +
strlen(proc_id) + strlen(".jo") + 1);
strncpy(tmp_elffile, tmp_conv_dir, strlen(tmp_conv_dir));
tmp_elffile[strlen(tmp_conv_dir)] = '\0';
strcat(tmp_elffile, "/");
strcat(tmp_elffile, proc_id);
strcat(tmp_elffile, ".jo");
// Check if final ELF file exists already
jofd = open(elf_file, O_RDONLY);
if (jofd < 0)
goto create_elf;
rc = fstat(jofd, &file_stat);
close(jofd);
if (rc < 0) {
perror("opjitconv:fstat on .jo file");
rc = OP_JIT_CONV_FAIL;
goto free_res3;
}
if (dmp_info.dmp_file_stat.st_mtime >
dmp_info.dmp_file_stat.st_ctime)
dumpfile_modtime = dmp_info.dmp_file_stat.st_mtime;
else
dumpfile_modtime = dmp_info.dmp_file_stat.st_ctime;
/* Final ELF file already exists, so if dumpfile has not been
* modified since the ELF file's mod time, we don't need to
* do ELF creation again.
*/
if (!(file_stat.st_ctime < dumpfile_modtime ||
file_stat.st_mtime < dumpfile_modtime)) {
rc = OP_JIT_CONV_ALREADY_DONE;
goto free_res3;
}
create_elf:
verbprintf(debug, "Converting %s to %s\n", dmp_pathname,
elf_file);
/* Set eGID of the special user 'oprofile'. */
if (!non_root && setegid(pw_oprofile->pw_gid) != 0) {
perror("opjitconv: setegid to special user failed");
rc = OP_JIT_CONV_FAIL;
goto free_res3;
}
/* Set eUID of the special user 'oprofile'. */
if (!non_root && seteuid(pw_oprofile->pw_uid) != 0) {
perror("opjitconv: seteuid to special user failed");
rc = OP_JIT_CONV_FAIL;
goto free_res3;
}
/* Convert the dump file as the special user 'oprofile'. */
rc = op_jit_convert(dmp_info, tmp_elffile, start_time, end_time);
if (rc < 0)
goto free_res3;
/* Set eUID back to the original user. */
if (!non_root && seteuid(getuid()) != 0) {
perror("opjitconv: seteuid to original user failed");
rc = OP_JIT_CONV_FAIL;
goto free_res3;
}
/* Set eGID back to the original user. */
if (!non_root && setegid(getgid()) != 0) {
perror("opjitconv: setegid to original user failed");
rc = OP_JIT_CONV_FAIL;
goto free_res3;
}
rc = copy_elffile(elf_file, tmp_elffile);
free_res3:
free(elf_file);
free(tmp_elffile);
free_res2:
munmap(dmp_info.dmp_file, dmp_info.dmp_file_stat.st_size);
}
free_res1:
free(proc_id);
free(tmp_dumpfile);
out:
return rc;
}
/* If non-NULL value is returned, caller is responsible for freeing memory.*/
static char * get_procid_from_dirname(char * dirname)
{
char * ret = NULL;
if (dirname) {
char * proc_id;
int proc_id_length;
char * fname = rindex(dirname, '/');
char const * dot = index(++fname, '.');
if (!dot)
goto out;
proc_id_length = dot - fname;
proc_id = xmalloc(proc_id_length + 1);
memcpy(proc_id, fname, proc_id_length);
proc_id[proc_id_length] = '\0';
ret = proc_id;
}
out:
return ret;
}
static void filter_anon_samples_list(struct list_head * anon_dirs)
{
struct procid {
struct procid * next;
char * pid;
};
struct procid * pid_list = NULL;
struct procid * id, * nxt;
struct list_head * pos1, * pos2;
list_for_each_safe(pos1, pos2, anon_dirs) {
struct pathname * pname = list_entry(pos1, struct pathname,
neighbor);
char * proc_id = get_procid_from_dirname(pname->name);
if (proc_id) {
int found = 0;
for (id = pid_list; id != NULL; id = id->next) {
if (!strcmp(id->pid, proc_id)) {
/* Already have an entry for this
* process ID, so delete this entry
* from anon_dirs.
