// https://syzkaller.appspot.com/bug?id=41dd0f37ca3e89882ecbf2c51f1741204b8fbd56 // 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 static unsigned long long procid; static __thread int skip_segv; static __thread jmp_buf segv_env; static void segv_handler(int sig, siginfo_t* info, void* ctx) { 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 (sig == SIGBUS) { valid = 1; } 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(...) \ { \ __atomic_fetch_add(&skip_segv, 1, __ATOMIC_SEQ_CST); \ if (_setjmp(segv_env) == 0) { \ __VA_ARGS__; \ } \ __atomic_fetch_sub(&skip_segv, 1, __ATOMIC_SEQ_CST); \ } 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 < 5 * 1000) continue; kill_and_wait(pid, &status); break; } } } uint64_t r[1] = {0xffffffffffffffff}; void execute_one(void) { intptr_t res = 0; res = syscall(SYS_socket, 0x1c, 1, 0x84); if (res != -1) r[0] = res; NONFAILING(*(uint32_t*)0x10000600 = 0); NONFAILING(*(uint32_t*)0x10000604 = 7); syscall(SYS_setsockopt, (intptr_t)r[0], 0x84, 0xe, 0x10000600, 8); NONFAILING(*(uint8_t*)0x10000000 = 0x1c); NONFAILING(*(uint8_t*)0x10000001 = 0x1c); NONFAILING(*(uint16_t*)0x10000002 = htobe16(0x4e22 + procid * 4)); NONFAILING(*(uint32_t*)0x10000004 = 0); NONFAILING(*(uint8_t*)0x10000008 = 0); NONFAILING(*(uint8_t*)0x10000009 = 0); NONFAILING(*(uint8_t*)0x1000000a = 0); NONFAILING(*(uint8_t*)0x1000000b = 0); NONFAILING(*(uint8_t*)0x1000000c = 0); NONFAILING(*(uint8_t*)0x1000000d = 0); NONFAILING(*(uint8_t*)0x1000000e = 0); NONFAILING(*(uint8_t*)0x1000000f = 0); NONFAILING(*(uint8_t*)0x10000010 = 0); NONFAILING(*(uint8_t*)0x10000011 = 0); NONFAILING(*(uint8_t*)0x10000012 = 0); NONFAILING(*(uint8_t*)0x10000013 = 0); NONFAILING(*(uint8_t*)0x10000014 = 0); NONFAILING(*(uint8_t*)0x10000015 = 0); NONFAILING(*(uint8_t*)0x10000016 = 0); NONFAILING(*(uint8_t*)0x10000017 = 0); NONFAILING(*(uint32_t*)0x10000018 = 0); syscall(SYS_bind, (intptr_t)r[0], 0x10000000, 0x1c); NONFAILING(*(uint8_t*)0x10000180 = 0x5f); NONFAILING(*(uint8_t*)0x10000181 = 0x1c); NONFAILING(*(uint16_t*)0x10000182 = htobe16(0x4e22 + procid * 4)); NONFAILING(*(uint32_t*)0x10000184 = 0); NONFAILING(*(uint64_t*)0x10000188 = htobe64(0)); NONFAILING(*(uint64_t*)0x10000190 = htobe64(1)); NONFAILING(*(uint32_t*)0x10000198 = 0); syscall(SYS_connect, (intptr_t)r[0], 0x10000180, 0x1c); syscall(SYS_shutdown, (intptr_t)r[0], 0); NONFAILING(*(uint32_t*)0x100005c0 = 0); NONFAILING(*(uint32_t*)0x100005c4 = 0); NONFAILING(*(uint32_t*)0x100005c8 = 0x10000280); NONFAILING(*(uint32_t*)0x10000280 = 0x10000080); NONFAILING(memcpy( (void*)0x10000080, "\x40\x88\x10\x77\xb1\x7b\x84\x77\x51\x6b\xec\x66\xc1\xed\x57\xf9\x19\x22" "\x81\xf9\x1f\xec\x78\xeb\x36\x4b\xc8\x6e\x26\x1b\x06\x13\x6c\x16\xd6\xb8" "\xae\xc9\x19\x80\x18\xe2\x36\x35\x05\x7d\x40\x18\xdc\x61\x6d\x7f\x09\xf7" "\x57\x79\x6e\x11\xf7\xd3\x7c\x6e\xf6\x92\xaa\x28\xb6\xa0\x06\x8b\xc7\xf2" "\xba\xf2\x7f\xc5\x73\xb4\xba\xf2\x06\xaa\x00\x3b\xf7\xcc\x83\xcb\x51\x1f" "\x89\x29\x86\xf4\x24\x00\x3a\x53\x7a\xc8\xee\xa7\xdf\x44\xb4\x69\xdb\xbe" "\x43\xee\x78\x02\x9b\xcc\x07\x54\x92\x73\xe4\x1d\x78\xc7\xdd\x51\x80\x2e" "\xbb\x46\x3a\xf3\x2e\xf6\xf3\x62\x3c\x10\x01\xa7\xa3\xcc\x5c\x4a\x46\x7d" "\x97\x24\x75\xfe\x4e\xdc\x64\x74\x89", 153)); NONFAILING(*(uint32_t*)0x10000284 = 0x99); NONFAILING(*(uint32_t*)0x100005cc = 1); NONFAILING(*(uint32_t*)0x100005d0 = 0); NONFAILING(*(uint32_t*)0x100005d4 = 0x2e8); NONFAILING(*(uint32_t*)0x100005d8 = 0); syscall(SYS_sendmsg, (intptr_t)r[0], 0x100005c0, 0); } int main(void) { syscall(SYS_mmap, 0x10000000, 0x1000000, 7, 0x1012, -1, 0); install_segv_handler(); for (procid = 0; procid < 4; procid++) { if (fork() == 0) { loop(); } } sleep(1000000); return 0; }