1 /* SPDX-License-Identifier: MIT */
2 // https://syzkaller.appspot.com/bug?id=5c9918d20f771265ad0ffae3c8f3859d24850692
3 // autogenerated by syzkaller (https://github.com/google/syzkaller)
4
5 #include <endian.h>
6 #include <fcntl.h>
7 #include <stdint.h>
8 #include <stdio.h>
9 #include <stdlib.h>
10 #include <string.h>
11 #include <sys/mman.h>
12 #include <sys/stat.h>
13 #include <sys/types.h>
14 #include <sys/ioctl.h>
15 #include <unistd.h>
16
17 #include "liburing.h"
18 #include "../src/syscall.h"
19
20 #define SIZEOF_IO_URING_SQE 64
21 #define SIZEOF_IO_URING_CQE 16
22 #define SQ_HEAD_OFFSET 0
23 #define SQ_TAIL_OFFSET 64
24 #define SQ_RING_MASK_OFFSET 256
25 #define SQ_RING_ENTRIES_OFFSET 264
26 #define SQ_FLAGS_OFFSET 276
27 #define SQ_DROPPED_OFFSET 272
28 #define CQ_HEAD_OFFSET 128
29 #define CQ_TAIL_OFFSET 192
30 #define CQ_RING_MASK_OFFSET 260
31 #define CQ_RING_ENTRIES_OFFSET 268
32 #define CQ_RING_OVERFLOW_OFFSET 284
33 #define CQ_FLAGS_OFFSET 280
34 #define CQ_CQES_OFFSET 320
35
syz_io_uring_setup(volatile long a0,volatile long a1,volatile long a2,volatile long a3,volatile long a4,volatile long a5)36 static long syz_io_uring_setup(volatile long a0, volatile long a1,
37 volatile long a2, volatile long a3,
38 volatile long a4, volatile long a5)
39 {
40 uint32_t entries = (uint32_t)a0;
41 struct io_uring_params* setup_params = (struct io_uring_params*)a1;
42 void* vma1 = (void*)a2;
43 void* vma2 = (void*)a3;
44 void** ring_ptr_out = (void**)a4;
45 void** sqes_ptr_out = (void**)a5;
46 uint32_t fd_io_uring = __sys_io_uring_setup(entries, setup_params);
47 uint32_t sq_ring_sz =
48 setup_params->sq_off.array + setup_params->sq_entries * sizeof(uint32_t);
49 uint32_t cq_ring_sz = setup_params->cq_off.cqes +
50 setup_params->cq_entries * SIZEOF_IO_URING_CQE;
51 uint32_t ring_sz = sq_ring_sz > cq_ring_sz ? sq_ring_sz : cq_ring_sz;
52 *ring_ptr_out = mmap(vma1, ring_sz, PROT_READ | PROT_WRITE,
53 MAP_SHARED | MAP_POPULATE | MAP_FIXED, fd_io_uring,
54 IORING_OFF_SQ_RING);
55 if (*ring_ptr_out == MAP_FAILED)
56 exit(0);
57 uint32_t sqes_sz = setup_params->sq_entries * SIZEOF_IO_URING_SQE;
58 *sqes_ptr_out =
59 mmap(vma2, sqes_sz, PROT_READ | PROT_WRITE,
60 MAP_SHARED | MAP_POPULATE | MAP_FIXED, fd_io_uring, IORING_OFF_SQES);
61 if (*sqes_ptr_out == MAP_FAILED)
62 exit(0);
63 return fd_io_uring;
64 }
65
syz_io_uring_submit(volatile long a0,volatile long a1,volatile long a2,volatile long a3)66 static long syz_io_uring_submit(volatile long a0, volatile long a1,
67 volatile long a2, volatile long a3)
68 {
69 char* ring_ptr = (char*)a0;
70 char* sqes_ptr = (char*)a1;
71 char* sqe = (char*)a2;
72 uint32_t sqes_index = (uint32_t)a3;
73 uint32_t sq_ring_entries = *(uint32_t*)(ring_ptr + SQ_RING_ENTRIES_OFFSET);
74 uint32_t cq_ring_entries = *(uint32_t*)(ring_ptr + CQ_RING_ENTRIES_OFFSET);
75 uint32_t sq_array_off =
76 (CQ_CQES_OFFSET + cq_ring_entries * SIZEOF_IO_URING_CQE + 63) & ~63;
77 if (sq_ring_entries)
78 sqes_index %= sq_ring_entries;
79 char* sqe_dest = sqes_ptr + sqes_index * SIZEOF_IO_URING_SQE;
80 memcpy(sqe_dest, sqe, SIZEOF_IO_URING_SQE);
81 uint32_t sq_ring_mask = *(uint32_t*)(ring_ptr + SQ_RING_MASK_OFFSET);
82 uint32_t* sq_tail_ptr = (uint32_t*)(ring_ptr + SQ_TAIL_OFFSET);
83 uint32_t sq_tail = *sq_tail_ptr & sq_ring_mask;
84 uint32_t sq_tail_next = *sq_tail_ptr + 1;