*/
free(pname->name);
list_del(&pname->neighbor);
free(pname);
found = 1;
}
}
if (!found) {
struct procid * this_proc =
xmalloc(sizeof(struct procid));
this_proc->pid = proc_id;
this_proc->next = pid_list;
pid_list = this_proc;
}
} else {
printf("Unexpected result in processing anon sample"
" directory\n");
}
}
for (id = pid_list; id; id = nxt) {
free(id->pid);
nxt = id->next;
free(id);
}
}
static void _add_jitdumps_to_deletion_list(void * all_jitdumps, char const * jitdump_dir )
{
struct list_head * jd_fnames = (struct list_head *) all_jitdumps;
struct list_head * pos1, *pos2;
size_t dir_len = strlen(jitdump_dir);
list_for_each_safe(pos1, pos2, jd_fnames) {
struct pathname * dmpfile =
list_entry(pos1, struct pathname, neighbor);
struct stat mystat;
char dmpfile_pathname[dir_len + 20];
int fd;
memset(dmpfile_pathname, '\0', dir_len + 20);
strcpy(dmpfile_pathname, jitdump_dir);
strcat(dmpfile_pathname,dmpfile->name);
fd = open(dmpfile_pathname, O_RDONLY);
if (fd < 0) {
// Non-fatal error, so just display debug message and continue
verbprintf(debug, "opjitconv: cannot open jitdump file %s\n",
dmpfile_pathname);
continue;
}
if (fstat(fd, &mystat) < 0) {
// Non-fatal error, so just display debug message and continue
verbprintf(debug, "opjitconv: cannot fstat jitdump file");
close(fd);
continue;
}
close(fd);
if (geteuid() == mystat.st_uid) {
struct jitdump_deletion_candidate * jdc =
xmalloc(sizeof(struct jitdump_deletion_candidate));
jdc->name = xstrdup(dmpfile->name);
list_add(&jdc->neighbor, &jitdump_deletion_candidates);
}
}
}
static int op_process_jit_dumpfiles(char const * session_dir,
unsigned long long start_time, unsigned long long end_time)
{
struct list_head * pos1, * pos2;
int rc = OP_JIT_CONV_OK;
char jitdumpfile[PATH_MAX + 1];
char oprofile_tmp_template[PATH_MAX + 1];
char const * jitdump_dir = "/tmp/.oprofile/jitdump/";
LIST_HEAD(jd_fnames);
char const * anon_dir_filter = "*/{dep}/{anon:anon}/[0-9]*.*";
LIST_HEAD(anon_dnames);
char const * samples_subdir = "/samples/current";
int samples_dir_len = strlen(session_dir) + strlen(samples_subdir);
char * samples_dir;
/* temporary working directory for dump file conversion step */
char * tmp_conv_dir = NULL;
if (non_root)
sprintf(oprofile_tmp_template, "%s/tmp", session_dir);
else
strcpy(oprofile_tmp_template, "/tmp/oprofile.XXXXXX");
/* Create a temporary working directory used for the conversion step.
*/
if (non_root) {
sprintf(sys_cmd_buffer, "/bin/rm -rf %s", oprofile_tmp_template);
if (system(sys_cmd_buffer) != 0) {
printf("opjitconv: Removing temporary working directory %s failed.\n",
oprofile_tmp_template);
rc = OP_JIT_CONV_TMPDIR_NOT_REMOVED;
} else {
if (!mkdir(oprofile_tmp_template, S_IRWXU | S_IRWXG ))
tmp_conv_dir = oprofile_tmp_template;
}
} else {
tmp_conv_dir = mkdtemp(oprofile_tmp_template);
}
if (tmp_conv_dir == NULL) {
printf("opjitconv: Temporary working directory %s cannot be created.\n",
oprofile_tmp_template);
perror("Exiting due to error");
rc = OP_JIT_CONV_FAIL;
goto out;
}
errno = 0;
if ((rc = get_matching_pathnames(&jd_fnames, get_pathname,
jitdump_dir, "*.dump", NO_RECURSION)) < 0
|| list_empty(&jd_fnames)) {
if (errno) {
if (errno != ENOENT) {
char msg[PATH_MAX];
strcpy(msg, "opjitconv: fatal error trying to find JIT dump files in ");
strcat(msg, jitdump_dir);
perror(msg);
rc = OP_JIT_CONV_FAIL;
} else {
verbprintf(debug, "opjitconv: Non-fatal error trying to find JIT dump files in %s: %s\n",
jitdump_dir, strerror(errno));
rc = OP_JIT_CONV_NO_DUMPFILE;
}
}
goto rm_tmp;
}
if (delete_jitdumps)
_add_jitdumps_to_deletion_list(&jd_fnames, jitdump_dir);
/* Get user information (i.e. UID and GID) for special user 'oprofile'.
