// https://syzkaller.appspot.com/bug?id=3f09d873a6c16174dfc965263a9a5b1d74d25557 // 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 #ifndef __NR_bpf #define __NR_bpf 321 #endif 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; } #define BITMASK(bf_off, bf_len) (((1ull << (bf_len)) - 1) << (bf_off)) #define STORE_BY_BITMASK(type, htobe, addr, val, bf_off, bf_len) \ *(type*)(addr) = \ htobe((htobe(*(type*)(addr)) & ~BITMASK((bf_off), (bf_len))) | \ (((type)(val) << (bf_off)) & BITMASK((bf_off), (bf_len)))) 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; } static void kill_and_wait(int pid, int* status) { kill(-pid, SIGKILL); kill(pid, SIGKILL); for (int 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 = 0; for (;; 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 < 5000) continue; kill_and_wait(pid, &status); break; } } } uint64_t r[3] = {0xffffffffffffffff, 0xffffffffffffffff, 0xffffffffffffffff}; void execute_one(void) { intptr_t res = 0; *(uint32_t*)0x200009c0 = 0x12; *(uint32_t*)0x200009c4 = 5; *(uint32_t*)0x200009c8 = 8; *(uint32_t*)0x200009cc = 1; *(uint32_t*)0x200009d0 = 0; *(uint32_t*)0x200009d4 = -1; *(uint32_t*)0x200009d8 = 0; memset((void*)0x200009dc, 0, 16); *(uint32_t*)0x200009ec = 0; *(uint32_t*)0x200009f0 = -1; *(uint32_t*)0x200009f4 = 0; *(uint32_t*)0x200009f8 = 0; *(uint32_t*)0x200009fc = 0; *(uint64_t*)0x20000a00 = 0; res = syscall(__NR_bpf, /*cmd=*/0ul, /*arg=*/0x200009c0ul, /*size=*/0x48ul); if (res != -1) r[0] = res; res = syscall(__NR_socket, /*domain=*/2ul, /*type=*/2ul, /*proto=*/0); if (res != -1) r[1] = res; *(uint32_t*)0x20000940 = r[0]; *(uint64_t*)0x20000948 = 0x20000780; *(uint64_t*)0x20000950 = 0x20000900; *(uint32_t*)0x20000900 = r[1]; *(uint64_t*)0x20000958 = 0; syscall(__NR_bpf, /*cmd=*/2ul, /*arg=*/0x20000940ul, /*size=*/0x20ul); *(uint32_t*)0x20000000 = 0x11; *(uint32_t*)0x20000004 = 0xc; *(uint64_t*)0x20000008 = 0x200001c0; *(uint8_t*)0x200001c0 = 0x18; STORE_BY_BITMASK(uint8_t, , 0x200001c1, 0, 0, 4); STORE_BY_BITMASK(uint8_t, , 0x200001c1, 0, 4, 4); *(uint16_t*)0x200001c2 = 0; *(uint32_t*)0x200001c4 = 0; *(uint8_t*)0x200001c8 = 0; *(uint8_t*)0x200001c9 = 0; *(uint16_t*)0x200001ca = 0; *(uint32_t*)0x200001cc = 0; *(uint8_t*)0x200001d0 = 0x18; STORE_BY_BITMASK(uint8_t, , 0x200001d1, 1, 0, 4); STORE_BY_BITMASK(uint8_t, , 0x200001d1, 1, 4, 4); *(uint16_t*)0x200001d2 = 0; *(uint32_t*)0x200001d4 = r[0]; *(uint8_t*)0x200001d8 = 0; *(uint8_t*)0x200001d9 = 0; *(uint16_t*)0x200001da = 0; *(uint32_t*)0x200001dc = 0; STORE_BY_BITMASK(uint8_t, , 0x200001e0, 7, 0, 3); STORE_BY_BITMASK(uint8_t, , 0x200001e0, 0, 3, 1); STORE_BY_BITMASK(uint8_t, , 0x200001e0, 0xb, 4, 4); STORE_BY_BITMASK(uint8_t, , 0x200001e1, 8, 0, 4); STORE_BY_BITMASK(uint8_t, , 0x200001e1, 0, 4, 4); *(uint16_t*)0x200001e2 = 0; *(uint32_t*)0x200001e4 = 0; STORE_BY_BITMASK(uint8_t, , 0x200001e8, 3, 0, 3); STORE_BY_BITMASK(uint8_t, , 0x200001e8, 3, 3, 2); STORE_BY_BITMASK(uint8_t, , 0x200001e8, 3, 5, 3); STORE_BY_BITMASK(uint8_t, , 0x200001e9, 0xa, 0, 4); STORE_BY_BITMASK(uint8_t, , 0x200001e9, 8, 4, 