// https://syzkaller.appspot.com/bug?id=4caf7e3d9132fde4550804ab6fb082d30494ec7f // 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 #ifndef SYS_ioctl #define SYS_ioctl 54 #endif #ifndef SYS_mknod #define SYS_mknod 450 #endif #ifndef SYS_mmap #define SYS_mmap 197 #endif #ifndef SYS_open #define SYS_open 5 #endif static unsigned long long procid; static void kill_and_wait(int pid, int* status) { kill(pid, SIGKILL); while (waitpid(-1, status, 0) != pid) { } } 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 void execute_one(void); #define WAIT_FLAGS 0 static void loop(void) { int iter = 0; for (;; iter++) { int pid = fork(); if (pid < 0) exit(1); if (pid == 0) { 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[1] = {0xffffffffffffffff}; void execute_one(void) { intptr_t res = 0; memcpy((void*)0x20000000, "./bus\000", 6); syscall(SYS_mknod, /*file=*/0x20000000ul, /*mode=*/0x3a0914c44f7b202dul, /*dev=*/0x504ul); memcpy((void*)0x20000100, "./bus\000", 6); res = syscall(SYS_open, /*file=*/0x20000100ul, /*flags=*/0x10005ul, /*mode=*/0ul); if (res != -1) r[0] = res; *(uint32_t*)0x20000000 = 5; syscall(SYS_ioctl, /*fd=*/r[0], /*cmd=*/0x8004741bul, /*arg=*/0x20000000ul); syscall(SYS_ioctl, /*fd=*/r[0], /*cmd=*/0x80047451ul, /*arg=*/0x20000100ul); } int main(void) { syscall(SYS_mmap, /*addr=*/0x20000000ul, /*len=*/0x1000000ul, /*prot=*/3ul, /*flags=*/0x1012ul, /*fd=*/-1, /*pad=*/0ul, /*offset=*/0ul); for (procid = 0; procid < 6; procid++) { if (fork() == 0) { loop(); } } sleep(1000000); return 0; }