| // KASAN: stack-out-of-bounds Read in unwind_next_frame |
| // https://syzkaller.appspot.com/bug?id=98e21104338e0ccf8f214bb5f8872a79820a8eea |
| // status:dup |
| // autogenerated by syzkaller (http://github.com/google/syzkaller) |
| |
| #define _GNU_SOURCE |
| #include <dirent.h> |
| #include <endian.h> |
| #include <errno.h> |
| #include <errno.h> |
| #include <errno.h> |
| #include <fcntl.h> |
| #include <linux/futex.h> |
| #include <pthread.h> |
| #include <sched.h> |
| #include <signal.h> |
| #include <signal.h> |
| #include <stdarg.h> |
| #include <stdarg.h> |
| #include <stdbool.h> |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <sys/mount.h> |
| #include <sys/mount.h> |
| #include <sys/prctl.h> |
| #include <sys/prctl.h> |
| #include <sys/resource.h> |
| #include <sys/stat.h> |
| #include <sys/syscall.h> |
| #include <sys/time.h> |
| #include <sys/time.h> |
| #include <sys/types.h> |
| #include <sys/wait.h> |
| #include <sys/wait.h> |
| #include <time.h> |
| #include <unistd.h> |
| |
| __attribute__((noreturn)) static void doexit(int status) |
| { |
| volatile unsigned i; |
| syscall(__NR_exit_group, status); |
| for (i = 0;; i++) { |
| } |
| } |
| #include <errno.h> |
| #include <stdarg.h> |
| #include <stdint.h> |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <string.h> |
| #include <sys/stat.h> |
| |
| 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 void exitf(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(kRetryStatus); |
| } |
| |
| #define BITMASK_LEN(type, bf_len) (type)((1ull << (bf_len)) - 1) |
| |
| #define BITMASK_LEN_OFF(type, bf_off, bf_len) \ |
| (type)(BITMASK_LEN(type, (bf_len)) << (bf_off)) |
| |
| #define STORE_BY_BITMASK(type, addr, val, bf_off, bf_len) \ |
| if ((bf_off) == 0 && (bf_len) == 0) { \ |
| *(type*)(addr) = (type)(val); \ |
| } else { \ |
| type new_val = *(type*)(addr); \ |
| new_val &= ~BITMASK_LEN_OFF(type, (bf_off), (bf_len)); \ |
| new_val |= ((type)(val)&BITMASK_LEN(type, (bf_len))) << (bf_off); \ |
| *(type*)(addr) = new_val; \ |
| } |
| |
| static uint64_t current_time_ms() |
| { |
| struct timespec ts; |
| |
| if (clock_gettime(CLOCK_MONOTONIC, &ts)) |
| fail("clock_gettime failed"); |
| return (uint64_t)ts.tv_sec * 1000 + (uint64_t)ts.tv_nsec / 1000000; |
| } |
| |
| static void use_temporary_dir() |
| { |
| char tmpdir_template[] = "./syzkaller.XXXXXX"; |
| char* tmpdir = mkdtemp(tmpdir_template); |
| if (!tmpdir) |
| fail("failed to mkdtemp"); |
| if (chmod(tmpdir, 0777)) |
| fail("failed to chmod"); |
| if (chdir(tmpdir)) |
| fail("failed to chdir"); |
| } |
| |
| 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; |
| } |
| |
| static void setup_cgroups() |
| { |
| if (mkdir("/syzcgroup", 0777)) { |
| } |
| if (mkdir("/syzcgroup/unified", 0777)) { |
| } |
| if (mount("none", "/syzcgroup/unified", "cgroup2", 0, NULL)) { |
| } |
| if (chmod("/syzcgroup/unified", 0777)) { |
| } |
| if (!write_file("/syzcgroup/unified/cgroup.subtree_control", |
| "+cpu +memory +io +pids +rdma")) { |
| } |
| if (mkdir("/syzcgroup/cpu", 0777)) { |
| } |
