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 "helpers.h"
19 #include "../src/syscall.h"
20
21 #define SIZEOF_IO_URING_SQE 64
22 #define SIZEOF_IO_URING_CQE 16
23 #define SQ_HEAD_OFFSET 0
24 #define SQ_TAIL_OFFSET 64
25 #define SQ_RING_MASK_OFFSET 256
26 #define SQ_RING_ENTRIES_OFFSET 264
27 #define SQ_FLAGS_OFFSET 276
28 #define SQ_DROPPED_OFFSET 272
29 #define CQ_HEAD_OFFSET 128
30 #define CQ_TAIL_OFFSET 192
31 #define CQ_RING_MASK_OFFSET 260
32 #define CQ_RING_ENTRIES_OFFSET 268
33 #define CQ_RING_OVERFLOW_OFFSET 284
34 #define CQ_FLAGS_OFFSET 280
35 #define CQ_CQES_OFFSET 320
36
syz_io_uring_setup(volatile long a0,volatile long a1,volatile long a2,volatile long a3,volatile long a4,volatile long a5)37 static long syz_io_uring_setup(volatile long a0, volatile long a1,
38 volatile long a2, volatile long a3,
39 volatile long a4, volatile long a5)
40 {
41 uint32_t entries = (uint32_t)a0;
42 struct io_uring_params* setup_params = (struct io_uring_params*)a1;
43 void* vma1 = (void*)a2;
44 void* vma2 = (void*)a3;
45 void** ring_ptr_out = (void**)a4;
46 void** sqes_ptr_out = (void**)a5;
47 uint32_t fd_io_uring = __sys_io_uring_setup(entries, setup_params);
48 uint32_t sq_ring_sz =
49 setup_params->sq_off.array + setup_params->sq_entries * sizeof(uint32_t);
50 uint32_t cq_ring_sz = setup_params->cq_off.cqes +
51 setup_params->cq_entries * SIZEOF_IO_URING_CQE;
52 uint32_t ring_sz = sq_ring_sz > cq_ring_sz ? sq_ring_sz : cq_ring_sz;
53 *ring_ptr_out = mmap(vma1, ring_sz, PROT_READ | PROT_WRITE,
54 MAP_SHARED | MAP_POPULATE | MAP_FIXED, fd_io_uring,
55 IORING_OFF_SQ_RING);
56 if (*ring_ptr_out == MAP_FAILED)
57 exit(0);
58 uint32_t sqes_sz = setup_params->sq_entries * SIZEOF_IO_URING_SQE;
59 *sqes_ptr_out =
60 mmap(vma2, sqes_sz, PROT_READ | PROT_WRITE,
61 MAP_SHARED | MAP_POPULATE | MAP_FIXED, fd_io_uring, IORING_OFF_SQES);
62 if (*sqes_ptr_out == MAP_FAILED)
63 exit(0);
64 return fd_io_uring;
65 }
66
syz_io_uring_submit(volatile long a0,volatile long a1,volatile long a2,volatile long a3)67 static long syz_io_uring_submit(volatile long a0, volatile long a1,
68 volatile long a2, volatile long a3)
69 {
70 char* ring_ptr = (char*)a0;
71 char* sqes_ptr = (char*)a1;
72 char* sqe = (char*)a2;
73 uint32_t sqes_index = (uint32_t)a3;
74 uint32_t sq_ring_entries = *(uint32_t*)(ring_ptr + SQ_RING_ENTRIES_OFFSET);
75 uint32_t cq_ring_entries = *(uint32_t*)(ring_ptr + CQ_RING_ENTRIES_OFFSET);
76 uint32_t sq_array_off =
77 (CQ_CQES_OFFSET + cq_ring_entries * SIZEOF_IO_URING_CQE + 63) & ~63;
78 if (sq_ring_entries)
79 sqes_index %= sq_ring_entries;
80 char* sqe_dest = sqes_ptr + sqes_index * SIZEOF_IO_URING_SQE;
81 memcpy(sqe_dest, sqe, SIZEOF_IO_URING_SQE);
82 uint32_t sq_ring_mask = *(uint32_t*)(ring_ptr + SQ_RING_MASK_OFFSET);
83 uint32_t* sq_tail_ptr = (uint32_t*)(ring_ptr + SQ_TAIL_OFFSET);
84 uint32_t sq_tail = *sq_tail_ptr & sq_ring_mask;
85 uint32_t sq_tail_next = *sq_tail_ptr + 1;
86 uint32_t* sq_array = (uint32_t*)(ring_ptr + sq_array_off);
87 *(sq_array + sq_tail) = sqes_index;
88 __atomic_store_n(sq_tail_ptr, sq_tail_next, __ATOMIC_RELEASE);
89 return 0;
90 }
91
syz_open_dev(volatile long a0,volatile long a1,volatile long a2)92 static long syz_open_dev(volatile long a0, volatile long a1, volatile long a2)
