// https://syzkaller.appspot.com/bug?id=016814f413b437ebf8d530b3775e620a892cf584 // 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 #include #include #include #include #include #include #include #ifndef __NR_bpf #define __NR_bpf 321 #endif 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 BITMASK(bf_off, bf_len) (((1ull << (bf_len)) - 1) << (bf_off)) #define STORE_BY_BITMASK(type, htobe, addr, val, bf_off, bf_len) \ *(type*)(addr) = \ htobe((htobe(*(type*)(addr)) & ~BITMASK((bf_off), (bf_len))) | \ (((type)(val) << (bf_off)) & BITMASK((bf_off), (bf_len)))) static bool write_file(const char* file, const char* what, ...) { char buf[1024]; va_list args; va_start(args, what); vsnprintf(buf, sizeof(buf), what, args); va_end(args); buf[sizeof(buf) - 1] = 0; int len = strlen(buf); int fd = open(file, O_WRONLY | O_CLOEXEC); if (fd == -1) return false; if (write(fd, buf, len) != len) { int err = errno; close(fd); errno = err; return false; } close(fd); return true; } #define MAX_FDS 30 static void setup_common() { if (mount(0, "/sys/fs/fuse/connections", "fusectl", 0, 0)) { } } static void setup_binderfs() { if (mkdir("/dev/binderfs", 0777)) { } if (mount("binder", "/dev/binderfs", "binder", 0, NULL)) { } if (symlink("/dev/binderfs", "./binderfs")) { } } static void loop(); static void sandbox_common() { prctl(PR_SET_PDEATHSIG, SIGKILL, 0, 0, 0); setsid(); struct rlimit rlim; rlim.rlim_cur = rlim.rlim_max = (200 << 20); setrlimit(RLIMIT_AS, &rlim); rlim.rlim_cur = rlim.rlim_max = 32 << 20; setrlimit(RLIMIT_MEMLOCK, &rlim); rlim.rlim_cur = rlim.rlim_max = 136 << 20; setrlimit(RLIMIT_FSIZE, &rlim); rlim.rlim_cur = rlim.rlim_max = 1 << 20; setrlimit(RLIMIT_STACK, &rlim); rlim.rlim_cur = rlim.rlim_max = 128 << 20; setrlimit(RLIMIT_CORE, &rlim); rlim.rlim_cur = rlim.rlim_max = 256; setrlimit(RLIMIT_NOFILE, &rlim); if (unshare(CLONE_NEWNS)) { } if (mount(NULL, "/", NULL, MS_REC | MS_PRIVATE, NULL)) { } if (unshare(CLONE_NEWIPC)) { } if (unshare(0x02000000)) { } if (unshare(CLONE_NEWUTS)) { } if (unshare(CLONE_SYSVSEM)) { } typedef struct { const char* name; const char* value; } sysctl_t; static const sysctl_t sysctls[] = { {"/proc/sys/kernel/shmmax", "16777216"}, {"/proc/sys/kernel/shmall", "536870912"}, {"/proc/sys/kernel/shmmni", "1024"}, {"/proc/sys/kernel/msgmax", "8192"}, {"/proc/sys/kernel/msgmni", "1024"}, {"/proc/sys/kernel/msgmnb", "1024"}, {"/proc/sys/kernel/sem", "1024 1048576 500 1024"}, }; unsigned i; for (i = 0; i < sizeof(sysctls) / sizeof(sysctls[0]); i++) write_file(sysctls[i].name, sysctls[i].value); } static int wait_for_loop(int pid) { if (pid < 0) exit(1); int status = 0; while (waitpid(-1, &status, __WALL) != pid) { } return WEXITSTATUS(status); } static void drop_caps(void) { struct __user_cap_header_struct cap_hdr = {}; struct __user_cap_data_struct cap_data[2] = {}; cap_hdr.version = _LINUX_CAPABILITY_VERSION_3; cap_hdr.pid = getpid(); if (syscall(SYS_capget, &cap_hdr, &cap_data)) exit(1); const int drop = (1 << CAP_SYS_PTRACE) | (1 << CAP_SYS_NICE); cap_data[0].effective &= ~drop; cap_data[0].permitted &= ~drop; cap_data[0].inheritable &= ~drop; if (syscall(SYS_capset, &cap_hdr, &cap_data)) exit(1); } static int do_sandbox_none(void) { if (unshare(CLONE_NEWPID)) { } int pid = fork(); if (pid != 0) return wait_for_loop(pid); setup_common(); sandbox_common(); drop_caps(); if (unshare(CLONE_NEWNET)) { } write_file("/proc/sys/net/ipv4/ping_group_range", "0 65535"); setup_binderfs(); loop(); exit(1); } static void kill_and_wait(int pid, int* status) { kill(-pid, SIGKILL); kill(pid, SIGKILL); for (int i = 0; i < 100; i++) { if (waitpid(-1, status, WNOHANG | __WALL) == pid) return; usleep(1000); } DIR* dir = opendir("/sys/fs/fuse/connections"); if (dir) { for (;;) { struct dirent* ent = readdir(dir); if (!ent) break; if (strcmp(ent->d_name, ".") == 0 || strcmp(ent->d_name, "..") == 0) continue; char abort[300]; snprintf(abort, sizeof(abort), "/sys/fs/fuse/connections/%s/abort", ent->d_name); int fd = open(abort, O_WRONLY); if (fd == -1) { continue; } if (write(fd, abort, 1) < 0) { } close(fd); } closedir(dir); } else { } while (waitpid(-1, status, __WALL) != pid) { } } static void setup_test() { prctl(PR_SET_PDEATHSIG, SIGKILL, 0, 0, 0); setpgrp(); write_file("/proc/self/oom_score_adj", "1000"); } static void close_fds() { for (int fd = 3; fd < MAX_FDS; fd++) close(fd); } #define USLEEP_FORKED_CHILD (3 * 50 * 1000) static long handle_clone_ret(long ret) { if (ret != 0) { return ret; } usleep(USLEEP_FORKED_CHILD); syscall(__NR_exit, 0); while (1) { } } static long syz_clone(volatile long flags, volatile long stack, volatile long stack_len, volatile long ptid, volatile long ctid, volatile long tls) { long sp = (stack + stack_len) & ~15; long ret = (long)syscall(__NR_clone, flags & ~CLONE_VM, sp, ptid, ctid, tls); return handle_clone_ret(ret); } static void execute_one(void); #define WAIT_FLAGS __WALL static void loop(void) { int iter = 0; for (;; iter++) { int pid = fork(); if (pid < 0) exit(1); if (pid == 