// https://syzkaller.appspot.com/bug?id=898819aa10260a468a0191c309b066cc36437d7d // autogenerated by syzkaller (http://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 __attribute__((noreturn)) static void doexit(int status) { volatile unsigned i; syscall(__NR_exit_group, status); for (i = 0;; i++) { } } #include #include const int kFailStatus = 67; const int kRetryStatus = 69; static void fail(const char* msg, ...) { int e = errno; va_list args; va_start(args, msg); vfprintf(stderr, msg, args); va_end(args); fprintf(stderr, " (errno %d)\n", e); doexit((e == ENOMEM || e == EAGAIN) ? kRetryStatus : kFailStatus); } static uint64_t current_time_ms() { struct timespec ts; if (clock_gettime(CLOCK_MONOTONIC, &ts)) fail("clock_gettime failed"); return (uint64_t)ts.tv_sec * 1000 + (uint64_t)ts.tv_nsec / 1000000; } static uintptr_t syz_open_procfs(uintptr_t a0, uintptr_t a1) { char buf[128]; memset(buf, 0, sizeof(buf)); if (a0 == 0) { snprintf(buf, sizeof(buf), "/proc/self/%s", (char*)a1); } else if (a0 == (uintptr_t)-1) { snprintf(buf, sizeof(buf), "/proc/thread-self/%s", (char*)a1); } else { snprintf(buf, sizeof(buf), "/proc/self/task/%d/%s", (int)a0, (char*)a1); } int fd = open(buf, O_RDWR); if (fd == -1) fd = open(buf, O_RDONLY); return fd; } static void test(); void loop() { int iter; for (iter = 0;; iter++) { int pid = fork(); if (pid < 0) fail("loop fork failed"); if (pid == 0) { prctl(PR_SET_PDEATHSIG, SIGKILL, 0, 0, 0); setpgrp(); test(); doexit(0); } int status = 0; uint64_t start = current_time_ms(); for (;;) { int res = waitpid(-1, &status, __WALL | WNOHANG); if (res == pid) break; usleep(1000); if (current_time_ms() - start > 5 * 1000) { kill(-pid, SIGKILL); kill(pid, SIGKILL); while (waitpid(-1, &status, __WALL) != pid) { } break; } } } } struct thread_t { int created, running, call; pthread_t th; }; static struct thread_t threads[16]; static void execute_call(int call); static int running; static void* thr(void* arg) { struct thread_t* th = (struct thread_t*)arg; for (;;) { while (!__atomic_load_n(&th->running, __ATOMIC_ACQUIRE)) syscall(SYS_futex, &th->running, FUTEX_WAIT, 0, 0); execute_call(th->call); __atomic_fetch_sub(&running, 1, __ATOMIC_RELAXED); __atomic_store_n(&th->running, 0, __ATOMIC_RELEASE); syscall(SYS_futex, &th->running, FUTEX_WAKE); } return 0; } static void execute(int num_calls) { int call, thread; running = 0; for (call = 0; call < num_calls; call++) { for (thread = 0; thread < sizeof(threads) / sizeof(threads[0]); thread++) { struct thread_t* th = &threads[thread]; if (!th->created) { th->created = 1; pthread_attr_t attr; pthread_attr_init(&attr); pthread_attr_setstacksize(&attr, 128 << 10); pthread_create(&th->th, &attr, thr, th); } if (!__atomic_load_n(&th->running, __ATOMIC_ACQUIRE)) { th->call = call; __atomic_fetch_add(&running, 1, __ATOMIC_RELAXED); __atomic_store_n(&th->running, 1, __ATOMIC_RELEASE); syscall(SYS_futex, &th->running, FUTEX_WAKE); struct timespec ts; ts.tv_sec = 0; ts.tv_nsec = 20 * 1000 * 1000; syscall(SYS_futex, &th->running, FUTEX_WAIT, 1, &ts); if (running) usleep((call == num_calls - 1) ? 10000 : 1000); break; } } } } #ifndef __NR_openat #define __NR_openat 295 #endif #ifndef __NR_splice #define __NR_splice 313 #endif #ifndef __NR_mmap #define __NR_mmap 192 #endif #ifndef __NR_mknod #define __NR_mknod 14 #endif #ifndef __NR_readv #define __NR_readv 145 #endif #ifndef __NR_pipe2 #define __NR_pipe2 331 #endif #ifndef __NR_clone #define __NR_clone 120 #endif #ifndef __NR_execve #define __NR_execve 11 #endif #undef __NR_mmap #define __NR_mmap __NR_mmap2 long r[3]; void execute_call(int call) { switch (call) { case 0: syscall(__NR_mmap, 0x20000000, 0xfff000, 0x3, 0x32, 0xffffffff, 0x0); break; case 1: syscall(__NR_clone, 0x200, 0x20fbf000, 0x20744000, 0x20f8b000, 0x200d5000); break; case 2: memcpy((void*)0x20f80000, "./file0", 8); syscall(__NR_mknod, 0x20f80000, 0x1040, 0x0); break; case 3: memcpy((void*)0x20f8aff8, "./file0", 8); syscall(__NR_execve, 0x20f8aff8, 0x20a7bfc8, 0x206fcff0); break; case 4: memcpy((void*)0x20aa1000, "syscall", 8); r[0] = syz_open_procfs(0x0, 0x20aa1000); break; case 5: *(uint32_t*)0x205f0f90 = 0x2099b000; *(uint32_t*)0x205f0f94 = 0x52; syscall(__NR_readv, r[0], 0x205f0f90, 0x1); break; case 6: memcpy((void*)0x20000feb, "/proc/self/net/pfkey", 21); r[1] = syscall(__NR_openat, 0xffffff9c, 0x20000feb, 0x0, 0x0); break; case 7: if (syscall(__NR_pipe2, 0x20001ff8, 0x0) != -1) { r[2] = *(uint32_t*)0x20001ffc; } break; case 8: syscall(__NR_splice, r[1], 0x0, r[2], 0x0, 0x4, 0x0); break; } } void test() { memset(r, -1, sizeof(r)); execute(9); } int main() { loop(); return 0; }