// https://syzkaller.appspot.com/bug?id=d71f28b21dad3419f79cf010f30167620cb0cfff // 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 (;;) { sleep_ms(10); if (waitpid(-1, &status, WNOHANG | WAIT_FLAGS) == pid) break; if (current_time_ms() - start < 5000) continue; kill_and_wait(pid, &status); break; } } } uint64_t r[1] = {0xffffffffffffffff}; void execute_one(void) { intptr_t res = 0; if (write(1, "executing program\n", sizeof("executing program\n") - 1)) { } *(uint32_t*)0x200000000180 = 1; *(uint32_t*)0x200000000184 = 0x80; *(uint8_t*)0x200000000188 = 0; *(uint8_t*)0x200000000189 = 0; *(uint8_t*)0x20000000018a = 0; *(uint8_t*)0x20000000018b = 0; *(uint32_t*)0x20000000018c = 0; *(uint64_t*)0x200000000190 = 0x1ff; *(uint64_t*)0x200000000198 = 0; *(uint64_t*)0x2000000001a0 = 0; STORE_BY_BITMASK(uint64_t, , 0x2000000001a8, 0, 0, 1); STORE_BY_BITMASK(uint64_t, , 0x2000000001a8, 0, 1, 1); STORE_BY_BITMASK(uint64_t, , 0x2000000001a8, 0, 2, 1); STORE_BY_BITMASK(uint64_t, , 0x2000000001a8, 0, 3, 1); STORE_BY_BITMASK(uint64_t, , 0x2000000001a8, 0, 4, 1); STORE_BY_BITMASK(uint64_t, , 0x2000000001a8, 0, 5, 1); STORE_BY_BITMASK(uint64_t, , 0x2000000001a8, 0, 6, 1); STORE_BY_BITMASK(uint64_t, , 0x2000000001a8, 0, 7, 1); STORE_BY_BITMASK(uint64_t, , 0x2000000001a8, 0, 8, 1); STORE_BY_BITMASK(uint64_t, , 0x2000000001a8, 0, 9, 1); STORE_BY_BITMASK(uint64_t, , 0x2000000001a8, 0, 10, 1); STORE_BY_BITMASK(uint64_t, , 0x2000000001a8, 0, 11, 1); STORE_BY_BITMASK(uint64_t, , 0x2000000001a8, 0, 12, 1); STORE_BY_BITMASK(uint64_t, , 0x2000000001a8, 0, 13, 1); STORE_BY_BITMASK(uint64_t, , 0x2000000001a8, 0, 14, 1); STORE_BY_BITMASK(uint64_t, , 0x2000000001a8, 0, 15, 2); STORE_BY_BITMASK(uint64_t, , 0x2000000001a8, 0, 17, 1); STORE_BY_BITMASK(uint64_t, , 0x2000000001a8, 0, 18, 1); STORE_BY_BITMASK(uint64_t, , 0x2000000001a8, 0, 19, 1); STORE_BY_BITMASK(uint64_t, , 0x2000000001a8, 0, 20, 1); STORE_BY_BITMASK(uint64_t, , 0x2000000001a8, 0, 21, 1); STORE_BY_BITMASK(uint64_t, , 0x2000000001a8, 0, 22, 1); STORE_BY_BITMASK(uint64_t, , 0x2000000001a8, 0, 23, 1); STORE_BY_BITMASK(uint64_t, , 0x2000000001a8, 0, 24, 1); STORE_BY_BITMASK(uint64_t, , 0x2000000001a8, 0, 25, 1); STORE_BY_BITMASK(uint64_t, , 0x2000000001a8, 0, 26, 1); STORE_BY_BITMASK(uint64_t, , 0x2000000001a8, 0, 27, 1); STORE_BY_BITMASK(uint64_t, , 0x2000000001a8, 0, 28, 1); STORE_BY_BITMASK(uint64_t, , 0x2000000001a8, 0, 29, 1); STORE_BY_BITMASK(uint64_t, , 0x2000000001a8, 0, 30, 