0) { setup_test(); execute_one(); close_fds(); 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[7] = {0xffffffffffffffff, 0xffffffffffffffff, 0xffffffffffffffff, 0xffffffffffffffff, 0xffffffffffffffff, 0xffffffffffffffff, 0xffffffffffffffff}; void execute_one(void) { intptr_t res = 0; *(uint32_t*)0x20000200 = 0; *(uint32_t*)0x20000204 = 4; *(uint64_t*)0x20000208 = 0x200002c0; memcpy((void*)0x200002c0, "\x18\x01\x00\x00\x1f\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x85" "\x00\x00\x00\x6d\x00\x00\x00\x95", 25); *(uint64_t*)0x20000210 = 0; *(uint32_t*)0x20000218 = 0; *(uint32_t*)0x2000021c = 0; *(uint64_t*)0x20000220 = 0; *(uint32_t*)0x20000228 = 0; *(uint32_t*)0x2000022c = 0; memset((void*)0x20000230, 0, 16); *(uint32_t*)0x20000240 = 0; *(uint32_t*)0x20000244 = 2; *(uint32_t*)0x20000248 = -1; *(uint32_t*)0x2000024c = 8; *(uint64_t*)0x20000250 = 0; *(uint32_t*)0x20000258 = 0; *(uint32_t*)0x2000025c = 0x10; *(uint64_t*)0x20000260 = 0; *(uint32_t*)0x20000268 = 0; *(uint32_t*)0x2000026c = 0; *(uint32_t*)0x20000270 = 0; *(uint32_t*)0x20000274 = 0; *(uint64_t*)0x20000278 = 0; *(uint64_t*)0x20000280 = 0; *(uint32_t*)0x20000288 = 0x10; *(uint32_t*)0x2000028c = 0; syscall(__NR_bpf, /*cmd=*/5ul, /*arg=*/0x20000200ul, /*size=*/0xbful); *(uint32_t*)0x20000200 = 0x18; *(uint32_t*)0x20000204 = 4; *(uint64_t*)0x20000208 = 0x200002c0; *(uint64_t*)0x20000210 = 0x20000080; memcpy((void*)0x20000080, "GPL\000", 4); *(uint32_t*)0x20000218 = 0; *(uint32_t*)0x2000021c = 0; *(uint64_t*)0x20000220 = 0; *(uint32_t*)0x20000228 = 0; *(uint32_t*)0x2000022c = 0; memset((void*)0x20000230, 0, 16); *(uint32_t*)0x20000240 = 0; *(uint32_t*)0x20000244 = 2; *(uint32_t*)0x20000248 = -1; *(uint32_t*)0x2000024c = 8; *(uint64_t*)0x20000250 = 0; *(uint32_t*)0x20000258 = 0; *(uint32_t*)0x2000025c = 0x10; *(uint64_t*)0x20000260 = 0; *(uint32_t*)0x20000268 = 0; *(uint32_t*)0x2000026c = 0; *(uint32_t*)0x20000270 = 0; *(uint32_t*)0x20000274 = 0; *(uint64_t*)0x20000278 = 0; *(uint64_t*)0x20000280 = 0; *(uint32_t*)0x20000288 = 0x10; *(uint32_t*)0x2000028c = 0; res = syscall(__NR_bpf, /*cmd=*/5ul, /*arg=*/0x20000200ul, /*size=*/0x80ul); if (res != -1) r[0] = res; *(uint64_t*)0x20000040 = 0x20000000; memcpy((void*)0x20000000, "sys_enter\000", 10); *(uint32_t*)0x20000048 = r[0]; syscall(__NR_bpf, /*cmd=*/0x11ul, /*arg=*/0x20000040ul, /*size=*/0x10ul); res = syscall(__NR_socketpair, /*domain=*/1ul, /*type=*/2ul, /*proto=*/0, /*fds=*/0x20000100ul); if (res != -1) { r[1] = *(uint32_t*)0x20000100; r[2] = *(uint32_t*)0x20000104; } *(uint64_t*)0x20000400 = 0; *(uint32_t*)0x20000408 = 0xfffffd5f; *(uint64_t*)0x20000410 = 0; *(uint64_t*)0x20000418 = 0; *(uint64_t*)0x20000420 = 0; *(uint64_t*)0x20000428 = 0; *(uint32_t*)0x20000430 = 0; syscall(__NR_recvmsg, /*fd=*/r[1], /*msg=*/0x20000400ul, /*f=*/0ul, 0); *(uint64_t*)0x20000cc0 = 0; *(uint32_t*)0x20000cc8 = 0; *(uint64_t*)0x20000cd0 = 0; *(uint64_t*)0x20000cd8 = 0; *(uint64_t*)0x20000ce0 = 0; *(uint64_t*)0x20000ce8 = 0; *(uint32_t*)0x20000cf0 = 0; syscall(__NR_sendmsg, /*fd=*/r[2], /*msg=*/0x20000cc0ul, /*f=*/0ul); syscall(__NR_bpf, /*cmd=*/0ul, /*arg=*/0ul, /*size=*/0ul); syscall(__NR_bpf, /*cmd=*/5ul, /*arg=*/0ul, /*size=*/0ul); *(uint64_t*)0x20000340 = 0x20000300; memcpy((void*)0x20000300, "./file0\000", 8); *(uint32_t*)0x20000348 = 0; *(uint32_t*)0x2000034c = 0x10; *(uint32_t*)0x20000350 = -1; syscall(__NR_bpf, /*cmd=*/7ul, /*arg=*/0x20000340ul, /*size=*/0x18ul); syscall(__NR_bpf, /*cmd=*/5ul, /*arg=*/0ul, /*size=*/0ul); syscall(__NR_bpf, /*cmd=*/0xful, /*arg=*/0ul, /*size=*/0ul); syscall(__NR_perf_event_open, /*attr=*/0ul, /*pid=*/0, /*cpu=*/0ul, /*group=*/-1, /*flags=*/0ul); *(uint32_t*)0x20000740 = 1; *(uint32_t*)0x20000744 = 0x80; *(uint8_t*)0x20000748 = 0x74; *(uint8_t*)0x20000749 = 5; *(uint8_t*)0x2000074a = 0x8b; *(uint8_t*)0x2000074b = 0x2e; *(uint32_t*)0x2000074c = 0; *(uint64_t*)0x20000750 = 0x10000; *(uint64_t*)0x20000758 = 0x1ac; *(uint64_t*)0x20000760 = 8; STORE_BY_BITMASK(uint64_t, , 0x20000768, 0, 0, 1); STORE_BY_BITMASK(uint64_t, , 0x20000768, 0, 1, 1); STORE_BY_BITMASK(uint64_t, , 0x20000768, 1, 2, 1); STORE_BY_BITMASK(uint64_t, , 0x20000768, 1, 3, 1); STORE_BY_BITMASK(uint64_t, , 0x20000768, 1, 4, 1); STORE_BY_BITMASK(uint64_t, , 0x20000768, 0, 5, 1); STORE_BY_BITMASK(uint64_t, , 0x20000768, 0, 6, 1); STORE_BY_BITMASK(uint64_t, , 0x20000768, 0, 7, 1); STORE_BY_BITMASK(uint64_t, , 0x20000768, 0, 8, 1); STORE_BY_BITMASK(uint64_t, , 0x20000768, 1, 9, 1); STORE_BY_BITMASK(uint64_t, , 0x20000768, 0, 10, 1); STORE_BY_BITMASK(uint64_t, , 0x20000768, 0, 11, 1); STORE_BY_BITMASK(uint64_t, , 0x20000768, 1, 12, 1); STORE_BY_BITMASK(uint64_t, , 0x20000768, 0, 13, 1); STORE_BY_BITMASK(uint64_t, , 0x20000768, 0, 14, 1); STORE_BY_BITMASK(uint64_t, , 0x20000768, 2, 15, 2); STORE_BY_BITMASK(uint64_t, , 0x20000768, 1, 17, 1); STORE_BY_BITMASK(uint64_t, , 0x20000768, 0, 18, 1); STORE_BY_BITMASK(uint64_t, , 0x20000768, 1, 19, 1); STORE_BY_BITMASK(uint64_t, , 0x20000768, 0, 20, 1); STORE_BY_BITMASK(uint64_t, , 0x20000768, 0, 21, 