| if (mount("none", "/syzcgroup/cpu", "cgroup", 0, |
| "cpuset,cpuacct,perf_event,hugetlb")) { |
| } |
| if (!write_file("/syzcgroup/cpu/cgroup.clone_children", "1")) { |
| } |
| if (chmod("/syzcgroup/cpu", 0777)) { |
| } |
| if (mkdir("/syzcgroup/net", 0777)) { |
| } |
| if (mount("none", "/syzcgroup/net", "cgroup", 0, |
| "net_cls,net_prio,devices,freezer")) { |
| } |
| if (chmod("/syzcgroup/net", 0777)) { |
| } |
| } |
| |
| static void setup_binfmt_misc() |
| { |
| if (!write_file("/proc/sys/fs/binfmt_misc/register", |
| ":syz0:M:0:syz0::./file0:")) { |
| } |
| if (!write_file("/proc/sys/fs/binfmt_misc/register", |
| ":syz1:M:1:yz1::./file0:POC")) { |
| } |
| } |
| |
| 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 = 160 << 20; |
| setrlimit(RLIMIT_AS, &rlim); |
| rlim.rlim_cur = rlim.rlim_max = 8 << 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 = 0; |
| setrlimit(RLIMIT_CORE, &rlim); |
| |
| if (unshare(CLONE_NEWNS)) { |
| } |
| if (unshare(CLONE_NEWIPC)) { |
| } |
| if (unshare(0x02000000)) { |
| } |
| if (unshare(CLONE_NEWUTS)) { |
| } |
| if (unshare(CLONE_SYSVSEM)) { |
| } |
| } |
| |
| int wait_for_loop(int pid) |
| { |
| if (pid < 0) |
| fail("sandbox fork failed"); |
| int status = 0; |
| while (waitpid(-1, &status, __WALL) != pid) { |
| } |
| return WEXITSTATUS(status); |
| } |
| |
| static int do_sandbox_none(void) |
| { |
| if (unshare(CLONE_NEWPID)) { |
| } |
| int pid = fork(); |
| if (pid != 0) |
| return wait_for_loop(pid); |
| |
| setup_cgroups(); |
| setup_binfmt_misc(); |
| sandbox_common(); |
| if (unshare(CLONE_NEWNET)) { |
| } |
| loop(); |
| doexit(1); |
| } |
| |
| static void remove_dir(const char* dir) |
| { |
| DIR* dp; |
| struct dirent* ep; |
| int iter = 0; |
| retry: |
| while (umount2(dir, MNT_DETACH) == 0) { |
| } |
| dp = opendir(dir); |
| if (dp == NULL) { |
| if (errno == EMFILE) { |
| exitf("opendir(%s) failed due to NOFILE, exiting", dir); |
| } |
| exitf("opendir(%s) failed", dir); |
| } |
| while ((ep = readdir(dp))) { |
| if (strcmp(ep->d_name, ".") == 0 || strcmp(ep->d_name, "..") == 0) |
| continue; |
| char filename[FILENAME_MAX]; |
| snprintf(filename, sizeof(filename), "%s/%s", dir, ep->d_name); |
| while (umount2(filename, MNT_DETACH) == 0) { |
| } |
| struct stat st; |
| if (lstat(filename, &st)) |
| exitf("lstat(%s) failed", filename); |
| if (S_ISDIR(st.st_mode)) { |
| remove_dir(filename); |
| continue; |
| } |
| int i; |
| for (i = 0;; i++) { |
| if (unlink(filename) == 0) |
| break; |
| if (errno == EROFS) { |
| break; |
| } |
| if (errno != EBUSY || i > 100) |
| exitf("unlink(%s) failed", filename); |
| if (umount2(filename, MNT_DETACH)) |
| exitf("umount(%s) failed", filename); |
| } |
| } |
| closedir(dp); |
| int i; |
| for (i = 0;; i++) { |
| if (rmdir(dir) == 0) |
| break; |
| if (i < 100) { |
| if (errno == EROFS) { |
| break; |
| } |
| if (errno == EBUSY) { |
| if (umount2(dir, MNT_DETACH)) |
| exitf("umount(%s) failed", dir); |
| continue; |
| } |
| if (errno == ENOTEMPTY) { |
| if (iter < 100) { |
| iter++; |
| goto retry; |
| } |
| } |