85 uint32_t* sq_array = (uint32_t*)(ring_ptr + sq_array_off);
86 *(sq_array + sq_tail) = sqes_index;
87 __atomic_store_n(sq_tail_ptr, sq_tail_next, __ATOMIC_RELEASE);
88 return 0;
89 }
90
syz_open_dev(volatile long a0,volatile long a1,volatile long a2)91 static long syz_open_dev(volatile long a0, volatile long a1, volatile long a2)
92 {
93 if (a0 == 0xc || a0 == 0xb) {
94 char buf[128];
95 sprintf(buf, "/dev/%s/%d:%d", a0 == 0xc ? "char" : "block", (uint8_t)a1,
96 (uint8_t)a2);
97 return open(buf, O_RDWR, 0);
98 } else {
99 char buf[1024];
100 char* hash;
101 strncpy(buf, (char*)a0, sizeof(buf) - 1);
102 buf[sizeof(buf) - 1] = 0;
103 while ((hash = strchr(buf, '#'))) {
104 *hash = '0' + (char)(a1 % 10);
105 a1 /= 10;
106 }
107 return open(buf, a2, 0);
108 }
109 }
110
111 uint64_t r[4] = {0xffffffffffffffff, 0x0, 0x0, 0xffffffffffffffff};
112
main(int argc,char * argv[])113 int main(int argc, char *argv[])
114 {
115 void *mmap_ret;
116 #if !defined(__i386) && !defined(__x86_64__)
117 return 0;
118 #endif
119
120 if (argc > 1)
121 return 0;
122
123 mmap_ret = mmap((void *)0x20000000ul, 0x1000000ul, 7ul, 0x32ul, -1, 0ul);
124 if (mmap_ret == MAP_FAILED)
125 return 0;
126 mmap_ret = mmap((void *)0x21000000ul, 0x1000ul, 0ul, 0x32ul, -1, 0ul);
127 if (mmap_ret == MAP_FAILED)
128 return 0;
129 intptr_t res = 0;
130 *(uint32_t*)0x20000484 = 0;
131 *(uint32_t*)0x20000488 = 0;
132 *(uint32_t*)0x2000048c = 0;
133 *(uint32_t*)0x20000490 = 0;
134 *(uint32_t*)0x20000498 = -1;
135 *(uint32_t*)0x2000049c = 0;
136 *(uint32_t*)0x200004a0 = 0;
137 *(uint32_t*)0x200004a4 = 0;
138 res = -1;
139 res = syz_io_uring_setup(0x6ad4, 0x20000480, 0x20ee7000, 0x20ffb000,
140 0x20000180, 0x20000040);
141 if (res != -1) {
142 r[0] = res;
143 r[1] = *(uint64_t*)0x20000180;
144 r[2] = *(uint64_t*)0x20000040;
145 }
146 res = -1;
147 res = syz_open_dev(0xc, 4, 0x15);
148 if (res != -1)
149 r[3] = res;
150 *(uint8_t*)0x20000000 = 6;
151 *(uint8_t*)0x20000001 = 0;
152 *(uint16_t*)0x20000002 = 0;
153 *(uint32_t*)0x20000004 = r[3];
154 *(uint64_t*)0x20000008 = 0;
155 *(uint64_t*)0x20000010 = 0;
156 *(uint32_t*)0x20000018 = 0;
157 *(uint16_t*)0x2000001c = 0;
158 *(uint16_t*)0x2000001e = 0;
159 *(uint64_t*)0x20000020 = 0;
160 *(uint16_t*)0x20000028 = 0;
161 *(uint16_t*)0x2000002a = 0;
162 *(uint8_t*)0x2000002c = 0;
163 *(uint8_t*)0x2000002d = 0;
164 *(uint8_t*)0x2000002e = 0;
165 *(uint8_t*)0x2000002f = 0;
166 *(uint8_t*)0x20000030 = 0;
167 *(uint8_t*)0x20000031 = 0;
168 *(uint8_t*)0x20000032 = 0;
169 *(uint8_t*)0x20000033 = 0;
170 *(uint8_t*)0x20000034 = 0;
171 *(uint8_t*)0x20000035 = 0;
172 *(uint8_t*)0x20000036 = 0;
173 *(uint8_t*)0x20000037 = 0;
174 *(uint8_t*)0x20000038 = 0;
175 *(uint8_t*)0x20000039 = 0;
176 *(uint8_t*)0x2000003a = 0;
177 *(uint8_t*)0x2000003b = 0;
178 *(uint8_t*)0x2000003c = 0;
179 *(uint8_t*)0x2000003d = 0;
180 *(uint8_t*)0x2000003e = 0;
181 *(uint8_t*)0x2000003f = 0;
182 syz_io_uring_submit(r[1], r[2], 0x20000000, 0);
183 __sys_io_uring_enter(r[0], 0x20450c, 0, 0ul, 0ul);
184 *(uint32_t*)0x20000080 = 0x7ff;
185 *(uint32_t*)0x20000084 = 0x8b7;
186 *(uint32_t*)0x20000088 = 3;
187 *(uint32_t*)0x2000008c = 0x101;
188 *(uint8_t*)0x20000090 = 9;
189 memcpy((void*)0x20000091, "\xaf\x09\x01\xbc\xf9\xc6\xe4\x92\x86\x51\x7d\x7f"
190 "\xbd\x43\x7d\x16\x69\x3e\x05",
191 19);
192 ioctl(r[3], 0x5404, 0x20000080ul);
193 return 0;
194 }
195