// https://syzkaller.appspot.com/bug?id=e0aa8d33ddc5c05fb7d02e90d4270f972b91ed0c // 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 static unsigned long long procid; static __thread int clone_ongoing; static __thread int skip_segv; static __thread jmp_buf segv_env; static void segv_handler(int sig, siginfo_t* info, void* ctx) { if (__atomic_load_n(&clone_ongoing, __ATOMIC_RELAXED) != 0) { exit(sig); } uintptr_t addr = (uintptr_t)info->si_addr; const uintptr_t prog_start = 1 << 20; const uintptr_t prog_end = 100 << 20; int skip = __atomic_load_n(&skip_segv, __ATOMIC_RELAXED) != 0; int valid = addr < prog_start || addr > prog_end; if (skip && valid) { _longjmp(segv_env, 1); } exit(sig); } static void install_segv_handler(void) { struct sigaction sa; memset(&sa, 0, sizeof(sa)); sa.sa_sigaction = segv_handler; sa.sa_flags = SA_NODEFER | SA_SIGINFO; sigaction(SIGSEGV, &sa, NULL); sigaction(SIGBUS, &sa, NULL); } #define NONFAILING(...) \ ({ \ int ok = 1; \ __atomic_fetch_add(&skip_segv, 1, __ATOMIC_SEQ_CST); \ if (_setjmp(segv_env) == 0) { \ __VA_ARGS__; \ } else \ ok = 0; \ __atomic_fetch_sub(&skip_segv, 1, __ATOMIC_SEQ_CST); \ ok; \ }) 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; } #define __syscall syscall static void sandbox_common() { if (setsid() == -1) exit(1); struct rlimit rlim; rlim.rlim_cur = rlim.rlim_max = 8 << 20; setrlimit(RLIMIT_MEMLOCK, &rlim); rlim.rlim_cur = rlim.rlim_max = 1 << 20; setrlimit(RLIMIT_FSIZE, &rlim); rlim.rlim_cur = rlim.rlim_max = 1 << 20; setrlimit(RLIMIT_STACK, &rlim); rlim.rlim_cur = rlim.rlim_max = 0; setrlimit(RLIMIT_CORE, &rlim); rlim.rlim_cur = rlim.rlim_max = 256; setrlimit(RLIMIT_NOFILE, &rlim); } static void loop(); static int do_sandbox_none(void) { sandbox_common(); loop(); return 0; } 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[3] = {0xffffffffffffffff, 0xffffffffffffffff, 0xffffffffffffffff}; void execute_one(void) { intptr_t res = 0; NONFAILING(*(uint32_t*)0x20000000 = 0); NONFAILING(*(uint32_t*)0x20000004 = 0); NONFAILING(*(uint64_t*)0x20000008 = 0); NONFAILING(*(uint64_t*)0x20000010 = 0x10000000000001); syscall(SYS_ioctl, -1, 0x80185760ul, 0x20000000ul); NONFAILING(*(uint32_t*)0x200000c0 = 0); NONFAILING(*(uint32_t*)0x200000c4 = 0); NONFAILING(*(uint32_t*)0x200000c8 = -1); NONFAILING(*(uint32_t*)0x200000cc = 0); NONFAILING(memcpy((void*)0x200000d0, "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\xf2\xff\xff\xff" "\xff\xff\xff\xff\x40\x00", 20)); NONFAILING(*(uint32_t*)0x200000e4 = 0); NONFAILING(*(uint32_t*)0x200000e8 = 0); syscall(SYS_ioctl, -1, 0x802c7414ul, 0x200000c0ul); NONFAILING(*(uint16_t*)0x200000c0 = 0x18e6); NONFAILING(*(uint8_t*)0x200000c2 = 7); NONFAILING(*(uint32_t*)0x200000c4 = 0); syscall(SYS_connect, -1, 0x200000c0ul, 8ul); syscall(SYS_close, 0xffffff9c); NONFAILING(*(uint32_t*)0x20000140 = -1); NONFAILING(*(uint32_t*)0x20000144 = 0); NONFAILING(*(uint32_t*)0x20000148 = 0); NONFAILING(*(uint32_t*)0x2000014c = 0); NONFAILING(memcpy((void*)0x20000150, "\x01\x00\x00\x00\x00\x00\x00\x00\x00\xff\xff\xff\x7f\x00" "\x00\x00\x00\x00\x00\x00", 20)); NONFAILING(*(uint32_t*)0x20000164 = 0); NONFAILING(*(uint32_t*)0x20000168 = 0); syscall(SYS_ioctl, -1, 0x802c7416ul, 0x20000140ul); syscall(SYS_mprotect, 0x20000000ul, 0x800000ul, 5ul); res = syscall(SYS_socket, 0x18ul, 1ul, 0); if (res != -1) r[0] = res; NONFAILING(memcpy((void*)0x20000140, "\xeb\xff\xcb\xff\x13\xb9\xfd\x81\x2e\xaa\x4e\x71\x30\x48" "\xe6\x99\x31\x92\x96\x48", 20)); syscall(SYS_setsockopt, r[0], 0x29, 0xc, 0x20000140ul, 0x14ul); res = syscall(SYS_socket, 0x18ul, 1ul, 0); if (res != -1) r[1] = res; syscall(SYS_close, r[1]); res = syscall(SYS_socket, 0x18ul, 2ul, 0); if (res != -1) r[2] = res; syscall(SYS_close, r[2]); syscall(SYS_socket, 0x400000000018ul, 3ul, 0x3a); NONFAILING(memcpy((void*)0x20000000, "\xeb\xff\xcb\xff\x13\xb9\xfd\x81\x2e\xaa\x4e\x71\x30\x48" "\xe6\x99\x31\x92\x96\x48", 20)); syscall(SYS_setsockopt, r[2], 0x29, 0x2e, 0x20000000ul, 0x14ul); NONFAILING(*(uint16_t*)0x200000c0 = 0); NONFAILING(*(uint8_t*)0x200000c2 = 7); NONFAILING(*(uint32_t*)0x200000c4 = 0); syscall(SYS_connect, r[1], 0x200000c0ul, 0x1cul); NONFAILING(memcpy((void*)0x20000040, "\x10\x0a\x29\x56\xb9\x22\x37\x76", 8)); syscall(SYS_write, r[2], 0x20000040ul, 0x14aul); } int main(void) { syscall(SYS_mmap, 0x20000000ul, 0x1000000ul, 3ul, 0x1012ul, -1, 0ul); install_segv_handler(); for (procid = 0; procid < 8; procid++) { if (fork() == 0) { do_sandbox_none(); } } sleep(1000000); return 0; }