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136fc5c4 TH |
1 | #!/usr/bin/env perl |
2 | # | |
3 | # (c) 2017 Tobin C. Harding <me@tobin.cc> | |
4 | # Licensed under the terms of the GNU GPL License version 2 | |
5 | # | |
1410fe4e | 6 | # leaking_addresses.pl: Scan the kernel for potential leaking addresses. |
136fc5c4 TH |
7 | # - Scans dmesg output. |
8 | # - Walks directory tree and parses each file (for each directory in @DIRS). | |
9 | # | |
136fc5c4 TH |
10 | # Use --debug to output path before parsing, this is useful to find files that |
11 | # cause the script to choke. | |
136fc5c4 TH |
12 | |
13 | use warnings; | |
14 | use strict; | |
15 | use POSIX; | |
16 | use File::Basename; | |
17 | use File::Spec; | |
18 | use Cwd 'abs_path'; | |
19 | use Term::ANSIColor qw(:constants); | |
20 | use Getopt::Long qw(:config no_auto_abbrev); | |
62139c12 | 21 | use Config; |
87e37588 | 22 | use bigint qw/hex/; |
2f042c93 | 23 | use feature 'state'; |
136fc5c4 TH |
24 | |
25 | my $P = $0; | |
26 | my $V = '0.01'; | |
27 | ||
28 | # Directories to scan. | |
29 | my @DIRS = ('/proc', '/sys'); | |
30 | ||
dd98c252 TH |
31 | # Timer for parsing each file, in seconds. |
32 | my $TIMEOUT = 10; | |
33 | ||
1410fe4e TH |
34 | # Kernel addresses vary by architecture. We can only auto-detect the following |
35 | # architectures (using `uname -m`). (flag --32-bit overrides auto-detection.) | |
36 | my @SUPPORTED_ARCHITECTURES = ('x86_64', 'ppc64', 'x86'); | |
62139c12 | 37 | |
136fc5c4 TH |
38 | # Command line options. |
39 | my $help = 0; | |
40 | my $debug = 0; | |
d09bd8da TH |
41 | my $raw = 0; |
42 | my $output_raw = ""; # Write raw results to file. | |
43 | my $input_raw = ""; # Read raw results from file instead of scanning. | |
d09bd8da TH |
44 | my $suppress_dmesg = 0; # Don't show dmesg in output. |
45 | my $squash_by_path = 0; # Summary report grouped by absolute path. | |
46 | my $squash_by_filename = 0; # Summary report grouped by filename. | |
f9d2a42d | 47 | my $kernel_config_file = ""; # Kernel configuration file. |
1410fe4e TH |
48 | my $opt_32bit = 0; # Scan 32-bit kernel. |
49 | my $page_offset_32bit = 0; # Page offset for 32-bit kernel. | |
136fc5c4 TH |
50 | |
51 | # Do not parse these files (absolute path). | |
52 | my @skip_parse_files_abs = ('/proc/kmsg', | |
53 | '/proc/kcore', | |
54 | '/proc/fs/ext4/sdb1/mb_groups', | |
55 | '/proc/1/fd/3', | |
1c1e3be0 TH |
56 | '/sys/firmware/devicetree', |
57 | '/proc/device-tree', | |
136fc5c4 TH |
58 | '/sys/kernel/debug/tracing/trace_pipe', |
59 | '/sys/kernel/security/apparmor/revision'); | |
60 | ||
a284733e | 61 | # Do not parse these files under any subdirectory. |
136fc5c4 TH |
62 | my @skip_parse_files_any = ('0', |
63 | '1', | |
64 | '2', | |
65 | 'pagemap', | |
66 | 'events', | |
67 | 'access', | |
68 | 'registers', | |
69 | 'snapshot_raw', | |
70 | 'trace_pipe_raw', | |
71 | 'ptmx', | |
72 | 'trace_pipe'); | |
73 | ||
74 | # Do not walk these directories (absolute path). | |
75 | my @skip_walk_dirs_abs = (); | |
76 | ||
77 | # Do not walk these directories under any subdirectory. | |
78 | my @skip_walk_dirs_any = ('self', | |
79 | 'thread-self', | |
80 | 'cwd', | |
81 | 'fd', | |
1c1e3be0 | 82 | 'usbmon', |
136fc5c4 TH |
83 | 'stderr', |