1); STORE_BY_BITMASK(uint64_t, , 0x2000000001a8, 0, 31, 1); STORE_BY_BITMASK(uint64_t, , 0x2000000001a8, 0, 32, 1); STORE_BY_BITMASK(uint64_t, , 0x2000000001a8, 0, 33, 1); STORE_BY_BITMASK(uint64_t, , 0x2000000001a8, 0, 34, 1); STORE_BY_BITMASK(uint64_t, , 0x2000000001a8, 0, 35, 1); STORE_BY_BITMASK(uint64_t, , 0x2000000001a8, 0, 36, 1); STORE_BY_BITMASK(uint64_t, , 0x2000000001a8, 0, 37, 1); STORE_BY_BITMASK(uint64_t, , 0x2000000001a8, 0, 38, 26); *(uint32_t*)0x2000000001b0 = 0; *(uint32_t*)0x2000000001b4 = 0; *(uint64_t*)0x2000000001b8 = 0x1ff; *(uint64_t*)0x2000000001c0 = 9; *(uint64_t*)0x2000000001c8 = 0; *(uint64_t*)0x2000000001d0 = 0; *(uint32_t*)0x2000000001d8 = 0; *(uint32_t*)0x2000000001dc = 0; *(uint64_t*)0x2000000001e0 = 0; *(uint32_t*)0x2000000001e8 = 0; *(uint16_t*)0x2000000001ec = 0; *(uint16_t*)0x2000000001ee = 0; *(uint32_t*)0x2000000001f0 = 0; *(uint32_t*)0x2000000001f4 = 0; *(uint64_t*)0x2000000001f8 = 0; res = syscall(__NR_perf_event_open, /*attr=*/0x200000000180ul, /*pid=*/0, /*cpu=*/0xaffffffffffffffful, /*group=*/(intptr_t)-1, /*flags=*/0ul); if (res != -1) r[0] = res; memcpy( (void*)0x2000000015c0, "\002;\345\b\000\034\234\000\000\000\000\000\000\221\354B\334Z\345\275$" "\005\220\251\363\307\313\267\360\241;#\2309\351\022\337^" "6T\337\315\002\305\260\272\022\'QXp\t\374\363\001\002\274\277\300\360" "\020\356\323\\yy\244\371\350\000\335\3517 " "0_\344]W\367~\254VK\311t\236+:\205\357\224\016\031\234V[N.\353\237J>" "\331\231\210\330\335\270Y\303$\306\223\v\004REY\0010\245`\337I\345b{" "\030z\242\350\311\336\352\364\352\362\315\315." "\026\2061\241\v\215\216\204R\246\203\204\300\001e\303\310\314?\310?" "\031\262\242\341\254<\351f\021\3773\307\031\236\031\365-" "\376\275\256\273R\202\026\371\025S\003U\340\330t\343%96", 198); syscall(__NR_ioctl, /*fd=*/r[0], /*cmd=*/0x5452, /*filter=*/0x2000000015c0ul); } int main(void) { syscall(__NR_mmap, /*addr=*/0x1ffffffff000ul, /*len=*/0x1000ul, /*prot=*/0ul, /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul, /*fd=*/(intptr_t)-1, /*offset=*/0ul); syscall(__NR_mmap, /*addr=*/0x200000000000ul, /*len=*/0x1000000ul, /*prot=PROT_WRITE|PROT_READ|PROT_EXEC*/ 7ul, /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul, /*fd=*/(intptr_t)-1, /*offset=*/0ul); syscall(__NR_mmap, /*addr=*/0x200001000000ul, /*len=*/0x1000ul, /*prot=*/0ul, /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul, /*fd=*/(intptr_t)-1, /*offset=*/0ul); const char* reason; (void)reason; loop(); return 0; }