| // BUG: sleeping function called from invalid context in htb_destroy |
| // https://syzkaller.appspot.com/bug?id=d1e4c9e39045dc33b093078bbf9c4328f2777133 |
| // status:open |
| // autogenerated by syzkaller (https://github.com/google/syzkaller) |
| |
| #define _GNU_SOURCE |
| |
| #include <endian.h> |
| #include <errno.h> |
| #include <fcntl.h> |
| #include <pthread.h> |
| #include <sched.h> |
| #include <stdarg.h> |
| #include <stdbool.h> |
| #include <stdint.h> |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <string.h> |
| #include <sys/mount.h> |
| #include <sys/prctl.h> |
| #include <sys/resource.h> |
| #include <sys/stat.h> |
| #include <sys/syscall.h> |
| #include <sys/time.h> |
| #include <sys/types.h> |
| #include <sys/wait.h> |
| #include <time.h> |
| #include <unistd.h> |
| |
| #include <linux/capability.h> |
| #include <linux/futex.h> |
| |
| 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 thread_start(void* (*fn)(void*), void* arg) |
| { |
| pthread_t th; |
| pthread_attr_t attr; |
| pthread_attr_init(&attr); |
| pthread_attr_setstacksize(&attr, 128 << 10); |
| int i; |
| for (i = 0; i < 100; i++) { |
| if (pthread_create(&th, &attr, fn, arg) == 0) { |
| pthread_attr_destroy(&attr); |
| return; |
| } |
| if (errno == EAGAIN) { |
| usleep(50); |
| continue; |
| } |
| break; |
| } |
| exit(1); |
| } |
| |
| typedef struct { |
| int state; |
| } event_t; |
| |
| static void event_init(event_t* ev) |
| { |
| ev->state = 0; |
| } |
| |
| static void event_reset(event_t* ev) |
| { |
| ev->state = 0; |
| } |
| |
| static void event_set(event_t* ev) |
| { |
| if (ev->state) |
| exit(1); |
| __atomic_store_n(&ev->state, 1, __ATOMIC_RELEASE); |
| syscall(SYS_futex, &ev->state, FUTEX_WAKE | FUTEX_PRIVATE_FLAG); |
| } |
| |
| static void event_wait(event_t* ev) |
| { |
| while (!__atomic_load_n(&ev->state, __ATOMIC_ACQUIRE)) |
| syscall(SYS_futex, &ev->state, FUTEX_WAIT | FUTEX_PRIVATE_FLAG, 0, 0); |
| } |
| |
| static int event_isset(event_t* ev) |
| { |
| return __atomic_load_n(&ev->state, __ATOMIC_ACQUIRE); |
| } |
| |
| static int event_timedwait(event_t* ev, uint64_t timeout) |
| { |
| uint64_t start = current_time_ms(); |
| uint64_t now = start; |
| for (;;) { |
| uint64_t remain = timeout - (now - start); |
| struct timespec ts; |
| ts.tv_sec = remain / 1000; |
| ts.tv_nsec = (remain % 1000) * 1000 * 1000; |
| syscall(SYS_futex, &ev->state, FUTEX_WAIT | FUTEX_PRIVATE_FLAG, 0, &ts); |
| if (__atomic_load_n(&ev->state, __ATOMIC_RELAXED)) |
| return 1; |
| now = current_time_ms(); |
| if (now - start > timeout) |
| return 0; |
| } |
| } |
| |
| 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_common() |
| { |
| if (mount(0, "/sys/fs/fuse/connections", "fusectl", 0, 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 = (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 = 0; |
| setrlimit(RLIMIT_CORE, &rlim); |
| rlim.rlim_cur = rlim.rlim_max = 256; |
| setrlimit(RLIMIT_NOFILE, &rlim); |
| if (unshare(CLONE_NEWNS)) { |
| } |
| 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); |
| } |
| |
| 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)) { |
| } |
| loop(); |
| exit(1); |
| } |
| |
| static void close_fds() |
| { |
| int fd; |
| for (fd = 3; fd < 30; fd++) |
| close(fd); |
| } |