4); *(uint16_t*)0x200001ea = 0xfff8; *(uint32_t*)0x200001ec = 0; STORE_BY_BITMASK(uint8_t, , 0x200001f0, 7, 0, 3); STORE_BY_BITMASK(uint8_t, , 0x200001f0, 1, 3, 1); STORE_BY_BITMASK(uint8_t, , 0x200001f0, 0xb, 4, 4); STORE_BY_BITMASK(uint8_t, , 0x200001f1, 2, 0, 4); STORE_BY_BITMASK(uint8_t, , 0x200001f1, 0xa, 4, 4); *(uint16_t*)0x200001f2 = 0; *(uint32_t*)0x200001f4 = 0; STORE_BY_BITMASK(uint8_t, , 0x200001f8, 7, 0, 3); STORE_BY_BITMASK(uint8_t, , 0x200001f8, 0, 3, 1); STORE_BY_BITMASK(uint8_t, , 0x200001f8, 0, 4, 4); STORE_BY_BITMASK(uint8_t, , 0x200001f9, 2, 0, 4); STORE_BY_BITMASK(uint8_t, , 0x200001f9, 0, 4, 4); *(uint16_t*)0x200001fa = 0; *(uint32_t*)0x200001fc = 0xfffffff8; STORE_BY_BITMASK(uint8_t, , 0x20000200, 7, 0, 3); STORE_BY_BITMASK(uint8_t, , 0x20000200, 0, 3, 1); STORE_BY_BITMASK(uint8_t, , 0x20000200, 0xb, 4, 4); STORE_BY_BITMASK(uint8_t, , 0x20000201, 3, 0, 4); STORE_BY_BITMASK(uint8_t, , 0x20000201, 0, 4, 4); *(uint16_t*)0x20000202 = 0; *(uint32_t*)0x20000204 = 8; STORE_BY_BITMASK(uint8_t, , 0x20000208, 7, 0, 3); STORE_BY_BITMASK(uint8_t, , 0x20000208, 0, 3, 1); STORE_BY_BITMASK(uint8_t, , 0x20000208, 0xb, 4, 4); STORE_BY_BITMASK(uint8_t, , 0x20000209, 4, 0, 4); STORE_BY_BITMASK(uint8_t, , 0x20000209, 0, 4, 4); *(uint16_t*)0x2000020a = 0; *(uint32_t*)0x2000020c = 0; *(uint8_t*)0x20000210 = 0x85; *(uint8_t*)0x20000211 = 0; *(uint16_t*)0x20000212 = 0; *(uint32_t*)0x20000214 = 3; *(uint8_t*)0x20000218 = 0x95; *(uint8_t*)0x20000219 = 0; *(uint16_t*)0x2000021a = 0; *(uint32_t*)0x2000021c = 0; *(uint64_t*)0x20000010 = 0x20000240; memcpy((void*)0x20000240, "GPL\000", 4); *(uint32_t*)0x20000018 = 0; *(uint32_t*)0x2000001c = 0; *(uint64_t*)0x20000020 = 0; *(uint32_t*)0x20000028 = 0; *(uint32_t*)0x2000002c = 0; memset((void*)0x20000030, 0, 16); *(uint32_t*)0x20000040 = 0; *(uint32_t*)0x20000044 = 0; *(uint32_t*)0x20000048 = -1; *(uint32_t*)0x2000004c = 0; *(uint64_t*)0x20000050 = 0; *(uint32_t*)0x20000058 = 0; *(uint32_t*)0x2000005c = 0; *(uint64_t*)0x20000060 = 0; *(uint32_t*)0x20000068 = 0; *(uint32_t*)0x2000006c = 0; *(uint32_t*)0x20000070 = 0; *(uint32_t*)0x20000074 = 0; *(uint64_t*)0x20000078 = 0; *(uint64_t*)0x20000080 = 0; *(uint32_t*)0x20000088 = 0; *(uint32_t*)0x2000008c = 0; res = syscall(__NR_bpf, /*cmd=*/5ul, /*arg=*/0x20000000ul, /*size=*/0x90ul); if (res != -1) r[2] = res; *(uint64_t*)0x200006c0 = 0x20000300; memcpy((void*)0x20000300, "kfree\000", 6); *(uint32_t*)0x200006c8 = r[2]; syscall(__NR_bpf, /*cmd=*/0x11ul, /*arg=*/0x200006c0ul, /*size=*/0x10ul); } int main(void) { syscall(__NR_mmap, /*addr=*/0x1ffff000ul, /*len=*/0x1000ul, /*prot=*/0ul, /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul, /*fd=*/-1, /*offset=*/0ul); syscall(__NR_mmap, /*addr=*/0x20000000ul, /*len=*/0x1000000ul, /*prot=PROT_WRITE|PROT_READ|PROT_EXEC*/ 7ul, /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul, /*fd=*/-1, /*offset=*/0ul); syscall(__NR_mmap, /*addr=*/0x21000000ul, /*len=*/0x1000ul, /*prot=*/0ul, /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul, /*fd=*/-1, /*offset=*/0ul); loop(); return 0; }