// https://syzkaller.appspot.com/bug?id=dfa0ece589f369f3047982c5a3bd7aef32380298 // autogenerated by syzkaller (https://github.com/google/syzkaller) #define _GNU_SOURCE #include #include #include #include #include #include #include #include #include #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 __NR_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(__NR_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; } #ifndef __NR_io_uring_enter #define __NR_io_uring_enter 426 #endif uint64_t r[4] = {0xffffffffffffffff, 0x0, 0x0, 0xffffffffffffffff}; int main(void) { syscall(__NR_mmap, 0x1ffff000ul, 0x1000ul, 0ul, 0x32ul, -1, 0ul); syscall(__NR_mmap, 0x20000000ul, 0x1000000ul, 7ul, 0x32ul, -1, 0ul); syscall(__NR_mmap, 0x21000000ul, 0x1000ul, 0ul, 0x32ul, -1, 0ul); intptr_t res = 0; *(uint32_t*)0x20000080 = 0; *(uint32_t*)0x20000084 = 0; *(uint32_t*)0x20000088 = 0; *(uint32_t*)0x2000008c = 0; *(uint32_t*)0x20000090 = 0; *(uint32_t*)0x20000094 = 0; *(uint32_t*)0x20000098 = -1; *(uint32_t*)0x2000009c = 0; *(uint32_t*)0x200000a0 = 0; *(uint32_t*)0x200000a4 = 0; *(uint32_t*)0x200000a8 = 0; *(uint32_t*)0x200000ac = 0; *(uint32_t*)0x200000b0 = 0; *(uint32_t*)0x200000b4 = 0; *(uint32_t*)0x200000b8 = 0; *(uint32_t*)0x200000bc = 0; *(uint32_t*)0x200000c0 = 0; *(uint32_t*)0x200000c4 = 0; *(uint32_t*)0x200000c8 = 0; *(uint32_t*)0x200000cc = 0; *(uint32_t*)0x200000d0 = 0; *(uint32_t*)0x200000d4 = 0; *(uint32_t*)0x200000d8 = 0; *(uint32_t*)0x200000dc = 0; *(uint32_t*)0x200000e0 = 0; *(uint32_t*)0x200000e4 = 0; *(uint32_t*)0x200000e8 = 0; *(uint32_t*)0x200000ec = 0; *(uint32_t*)0x200000f0 = 0; *(uint32_t*)0x200000f4 = 0; res = -1; res = syz_io_uring_setup(0x87, 0x20000080, 0x20ee7000, 0x206d4000, 0x20000140, 0x20000040); if (res != -1) { r[0] = res; r[1] = *(uint64_t*)0x20000140; r[2] = *(uint64_t*)0x20000040; } res = syscall(__NR_socket, 2ul, 5ul, 0x84); if (res != -1) r[3] = res; *(uint8_t*)0x20000200 = 0x1b; *(uint8_t*)0x20000201 = 2; *(uint16_t*)0x20000202 = 0; *(uint32_t*)0x20000204 = r[3]; *(uint64_t*)0x20000208 = 0; *(uint64_t*)0x20000210 = 0; *(uint32_t*)0x20000218 = 0; *(uint32_t*)0x2000021c = 0x8103; *(uint64_t*)0x20000220 = 1; *(uint16_t*)0x20000228 = 0; *(uint16_t*)0x2000022a = 0; *(uint8_t*)0x2000022c = 0; *(uint8_t*)0x2000022d = 0; *(uint8_t*)0x2000022e = 0; *(uint8_t*)0x2000022f = 0; *(uint8_t*)0x20000230 = 0; *(uint8_t*)0x20000231 = 0; *(uint8_t*)0x20000232 = 0; *(uint8_t*)0x20000233 = 0; *(uint8_t*)0x20000234 = 0; *(uint8_t*)0x20000235 = 0; *(uint8_t*)0x20000236 = 0; *(uint8_t*)0x20000237 = 0; *(uint8_t*)0x20000238 = 0; *(uint8_t*)0x20000239 = 0; *(uint8_t*)0x2000023a = 0; *(uint8_t*)0x2000023b = 0; *(uint8_t*)0x2000023c = 0; *(uint8_t*)0x2000023d = 0; *(uint8_t*)0x2000023e = 0; *(uint8_t*)0x2000023f = 0; syz_io_uring_submit(r[1], r[2], 0x20000200, 0); *(uint8_t*)0x20000100 = 0x13; *(uint8_t*)0x20000101 = 2; *(uint16_t*)0x20000102 = 0; *(uint32_t*)0x20000104 = -1; *(uint64_t*)0x20000108 = 0; *(uint64_t*)0x20000110 = 0; *(uint32_t*)0x20000118 = 0; *(uint32_t*)0x2000011c = 0; *(uint64_t*)0x20000120 = 0; *(uint16_t*)0x20000128 = 0; *(uint16_t*)0x2000012a = 0; *(uint8_t*)0x2000012c = 0; *(uint8_t*)0x2000012d = 0; *(uint8_t*)0x2000012e = 0; *(uint8_t*)0x2000012f = 0; *(uint8_t*)0x20000130 = 0; *(uint8_t*)0x20000131 = 0; *(uint8_t*)0x20000132 = 0; *(uint8_t*)0x20000133 = 0; *(uint8_t*)0x20000134 = 0; *(uint8_t*)0x20000135 = 0; *(uint8_t*)0x20000136 = 0; *(uint8_t*)0x20000137 = 0; *(uint8_t*)0x20000138 = 0; *(uint8_t*)0x20000139 = 0; *(uint8_t*)0x2000013a = 0; *(uint8_t*)0x2000013b = 0; *(uint8_t*)0x2000013c = 0; *(uint8_t*)0x2000013d = 0; *(uint8_t*)0x2000013e = 0; *(uint8_t*)0x2000013f = 0; syz_io_uring_submit(r[1], r[2], 0x20000100, 4); syscall(__NR_io_uring_enter, r[0], 0x450c, 0, 0ul, 0ul, 0ul); return 0; }