| |
| struct thread_t { |
| int created, call; |
| event_t ready, done; |
| }; |
| |
| static struct thread_t threads[16]; |
| static void execute_call(int call); |
| static int running; |
| |
| static void* thr(void* arg) |
| { |
| struct thread_t* th = (struct thread_t*)arg; |
| for (;;) { |
| event_wait(&th->ready); |
| event_reset(&th->ready); |
| execute_call(th->call); |
| __atomic_fetch_sub(&running, 1, __ATOMIC_RELAXED); |
| event_set(&th->done); |
| } |
| return 0; |
| } |
| |
| static void loop(void) |
| { |
| int i, call, thread; |
| int collide = 0; |
| again: |
| for (call = 0; call < 10; call++) { |
| for (thread = 0; thread < (int)(sizeof(threads) / sizeof(threads[0])); |
| thread++) { |
| struct thread_t* th = &threads[thread]; |
| if (!th->created) { |
| th->created = 1; |
| event_init(&th->ready); |
| event_init(&th->done); |
| event_set(&th->done); |
| thread_start(thr, th); |
| } |
| if (!event_isset(&th->done)) |
| continue; |
| event_reset(&th->done); |
| th->call = call; |
| __atomic_fetch_add(&running, 1, __ATOMIC_RELAXED); |
| event_set(&th->ready); |
| if (collide && (call % 2) == 0) |
| break; |
| event_timedwait(&th->done, 45); |
| break; |
| } |
| } |
| for (i = 0; i < 100 && __atomic_load_n(&running, __ATOMIC_RELAXED); i++) |
| sleep_ms(1); |
| close_fds(); |
| if (!collide) { |
| collide = 1; |
| goto again; |
| } |
| } |
| |
| uint64_t r[5] = {0xffffffffffffffff, 0xffffffffffffffff, 0xffffffffffffffff, |
| 0xffffffffffffffff, 0x0}; |
| |
| void execute_call(int call) |
| { |
| intptr_t res; |
| switch (call) { |
| case 0: |
| res = syscall(__NR_socket, 0x10, 3, 0); |
| if (res != -1) |
| r[0] = res; |
| break; |
| case 1: |
| res = syscall(__NR_socket, 0x10, 3, 0); |
| if (res != -1) |
| r[1] = res; |
| break; |
| case 2: |
| res = syscall(__NR_socket, 0x10, 3, 0); |
| if (res != -1) |
| r[2] = res; |
| break; |
| case 3: |
| syscall(__NR_openat, 0xffffffffffffff9c, 0, 2, 0); |
| break; |
| case 4: |
| res = syscall(__NR_socket, 0x10, 0x803, 0); |
| if (res != -1) |
| r[3] = res; |
| break; |
| case 5: |
| *(uint64_t*)0x200001c0 = 0; |
| *(uint32_t*)0x200001c8 = 0; |
| *(uint64_t*)0x200001d0 = 0x20000180; |
| *(uint64_t*)0x20000180 = 0; |
| *(uint64_t*)0x20000188 = 0; |
| *(uint64_t*)0x200001d8 = 1; |
| *(uint64_t*)0x200001e0 = 0; |
| *(uint64_t*)0x200001e8 = 0; |
| *(uint32_t*)0x200001f0 = 0; |
| syscall(__NR_sendmsg, r[3], 0x200001c0, 0); |
| break; |
| case 6: |
| *(uint32_t*)0x20000200 = 0x14; |
| res = syscall(__NR_getsockname, r[3], 0x20000440, 0x20000200); |
| if (res != -1) |
| r[4] = *(uint32_t*)0x20000444; |
| break; |
| case 7: |
| syscall(__NR_sendmsg, r[2], 0, 0); |
| break; |
| case 8: |
| *(uint64_t*)0x20000240 = 0; |
| *(uint32_t*)0x20000248 = 0; |
| *(uint64_t*)0x20000250 = 0x20000080; |
| *(uint64_t*)0x20000080 = 0x20003e40; |
| *(uint32_t*)0x20003e40 = 0x148; |
| *(uint16_t*)0x20003e44 = 0x24; |
| *(uint16_t*)0x20003e46 = 0x507; |
| *(uint32_t*)0x20003e48 = 0; |
| *(uint32_t*)0x20003e4c = 0; |
| *(uint8_t*)0x20003e50 = 0; |
| *(uint32_t*)0x20003e54 = r[4]; |
| *(uint16_t*)0x20003e58 = 0; |
| *(uint16_t*)0x20003e5a = 0; |
| *(uint16_t*)0x20003e5c = 0xfff1; |
| *(uint16_t*)0x20003e5e = -1; |
| *(uint16_t*)0x20003e60 = 0; |
| *(uint16_t*)0x20003e62 = 0; |
