| // KASAN: use-after-free Read in pppol2tp_release |
| // https://syzkaller.appspot.com/bug?id=426c45d0de1d60454704c7ef57e7fbb48712a56e |
| // status:open |
| // autogenerated by syzkaller (http://github.com/google/syzkaller) |
| |
| #define _GNU_SOURCE |
| #include <endian.h> |
| #include <linux/futex.h> |
| #include <pthread.h> |
| #include <stdint.h> |
| #include <stdlib.h> |
| #include <string.h> |
| #include <sys/syscall.h> |
| #include <unistd.h> |
| |
| static void test(); |
| |
| void loop() |
| { |
| while (1) { |
| test(); |
| } |
| } |
| |
| 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 (running) |
| usleep((call == num_calls - 1) ? 10000 : 1000); |
| break; |
| } |
| } |
| } |
| } |
| |
| long r[4]; |
| void execute_call(int call) |
| { |
| switch (call) { |
| case 0: |
| syscall(__NR_mmap, 0x20000000, 0xe7a000, 3, 0x32, -1, 0); |
| break; |
| case 1: |
| r[0] = syscall(__NR_socket, 0x18, 0, 1); |
| break; |
| case 2: |
| *(uint32_t*)0x20245ffc = 8; |
| syscall(__NR_getsockname, r[0], 0x20e78000, 0x20245ffc); |
| break; |
| case 3: |
| *(uint16_t*)0x206f2ff0 = 0x1a; |
| *(uint16_t*)0x206f2ff2 = htobe16(0); |
| *(uint8_t*)0x206f2ff4 = -1; |
| *(uint8_t*)0x206f2ff5 = 1; |
| *(uint8_t*)0x206f2ff6 = 1; |
| *(uint8_t*)0x206f2ff7 = 6; |
| *(uint8_t*)0x206f2ff8 = -1; |
| *(uint8_t*)0x206f2ff9 = -1; |
| *(uint8_t*)0x206f2ffa = -1; |
| *(uint8_t*)0x206f2ffb = -1; |
| *(uint8_t*)0x206f2ffc = -1; |
| *(uint8_t*)0x206f2ffd = -1; |
| *(uint8_t*)0x206f2ffe = 0; |
| *(uint8_t*)0x206f2fff = 0; |
| syscall(__NR_bind, r[0], 0x206f2ff0, 0x10); |
| break; |
| case 4: |
| *(uint16_t*)0x20002000 = 0x1f; |
| *(uint8_t*)0x20002002 = 1; |
| *(uint8_t*)0x20002003 = 0; |
| *(uint8_t*)0x20002004 = 0; |
| *(uint8_t*)0x20002005 = 0; |
| *(uint8_t*)0x20002006 = 0; |
| *(uint8_t*)0x20002007 = 0; |
| syscall(__NR_connect, r[0], 0x20002000, 0x32); |
| break; |
| case 5: |
| r[1] = syscall(__NR_socket, 0xa, 2, 0); |
| break; |
| case 6: |
| r[2] = syscall(__NR_socket, 0x18, 1, 1); |
| break; |
| case 7: |
| *(uint16_t*)0x20e71000 = 0x18; |
| *(uint32_t*)0x20e71002 = 1; |
| *(uint32_t*)0x20e71006 = 0; |
| *(uint32_t*)0x20e7100a = r[1]; |
| *(uint16_t*)0x20e7100e = 2; |
| *(uint16_t*)0x20e71010 = 0; |
| *(uint16_t*)0x20e71012 = 2; |
| *(uint16_t*)0x20e71014 = 0; |
| *(uint16_t*)0x20e71016 = 0xa; |
| *(uint16_t*)0x20e71018 = htobe16(0x4e21); |
| *(uint32_t*)0x20e7101a = 3; |
| *(uint8_t*)0x20e7101e = -1; |
| *(uint8_t*)0x20e7101f = 1; |
| *(uint8_t*)0x20e71020 = 0; |
| *(uint8_t*)0x20e71021 = 0; |
| *(uint8_t*)0x20e71022 = 0; |
| *(uint8_t*)0x20e71023 = 0; |
| *(uint8_t*)0x20e71024 = 0; |
| *(uint8_t*)0x20e71025 = 0; |
| *(uint8_t*)0x20e71026 = 0; |
| *(uint8_t*)0x20e71027 = 0; |
| *(uint8_t*)0x20e71028 = 0; |
| *(uint8_t*)0x20e71029 = 0; |
| *(uint8_t*)0x20e7102a = 0; |
| *(uint8_t*)0x20e7102b = 0; |
| *(uint8_t*)0x20e7102c = 0; |
| *(uint8_t*)0x20e7102d = 1; |
| *(uint32_t*)0x20e7102e = 4; |
| syscall(__NR_connect, r[2], 0x20e71000, 0x32); |
| break; |
| case 8: |
| r[3] = syscall(__NR_socket, 0x18, 1, 1); |
| break; |
| case 9: |
| syscall(__NR_close, r[2]); |
| break; |
| case 10: |
| syscall(__NR_dup2, r[3], r[1]); |
| break; |
| } |
| } |
| |
| void test() |
| { |
| memset(r, -1, sizeof(r)); |
| execute(11); |
| collide = 1; |
| execute(11); |
| } |
| |
| int main() |
| { |
| for (;;) { |
| loop(); |
| } |
| } |