| } |
| exitf("rmdir(%s) failed", dir); |
| } |
| } |
| |
| static void execute_one(); |
| extern unsigned long long procid; |
| |
| static void loop() |
| { |
| char cgroupdir[64]; |
| snprintf(cgroupdir, sizeof(cgroupdir), "/syzcgroup/unified/syz%llu", procid); |
| char cgroupdir_cpu[64]; |
| snprintf(cgroupdir_cpu, sizeof(cgroupdir_cpu), "/syzcgroup/cpu/syz%llu", |
| procid); |
| char cgroupdir_net[64]; |
| snprintf(cgroupdir_net, sizeof(cgroupdir_net), "/syzcgroup/net/syz%llu", |
| procid); |
| if (mkdir(cgroupdir, 0777)) { |
| } |
| if (mkdir(cgroupdir_cpu, 0777)) { |
| } |
| if (mkdir(cgroupdir_net, 0777)) { |
| } |
| int pid = getpid(); |
| char procs_file[128]; |
| snprintf(procs_file, sizeof(procs_file), "%s/cgroup.procs", cgroupdir); |
| if (!write_file(procs_file, "%d", pid)) { |
| } |
| snprintf(procs_file, sizeof(procs_file), "%s/cgroup.procs", cgroupdir_cpu); |
| if (!write_file(procs_file, "%d", pid)) { |
| } |
| snprintf(procs_file, sizeof(procs_file), "%s/cgroup.procs", cgroupdir_net); |
| if (!write_file(procs_file, "%d", pid)) { |
| } |
| int iter; |
| for (iter = 0;; iter++) { |
| char cwdbuf[32]; |
| sprintf(cwdbuf, "./%d", iter); |
| if (mkdir(cwdbuf, 0777)) |
| fail("failed to mkdir"); |
| int pid = fork(); |
| if (pid < 0) |
| fail("clone failed"); |
| if (pid == 0) { |
| prctl(PR_SET_PDEATHSIG, SIGKILL, 0, 0, 0); |
| setpgrp(); |
| if (chdir(cwdbuf)) |
| fail("failed to chdir"); |
| if (symlink(cgroupdir, "./cgroup")) { |
| } |
| if (symlink(cgroupdir_cpu, "./cgroup.cpu")) { |
| } |
| if (symlink(cgroupdir_net, "./cgroup.net")) { |
| } |
| execute_one(); |
| int fd; |
| for (fd = 3; fd < 30; fd++) |
| close(fd); |
| doexit(0); |
| } |
| |
| int status = 0; |
| uint64_t start = current_time_ms(); |
| for (;;) { |
| int res = waitpid(-1, &status, __WALL | WNOHANG); |
| if (res == pid) { |
| break; |
| } |
| usleep(1000); |
| if (current_time_ms() - start < 5 * 1000) |
| continue; |
| kill(-pid, SIGKILL); |
| kill(pid, SIGKILL); |
| while (waitpid(-1, &status, __WALL) != pid) { |
| } |
| break; |
| } |
| remove_dir(cwdbuf); |
| } |
| } |
| |
| struct thread_t { |
| int created, running, call; |
| pthread_t th; |
| }; |
| |
| static struct thread_t threads[16]; |
| static void execute_call(int call); |
| static int running; |
| static int collide; |
| |
| static void* thr(void* arg) |
| { |
| struct thread_t* th = (struct thread_t*)arg; |
| for (;;) { |
| while (!__atomic_load_n(&th->running, __ATOMIC_ACQUIRE)) |
| syscall(SYS_futex, &th->running, FUTEX_WAIT, 0, 0); |
| execute_call(th->call); |
| __atomic_fetch_sub(&running, 1, __ATOMIC_RELAXED); |
| __atomic_store_n(&th->running, 0, __ATOMIC_RELEASE); |
| syscall(SYS_futex, &th->running, FUTEX_WAKE); |
| } |
| return 0; |
| } |
| |
| static void execute(int num_calls) |
| { |
| int call, thread; |
| running = 0; |
| for (call = 0; call < num_calls; call++) { |
| for (thread = 0; thread < sizeof(threads) / sizeof(threads[0]); thread++) { |
| struct thread_t* th = &threads[thread]; |
| if (!th->created) { |
| th->created = 1; |
| pthread_attr_t attr; |
