// https://syzkaller.appspot.com/bug?id=39dc1a2a4cf0a5afc3c5b2f0acb0c7e587b7f984 // 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 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; } } } #ifndef __NR_bpf #define __NR_bpf 321 #endif uint64_t r[1] = {0xffffffffffffffff}; void execute_one(void) { intptr_t res = 0; *(uint32_t*)0x20000180 = 1; *(uint32_t*)0x20000184 = 0x80; *(uint8_t*)0x20000188 = 0; *(uint8_t*)0x20000189 = 0; *(uint8_t*)0x2000018a = 0; *(uint8_t*)0x2000018b = 0; *(uint32_t*)0x2000018c = 0; *(uint64_t*)0x20000190 = 0x1ff; *(uint64_t*)0x20000198 = 0xc; *(uint64_t*)0x200001a0 = 0; STORE_BY_BITMASK(uint64_t, , 0x200001a8, 0, 0, 1); STORE_BY_BITMASK(uint64_t, , 0x200001a8, 0, 1, 1); STORE_BY_BITMASK(uint64_t, , 0x200001a8, 0, 2, 1); STORE_BY_BITMASK(uint64_t, , 0x200001a8, 0, 3, 1); STORE_BY_BITMASK(uint64_t, , 0x200001a8, 0, 4, 1); STORE_BY_BITMASK(uint64_t, , 0x200001a8, 0xbecb, 5, 1); STORE_BY_BITMASK(uint64_t, , 0x200001a8, 0, 6, 1); STORE_BY_BITMASK(uint64_t, , 0x200001a8, 0, 7, 1); STORE_BY_BITMASK(uint64_t, , 0x200001a8, 0, 8, 1); STORE_BY_BITMASK(uint64_t, , 0x200001a8, 0, 9, 1); STORE_BY_BITMASK(uint64_t, , 0x200001a8, 0, 10, 1); STORE_BY_BITMASK(uint64_t, , 0x200001a8, 0, 11, 1); STORE_BY_BITMASK(uint64_t, , 0x200001a8, 0, 12, 1); STORE_BY_BITMASK(uint64_t, , 0x200001a8, 0, 13, 1); STORE_BY_BITMASK(uint64_t, , 0x200001a8, 0, 14, 1); STORE_BY_BITMASK(uint64_t, , 0x200001a8, 0, 15, 2); STORE_BY_BITMASK(uint64_t, , 0x200001a8, 0, 17, 1); STORE_BY_BITMASK(uint64_t, , 0x200001a8, 0, 18, 1); STORE_BY_BITMASK(uint64_t, , 0x200001a8, 0, 19, 1); STORE_BY_BITMASK(uint64_t, , 0x200001a8, 0, 20, 1); STORE_BY_BITMASK(uint64_t, , 0x200001a8, 0, 21, 1); STORE_BY_BITMASK(uint64_t, , 0x200001a8, 0, 22, 1); STORE_BY_BITMASK(uint64_t, , 0x200001a8, 0, 23, 1); STORE_BY_BITMASK(uint64_t, , 0x200001a8, 0, 24, 1); STORE_BY_BITMASK(uint64_t, , 0x200001a8, 0, 25, 1); STORE_BY_BITMASK(uint64_t, , 0x200001a8, 0, 26, 1); STORE_BY_BITMASK(uint64_t, , 0x200001a8, 0, 27, 1); STORE_BY_BITMASK(uint64_t, , 0x200001a8, 0, 28, 1); STORE_BY_BITMASK(uint64_t, , 0x200001a8, 0, 29, 1); STORE_BY_BITMASK(uint64_t, , 0x200001a8, 0, 30, 1); STORE_BY_BITMASK(uint64_t, , 0x200001a8, 0, 31, 1); STORE_BY_BITMASK(uint64_t, , 0x200001a8, 0, 32, 1); STORE_BY_BITMASK(uint64_t, , 0x200001a8, 0, 33, 1); STORE_BY_BITMASK(uint64_t, , 0x200001a8, 0, 34, 1); STORE_BY_BITMASK(uint64_t, , 0x200001a8, 0, 35, 1); STORE_BY_BITMASK(uint64_t, , 0x200001a8, 0, 36, 1); STORE_BY_BITMASK(uint64_t, , 0x200001a8, 0, 37, 1); STORE_BY_BITMASK(uint64_t, , 0x200001a8, 0, 38, 26); *(uint32_t*)0x200001b0 = 0; *(uint32_t*)0x200001b4 = 0; *(uint64_t*)0x200001b8 = 0; *(uint64_t*)0x200001c0 = 0; *(uint64_t*)0x200001c8 = 0; *(uint64_t*)0x200001d0 = 0; *(uint32_t*)0x200001d8 = 0; *(uint32_t*)0x200001dc = 0; *(uint64_t*)0x200001e0 = 0; *(uint32_t*)0x200001e8 = 0; *(uint16_t*)0x200001ec = 0; *(uint16_t*)0x200001ee = 0; *(uint32_t*)0x200001f0 = 0; *(uint32_t*)0x200001f4 = 0; *(uint64_t*)0x200001f8 = 0; syscall(__NR_perf_event_open, 0x20000180ul, 0, -1ul, -1, 0ul); *(uint32_t*)0x20000400 = 9; *(uint32_t*)0x20000404 = 7; *(uint32_t*)0x20000408 = 8; *(uint32_t*)0x2000040c = 5; *(uint32_t*)0x20000410 = 0; *(uint32_t*)0x20000414 = -1; *(uint32_t*)0x20000418 = 0; memset((void*)0x2000041c, 0, 16); *(uint32_t*)0x2000042c = 0; *(uint32_t*)0x20000430 = -1; *(uint32_t*)0x20000434 = 0; *(uint32_t*)0x20000438 = 0; *(uint32_t*)0x2000043c = 0; res = syscall(__NR_bpf, 0ul, 0x20000400ul, 0x2cul); if (res != -1) r[0] = res; *(uint64_t*)0x20000480 = 0; *(uint64_t*)0x20000488 = 0; *(uint64_t*)0x20000490 = 0x20000800; *(uint64_t*)0x20000498 = 0x20001800; *(uint32_t*)0x200004a0 = 0xfffffffa; *(uint32_t*)0x200004a4 = r[0]; *(uint64_t*)0x200004a8 = 0; *(uint64_t*)0x200004b0 = 0; syscall(__NR_bpf, 0x1aul, 0x20000480ul, 0x38ul); } 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; }