// 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 #include #include #include #include #include #include #include #include #include #include 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 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 __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; } static void kill_and_wait(int pid, int* status) { kill(-pid, SIGKILL); kill(pid, SIGKILL); int i; for (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"); } static void execute_one(void); #define WAIT_FLAGS __WALL static void loop(void) { int iter; for (iter = 0;; iter++) { int pid = fork(); if (pid < 0) exit(1); if (pid == 0) { setup_test(); execute_one(); 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 < 5 * 1000) continue; kill_and_wait(pid, &status); break; } } } #ifndef __NR_io_uring_enter #define __NR_io_uring_enter 426 #endif uint64_t r[4] = {0xffffffffffffffff, 0xffffffffffffffff, 0x0, 0x0}; void execute_one(void) { 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(0x6ad4, 0x20000080, 0x20001000, 0x206d4000, 0x20000180, 0x20000040); if (res != -1) { r[0] = res; r[1] = *(uint32_t*)0x20000098; r[2] = *(uint64_t*)0x20000180; r[3] = *(uint64_t*)0x20000040; } *(uint8_t*)0x200001c0 = 0x14; *(uint8_t*)0x200001c1 = 4; *(uint16_t*)0x200001c2 = 0; *(uint32_t*)0x200001c4 = 0; *(uint64_t*)0x200001c8 = 0; *(uint64_t*)0x200001d0 = 0x20000240; *(uint32_t*)0x20000240 = -1; *(uint32_t*)0x200001d8 = 1; *(uint32_t*)0x200001dc = 0; *(uint64_t*)0x200001e0 = 0; *(uint16_t*)0x200001e8 = 0; *(uint16_t*)0x200001ea = 0; *(uint8_t*)0x200001ec = 0; *(uint8_t*)0x200001ed = 0; *(uint8_t*)0x200001ee = 0; *(uint8_t*)0x200001ef = 0; *(uint8_t*)0x200001f0 = 0; *(uint8_t*)0x200001f1 = 0; *(uint8_t*)0x200001f2 = 0; *(uint8_t*)0x200001f3 = 0; *(uint8_t*)0x200001f4 = 0; *(uint8_t*)0x200001f5 = 0; *(uint8_t*)0x200001f6 = 0; *(uint8_t*)0x200001f7 = 0; *(uint8_t*)0x200001f8 = 0; *(uint8_t*)0x200001f9 = 0; *(uint8_t*)0x200001fa = 0; *(uint8_t*)0x200001fb = 0; *(uint8_t*)0x200001fc = 0; *(uint8_t*)0x200001fd = 0; *(uint8_t*)0x200001fe = 0; *(uint8_t*)0x200001ff = 0; syz_io_uring_submit(r[2], r[3], 0x200001c0, 0); *(uint32_t*)0x20001080 = 0; *(uint32_t*)0x20001084 = 0; *(uint32_t*)0x20001088 = 3; *(uint32_t*)0x2000108c = 0; *(uint64_t*)0x20001090 = 0; *(uint64_t*)0x20001098 = 0; *(uint64_t*)0x200010a0 = 0; *(uint64_t*)0x200010a8 = 0; *(uint64_t*)0x200010b0 = 0; *(uint64_t*)0x200010b8 = 0; *(uint32_t*)0x200010c0 = 0; *(uint32_t*)0x200010c4 = 8; *(uint64_t*)0x200010c8 = 0x81; *(uint64_t*)0x200010d0 = 0xdc4c; *(uint64_t*)0x200010d8 = 0; *(uint64_t*)0x200010e0 = 0; *(uint64_t*)0x200010e8 = 0; *(uint64_t*)0x200010f0 = 0; *(uint64_t*)0x200010f8 = 0; *(uint32_t*)0x20001100 = 0xfffffffa; *(uint32_t*)0x20001104 = 0xfffffeff; *(uint64_t*)0x20001108 = 5; *(uint64_t*)0x20001110 = 1; *(uint64_t*)0x20001118 = 0x8001; *(uint64_t*)0x20001120 = 4; *(uint64_t*)0x20001128 = 0; *(uint64_t*)0x20001130 = 0; *(uint64_t*)0x20001138 = 0; *(uint8_t*)0x20001140 = 0; *(uint8_t*)0x20001141 = 0; *(uint8_t*)0x20001142 = 0; *(uint8_t*)0x20001143 = 0; *(uint8_t*)0x20001144 = 0; *(uint8_t*)0x20001145 = 0; *(uint8_t*)0x20001146 = 0; *(uint8_t*)0x20001147 = 0; *(uint8_t*)0x20001148 = 0; *(uint8_t*)0x20001149 = 0; *(uint8_t*)0x2000114a = 0; *(uint8_t*)0x2000114b = 0; *(uint8_t*)0x2000114c = 0; *(uint8_t*)0x2000114d = 0; *(uint8_t*)0x2000114e = 0; *(uint8_t*)0x2000114f = 0; *(uint8_t*)0x20001150 = 0; *(uint8_t*)0x20001151 = 0; *(uint8_t*)0x20001152 = 0; *(uint8_t*)0x20001153 = 0; *(uint8_t*)0x20001154 = 0; *(uint8_t*)0x20001155 = 0; *(uint8_t*)0x20001156 = 0; *(uint8_t*)0x20001157 = 0; *(uint8_t*)0x20001158 = 0; *(uint8_t*)0x20001159 = 0; *(uint8_t*)0x2000115a = 0; *(uint8_t*)0x2000115b = 0; *(uint8_t*)0x2000115c = 0; *(uint8_t*)0x2000115d = 0; *(uint8_t*)0x2000115e = 0; *(uint8_t*)0x2000115f = 0; *(uint8_t*)0x20001160 = 0; *(uint8_t*)0x20001161 = 0; *(uint8_t*)0x20001162 = 0; *(uint8_t*)0x20001163 = 0; *(uint8_t*)0x20001164 = 0; *(uint8_t*)0x20001165 = 0; *(uint8_t*)0x20001166 = 0; *(uint8_t*)0x20001167 = 0; *(uint8_t*)0x20001168 = 0; *(uint8_t*)0x20001169 = 0; *(uint8_t*)0x2000116a = 0; *(uint8_t*)0x2000116b = 0; *(uint8_t*)0x2000116c = 0; *(uint8_t*)0x2000116d = 0; *(uint8_t*)0x2000116e = 0; *(uint8_t*)0x2000116f = 0; *(uint8_t*)0x20001170 = 0; *(uint8_t*)0x20001171 = 0; *(uint8_t*)0x20001172 = 0; *(uint8_t*)0x20001173 = 0; *(uint8_t*)0x20001174 = 0; *(uint8_t*)0x20001175 = 0; *(uint8_t*)0x20001176 = 0; *(uint8_t*)0x20001177 = 0; *(uint8_t*)0x20001178 = 0; *(uint8_t*)0x20001179 = 0; *(uint8_t*)0x2000117a = 0; *(uint8_t*)0x2000117b = 0; *(uint8_t*)0x2000117c = 0; *(uint8_t*)0x2000117d = 0; *(uint8_t*)0x2000117e = 0; *(uint8_t*)0x2000117f = 0; *(uint8_t*)0x20001180 = 0; *(uint8_t*)0x20001181 = 0; *(uint8_t*)0x20001182 = 0; *(uint8_t*)0x20001183 = 0; *(uint8_t*)0x20001184 = 0; *(uint8_t*)0x20001185 = 0; *(uint8_t*)0x20001186 = 0; *(uint8_t*)0x20001187 = 0; *(uint8_t*)0x20001188 = 0; *(uint8_t*)0x20001189 = 0; *(uint8_t*)0x2000118a = 0; *(uint8_t*)0x2000118b = 0; *(uint8_t*)0x2000118c = 0; *(uint8_t*)0x2000118d = 0; *(uint8_t*)0x2000118e = 0; *(uint8_t*)0x2000118f = 0; *(uint8_t*)0x20001190 = 0; *(uint8_t*)0x20001191 = 0; *(uint8_t*)0x20001192 = 0; *(uint8_t*)0x20001193 = 0; *(uint8_t*)0x20001194 = 0; *(uint8_t*)0x20001195 = 0; *(uint8_t*)0x20001196 = 0; *(uint8_t*)0x20001197 = 0; *(uint8_t*)0x20001198 = 0; *(uint8_t*)0x20001199 = 0; *(uint8_t*)0x2000119a = 0; *(uint8_t*)0x2000119b = 0; *(uint8_t*)0x2000119c = 0; *(uint8_t*)0x2000119d = 0; *(uint8_t*)0x2000119e = 0; *(uint8_t*)0x2000119f = 