// autogenerated by syzkaller (http://github.com/google/syzkaller) #ifndef __NR_bind #define __NR_bind 49 #endif #ifndef __NR_listen #define __NR_listen 50 #endif #ifndef __NR_syz_open_pts #define __NR_syz_open_pts 1000003 #endif #ifndef __NR_syz_test #define __NR_syz_test 1000001 #endif #ifndef __NR_mmap #define __NR_mmap 9 #endif #ifndef __NR_socket #define __NR_socket 41 #endif #ifndef __NR_connect #define __NR_connect 42 #endif #ifndef __NR_syz_fuse_mount #define __NR_syz_fuse_mount 1000004 #endif #ifndef __NR_syz_fuseblk_mount #define __NR_syz_fuseblk_mount 1000005 #endif #ifndef __NR_syz_open_dev #define __NR_syz_open_dev 1000002 #endif #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include __thread int skip_segv; __thread jmp_buf segv_env; static void segv_handler(int sig, siginfo_t* info, void* uctx) { if (__atomic_load_n(&skip_segv, __ATOMIC_RELAXED)) _longjmp(segv_env, 1); exit(sig); } static void install_segv_handler() { 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 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 uintptr_t syz_open_pts(uintptr_t a0, uintptr_t a1) { int ptyno = 0; if (ioctl(a0, TIOCGPTN, &ptyno)) return -1; char buf[128]; sprintf(buf, "/dev/pts/%d", ptyno); return open(buf, a1, 0); } static uintptr_t syz_fuse_mount(uintptr_t a0, uintptr_t a1, uintptr_t a2, uintptr_t a3, uintptr_t a4, uintptr_t a5) { uint64_t target = a0; uint64_t mode = a1; uint64_t uid = a2; uint64_t gid = a3; uint64_t maxread = a4; uint64_t flags = a5; int fd = open("/dev/fuse", O_RDWR); if (fd == -1) return fd; char buf[1024]; sprintf(buf, "fd=%d,user_id=%ld,group_id=%ld,rootmode=0%o", fd, (long)uid, (long)gid, (unsigned)mode & ~3u); if (maxread != 0) sprintf(buf + strlen(buf), ",max_read=%ld", (long)maxread); if (mode & 1) strcat(buf, ",default_permissions"); if (mode & 2) strcat(buf, ",allow_other"); syscall(SYS_mount, "", target, "fuse", flags, buf); return fd; } static uintptr_t syz_fuseblk_mount(uintptr_t a0, uintptr_t a1, uintptr_t a2, uintptr_t a3, uintptr_t a4, uintptr_t a5, uintptr_t a6, uintptr_t a7) { uint64_t target = a0; uint64_t blkdev = a1; uint64_t mode = a2; uint64_t uid = a3; uint64_t gid = a4; uint64_t maxread = a5; uint64_t blksize = a6; uint64_t flags = a7; int fd = open("/dev/fuse", O_RDWR); if (fd == -1) return fd; if (syscall(SYS_mknodat, AT_FDCWD, blkdev, S_IFBLK, makedev(7, 199))) return fd; char buf[256]; sprintf(buf, "fd=%d,user_id=%ld,group_id=%ld,rootmode=0%o", fd, (long)uid, (long)gid, (unsigned)mode & ~3u); if (maxread != 0) sprintf(buf + strlen(buf), ",max_read=%ld", (long)maxread); if (blksize != 0) sprintf(buf + strlen(buf), ",blksize=%ld", (long)blksize); if (mode & 1) strcat(buf, ",default_permissions"); if (mode & 