93 {
94 if (a0 == 0xc || a0 == 0xb) {
95 char buf[128];
96 sprintf(buf, "/dev/%s/%d:%d", a0 == 0xc ? "char" : "block", (uint8_t)a1,
97 (uint8_t)a2);
98 return open(buf, O_RDWR, 0);
99 } else {
100 char buf[1024];
101 char* hash;
102 strncpy(buf, (char*)a0, sizeof(buf) - 1);
103 buf[sizeof(buf) - 1] = 0;
104 while ((hash = strchr(buf, '#'))) {
105 *hash = '0' + (char)(a1 % 10);
106 a1 /= 10;
107 }
108 return open(buf, a2, 0);
109 }
110 }
111
112 static uint64_t r[4] = {0xffffffffffffffff, 0x0, 0x0, 0xffffffffffffffff};
113
main(int argc,char * argv[])114 int main(int argc, char *argv[])
115 {
116 void *mmap_ret;
117 #if (!defined(__i386) && !defined(__x86_64__)) || defined(CONFIG_USE_SANITIZER)
118 return T_EXIT_SKIP;
119 #endif
120
121 if (argc > 1)
122 return T_EXIT_SKIP;
123
124 mmap_ret = mmap((void *)0x20000000ul, 0x1000000ul, 7ul, MAP_ANON|MAP_PRIVATE, -1, 0ul);
125 if (mmap_ret == MAP_FAILED)
126 return T_EXIT_SKIP;
127 mmap_ret = mmap((void *)0x21000000ul, 0x1000ul, 0ul, MAP_ANON|MAP_PRIVATE, -1, 0ul);
128 if (mmap_ret == MAP_FAILED)
129 return T_EXIT_SKIP;
130 intptr_t res = 0;
131 *(uint32_t*)0x20000484 = 0;
132 *(uint32_t*)0x20000488 = 0;
133 *(uint32_t*)0x2000048c = 0;
134 *(uint32_t*)0x20000490 = 0;
135 *(uint32_t*)0x20000498 = -1;
136 *(uint32_t*)0x2000049c = 0;
137 *(uint32_t*)0x200004a0 = 0;
138 *(uint32_t*)0x200004a4 = 0;
139 res = -1;
140 res = syz_io_uring_setup(0x6ad4, 0x20000480, 0x20ee7000, 0x20ffb000,
141 0x20000180, 0x20000040);
142 if (res != -1) {
143 r[0] = res;
144 r[1] = *(uint64_t*)0x20000180;
145 r[2] = *(uint64_t*)0x20000040;
146 }
147 res = -1;
148 res = syz_open_dev(0xc, 4, 0x15);
149 if (res != -1)
150 r[3] = res;
151 *(uint8_t*)0x20000000 = 6;
152 *(uint8_t*)0x20000001 = 0;
153 *(uint16_t*)0x20000002 = 0;
154 *(uint32_t*)0x20000004 = r[3];
155 *(uint64_t*)0x20000008 = 0;
156 *(uint64_t*)0x20000010 = 0;
157 *(uint32_t*)0x20000018 = 0;
158 *(uint16_t*)0x2000001c = 0;
159 *(uint16_t*)0x2000001e = 0;
160 *(uint64_t*)0x20000020 = 0;
161 *(uint16_t*)0x20000028 = 0;
162 *(uint16_t*)0x2000002a = 0;
163 *(uint8_t*)0x2000002c = 0;
164 *(uint8_t*)0x2000002d = 0;
165 *(uint8_t*)0x2000002e = 0;
166 *(uint8_t*)0x2000002f = 0;
167 *(uint8_t*)0x20000030 = 0;
168 *(uint8_t*)0x20000031 = 0;
169 *(uint8_t*)0x20000032 = 0;
170 *(uint8_t*)0x20000033 = 0;
171 *(uint8_t*)0x20000034 = 0;
172 *(uint8_t*)0x20000035 = 0;
173 *(uint8_t*)0x20000036 = 0;
174 *(uint8_t*)0x20000037 = 0;
175 *(uint8_t*)0x20000038 = 0;
176 *(uint8_t*)0x20000039 = 0;
177 *(uint8_t*)0x2000003a = 0;
178 *(uint8_t*)0x2000003b = 0;
179 *(uint8_t*)0x2000003c = 0;
180 *(uint8_t*)0x2000003d = 0;
181 *(uint8_t*)0x2000003e = 0;
182 *(uint8_t*)0x2000003f = 0;
183 syz_io_uring_submit(r[1], r[2], 0x20000000, 0);
184 __sys_io_uring_enter(r[0], 0x20450c, 0, 0ul, 0ul);
185 *(uint32_t*)0x20000080 = 0x7ff;
186 *(uint32_t*)0x20000084 = 0x8b7;
187 *(uint32_t*)0x20000088 = 3;
188 *(uint32_t*)0x2000008c = 0x101;
189 *(uint8_t*)0x20000090 = 9;
190 memcpy((void*)0x20000091, "\xaf\x09\x01\xbc\xf9\xc6\xe4\x92\x86\x51\x7d\x7f"
191 "\xbd\x43\x7d\x16\x69\x3e\x05",
192 19);
193 ioctl(r[3], 0x5404, 0x20000080ul);
194 return T_EXIT_PASS;
195 }
196