84 | 'stdin', | |
85 | 'stdout'); | |
86 | ||
87 | sub help | |
88 | { | |
89 | my ($exitcode) = @_; | |
90 | ||
91 | print << "EOM"; | |
d09bd8da | 92 | |
136fc5c4 TH |
93 | Usage: $P [OPTIONS] |
94 | Version: $V | |
95 | ||
96 | Options: | |
97 | ||
15d60a35 TH |
98 | -o, --output-raw=<file> Save results for future processing. |
99 | -i, --input-raw=<file> Read results from file instead of scanning. | |
100 | --raw Show raw results (default). | |
101 | --suppress-dmesg Do not show dmesg results. | |
102 | --squash-by-path Show one result per unique path. | |
103 | --squash-by-filename Show one result per unique filename. | |
f9d2a42d | 104 | --kernel-config-file=<file> Kernel configuration file (e.g /boot/config) |
1410fe4e TH |
105 | --32-bit Scan 32-bit kernel. |
106 | --page-offset-32-bit=o Page offset (for 32-bit kernel 0xABCD1234). | |
15d60a35 TH |
107 | -d, --debug Display debugging output. |
108 | -h, --help, --version Display this help and exit. | |
d09bd8da | 109 | |
1410fe4e | 110 | Scans the running kernel for potential leaking addresses. |
136fc5c4 TH |
111 | |
112 | EOM | |
113 | exit($exitcode); | |
114 | } | |
115 | ||
116 | GetOptions( | |
136fc5c4 TH |
117 | 'd|debug' => \$debug, |
118 | 'h|help' => \$help, | |
d09bd8da TH |
119 | 'version' => \$help, |
120 | 'o|output-raw=s' => \$output_raw, | |
121 | 'i|input-raw=s' => \$input_raw, | |
122 | 'suppress-dmesg' => \$suppress_dmesg, | |
123 | 'squash-by-path' => \$squash_by_path, | |
124 | 'squash-by-filename' => \$squash_by_filename, | |
125 | 'raw' => \$raw, | |
f9d2a42d | 126 | 'kernel-config-file=s' => \$kernel_config_file, |
1410fe4e TH |
127 | '32-bit' => \$opt_32bit, |
128 | 'page-offset-32-bit=o' => \$page_offset_32bit, | |
136fc5c4 TH |
129 | ) or help(1); |
130 | ||
131 | help(0) if ($help); | |
132 | ||
d09bd8da TH |
133 | if ($input_raw) { |
134 | format_output($input_raw); | |
135 | exit(0); | |
136 | } | |
137 | ||
138 | if (!$input_raw and ($squash_by_path or $squash_by_filename)) { | |
139 | printf "\nSummary reporting only available with --input-raw=<file>\n"; | |
140 | printf "(First run scan with --output-raw=<file>.)\n"; | |
141 | exit(128); | |
142 | } | |
143 | ||
1410fe4e | 144 | if (!(is_supported_architecture() or $opt_32bit or $page_offset_32bit)) { |
62139c12 TH |
145 | printf "\nScript does not support your architecture, sorry.\n"; |
146 | printf "\nCurrently we support: \n\n"; | |
147 | foreach(@SUPPORTED_ARCHITECTURES) { | |
148 | printf "\t%s\n", $_; | |
149 | } | |
6efb7458 | 150 | printf("\n"); |
62139c12 | 151 | |
1410fe4e TH |
152 | printf("If you are running a 32-bit architecture you may use:\n"); |
153 | printf("\n\t--32-bit or --page-offset-32-bit=<page offset>\n\n"); | |
154 | ||
6efb7458 TH |
155 | my $archname = `uname -m`; |
156 | printf("Machine hardware name (`uname -m`): %s\n", $archname); | |
62139c12 TH |
157 | |
158 | exit(129); | |
159 | } | |
160 | ||
d09bd8da TH |
161 | if ($output_raw) { |
162 | open my $fh, '>', $output_raw or die "$0: $output_raw: $!\n"; | |
163 | select $fh; | |
164 | } | |
165 | ||
136fc5c4 TH |
166 | parse_dmesg(); |
167 | walk(@DIRS); | |
168 | ||
169 | exit 0; | |
170 | ||
136fc5c4 TH |
171 | sub dprint |
172 | { | |
173 | printf(STDERR @_) if $debug; | |