| pthread_attr_init(&attr); |
| pthread_attr_setstacksize(&attr, 128 << 10); |
| pthread_create(&th->th, &attr, thr, th); |
| } |
| if (!__atomic_load_n(&th->running, __ATOMIC_ACQUIRE)) { |
| th->call = call; |
| __atomic_fetch_add(&running, 1, __ATOMIC_RELAXED); |
| __atomic_store_n(&th->running, 1, __ATOMIC_RELEASE); |
| syscall(SYS_futex, &th->running, FUTEX_WAKE); |
| if (collide && call % 2) |
| break; |
| struct timespec ts; |
| ts.tv_sec = 0; |
| ts.tv_nsec = 20 * 1000 * 1000; |
| syscall(SYS_futex, &th->running, FUTEX_WAIT, 1, &ts); |
| if (__atomic_load_n(&running, __ATOMIC_RELAXED)) |
| usleep((call == num_calls - 1) ? 10000 : 1000); |
| break; |
| } |
| } |
| } |
| } |
| |
| #ifndef __NR_bpf |
| #define __NR_bpf 321 |
| #endif |
| |
| uint64_t r[1] = {0xffffffffffffffff}; |
| unsigned long long procid; |
| void execute_call(int call) |
| { |
| long res; |
| switch (call) { |
| case 0: |
| *(uint32_t*)0x20000200 = 2; |
| *(uint32_t*)0x20000204 = 0x70; |
| *(uint8_t*)0x20000208 = 0xe6; |
| *(uint8_t*)0x20000209 = 0; |
| *(uint8_t*)0x2000020a = 0; |
| *(uint8_t*)0x2000020b = 0; |
| *(uint32_t*)0x2000020c = 0; |
| *(uint64_t*)0x20000210 = 0; |
| *(uint64_t*)0x20000218 = 0; |
| *(uint64_t*)0x20000220 = 0; |
| STORE_BY_BITMASK(uint64_t, 0x20000228, 0, 0, 1); |
| STORE_BY_BITMASK(uint64_t, 0x20000228, 0, 1, 1); |
| STORE_BY_BITMASK(uint64_t, 0x20000228, 0, 2, 1); |
| STORE_BY_BITMASK(uint64_t, 0x20000228, 0, 3, 1); |
| STORE_BY_BITMASK(uint64_t, 0x20000228, 0, 4, 1); |
| STORE_BY_BITMASK(uint64_t, 0x20000228, 0, 5, 1); |
| STORE_BY_BITMASK(uint64_t, 0x20000228, 0, 6, 1); |
| STORE_BY_BITMASK(uint64_t, 0x20000228, 0x100000000000, 7, 1); |
| STORE_BY_BITMASK(uint64_t, 0x20000228, 0, 8, 1); |
| STORE_BY_BITMASK(uint64_t, 0x20000228, 0, 9, 1); |
| STORE_BY_BITMASK(uint64_t, 0x20000228, 0xffffffffffffbac7, 10, 1); |
| STORE_BY_BITMASK(uint64_t, 0x20000228, 0, 11, 1); |
| STORE_BY_BITMASK(uint64_t, 0x20000228, 0, 12, 1); |
| STORE_BY_BITMASK(uint64_t, 0x20000228, 0, 13, 1); |
| STORE_BY_BITMASK(uint64_t, 0x20000228, 0, 14, 1); |
| STORE_BY_BITMASK(uint64_t, 0x20000228, 0, 15, 2); |
| STORE_BY_BITMASK(uint64_t, 0x20000228, 0, 17, 1); |
| STORE_BY_BITMASK(uint64_t, 0x20000228, 0, 18, 1); |
| STORE_BY_BITMASK(uint64_t, 0x20000228, 0, 19, 1); |
| STORE_BY_BITMASK(uint64_t, 0x20000228, 0, 20, 1); |
| STORE_BY_BITMASK(uint64_t, 0x20000228, 0, 21, 1); |
| STORE_BY_BITMASK(uint64_t, 0x20000228, 0, 22, 1); |
| STORE_BY_BITMASK(uint64_t, 0x20000228, 0, 23, 1); |
| STORE_BY_BITMASK(uint64_t, 0x20000228, 0, 24, 1); |
| STORE_BY_BITMASK(uint64_t, 0x20000228, 0, 25, 1); |
| STORE_BY_BITMASK(uint64_t, 0x20000228, 0, 26, 1); |
| STORE_BY_BITMASK(uint64_t, 0x20000228, 0, 27, 1); |
| STORE_BY_BITMASK(uint64_t, 0x20000228, 0, 28, 1); |
| STORE_BY_BITMASK(uint64_t, 0x20000228, 0, 29, 35); |
| *(uint32_t*)0x20000230 = 0; |
| *(uint32_t*)0x20000234 = 0; |
| *(uint64_t*)0x20000238 = 0; |
| *(uint64_t*)0x20000240 = 0; |
| *(uint64_t*)0x20000248 = 0; |
| *(uint64_t*)0x20000250 = 0; |
| *(uint32_t*)0x20000258 = 0; |
