| // general protection fault in __dentry_path |
| // https://syzkaller.appspot.com/bug?id=824f609ea50e2c2cd161cb64758c95c0e114ce6e |
| // status:fixed |
| // autogenerated by syzkaller (https://github.com/google/syzkaller) |
| |
| #define _GNU_SOURCE |
| |
| #include <dirent.h> |
| #include <endian.h> |
| #include <errno.h> |
| #include <fcntl.h> |
| #include <pthread.h> |
| #include <signal.h> |
| #include <stdint.h> |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <string.h> |
| #include <sys/prctl.h> |
| #include <sys/stat.h> |
| #include <sys/syscall.h> |
| #include <sys/types.h> |
| #include <sys/wait.h> |
| #include <time.h> |
| #include <unistd.h> |
| |
| #include <linux/futex.h> |
| |
| unsigned long long procid; |
| |
| 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); |
| } |
| |
| #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)))) |
| |
| 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 void kill_and_wait(int pid, int* status) |
| { |
| kill(-pid, SIGKILL); |
| kill(pid, SIGKILL); |
| int i; |
| for (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) { |
| } |
| } |
| |
| #define SYZ_HAVE_SETUP_TEST 1 |
| static void setup_test() |
| { |
| prctl(PR_SET_PDEATHSIG, SIGKILL, 0, 0, 0); |
| setpgrp(); |
| } |
| |
| #define SYZ_HAVE_RESET_TEST 1 |
| static void reset_test() |
| { |
| 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 execute_one(void) |
| { |
| int i, call, thread; |
| int collide = 0; |
| again: |
| for (call = 0; call < 26; 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); |
| if (!collide) { |
| collide = 1; |
| goto again; |
| } |
| } |
| |
| static void execute_one(void); |
| |
| #define WAIT_FLAGS __WALL |
| |
| static void loop(void) |
| { |
| int iter; |
| for (iter = 0;; iter++) { |
| int pid = fork(); |
| if (pid < 0) |
| exit(1); |
| if (pid == 0) { |
| setup_test(); |
| execute_one(); |
| reset_test(); |
| 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 < 5 * 1000) |
| continue; |
| kill_and_wait(pid, &status); |
| break; |
| } |
| } |
| } |
| #ifndef __NR_bpf |
| #define __NR_bpf 357 |
| #endif |
| #ifndef __NR_clone |
| #define __NR_clone 120 |
| #endif |
| #ifndef __NR_getgid |
| #define __NR_getgid 47 |
| #endif |
| #ifndef __NR_getpid |
| #define __NR_getpid 20 |
| #endif |
| #ifndef __NR_getsockopt |
| #define __NR_getsockopt 365 |
| #endif |
| #ifndef __NR_ioctl |
| #define __NR_ioctl 54 |
| #endif |
| #ifndef __NR_link |
| #define __NR_link 9 |
| #endif |
| #ifndef __NR_mmap |
| #define __NR_mmap 192 |
| #endif |
| #ifndef __NR_openat |
| #define __NR_openat 295 |
| #endif |
| #ifndef __NR_perf_event_open |
| #define __NR_perf_event_open 336 |
| #endif |
| #ifndef __NR_pipe |