174 | } | |
175 | ||
62139c12 TH |
176 | sub is_supported_architecture |
177 | { | |
1410fe4e TH |
178 | return (is_x86_64() or is_ppc64() or is_ix86_32()); |
179 | } | |
180 | ||
181 | sub is_32bit | |
182 | { | |
183 | # Allow --32-bit or --page-offset-32-bit to override | |
184 | if ($opt_32bit or $page_offset_32bit) { | |
185 | return 1; | |
186 | } | |
187 | ||
188 | return is_ix86_32(); | |
189 | } | |
190 | ||
191 | sub is_ix86_32 | |
192 | { | |
193 | my $arch = `uname -m`; | |
194 | ||
195 | chomp $arch; | |
196 | if ($arch =~ m/i[3456]86/) { | |
197 | return 1; | |
198 | } | |
199 | return 0; | |
62139c12 TH |
200 | } |
201 | ||
5eb0da05 | 202 | sub is_arch |
62139c12 | 203 | { |
5eb0da05 TH |
204 | my ($desc) = @_; |
205 | my $arch = `uname -m`; | |
206 | ||
207 | chomp $arch; | |
208 | if ($arch eq $desc) { | |
209 | return 1; | |
210 | } | |
211 | return 0; | |
212 | } | |
62139c12 | 213 | |
5eb0da05 TH |
214 | sub is_x86_64 |
215 | { | |
216 | return is_arch('x86_64'); | |
62139c12 TH |
217 | } |
218 | ||
219 | sub is_ppc64 | |
220 | { | |
5eb0da05 | 221 | return is_arch('ppc64'); |
62139c12 TH |
222 | } |
223 | ||
f9d2a42d TH |
224 | # Gets config option value from kernel config file. |
225 | # Returns "" on error or if config option not found. | |
226 | sub get_kernel_config_option | |
227 | { | |
228 | my ($option) = @_; | |
229 | my $value = ""; | |
230 | my $tmp_file = ""; | |
231 | my @config_files; | |
232 | ||
233 | # Allow --kernel-config-file to override. | |
234 | if ($kernel_config_file ne "") { | |
235 | @config_files = ($kernel_config_file); | |
236 | } elsif (-R "/proc/config.gz") { | |
237 | my $tmp_file = "/tmp/tmpkconf"; | |
238 | ||
239 | if (system("gunzip < /proc/config.gz > $tmp_file")) { | |
240 | dprint "$0: system(gunzip < /proc/config.gz) failed\n"; | |
241 | return ""; | |
242 | } else { | |
243 | @config_files = ($tmp_file); | |
244 | } | |
245 | } else { | |
246 | my $file = '/boot/config-' . `uname -r`; | |
247 | chomp $file; | |
248 | @config_files = ($file, '/boot/config'); | |
249 | } | |
250 | ||
251 | foreach my $file (@config_files) { | |
252 | dprint("parsing config file: %s\n", $file); | |
253 | $value = option_from_file($option, $file); | |
254 | if ($value ne "") { | |
255 | last; | |
256 | } | |
257 | } | |
258 | ||
259 | if ($tmp_file ne "") { | |
260 | system("rm -f $tmp_file"); | |
261 | } | |
262 | ||
263 | return $value; | |
264 | } | |
265 | ||
266 | # Parses $file and returns kernel configuration option value. | |
267 | sub option_from_file | |
268 | { | |
269 | my ($option, $file) = @_; | |
270 | my $str = ""; | |
271 | my $val = ""; | |
272 | ||
273 | open(my $fh, "<", $file) or return ""; | |
274 | while (my $line = <$fh> ) { | |
275 | if ($line =~ /^$option/) { | |
276 | ($str, $val) = split /=/, $line; | |
277 | chomp $val; | |
278 | last; | |
279 | } | |
280 | } | |
281 | ||
282 | close $fh; | |
283 | return $val; | |
284 | } | |
285 | ||
136fc5c4 TH |
286 | sub is_false_positive |
287 | { | |
7e5758f7 TH |
288 | my ($match) = @_; |
289 | ||
1410fe4e TH |
290 | if (is_32bit()) { |
291 | return is_false_positive_32bit($match); | |
292 | } | |
293 | ||
294 | # 64 bit false positives. | |
295 | ||
7e5758f7 TH |
