// https://syzkaller.appspot.com/bug?id=f766e5c6b61f80f26829d370bacb752b929d1777 // 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 __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 uintptr_t syz_open_dev(uintptr_t a0, uintptr_t a1, uintptr_t a2) { if (a0 == 0xc || a0 == 0xb) { char buf[128]; sprintf(buf, "/dev/%s/%d:%d", a0 == 0xc ? "char" : "block", (uint8_t)a1, (uint8_t)a2); return open(buf, O_RDWR, 0); } else { char buf[1024]; char* hash; strncpy(buf, (char*)a0, sizeof(buf)); buf[sizeof(buf) - 1] = 0; while ((hash = strchr(buf, '#'))) { *hash = '0' + (char)(a1 % 10); a1 /= 10; } return open(buf, a2, 0); } } static void loop(); static void sandbox_common() { prctl(PR_SET_PDEATHSIG, SIGKILL, 0, 0, 0); setpgrp(); setsid(); struct rlimit rlim; rlim.rlim_cur = rlim.rlim_max = 128 << 20; setrlimit(RLIMIT_AS, &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); #define CLONE_NEWCGROUP 0x02000000 unshare(CLONE_NEWNS); unshare(CLONE_NEWIPC); unshare(CLONE_NEWCGROUP); unshare(CLONE_NEWNET); unshare(CLONE_NEWUTS); unshare(CLONE_SYSVSEM); } static int do_sandbox_none(int executor_pid, bool enable_tun) { unshare(CLONE_NEWPID); int pid = fork(); if (pid < 0) fail("sandbox fork failed"); if (pid) return pid; sandbox_common(); loop(); doexit(1); } #ifndef __NR_socket #define __NR_socket 359 #endif #ifndef __NR_ioctl #define __NR_ioctl 54 #endif #ifndef __NR_write #define __NR_write 4 #endif #ifndef __NR_mmap #define __NR_mmap 192 #endif #undef __NR_mmap #define __NR_mmap __NR_mmap2 long r[2]; void loop() { memset(r, -1, sizeof(r)); syscall(__NR_mmap, 0x20000000, 0xfff000, 3, 0x32, -1, 0); r[0] = syscall(__NR_socket, 2, 1, 0); memcpy((void*)0x20a9dff3, "/dev/net/tun", 13); r[1] = syz_open_dev(0x20a9dff3, 0, 2); memcpy((void*)0x20f32000, "\x65\x71\x6c\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00", 16); *(uint32_t*)0x20f32010 = 9; *(uint32_t*)0x20f32014 = 0; *(uint32_t*)0x20f32018 = 0x2042ffe8; *(uint32_t*)0x2042ffe8 = 0; *(uint32_t*)0x2042ffec = 0; *(uint32_t*)0x2042fff0 = 0; *(uint32_t*)0x2042fff4 = 0; *(uint32_t*)0x2042fff8 = 0; *(uint16_t*)0x2042fffc = 0; *(uint16_t*)0x2042fffe = 0; syscall(__NR_ioctl, r[1], 0x400454ca, 0x20f32000); memcpy((void*)0x20fd8fe0, "\x65\x71\x6c\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00", 16); *(uint16_t*)0x20fd8ff0 = 0x301; syscall(__NR_ioctl, r[0], 0x8914, 0x20fd8fe0); *(uint16_t*)0x20b61fd2 = 0; *(uint16_t*)0x20b61fd4 = htobe16(0xc); *(uint8_t*)0x20b61fd6 = 0; *(uint8_t*)0x20b61fd7 = 0; *(uint8_t*)0x20b61fd8 = 0; *(uint8_t*)0x20b61fd9 = 0; *(uint8_t*)0x20b61fda = 0; *(uint8_t*)0x20b61fdb = 0; *(uint8_t*)0x20b61fdc = 0xaa; *(uint8_t*)0x20b61fdd = 0xaa; *(uint8_t*)0x20b61fde = 0xaa; *(uint8_t*)0x20b61fdf = 0xaa; *(uint8_t*)0x20b61fe0 = 0; *(uint8_t*)0x20b61fe1 = 0xbb; *(uint16_t*)0x20b61fe2 = htobe16(0x806); *(uint16_t*)0x20b61fe4 = htobe16(1); *(uint16_t*)0x20b61fe6 = htobe16(0x800); *(uint8_t*)0x20b61fe8 = 6; *(uint8_t*)0x20b61fe9 = 4; *(uint16_t*)0x20b61fea = htobe16(0xb); *(uint8_t*)0x20b61fec = 0xaa; *(uint8_t*)0x20b61fed = 0xaa; *(uint8_t*)0x20b61fee = 0xaa; *(uint8_t*)0x20b61fef = 0xaa; *(uint8_t*)0x20b61ff0 = 0; *(uint8_t*)0x20b61ff1 = 0xbb; *(uint32_t*)0x20b61ff2 = htobe32(3); *(uint8_t*)0x20b61ff6 = 0xaa; *(uint8_t*)0x20b61ff7 = 0xaa; *(uint8_t*)0x20b61ff8 = 0xaa; *(uint8_t*)0x20b61ff9 = 0xaa; *(uint8_t*)0x20b61ffa = 0; *(uint8_t*)0x20b61ffb = 0x10; *(uint32_t*)0x20b61ffc = htobe32(-1); syscall(__NR_write, r[1], 0x20b61fd2, 0x2e); } int main() { int pid = do_sandbox_none(0, false); int status = 0; while (waitpid(pid, &status, __WALL) != pid) { } return 0; }