| #define __NR_pipe 42 |
| #endif |
| #ifndef __NR_ptrace |
| #define __NR_ptrace 26 |
| #endif |
| #ifndef __NR_rt_sigtimedwait |
| #define __NR_rt_sigtimedwait 177 |
| #endif |
| #ifndef __NR_rt_tgsigqueueinfo |
| #define __NR_rt_tgsigqueueinfo 335 |
| #endif |
| #ifndef __NR_symlinkat |
| #define __NR_symlinkat 304 |
| #endif |
| #ifndef __NR_write |
| #define __NR_write 4 |
| #endif |
| #undef __NR_mmap |
| #define __NR_mmap __NR_mmap2 |
| |
| uint64_t r[4] = {0x0, 0xffffffffffffffff, 0xffffffffffffffff, |
| 0xffffffffffffffff}; |
| |
| void execute_call(int call) |
| { |
| long res; |
| switch (call) { |
| case 0: |
| syscall(__NR_clone, 0x2001fff, 0, 0x99999999, 0, -1); |
| break; |
| case 1: |
| syscall(__NR_rt_sigtimedwait, 0, 0, 0, 0); |
| break; |
| case 2: |
| res = syscall(__NR_getpid); |
| if (res != -1) |
| r[0] = res; |
| break; |
| case 3: |
| *(uint32_t*)0x20000100 = 0; |
| *(uint32_t*)0x20000104 = 0; |
| *(uint32_t*)0x20000108 = 0; |
| syscall(__NR_rt_tgsigqueueinfo, (long)r[0], (long)r[0], 0x16, 0x20000100); |
| break; |
| case 4: |
| memcpy((void*)0x20000080, "/dev/kvm\000", 9); |
| res = syscall(__NR_openat, 0xffffff9c, 0x20000080, 0, 0); |
| if (res != -1) |
| r[1] = res; |
| break; |
| case 5: |
| res = syscall(__NR_ioctl, (long)r[1], 0xae01, 0); |
| if (res != -1) |
| r[2] = res; |
| break; |
| case 6: |
| res = syscall(__NR_ioctl, (long)r[2], 0xae41, 0); |
| if (res != -1) |
| r[3] = res; |
| break; |
| case 7: |
| *(uint32_t*)0x2001d000 = 1; |
| *(uint32_t*)0x2001d004 = 0x70; |
| *(uint8_t*)0x2001d008 = 0; |
| *(uint8_t*)0x2001d009 = 0; |
| *(uint8_t*)0x2001d00a = 0; |
| *(uint8_t*)0x2001d00b = 0; |
| *(uint32_t*)0x2001d00c = 0; |
| *(uint64_t*)0x2001d010 = 0x7f; |
| *(uint64_t*)0x2001d018 = 0; |
| *(uint64_t*)0x2001d020 = 0; |
| STORE_BY_BITMASK(uint64_t, , 0x2001d028, 0, 0, 1); |
| STORE_BY_BITMASK(uint64_t, , 0x2001d028, 0, 1, 1); |
| STORE_BY_BITMASK(uint64_t, , 0x2001d028, 0, 2, 1); |
| STORE_BY_BITMASK(uint64_t, , 0x2001d028, 0, 3, 1); |
| STORE_BY_BITMASK(uint64_t, , 0x2001d028, 0, 4, 1); |
| STORE_BY_BITMASK(uint64_t, , 0x2001d028, 0x81, 5, 1); |
| STORE_BY_BITMASK(uint64_t, , 0x2001d028, 0, 6, 1); |
| STORE_BY_BITMASK(uint64_t, , 0x2001d028, 0, 7, 1); |
| STORE_BY_BITMASK(uint64_t, , 0x2001d028, 0, 8, 1); |
| STORE_BY_BITMASK(uint64_t, , 0x2001d028, 0, 9, 1); |
| STORE_BY_BITMASK(uint64_t, , 0x2001d028, 0, 10, 1); |
| STORE_BY_BITMASK(uint64_t, , 0x2001d028, 0, 11, 1); |
| STORE_BY_BITMASK(uint64_t, , 0x2001d028, 0, 12, 1); |
| STORE_BY_BITMASK(uint64_t, , 0x2001d028, 0, 13, 1); |
| STORE_BY_BITMASK(uint64_t, , 0x2001d028, 0, 14, 1); |
| STORE_BY_BITMASK(uint64_t, , 0x2001d028, 0, 15, 2); |