296 | if ($match =~ '\b(0x)?(f|F){16}\b' or |
297 | $match =~ '\b(0x)?0{16}\b') { | |
298 | return 1; | |
299 | } | |
136fc5c4 | 300 | |
87e37588 TH |
301 | if (is_x86_64() and is_in_vsyscall_memory_region($match)) { |
302 | return 1; | |
7e5758f7 | 303 | } |
136fc5c4 | 304 | |
7e5758f7 | 305 | return 0; |
136fc5c4 TH |
306 | } |
307 | ||
1410fe4e TH |
308 | sub is_false_positive_32bit |
309 | { | |
310 | my ($match) = @_; | |
311 | state $page_offset = get_page_offset(); | |
312 | ||
313 | if ($match =~ '\b(0x)?(f|F){8}\b') { | |
314 | return 1; | |
315 | } | |
316 | ||
317 | if (hex($match) < $page_offset) { | |
318 | return 1; | |
319 | } | |
320 | ||
321 | return 0; | |
322 | } | |
323 | ||
324 | # returns integer value | |
325 | sub get_page_offset | |
326 | { | |
327 | my $page_offset; | |
328 | my $default_offset = 0xc0000000; | |
329 | ||
330 | # Allow --page-offset-32bit to override. | |
331 | if ($page_offset_32bit != 0) { | |
332 | return $page_offset_32bit; | |
333 | } | |
334 | ||
335 | $page_offset = get_kernel_config_option('CONFIG_PAGE_OFFSET'); | |
336 | if (!$page_offset) { | |
337 | return $default_offset; | |
338 | } | |
339 | return $page_offset; | |
340 | } | |
341 | ||
87e37588 TH |
342 | sub is_in_vsyscall_memory_region |
343 | { | |
344 | my ($match) = @_; | |
345 | ||
346 | my $hex = hex($match); | |
347 | my $region_min = hex("0xffffffffff600000"); | |
348 | my $region_max = hex("0xffffffffff601000"); | |
349 | ||
350 | return ($hex >= $region_min and $hex <= $region_max); | |
351 | } | |
352 | ||
136fc5c4 TH |
353 | # True if argument potentially contains a kernel address. |
354 | sub may_leak_address | |
355 | { | |
7e5758f7 | 356 | my ($line) = @_; |
62139c12 | 357 | my $address_re; |
136fc5c4 | 358 | |
7e5758f7 TH |
359 | # Signal masks. |
360 | if ($line =~ '^SigBlk:' or | |
a11949ec | 361 | $line =~ '^SigIgn:' or |
7e5758f7 TH |
362 | $line =~ '^SigCgt:') { |
363 | return 0; | |
364 | } | |
136fc5c4 | 365 | |
7e5758f7 TH |
366 | if ($line =~ '\bKEY=[[:xdigit:]]{14} [[:xdigit:]]{16} [[:xdigit:]]{16}\b' or |
367 | $line =~ '\b[[:xdigit:]]{14} [[:xdigit:]]{16} [[:xdigit:]]{16}\b') { | |
136fc5c4 | 368 | return 0; |
7e5758f7 | 369 | } |
136fc5c4 | 370 | |
2f042c93 | 371 | $address_re = get_address_re(); |
62139c12 | 372 | while (/($address_re)/g) { |
7e5758f7 TH |
373 | if (!is_false_positive($1)) { |
374 | return 1; | |
375 | } | |
376 | } | |
136fc5c4 | 377 | |
7e5758f7 | 378 | return 0; |
136fc5c4 TH |
379 | } |
380 | ||
2f042c93 TH |
381 | sub get_address_re |
382 | { | |
1410fe4e | 383 | if (is_ppc64()) { |
2f042c93 | 384 | return '\b(0x)?[89abcdef]00[[:xdigit:]]{13}\b'; |
1410fe4e TH |
385 | } elsif (is_32bit()) { |
386 | return '\b(0x)?[[:xdigit:]]{8}\b'; | |
2f042c93 | 387 | } |
1410fe4e TH |
388 | |
389 | return get_x86_64_re(); | |
2f042c93 TH |
390 | } |
391 | ||
392 | sub get_x86_64_re | |
393 | { | |
394 | # We handle page table levels but only if explicitly configured using | |
395 | # CONFIG_PGTABLE_LEVELS. If config file parsing fails or config option | |
396 | # is not found we default to using address regular expression suitable | |
397 | # for 4 page table levels. | |
398 | state $ptl = get_kernel_config_option('CONFIG_PGTABLE_LEVELS'); | |
399 | ||
400 | if ($ptl == 5) { | |