| *(uint16_t*)0x20003e64 = 8; |
| *(uint16_t*)0x20003e66 = 1; |
| memcpy((void*)0x20003e68, "red\000", 4); |
| *(uint16_t*)0x20003e6c = 0x11c; |
| *(uint16_t*)0x20003e6e = 2; |
| *(uint16_t*)0x20003e70 = 0x104; |
| *(uint16_t*)0x20003e72 = 2; |
| memcpy((void*)0x20003e74, |
| "\x77\x83\xaf\x7a\xa5\x52\xeb\x10\x64\x87\x31\x14\x62\xcb\x07\xa4" |
| "\x1b\x2d\x4a\xa6\x25\xa8\x11\xc4\xe1\xd4\xf2\x28\x59\xba\x16\x76" |
| "\x8b\xc2\x65\xca\xdf\xb9\x46\xf0\x47\x8d\x60\x12\x5c\x62\x0f\x5c" |
| "\x75\x58\x19\x93\x27\x7e\xed\xc5\xda\x9c\xe7\x08\x42\x07\x01\x87" |
| "\x8c\xcc\x94\xc9\xb2\xc2\xc1\x32\x55\x2d\xa7\xdb\xe8\xb2\x70\x9d" |
| "\x09\x3e\x52\xcb\x0d\x3f\x3b\xeb\xde\x8a\x18\xd1\x59\x2b\x8b\xf4" |
| "\xc5\x53\xc8\xfc\xf1\x90\x1a\x35\x83\x67\xc4\xf9\x23\x0c\xea\x8b" |
| "\x6b\xe9\x95\xf2\x94\x5f\x5f\xa7\xa7\x63\x55\x76\xf7\x7f\x82\x71" |
| "\x4d\x85\x71\x40\x6b\x73\x2d\x7a\x37\x10\x9c\xa0\x8c\x00\xcc\x02" |
| "\xd0\xcb\x8a\x2d\xaf\xff\xba\xa6\x2b\x8f\x1f\x7f\x69\xae\x9c\xd0" |
| "\x9f\x45\xb8\x3a\x0d\x21\x66\x23\x8b\x61\x01\x93\xb9\x4b\x38\x34" |
| "\x94\x43\xf9\x9f\xa0\x4a\x15\x20\x58\xc8\x60\xf9\xcc\xcb\xa1\xab" |
| "\x49\x83\x4f\xc5\x50\x7f\xa2\x3b\x46\xb5\x71\xf9\x03\xc4\x6c\x15" |
| "\x67\xbb\xcb\x4f\x99\x5f\x7a\x2c\x32\x83\x76\x92\x4b\x9a\x78\x98" |
| "\x9d\xd0\x5d\xd3\x18\x70\x95\x44\xd2\x56\xf9\x09\x33\x99\x88\x7c" |
| "\xde\xa8\xc5\x04\xf3\x0c\x1c\xe9\xef\x5d\x42\xa6\x84\x24\x5d\xb3", |
| 256); |
| *(uint16_t*)0x20003f74 = 0x14; |
| *(uint16_t*)0x20003f76 = 1; |
| *(uint32_t*)0x20003f78 = 1; |
| *(uint32_t*)0x20003f7c = 0; |
| *(uint32_t*)0x20003f80 = 0; |
| *(uint8_t*)0x20003f84 = 0; |
| *(uint8_t*)0x20003f85 = -1; |
| *(uint8_t*)0x20003f86 = 0; |
| *(uint8_t*)0x20003f87 = 0; |
| *(uint64_t*)0x20000088 = 0x148; |
| *(uint64_t*)0x20000258 = 1; |
| *(uint64_t*)0x20000260 = 0; |
| *(uint64_t*)0x20000268 = 0; |
| *(uint32_t*)0x20000270 = 0; |
| syscall(__NR_sendmsg, r[1], 0x20000240, 0); |
| break; |
| case 9: |
| *(uint64_t*)0x20000240 = 0; |
| *(uint32_t*)0x20000248 = 0; |
| *(uint64_t*)0x20000250 = 0x20000080; |
| *(uint64_t*)0x20000080 = 0x20000180; |
| *(uint32_t*)0x20000180 = 0x48; |
| *(uint16_t*)0x20000184 = 0x24; |
| *(uint16_t*)0x20000186 = 0x507; |
| *(uint32_t*)0x20000188 = 0; |
| *(uint32_t*)0x2000018c = 0; |
| *(uint8_t*)0x20000190 = 0; |
| *(uint32_t*)0x20000194 = r[4]; |
| *(uint16_t*)0x20000198 = 0; |
| *(uint16_t*)0x2000019a = 0; |
| *(uint16_t*)0x2000019c = 0; |
| *(uint16_t*)0x2000019e = -1; |
| *(uint16_t*)0x200001a0 = 0; |
| *(uint16_t*)0x200001a2 = 0; |
| *(uint16_t*)0x200001a4 = 8; |
| *(uint16_t*)0x200001a6 = 1; |
| memcpy((void*)0x200001a8, "htb\000", 4); |
| *(uint16_t*)0x200001ac = 0x1c; |
| *(uint16_t*)0x200001ae = 2; |
| *(uint16_t*)0x200001b0 = 0x18; |
| *(uint16_t*)0x200001b2 = 2; |
| *(uint32_t*)0x200001b4 = 3; |
| *(uint32_t*)0x200001b8 = 0; |
| *(uint32_t*)0x200001bc = 0; |
| *(uint32_t*)0x200001c0 = 0; |
| *(uint32_t*)0x200001c4 = 0; |
| *(uint64_t*)0x20000088 = 0x48; |
| *(uint64_t*)0x20000258 = 1; |
| *(uint64_t*)0x20000260 = 0; |
| *(uint64_t*)0x20000268 = 0; |
| *(uint32_t*)0x20000270 = 0; |
| syscall(__NR_sendmsg, r[0], 0x20000240, 0); |
| break; |
| } |
| } |
| int main(void) |
| { |
| syscall(__NR_mmap, 0x20000000, 0x1000000, 3, 0x32, -1, 0); |
| do_sandbox_none(); |
| return 0; |
| } |