| STORE_BY_BITMASK(uint64_t, , 0x2001d028, 0, 17, 1); |
| STORE_BY_BITMASK(uint64_t, , 0x2001d028, 0, 18, 1); |
| STORE_BY_BITMASK(uint64_t, , 0x2001d028, 0, 19, 1); |
| STORE_BY_BITMASK(uint64_t, , 0x2001d028, 0, 20, 1); |
| STORE_BY_BITMASK(uint64_t, , 0x2001d028, 0, 21, 1); |
| STORE_BY_BITMASK(uint64_t, , 0x2001d028, 0, 22, 1); |
| STORE_BY_BITMASK(uint64_t, , 0x2001d028, 0, 23, 1); |
| STORE_BY_BITMASK(uint64_t, , 0x2001d028, 0, 24, 1); |
| STORE_BY_BITMASK(uint64_t, , 0x2001d028, 0, 25, 1); |
| STORE_BY_BITMASK(uint64_t, , 0x2001d028, 0, 26, 1); |
| STORE_BY_BITMASK(uint64_t, , 0x2001d028, 0, 27, 1); |
| STORE_BY_BITMASK(uint64_t, , 0x2001d028, 0, 28, 1); |
| STORE_BY_BITMASK(uint64_t, , 0x2001d028, 0, 29, 35); |
| *(uint32_t*)0x2001d030 = 0; |
| *(uint32_t*)0x2001d034 = 0; |
| *(uint64_t*)0x2001d038 = 0; |
| *(uint64_t*)0x2001d040 = 0; |
| *(uint64_t*)0x2001d048 = 0; |
| *(uint64_t*)0x2001d050 = 0; |
| *(uint32_t*)0x2001d058 = 0; |
| *(uint32_t*)0x2001d05c = 0; |
| *(uint64_t*)0x2001d060 = 0; |
| *(uint32_t*)0x2001d068 = 0; |
| *(uint16_t*)0x2001d06c = 0; |
| *(uint16_t*)0x2001d06e = 0; |
| syscall(__NR_perf_event_open, 0x2001d000, 0, -1, -1, 0); |
| break; |
| case 8: |
| syscall(__NR_ioctl, (long)r[3], 0xaeb7, 0); |
| break; |
| case 9: |
| syscall(__NR_pipe, 0); |
| break; |
| case 10: |
| *(uint32_t*)0x20000a00 = 0; |
| syscall(__NR_getsockopt, -1, 0x84, 0x6f, 0, 0x20000a00); |
| break; |
| case 11: |
| syscall(__NR_write, -1, 0, 0); |
| break; |
| case 12: |
| syscall(__NR_ioctl, (long)r[3], 0x4008ae8a, 0); |
| break; |
| case 13: |
| *(uint32_t*)0x20000600 = 0; |
| syscall(__NR_getsockopt, -1, 0x84, 0x75, 0, 0x20000600); |
| break; |
| case 14: |
| syscall(__NR_ioctl, -1, 0xc008ae09, 0x20000840); |
| break; |
| case 15: |
| syscall(__NR_bpf, 7, 0, 0); |
| break; |
| case 16: |
| *(uint32_t*)0x200007c0 = 0; |
| *(uint32_t*)0x200007c4 = 0x3ff; |
| *(uint32_t*)0x20000800 = 8; |
| syscall(__NR_getsockopt, -1, 0x84, 0x7b, 0x200007c0, 0x20000800); |
| break; |
| case 17: |
| *(uint32_t*)0x20000040 = 0; |
| *(uint32_t*)0x20000044 = 0; |
| *(uint64_t*)0x20000048 = 0; |
| *(uint64_t*)0x20000050 = 0x2000; |
| *(uint32_t*)0x20000058 = 0x20ffe000; |
| syscall(__NR_ioctl, (long)r[2], 0x4020ae46, 0x20000040); |
| break; |
| case 18: |
| memcpy((void*)0x20002d40, "./file0\000", 8); |
| syscall(__NR_symlinkat, 0, -1, 0x20002d40); |
| break; |
| case 19: |
| syscall(__NR_ioctl, (long)r[3], 0x4138ae84, 0); |
| break; |
| case 20: |
| syscall(__NR_ioctl, (long)r[3], 0xae80, 0); |
| break; |
| case 21: |
| syscall(__NR_ioctl, -1, 0xc0405619, 0); |
| break; |
| case 22: |
| syscall(__NR_link, 0, 0); |
| break; |
| case 23: |
| *(uint32_t*)0x2001d000 = 1; |
