1 // https://syzkaller.appspot.com/bug?id=5c9918d20f771265ad0ffae3c8f3859d24850692
2 // autogenerated by syzkaller (https://github.com/google/syzkaller)
3
4 #include <endian.h>
5 #include <fcntl.h>
6 #include <stdint.h>
7 #include <stdio.h>
8 #include <stdlib.h>
9 #include <string.h>
10 #include <sys/mman.h>
11 #include <sys/stat.h>
12 #include <sys/types.h>
13 #include <sys/ioctl.h>
14 #include <unistd.h>
15
16 #include "liburing.h"
17 #include "../src/syscall.h"
18
19 #define SIZEOF_IO_URING_SQE 64
20 #define SIZEOF_IO_URING_CQE 16
21 #define SQ_HEAD_OFFSET 0
22 #define SQ_TAIL_OFFSET 64
23 #define SQ_RING_MASK_OFFSET 256
24 #define SQ_RING_ENTRIES_OFFSET 264
25 #define SQ_FLAGS_OFFSET 276
26 #define SQ_DROPPED_OFFSET 272
27 #define CQ_HEAD_OFFSET 128
28 #define CQ_TAIL_OFFSET 192
29 #define CQ_RING_MASK_OFFSET 260
30 #define CQ_RING_ENTRIES_OFFSET 268
31 #define CQ_RING_OVERFLOW_OFFSET 284
32 #define CQ_FLAGS_OFFSET 280
33 #define CQ_CQES_OFFSET 320
34
syz_io_uring_setup(volatile long a0,volatile long a1,volatile long a2,volatile long a3,volatile long a4,volatile long a5)35 static long syz_io_uring_setup(volatile long a0, volatile long a1,
36 volatile long a2, volatile long a3,
37 volatile long a4, volatile long a5)
38 {
39 uint32_t entries = (uint32_t)a0;
40 struct io_uring_params* setup_params = (struct io_uring_params*)a1;
41 void* vma1 = (void*)a2;
42 void* vma2 = (void*)a3;
43 void** ring_ptr_out = (void**)a4;
44 void** sqes_ptr_out = (void**)a5;
45 uint32_t fd_io_uring = __sys_io_uring_setup(entries, setup_params);
46 uint32_t sq_ring_sz =
47 setup_params->sq_off.array + setup_params->sq_entries * sizeof(uint32_t);
48 uint32_t cq_ring_sz = setup_params->cq_off.cqes +
49 setup_params->cq_entries * SIZEOF_IO_URING_CQE;
50 uint32_t ring_sz = sq_ring_sz > cq_ring_sz ? sq_ring_sz : cq_ring_sz;
51 *ring_ptr_out = mmap(vma1, ring_sz, PROT_READ | PROT_WRITE,
52 MAP_SHARED | MAP_POPULATE | MAP_FIXED, fd_io_uring,
53 IORING_OFF_SQ_RING);
54 uint32_t sqes_sz = setup_params->sq_entries * SIZEOF_IO_URING_SQE;
55 *sqes_ptr_out =
56 mmap(vma2, sqes_sz, PROT_READ | PROT_WRITE,
57 MAP_SHARED | MAP_POPULATE | MAP_FIXED, fd_io_uring, IORING_OFF_SQES);
58 return fd_io_uring;
59 }
60
syz_io_uring_submit(volatile long a0,volatile long a1,volatile long a2,volatile long a3)61 static long syz_io_uring_submit(volatile long a0, volatile long a1,
62 volatile long a2, volatile long a3)
63 {
64 char* ring_ptr = (char*)a0;
65 char* sqes_ptr = (char*)a1;
66 char* sqe = (char*)a2;
67 uint32_t sqes_index = (uint32_t)a3;
68 uint32_t sq_ring_entries = *(uint32_t*)(ring_ptr + SQ_RING_ENTRIES_OFFSET);
69 uint32_t cq_ring_entries = *(uint32_t*)(ring_ptr + CQ_RING_ENTRIES_OFFSET);
70 uint32_t sq_array_off =
71 (CQ_CQES_OFFSET + cq_ring_entries * SIZEOF_IO_URING_CQE + 63) & ~63;
72 if (sq_ring_entries)
73 sqes_index %= sq_ring_entries;
74 char* sqe_dest = sqes_ptr + sqes_index * SIZEOF_IO_URING_SQE;
75 memcpy(sqe_dest, sqe, SIZEOF_IO_URING_SQE);
76 uint32_t sq_ring_mask = *(uint32_t*)(ring_ptr + SQ_RING_MASK_OFFSET);
77 uint32_t* sq_tail_ptr = (uint32_t*)(ring_ptr + SQ_TAIL_OFFSET);
78 uint32_t sq_tail = *sq_tail_ptr & sq_ring_mask;
79 uint32_t sq_tail_next = *sq_tail_ptr + 1;
80 uint32_t* sq_array = (uint32_t*)(ring_ptr + sq_array_off);