*/
if (non_root) {
pw_oprofile = NULL;
} else {
pw_oprofile = getpwnam("oprofile");
if (pw_oprofile == NULL) {
printf("opjitconv: User information for special user oprofile cannot be found.\n");
rc = OP_JIT_CONV_FAIL;
goto rm_tmp;
}
}
/* Change ownership of the temporary working directory to prevent other users
* to attack conversion process.
*/
if (change_owner(tmp_conv_dir) != 0) {
printf("opjitconv: Changing ownership of temporary directory failed.\n");
rc = OP_JIT_CONV_FAIL;
goto rm_tmp;
}
samples_dir = xmalloc(samples_dir_len + 1);
sprintf(samples_dir, "%s%s", session_dir, samples_subdir);
if (get_matching_pathnames(&anon_dnames, get_pathname,
samples_dir, anon_dir_filter,
MATCH_DIR_ONLY_RECURSION) < 0
|| list_empty(&anon_dnames)) {
rc = OP_JIT_CONV_NO_ANON_SAMPLES;
goto rm_tmp;
}
/* When using get_matching_pathnames to find anon samples,
* the list that's returned may contain multiple entries for
* one or more processes; e.g.,
* 6868.0x100000.0x103000
* 6868.0xdfe77000.0xdec40000
* 7012.0x100000.0x103000
* 7012.0xdfe77000.0xdec40000
*
* So we must filter the list so there's only one entry per
* process.
*/
filter_anon_samples_list(&anon_dnames);
/* get_matching_pathnames returns only filename segment when
* NO_RECURSION is passed, so below, we add back the JIT
* dump directory path to the name.
*/
list_for_each_safe(pos1, pos2, &jd_fnames) {
struct pathname * dmpfile =
list_entry(pos1, struct pathname, neighbor);
strncpy(jitdumpfile, jitdump_dir, PATH_MAX);
strncat(jitdumpfile, dmpfile->name, PATH_MAX);
rc = process_jit_dumpfile(jitdumpfile, &anon_dnames,
start_time, end_time, tmp_conv_dir);
if (rc == OP_JIT_CONV_FAIL) {
verbprintf(debug, "JIT convert error %d\n", rc);
goto rm_tmp;
}
delete_pathname(dmpfile);
}
delete_path_names_list(&anon_dnames);
rm_tmp:
/* Delete temporary working directory with all its files
* (i.e. dump and ELF file).
*/
sprintf(sys_cmd_buffer, "/bin/rm -rf '%s'", tmp_conv_dir);
if (system(sys_cmd_buffer) != 0) {
printf("opjitconv: Removing temporary working directory failed.\n");
rc = OP_JIT_CONV_TMPDIR_NOT_REMOVED;
}
out:
return rc;
}
static void _cleanup_jitdumps(void)
{
struct list_head * pos1, *pos2;
char const * jitdump_dir = "/tmp/.oprofile/jitdump/";
size_t dir_len = strlen(jitdump_dir);
char dmpfile_pathname[dir_len + 20];
char proc_fd_dir[PATH_MAX];
if (!delete_jitdumps)
return;
/* The delete_jitdumps flag tells us to try to delete the jitdump files we found
* that belong to this user. Only operf should pass the --delete-jitdumps
* argument to opjitconv since legacy oprofile uses opcontrol to delete old
* jitdump files.
*
* The code below will only delete jitdump files that are not currently
* being used by another process.