| *(uint32_t*)0x2001d004 = 0x70; |
| *(uint8_t*)0x2001d008 = 0; |
| *(uint8_t*)0x2001d009 = 0; |
| *(uint8_t*)0x2001d00a = 0; |
| *(uint8_t*)0x2001d00b = 0; |
| *(uint32_t*)0x2001d00c = 0; |
| *(uint64_t*)0x2001d010 = 0x7f; |
| *(uint64_t*)0x2001d018 = 0; |
| *(uint64_t*)0x2001d020 = 0; |
| STORE_BY_BITMASK(uint64_t, , 0x2001d028, 0, 0, 1); |
| STORE_BY_BITMASK(uint64_t, , 0x2001d028, 0, 1, 1); |
| STORE_BY_BITMASK(uint64_t, , 0x2001d028, 0, 2, 1); |
| STORE_BY_BITMASK(uint64_t, , 0x2001d028, 0, 3, 1); |
| STORE_BY_BITMASK(uint64_t, , 0x2001d028, 0, 4, 1); |
| STORE_BY_BITMASK(uint64_t, , 0x2001d028, 3, 5, 1); |
| STORE_BY_BITMASK(uint64_t, , 0x2001d028, 0, 6, 1); |
| STORE_BY_BITMASK(uint64_t, , 0x2001d028, 0, 7, 1); |
| STORE_BY_BITMASK(uint64_t, , 0x2001d028, 0, 8, 1); |
| STORE_BY_BITMASK(uint64_t, , 0x2001d028, 0, 9, 1); |
| STORE_BY_BITMASK(uint64_t, , 0x2001d028, 0, 10, 1); |
| STORE_BY_BITMASK(uint64_t, , 0x2001d028, 0, 11, 1); |
| STORE_BY_BITMASK(uint64_t, , 0x2001d028, 0, 12, 1); |
| STORE_BY_BITMASK(uint64_t, , 0x2001d028, 0, 13, 1); |
| STORE_BY_BITMASK(uint64_t, , 0x2001d028, 0, 14, 1); |
| STORE_BY_BITMASK(uint64_t, , 0x2001d028, 0, 15, 2); |
| STORE_BY_BITMASK(uint64_t, , 0x2001d028, 0, 17, 1); |
| STORE_BY_BITMASK(uint64_t, , 0x2001d028, 0, 18, 1); |
| STORE_BY_BITMASK(uint64_t, , 0x2001d028, 0, 19, 1); |
| STORE_BY_BITMASK(uint64_t, , 0x2001d028, 0, 20, 1); |
| STORE_BY_BITMASK(uint64_t, , 0x2001d028, 0, 21, 1); |
| STORE_BY_BITMASK(uint64_t, , 0x2001d028, 0, 22, 1); |
| STORE_BY_BITMASK(uint64_t, , 0x2001d028, 0, 23, 1); |
| STORE_BY_BITMASK(uint64_t, , 0x2001d028, 0, 24, 1); |
| STORE_BY_BITMASK(uint64_t, , 0x2001d028, 0, 25, 1); |
| STORE_BY_BITMASK(uint64_t, , 0x2001d028, 0, 26, 1); |
| STORE_BY_BITMASK(uint64_t, , 0x2001d028, 0, 27, 1); |
| STORE_BY_BITMASK(uint64_t, , 0x2001d028, 0, 28, 1); |
| STORE_BY_BITMASK(uint64_t, , 0x2001d028, 0, 29, 35); |
| *(uint32_t*)0x2001d030 = 0; |
| *(uint32_t*)0x2001d034 = 0; |
| *(uint64_t*)0x2001d038 = 0; |
| *(uint64_t*)0x2001d040 = 0; |
| *(uint64_t*)0x2001d048 = 0; |
| *(uint64_t*)0x2001d050 = 0; |
| *(uint32_t*)0x2001d058 = 0; |
| *(uint32_t*)0x2001d05c = 0; |
| *(uint64_t*)0x2001d060 = 0; |
| *(uint32_t*)0x2001d068 = 0; |
| *(uint16_t*)0x2001d06c = 0; |
| *(uint16_t*)0x2001d06e = 0; |
| syscall(__NR_perf_event_open, 0x2001d000, 0, -1, -1, 0); |
| break; |
| case 24: |
| syscall(__NR_ptrace, 0x10, (long)r[0], 0, 0); |
| break; |
| case 25: |
| syscall(__NR_getgid); |
| break; |
| } |
| } |
| int main(void) |
| { |
| syscall(__NR_mmap, 0x20000000, 0x1000000, 3, 0x32, -1, 0); |
| for (procid = 0; procid < 6; procid++) { |
| if (fork() == 0) { |
| loop(); |
| } |
| } |
| sleep(1000000); |
| return 0; |
| } |