401 | return '\b(0x)?ff[[:xdigit:]]{14}\b'; | |
402 | } | |
403 | return '\b(0x)?ffff[[:xdigit:]]{12}\b'; | |
404 | } | |
405 | ||
136fc5c4 TH |
406 | sub parse_dmesg |
407 | { | |
408 | open my $cmd, '-|', 'dmesg'; | |
409 | while (<$cmd>) { | |
410 | if (may_leak_address($_)) { | |
411 | print 'dmesg: ' . $_; | |
412 | } | |
413 | } | |
414 | close $cmd; | |
415 | } | |
416 | ||
417 | # True if we should skip this path. | |
418 | sub skip | |
419 | { | |
420 | my ($path, $paths_abs, $paths_any) = @_; | |
421 | ||
422 | foreach (@$paths_abs) { | |
423 | return 1 if (/^$path$/); | |
424 | } | |
425 | ||
426 | my($filename, $dirs, $suffix) = fileparse($path); | |
427 | foreach (@$paths_any) { | |
428 | return 1 if (/^$filename$/); | |
429 | } | |
430 | ||
431 | return 0; | |
432 | } | |
433 | ||
434 | sub skip_parse | |
435 | { | |
436 | my ($path) = @_; | |
437 | return skip($path, \@skip_parse_files_abs, \@skip_parse_files_any); | |
438 | } | |
439 | ||
dd98c252 TH |
440 | sub timed_parse_file |
441 | { | |
442 | my ($file) = @_; | |
443 | ||
444 | eval { | |
445 | local $SIG{ALRM} = sub { die "alarm\n" }; # NB: \n required. | |
446 | alarm $TIMEOUT; | |
447 | parse_file($file); | |
448 | alarm 0; | |
449 | }; | |
450 | ||
451 | if ($@) { | |
452 | die unless $@ eq "alarm\n"; # Propagate unexpected errors. | |
453 | printf STDERR "timed out parsing: %s\n", $file; | |
454 | } | |
455 | } | |
456 | ||
136fc5c4 TH |
457 | sub parse_file |
458 | { | |
459 | my ($file) = @_; | |
460 | ||
461 | if (! -R $file) { | |
462 | return; | |
463 | } | |
464 | ||
e2858cad TH |
465 | if (! -T $file) { |
466 | return; | |
467 | } | |
468 | ||
136fc5c4 TH |
469 | if (skip_parse($file)) { |
470 | dprint "skipping file: $file\n"; | |
471 | return; | |
472 | } | |
473 | dprint "parsing: $file\n"; | |
474 | ||
475 | open my $fh, "<", $file or return; | |
476 | while ( <$fh> ) { | |
477 | if (may_leak_address($_)) { | |
478 | print $file . ': ' . $_; | |
479 | } | |
480 | } | |
481 | close $fh; | |
482 | } | |
483 | ||
484 | ||
485 | # True if we should skip walking this directory. | |
486 | sub skip_walk | |
487 | { | |
488 | my ($path) = @_; | |
489 | return skip($path, \@skip_walk_dirs_abs, \@skip_walk_dirs_any) | |
490 | } | |
491 | ||
492 | # Recursively walk directory tree. | |
493 | sub walk | |
494 | { | |
495 | my @dirs = @_; | |
136fc5c4 TH |
496 | |
497 | while (my $pwd = shift @dirs) { | |
498 | next if (skip_walk($pwd)); | |
499 | next if (!opendir(DIR, $pwd)); | |
500 | my @files = readdir(DIR); | |
501 | closedir(DIR); | |
502 | ||
503 | foreach my $file (@files) { | |
504 | next if ($file eq '.' or $file eq '..'); | |
505 | ||
506 | my $path = "$pwd/$file"; | |
507 | next if (-l $path); | |
508 | ||
509 | if (-d $path) { | |
510 | push @dirs, $path; | |
511 | } else { | |
dd98c252 | 512 | timed_parse_file($path); |
136fc5c4 TH |
513 | } |
514 | } | |
515 | } | |
516 | } | |
d09bd8da TH |
517 | |
518 | sub format_output | |
519 | { | |
520 | my ($file) = @_; | |
521 | ||
522 | # Default is to show raw results. | |
523 | if ($raw or (!$squash_by_path and !$squash_by_filename)) { | |
524 | dump_raw_output($file); | |
525 | return; | |
526 | } | |
527 | ||
528 | my ($total, $dmesg, $paths, $files) = parse_raw_file($file); | |