0; *(uint8_t*)0x200011a0 = 0; *(uint8_t*)0x200011a1 = 0; *(uint8_t*)0x200011a2 = 0; *(uint8_t*)0x200011a3 = 0; *(uint8_t*)0x200011a4 = 0; *(uint8_t*)0x200011a5 = 0; *(uint8_t*)0x200011a6 = 0; *(uint8_t*)0x200011a7 = 0; *(uint8_t*)0x200011a8 = 0; *(uint8_t*)0x200011a9 = 0; *(uint8_t*)0x200011aa = 0; *(uint8_t*)0x200011ab = 0; *(uint8_t*)0x200011ac = 0; *(uint8_t*)0x200011ad = 0; *(uint8_t*)0x200011ae = 0; *(uint8_t*)0x200011af = 0; *(uint8_t*)0x200011b0 = 0; *(uint8_t*)0x200011b1 = 0; *(uint8_t*)0x200011b2 = 0; *(uint8_t*)0x200011b3 = 0; *(uint8_t*)0x200011b4 = 0; *(uint8_t*)0x200011b5 = 0; *(uint8_t*)0x200011b6 = 0; *(uint8_t*)0x200011b7 = 0; *(uint8_t*)0x200011b8 = 0; *(uint8_t*)0x200011b9 = 0; *(uint8_t*)0x200011ba = 0; *(uint8_t*)0x200011bb = 0; *(uint8_t*)0x200011bc = 0; *(uint8_t*)0x200011bd = 0; *(uint8_t*)0x200011be = 0; *(uint8_t*)0x200011bf = 0; *(uint8_t*)0x200011c0 = 0; *(uint8_t*)0x200011c1 = 0; *(uint8_t*)0x200011c2 = 0; *(uint8_t*)0x200011c3 = 0; *(uint8_t*)0x200011c4 = 0; *(uint8_t*)0x200011c5 = 0; *(uint8_t*)0x200011c6 = 0; *(uint8_t*)0x200011c7 = 0; *(uint8_t*)0x200011c8 = 0; *(uint8_t*)0x200011c9 = 0; *(uint8_t*)0x200011ca = 0; *(uint8_t*)0x200011cb = 0; *(uint8_t*)0x200011cc = 0; *(uint8_t*)0x200011cd = 0; *(uint8_t*)0x200011ce = 0; *(uint8_t*)0x200011cf = 0; *(uint8_t*)0x200011d0 = 0; *(uint8_t*)0x200011d1 = 0; *(uint8_t*)0x200011d2 = 0; *(uint8_t*)0x200011d3 = 0; *(uint8_t*)0x200011d4 = 0; *(uint8_t*)0x200011d5 = 0; *(uint8_t*)0x200011d6 = 0; *(uint8_t*)0x200011d7 = 0; *(uint8_t*)0x200011d8 = 0; *(uint8_t*)0x200011d9 = 0; *(uint8_t*)0x200011da = 0; *(uint8_t*)0x200011db = 0; *(uint8_t*)0x200011dc = 0; *(uint8_t*)0x200011dd = 0; *(uint8_t*)0x200011de = 0; *(uint8_t*)0x200011df = 0; *(uint8_t*)0x200011e0 = 0; *(uint8_t*)0x200011e1 = 0; *(uint8_t*)0x200011e2 = 0; *(uint8_t*)0x200011e3 = 0; *(uint8_t*)0x200011e4 = 0; *(uint8_t*)0x200011e5 = 0; *(uint8_t*)0x200011e6 = 0; *(uint8_t*)0x200011e7 = 0; *(uint8_t*)0x200011e8 = 0; *(uint8_t*)0x200011e9 = 0; *(uint8_t*)0x200011ea = 0; *(uint8_t*)0x200011eb = 0; *(uint8_t*)0x200011ec = 0; *(uint8_t*)0x200011ed = 0; *(uint8_t*)0x200011ee = 0; *(uint8_t*)0x200011ef = 0; *(uint8_t*)0x200011f0 = 0; *(uint8_t*)0x200011f1 = 0; *(uint8_t*)0x200011f2 = 0; *(uint8_t*)0x200011f3 = 0; *(uint8_t*)0x200011f4 = 0; *(uint8_t*)0x200011f5 = 0; *(uint8_t*)0x200011f6 = 0; *(uint8_t*)0x200011f7 = 0; *(uint8_t*)0x200011f8 = 0; *(uint8_t*)0x200011f9 = 0; *(uint8_t*)0x200011fa = 0; *(uint8_t*)0x200011fb = 0; *(uint8_t*)0x200011fc = 0; *(uint8_t*)0x200011fd = 0; *(uint8_t*)0x200011fe = 0; *(uint8_t*)0x200011ff = 0; syscall(__NR_ioctl, r[1], 0xc0c0583b, 0x20001080ul); syscall(__NR_io_uring_enter, r[0], 0x450c, 0, 0ul, 0ul, 0ul); } 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); loop(); return 0; }