| *(uint32_t*)0x2000025c = 0; |
| *(uint64_t*)0x20000260 = 0; |
| *(uint32_t*)0x20000268 = 0; |
| *(uint16_t*)0x2000026c = 0; |
| *(uint16_t*)0x2000026e = 0; |
| syscall(__NR_perf_event_open, 0x20000200, 0, 0, -1, 0); |
| break; |
| case 1: |
| *(uint32_t*)0x20000a40 = -1; |
| syscall(__NR_setsockopt, -1, 0x29, 0x24, 0x20000a40, 0x173); |
| break; |
| case 2: |
| syscall(__NR_socketpair, 0, 0, 0, 0x20000140); |
| break; |
| case 3: |
| syscall(__NR_socket, 0xa, 1, 0); |
| break; |
| case 4: |
| *(uint32_t*)0x20000280 = 0x12; |
| *(uint32_t*)0x20000284 = 9; |
| *(uint32_t*)0x20000288 = 4; |
| *(uint32_t*)0x2000028c = 1; |
| *(uint32_t*)0x20000290 = 0; |
| *(uint32_t*)0x20000294 = -1; |
| *(uint32_t*)0x20000298 = 0; |
| *(uint8_t*)0x2000029c = 0; |
| *(uint8_t*)0x2000029d = 0; |
| *(uint8_t*)0x2000029e = 0; |
| *(uint8_t*)0x2000029f = 0; |
| *(uint8_t*)0x200002a0 = 0; |
| *(uint8_t*)0x200002a1 = 0; |
| *(uint8_t*)0x200002a2 = 0; |
| *(uint8_t*)0x200002a3 = 0; |
| *(uint8_t*)0x200002a4 = 0; |
| *(uint8_t*)0x200002a5 = 0; |
| *(uint8_t*)0x200002a6 = 0; |
| *(uint8_t*)0x200002a7 = 0; |
| *(uint8_t*)0x200002a8 = 0; |
| *(uint8_t*)0x200002a9 = 0; |
| *(uint8_t*)0x200002aa = 0; |
| *(uint8_t*)0x200002ab = 0; |
| res = syscall(__NR_bpf, 0, 0x20000280, 0x34d); |
| if (res != -1) |
| r[0] = res; |
| break; |
| case 5: |
| syscall(__NR_socketpair, 0x1b, 0x800, 1, 0x20000040); |
| break; |
| case 6: |
| *(uint32_t*)0x20000000 = 0; |
| *(uint32_t*)0x20000004 = 0; |
| *(uint32_t*)0x20000008 = 4; |
| *(uint32_t*)0x2000000c = 0; |
| *(uint32_t*)0x20000010 = 0; |
| *(uint32_t*)0x20000014 = -1; |
| *(uint32_t*)0x20000018 = 0; |
| *(uint8_t*)0x2000001c = 0; |
| *(uint8_t*)0x2000001d = 0; |
| *(uint8_t*)0x2000001e = 0; |
| *(uint8_t*)0x2000001f = 0; |
| *(uint8_t*)0x20000020 = 0; |
| *(uint8_t*)0x20000021 = 0; |
| *(uint8_t*)0x20000022 = 0; |
| *(uint8_t*)0x20000023 = 0; |
| *(uint8_t*)0x20000024 = 0; |
| *(uint8_t*)0x20000025 = 0; |
| *(uint8_t*)0x20000026 = 0; |
| *(uint8_t*)0x20000027 = 0; |
| *(uint8_t*)0x20000028 = 0; |
| *(uint8_t*)0x20000029 = 0; |
| *(uint8_t*)0x2000002a = 0; |
| *(uint8_t*)0x2000002b = 0; |
| syscall(__NR_bpf, 0, 0x20000000, 0xce); |
| break; |
| case 7: |
| *(uint32_t*)0x20000180 = r[0]; |
| *(uint64_t*)0x20000188 = 0x20000000; |
| *(uint64_t*)0x20000190 = 0x20000140; |
| *(uint64_t*)0x20000198 = 0; |
| syscall(__NR_bpf, 2, 0x20000180, 0x20); |
| break; |
| case 8: |
| *(uint32_t*)0x20000180 = r[0]; |
| *(uint64_t*)0x20000188 = 0x20000080; |
| *(uint64_t*)0x20000190 = 0x20000140; |
| *(uint64_t*)0x20000198 = 0; |
| syscall(__NR_bpf, 2, 0x20000180, 0x20); |
| break; |
| } |
| } |
| |
| void execute_one() |
| { |
| execute(9); |
| collide = 1; |
| execute(9); |
| } |
| |
| int main() |
| { |
| syscall(__NR_mmap, 0x20000000, 0x1000000, 3, 0x32, -1, 0); |
| char* cwd = get_current_dir_name(); |
| for (procid = 0; procid < 8; procid++) { |
| if (fork() == 0) { |
| for (;;) { |
| if (chdir(cwd)) |
| fail("failed to chdir"); |
| use_temporary_dir(); |
| do_sandbox_none(); |
| } |
| } |
| } |
| sleep(1000000); |
| return 0; |
| } |