2) strcat(buf, ",allow_other"); syscall(SYS_mount, blkdev, target, "fuseblk", flags, buf); return fd; } static uintptr_t execute_syscall(int nr, uintptr_t a0, uintptr_t a1, uintptr_t a2, uintptr_t a3, uintptr_t a4, uintptr_t a5, uintptr_t a6, uintptr_t a7, uintptr_t a8) { switch (nr) { default: return syscall(nr, a0, a1, a2, a3, a4, a5); case __NR_syz_test: return 0; case __NR_syz_open_dev: return syz_open_dev(a0, a1, a2); case __NR_syz_open_pts: return syz_open_pts(a0, a1); case __NR_syz_fuse_mount: return syz_fuse_mount(a0, a1, a2, a3, a4, a5); case __NR_syz_fuseblk_mount: return syz_fuseblk_mount(a0, a1, a2, a3, a4, a5, a6, a7); } } long r[28]; void* thr(void* arg) { switch ((long)arg) { case 0: r[0] = execute_syscall(__NR_mmap, 0x20000000ul, 0xe2b000ul, 0x3ul, 0x32ul, 0xfffffffffffffffful, 0x0ul, 0, 0, 0); break; case 1: r[1] = execute_syscall(__NR_socket, 0x2ul, 0x806ul, 0x0ul, 0, 0, 0, 0, 0, 0); break; case 2: NONFAILING(*(uint16_t*)0x204e8000 = (uint16_t)0x2); NONFAILING(*(uint16_t*)0x204e8002 = (uint16_t)0x4242); NONFAILING(*(uint32_t*)0x204e8004 = (uint32_t)0x0); NONFAILING(*(uint8_t*)0x204e8008 = (uint8_t)0x0); NONFAILING(*(uint8_t*)0x204e8009 = (uint8_t)0x0); NONFAILING(*(uint8_t*)0x204e800a = (uint8_t)0x0); NONFAILING(*(uint8_t*)0x204e800b = (uint8_t)0x0); NONFAILING(*(uint8_t*)0x204e800c = (uint8_t)0x0); NONFAILING(*(uint8_t*)0x204e800d = (uint8_t)0x0); NONFAILING(*(uint8_t*)0x204e800e = (uint8_t)0x0); NONFAILING(*(uint8_t*)0x204e800f = (uint8_t)0x0); r[13] = execute_syscall(__NR_bind, r[1], 0x204e8000ul, 0x10ul, 0, 0, 0, 0, 0, 0); break; case 3: r[14] = execute_syscall(__NR_listen, r[1], 0x1ul, 0, 0, 0, 0, 0, 0, 0); break; case 4: r[15] = execute_syscall(__NR_socket, 0x2ul, 0x6ul, 0x0ul, 0, 0, 0, 0, 0, 0); break; case 5: NONFAILING(*(uint16_t*)0x20e26000 = (uint16_t)0x2); NONFAILING(*(uint16_t*)0x20e26002 = (uint16_t)0x4242); NONFAILING(*(uint32_t*)0x20e26004 = (uint32_t)0x0); NONFAILING(*(uint8_t*)0x20e26008 = (uint8_t)0x0); NONFAILING(*(uint8_t*)0x20e26009 = (uint8_t)0x0); NONFAILING(*(uint8_t*)0x20e2600a = (uint8_t)0x0); NONFAILING(*(uint8_t*)0x20e2600b = (uint8_t)0x0); NONFAILING(*(uint8_t*)0x20e2600c = (uint8_t)0x0); NONFAILING(*(uint8_t*)0x20e2600d = (uint8_t)0x0); NONFAILING(*(uint8_t*)0x20e2600e = (uint8_t)0x0); NONFAILING(*(uint8_t*)0x20e2600f = (uint8_t)0x0); r[27] = execute_syscall(__NR_connect, r[15], 0x20e26000ul, 0x10ul, 0, 0, 0, 0, 0, 0); break; } return 0; } int main() { long i; pthread_t th[12]; install_segv_handler(); memset(r, -1, sizeof(r)); srand(getpid()); for (i = 0; i < 6; i++) { pthread_create(&th[i], 0, thr, (void*)i); usleep(10000); } for (i = 0; i < 6; i++) { pthread_create(&th[6 + i], 0, thr, (void*)i); if (rand() % 2) usleep(rand() % 10000); } usleep(100000); return 0; }