1); STORE_BY_BITMASK(uint64_t, , 0x20000768, 0, 22, 1); STORE_BY_BITMASK(uint64_t, , 0x20000768, 0, 23, 1); STORE_BY_BITMASK(uint64_t, , 0x20000768, 0, 24, 1); STORE_BY_BITMASK(uint64_t, , 0x20000768, 1, 25, 1); STORE_BY_BITMASK(uint64_t, , 0x20000768, 0, 26, 1); STORE_BY_BITMASK(uint64_t, , 0x20000768, 1, 27, 1); STORE_BY_BITMASK(uint64_t, , 0x20000768, 0, 28, 1); STORE_BY_BITMASK(uint64_t, , 0x20000768, 1, 29, 1); STORE_BY_BITMASK(uint64_t, , 0x20000768, 0, 30, 1); STORE_BY_BITMASK(uint64_t, , 0x20000768, 0, 31, 1); STORE_BY_BITMASK(uint64_t, , 0x20000768, 1, 32, 1); STORE_BY_BITMASK(uint64_t, , 0x20000768, 0, 33, 1); STORE_BY_BITMASK(uint64_t, , 0x20000768, 0, 34, 1); STORE_BY_BITMASK(uint64_t, , 0x20000768, 1, 35, 1); STORE_BY_BITMASK(uint64_t, , 0x20000768, 0, 36, 1); STORE_BY_BITMASK(uint64_t, , 0x20000768, 1, 37, 1); STORE_BY_BITMASK(uint64_t, , 0x20000768, 0, 38, 26); *(uint32_t*)0x20000770 = 5; *(uint32_t*)0x20000774 = 1; *(uint64_t*)0x20000778 = 0x20000140; *(uint64_t*)0x20000780 = 0; *(uint64_t*)0x20000788 = 0x6000; *(uint64_t*)0x20000790 = 0x51; *(uint32_t*)0x20000798 = 7; *(uint32_t*)0x2000079c = 9; *(uint64_t*)0x200007a0 = 0xabc; *(uint32_t*)0x200007a8 = 0x4000000; *(uint16_t*)0x200007ac = -1; *(uint16_t*)0x200007ae = 0; *(uint32_t*)0x200007b0 = 1; *(uint32_t*)0x200007b4 = 0; *(uint64_t*)0x200007b8 = 0; syscall(__NR_perf_event_open, /*attr=*/0x20000740ul, /*pid=*/0, /*cpu=*/3ul, /*group=*/-1, /*flags=*/9ul); memcpy((void*)0x20000000, "./cgroup.cpu/syz0\000", 18); syscall(__NR_mkdirat, /*fd=*/0xffffffffffffff9cul, /*path=*/0x20000000ul, /*mode=*/0x1fful); syscall(__NR_openat, /*fd=*/0xffffffffffffff9cul, /*file=*/0x20000000ul, /*flags=*/0x200002ul, /*mode=*/0ul); memcpy((void*)0x20000180, "memory.events\000", 14); res = syscall(__NR_openat, /*fd=*/0xffffff9c, /*file=*/0x20000180ul, /*flags=*/0x26e1ul, /*mode=*/0ul); if (res != -1) r[3] = res; syscall(__NR_ioctl, /*fd=*/r[3], /*cmd=*/0x4030582a, /*period=*/0ul); *(uint32_t*)0x200005c0 = -1; *(uint32_t*)0x200005c4 = 3; *(uint32_t*)0x200005c8 = 8; res = syscall(__NR_bpf, /*cmd=*/0xeul, /*arg=*/0x200005c0ul, /*size=*/0xcul); if (res != -1) r[4] = res; syscall(__NR_bpf, /*cmd=*/5ul, /*arg=*/0ul, /*size=*/0ul); syscall(__NR_bpf, /*cmd=*/5ul, /*arg=*/0ul, /*size=*/0ul); res = syscall(__NR_openat, /*fd=*/0xffffff9c, /*file=*/0ul, /*flags=*/0x7a05ul, /*mode=*/0x1700ul); if (res != -1) r[5] = res; syscall(__NR_perf_event_open, /*attr=*/0ul, /*fd=*/r[5], /*cpu=*/0ul, /*group=*/-1, /*flags=*/2ul); *(uint32_t*)0x20000880 = -1; *(uint32_t*)0x20000884 = 2; *(uint32_t*)0x20000888 = 0x10; res = syscall(__NR_bpf, /*cmd=*/0xeul, /*arg=*/0x20000880ul, /*size=*/0xcul); if (res != -1) r[6] = res; *(uint32_t*)0x20000b80 = 7; *(uint32_t*)0x20000b84 = 0; *(uint64_t*)0x20000b88 = 0; *(uint64_t*)0x20000b90 = 0x20000380; memcpy((void*)0x20000380, "GPL\000", 4); *(uint32_t*)0x20000b98 = 0xb3; *(uint32_t*)0x20000b9c = 8; *(uint64_t*)0x20000ba0 = 0x20000700; *(uint32_t*)0x20000ba8 = 0x40f00; *(uint32_t*)0x20000bac = 2; memset((void*)0x20000bb0, 0, 16); *(uint32_t*)0x20000bc0 = 0; *(uint32_t*)0x20000bc4 = 4; *(uint32_t*)0x20000bc8 = r[3]; *(uint32_t*)0x20000bcc = 8; *(uint64_t*)0x20000bd0 = 0x20000800; *(uint32_t*)0x20000800 = 1; *(uint32_t*)0x20000804 = 3; *(uint32_t*)0x20000bd8 = 8; *(uint32_t*)0x20000bdc = 0x10; *(uint64_t*)0x20000be0 = 0x20000840; *(uint32_t*)0x20000840 = 2; *(uint32_t*)0x20000844 = 0; *(uint32_t*)0x20000848 = 3; *(uint32_t*)0x2000084c = 6; *(uint32_t*)0x20000be8 = 0x10; *(uint32_t*)0x20000bec = 0; *(uint32_t*)0x20000bf0 = -1; *(uint32_t*)0x20000bf4 = 4; *(uint64_t*)0x20000bf8 = 0x200009c0; *(uint32_t*)0x200009c0 = -1; *(uint32_t*)0x200009c4 = r[3]; *(uint32_t*)0x200009c8 = r[5]; *(uint32_t*)0x200009cc = r[4]; *(uint32_t*)0x200009d0 = r[6]; *(uint64_t*)0x20000c00 = 0x20000a80; *(uint32_t*)0x20000a80 = 4; *(uint32_t*)0x20000a84 = 5; *(uint32_t*)0x20000a88 = 5; *(uint32_t*)0x20000a8c = 8; *(uint32_t*)0x20000a90 = 4; *(uint32_t*)0x20000a94 = 5; *(uint32_t*)0x20000a98 = 8; *(uint32_t*)0x20000a9c = 8; *(uint32_t*)0x20000aa0 = 2; *(uint32_t*)0x20000aa4 = 4; *(uint32_t*)0x20000aa8 = 0; *(uint32_t*)0x20000aac = 0; *(uint32_t*)0x20000ab0 = 4; *(uint32_t*)0x20000ab4 = 3; *(uint32_t*)0x20000ab8 = 0xb; *(uint32_t*)0x20000abc = 4; *(uint32_t*)0x20000c08 = 0x10; *(uint32_t*)0x20000c0c = 7; syscall(__NR_bpf, /*cmd=*/5ul, /*arg=*/0x20000b80ul, /*size=*/0x90ul); syz_clone(/*flags=*/0x40242080, /*stack=*/0x20000a80, /*stack_len=*/0, /*parentid=*/0x20000b00, /*childtid=*/0, /*tls=*/0x20000b80); *(uint32_t*)0x20000040 = -1; syscall(__NR_bpf, /*cmd=*/0x22ul, /*arg=*/0x20000040ul, /*size=*/4ul); } int main(void) { syscall(__NR_mmap, /*addr=*/0x1ffff000ul, /*len=*/0x1000ul, /*prot=*/0ul, /*flags=*/0x32ul, /*fd=*/-1, /*offset=*/0ul); syscall(__NR_mmap, /*addr=*/0x20000000ul, /*len=*/0x1000000ul, /*prot=*/7ul, /*flags=*/0x32ul, /*fd=*/-1, /*offset=*/0ul); syscall(__NR_mmap, /*addr=*/0x21000000ul, /*len=*/0x1000ul, /*prot=*/0ul, /*flags=*/0x32ul, /*fd=*/-1, /*offset=*/0ul); do_sandbox_none(); return 0; }