*/
list_for_each_safe(pos1, pos2, &jitdump_deletion_candidates) {
DIR * dir;
struct dirent * dirent;
int pid;
size_t dmpfile_name_len;
int do_not_delete = 0;
struct jitdump_deletion_candidate * cand = list_entry(pos1,
struct jitdump_deletion_candidate,
neighbor);
memset(dmpfile_pathname, '\0', dir_len + 20);
memset(proc_fd_dir, '\0', PATH_MAX);
if ((sscanf(cand->name, "%d", &pid)) != 1) {
verbprintf(debug, "Cannot get process id from jitdump file %s\n",
cand->name);
continue;
}
strcpy(dmpfile_pathname, jitdump_dir);
strcat(dmpfile_pathname, cand->name);
dmpfile_name_len = strlen(dmpfile_pathname);
sprintf(proc_fd_dir, "/proc/%d/fd/", pid);
if ((dir = opendir(proc_fd_dir))) {
size_t proc_fd_dir_len = strlen(proc_fd_dir);
while ((dirent = readdir(dir))) {
if (dirent->d_type == DT_LNK) {
char buf[1024];
char fname[1024];
memset(buf, '\0', 1024);
memset(fname, '\0', 1024);
memset(buf, '\0', 1024);
strcpy(fname, proc_fd_dir);
strncat(fname, dirent->d_name, 1023 - proc_fd_dir_len);
if (readlink(fname, buf, 1023) > 0) {
verbprintf(debug, "readlink found for %s\n", buf);
if (strncmp(buf, dmpfile_pathname,
dmpfile_name_len) == 0) {
do_not_delete = 1;
break;
}
}
}
}
closedir(dir);
}
if (!do_not_delete) {
if (remove(dmpfile_pathname))
verbprintf(debug, "Unable to delete %s: %s\n", dmpfile_pathname,
strerror(errno));
}
}
list_for_each_safe(pos1, pos2, &jitdump_deletion_candidates) {
struct jitdump_deletion_candidate * pname = list_entry(pos1,
struct jitdump_deletion_candidate,
neighbor);
free(pname->name);
list_del(&pname->neighbor);
free(pname);
}
}
int main(int argc, char ** argv)
{
unsigned long long start_time, end_time;
char session_dir[PATH_MAX];
int rc = 0;
size_t sessdir_len = 0;
char * path_end;
debug = 0;
if (argc > 1 && strcmp(argv[1], "-d") == 0) {
debug = 1;
argc--;
argv++;
}
non_root = 0;
if (argc > 1 && strcmp(argv[1], "--non-root") == 0) {
non_root = 1;
argc--;
argv++;
}
delete_jitdumps = 0;
if (argc > 1 && strcmp(argv[1], "--delete-jitdumps") == 0) {
delete_jitdumps = 1;
argc--;
argv++;
}
if (argc != 4) {
printf("Usage: opjitconv [-d] <session_dir> <starttime>"
" <endtime>\n");
fflush(stdout);
rc = EXIT_FAILURE;
goto out;
}
/*
* Check for a maximum of 4096 bytes (Linux path name length limit) decremented
* by 16 bytes (will be used later for appending samples sub directory).
* Integer overflows according to the session dir parameter (user controlled)
* are not possible anymore.
*/
path_end = memchr(argv[1], '\0', PATH_MAX);
if (!path_end || ((sessdir_len = (path_end - argv[1])) >= PATH_MAX - 16)) {
printf("opjitconv: Path name length limit exceeded for session directory\n");
rc = EXIT_FAILURE;
goto out;
}
memset(session_dir, '\0', PATH_MAX);
assert(sessdir_len < (PATH_MAX - 16 - 1));
strncpy(session_dir, argv[1], sessdir_len);
session_dir[PATH_MAX -1] = '\0';
start_time = atol(argv[2]);
end_time = atol(argv[3]);
if (start_time > end_time) {
rc = EXIT_FAILURE;
goto out;
}
verbprintf(debug, "start time/end time is %llu/%llu\n",
start_time, end_time);
rc = op_process_jit_dumpfiles(session_dir, start_time, end_time);
if (delete_jitdumps)
_cleanup_jitdumps();
if (rc > OP_JIT_CONV_OK) {
verbprintf(debug, "opjitconv: Ending with rc = %d. This code"
" is usually OK, but can be useful for debugging"
" purposes.\n", rc);
rc = OP_JIT_CONV_OK;
}
fflush(stdout);
if (rc == OP_JIT_CONV_OK)
rc = EXIT_SUCCESS;
else
rc = EXIT_FAILURE;
out:
_exit(rc);
}