529 | ||
530 | printf "\nTotal number of results from scan (incl dmesg): %d\n", $total; | |
531 | ||
532 | if (!$suppress_dmesg) { | |
533 | print_dmesg($dmesg); | |
534 | } | |
535 | ||
536 | if ($squash_by_filename) { | |
537 | squash_by($files, 'filename'); | |
538 | } | |
539 | ||
540 | if ($squash_by_path) { | |
541 | squash_by($paths, 'path'); | |
542 | } | |
543 | } | |
544 | ||
545 | sub dump_raw_output | |
546 | { | |
547 | my ($file) = @_; | |
548 | ||
549 | open (my $fh, '<', $file) or die "$0: $file: $!\n"; | |
550 | while (<$fh>) { | |
551 | if ($suppress_dmesg) { | |
552 | if ("dmesg:" eq substr($_, 0, 6)) { | |
553 | next; | |
554 | } | |
555 | } | |
556 | print $_; | |
557 | } | |
558 | close $fh; | |
559 | } | |
560 | ||
561 | sub parse_raw_file | |
562 | { | |
563 | my ($file) = @_; | |
564 | ||
565 | my $total = 0; # Total number of lines parsed. | |
566 | my @dmesg; # dmesg output. | |
567 | my %files; # Unique filenames containing leaks. | |
568 | my %paths; # Unique paths containing leaks. | |
569 | ||
570 | open (my $fh, '<', $file) or die "$0: $file: $!\n"; | |
571 | while (my $line = <$fh>) { | |
572 | $total++; | |
573 | ||
574 | if ("dmesg:" eq substr($line, 0, 6)) { | |
575 | push @dmesg, $line; | |
576 | next; | |
577 | } | |
578 | ||
579 | cache_path(\%paths, $line); | |
580 | cache_filename(\%files, $line); | |
581 | } | |
582 | ||
583 | return $total, \@dmesg, \%paths, \%files; | |
584 | } | |
585 | ||
586 | sub print_dmesg | |
587 | { | |
588 | my ($dmesg) = @_; | |
589 | ||
590 | print "\ndmesg output:\n"; | |
591 | ||
592 | if (@$dmesg == 0) { | |
593 | print "<no results>\n"; | |
594 | return; | |
595 | } | |
596 | ||
597 | foreach(@$dmesg) { | |
598 | my $index = index($_, ': '); | |
599 | $index += 2; # skid ': ' | |
600 | print substr($_, $index); | |
601 | } | |
602 | } | |
603 | ||
604 | sub squash_by | |
605 | { | |
606 | my ($ref, $desc) = @_; | |
607 | ||
608 | print "\nResults squashed by $desc (excl dmesg). "; | |
609 | print "Displaying [<number of results> <$desc>], <example result>\n"; | |
610 | ||
611 | if (keys %$ref == 0) { | |
612 | print "<no results>\n"; | |
613 | return; | |
614 | } | |
615 | ||
616 | foreach(keys %$ref) { | |
617 | my $lines = $ref->{$_}; | |
618 | my $length = @$lines; | |
619 | printf "[%d %s] %s", $length, $_, @$lines[0]; | |
620 | } | |
621 | } | |
622 | ||
623 | sub cache_path | |
624 | { | |
625 | my ($paths, $line) = @_; | |
626 | ||
627 | my $index = index($line, ': '); | |
628 | my $path = substr($line, 0, $index); | |
629 | ||
630 | $index += 2; # skip ': ' | |
631 | add_to_cache($paths, $path, substr($line, $index)); | |
632 | } | |
633 | ||
634 | sub cache_filename | |
635 | { | |
636 | my ($files, $line) = @_; | |
637 | ||
638 | my $index = index($line, ': '); | |
639 | my $path = substr($line, 0, $index); | |
640 | my $filename = basename($path); | |
641 | ||
642 | $index += 2; # skip ': ' | |
643 | add_to_cache($files, $filename, substr($line, $index)); | |
644 | } | |
645 | ||
646 | sub add_to_cache | |
647 | { | |
648 | my ($cache, $key, $value) = @_; | |
649 | ||
650 | if (!$cache->{$key}) { | |
651 | $cache->{$key} = (); | |
652 | } | |
653 | push @{$cache->{$key}}, $value; | |
654 | } |