81 *(sq_array + sq_tail) = sqes_index;
82 __atomic_store_n(sq_tail_ptr, sq_tail_next, __ATOMIC_RELEASE);
83 return 0;
84 }
85
syz_open_dev(volatile long a0,volatile long a1,volatile long a2)86 static long syz_open_dev(volatile long a0, volatile long a1, volatile long a2)
87 {
88 if (a0 == 0xc || a0 == 0xb) {
89 char buf[128];
90 sprintf(buf, "/dev/%s/%d:%d", a0 == 0xc ? "char" : "block", (uint8_t)a1,
91 (uint8_t)a2);
92 return open(buf, O_RDWR, 0);
93 } else {
94 char buf[1024];
95 char* hash;
96 strncpy(buf, (char*)a0, sizeof(buf) - 1);
97 buf[sizeof(buf) - 1] = 0;
98 while ((hash = strchr(buf, '#'))) {
99 *hash = '0' + (char)(a1 % 10);
100 a1 /= 10;
101 }
102 return open(buf, a2, 0);
103 }
104 }
105
106 #ifndef __NR_io_uring_enter
107 #define __NR_io_uring_enter 426
108 #endif
109
110 uint64_t r[4] = {0xffffffffffffffff, 0x0, 0x0, 0xffffffffffffffff};
111
main(int argc,char * argv[])112 int main(int argc, char *argv[])
113 {
114
115 if (argc > 1)
116 return 0;
117
118 mmap((void *)0x1ffff000ul, 0x1000ul, 0ul, 0x32ul, -1, 0ul);
119 mmap((void *)0x20000000ul, 0x1000000ul, 7ul, 0x32ul, -1, 0ul);
120 mmap((void *)0x21000000ul, 0x1000ul, 0ul, 0x32ul, -1, 0ul);
121 intptr_t res = 0;
122 *(uint32_t*)0x20000484 = 0;
123 *(uint32_t*)0x20000488 = 0;
124 *(uint32_t*)0x2000048c = 0;
125 *(uint32_t*)0x20000490 = 0;
126 *(uint32_t*)0x20000498 = -1;
127 *(uint32_t*)0x2000049c = 0;
128 *(uint32_t*)0x200004a0 = 0;
129 *(uint32_t*)0x200004a4 = 0;
130 res = -1;
131 res = syz_io_uring_setup(0x6ad4, 0x20000480, 0x20ee7000, 0x20ffb000,
132 0x20000180, 0x20000040);
133 if (res != -1) {
134 r[0] = res;
135 r[1] = *(uint64_t*)0x20000180;
136 r[2] = *(uint64_t*)0x20000040;
137 }
138 res = -1;
139 res = syz_open_dev(0xc, 4, 0x15);
140 if (res != -1)
141 r[3] = res;
142 *(uint8_t*)0x20000000 = 6;
143 *(uint8_t*)0x20000001 = 0;
144 *(uint16_t*)0x20000002 = 0;
145 *(uint32_t*)0x20000004 = r[3];
146 *(uint64_t*)0x20000008 = 0;
147 *(uint64_t*)0x20000010 = 0;
148 *(uint32_t*)0x20000018 = 0;
149 *(uint16_t*)0x2000001c = 0;
150 *(uint16_t*)0x2000001e = 0;
151 *(uint64_t*)0x20000020 = 0;
152 *(uint16_t*)0x20000028 = 0;
153 *(uint16_t*)0x2000002a = 0;
154 *(uint8_t*)0x2000002c = 0;
155 *(uint8_t*)0x2000002d = 0;
156 *(uint8_t*)0x2000002e = 0;
157 *(uint8_t*)0x2000002f = 0;
158 *(uint8_t*)0x20000030 = 0;
159 *(uint8_t*)0x20000031 = 0;
160 *(uint8_t*)0x20000032 = 0;
161 *(uint8_t*)0x20000033 = 0;
162 *(uint8_t*)0x20000034 = 0;
163 *(uint8_t*)0x20000035 = 0;
164 *(uint8_t*)0x20000036 = 0;
165 *(uint8_t*)0x20000037 = 0;
166 *(uint8_t*)0x20000038 = 0;
167 *(uint8_t*)0x20000039 = 0;
168 *(uint8_t*)0x2000003a = 0;
169 *(uint8_t*)0x2000003b = 0;
170 *(uint8_t*)0x2000003c = 0;
171 *(uint8_t*)0x2000003d = 0;
172 *(uint8_t*)0x2000003e = 0;
173 *(uint8_t*)0x2000003f = 0;
174 syz_io_uring_submit(r[1], r[2], 0x20000000, 0);
175 __sys_io_uring_enter(r[0], 0x20450c, 0, 0ul, 0ul);
176 *(uint32_t*)0x20000080 = 0x7ff;
177 *(uint32_t*)0x20000084 = 0x8b7;
178 *(uint32_t*)0x20000088 = 3;
179 *(uint32_t*)0x2000008c = 0x101;
180 *(uint8_t*)0x20000090 = 9;
181 memcpy((void*)0x20000091, "\xaf\x09\x01\xbc\xf9\xc6\xe4\x92\x86\x51\x7d\x7f"
182 "\xbd\x43\x7d\x16\x69\x3e\x05",
183 19);
184 ioctl(r[3], 0x5404, 0x20000080ul);
185 return 0;
186 }
187