| // general protection fault in sg_read |
| // https://syzkaller.appspot.com/bug?id=4522c4fb3896c243a66d4bda935f828e80899c2c |
| // status:open |
| // autogenerated by syzkaller (http://github.com/google/syzkaller) |
| |
| #define _GNU_SOURCE |
| #include <endian.h> |
| #include <errno.h> |
| #include <fcntl.h> |
| #include <linux/futex.h> |
| #include <pthread.h> |
| #include <sched.h> |
| #include <signal.h> |
| #include <stdarg.h> |
| #include <stdbool.h> |
| #include <stdio.h> |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <string.h> |
| #include <sys/prctl.h> |
| #include <sys/resource.h> |
| #include <sys/stat.h> |
| #include <sys/syscall.h> |
| #include <sys/time.h> |
| #include <sys/wait.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 <string.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 uintptr_t syz_open_dev(uintptr_t a0, uintptr_t a1, uintptr_t a2) |
| { |
| if (a0 == 0xc || a0 == 0xb) { |
| char buf[128]; |
| sprintf(buf, "/dev/%s/%d:%d", a0 == 0xc ? "char" : "block", (uint8_t)a1, |
| (uint8_t)a2); |
| return open(buf, O_RDWR, 0); |
| } else { |
| char buf[1024]; |
| char* hash; |
| strncpy(buf, (char*)a0, sizeof(buf)); |
| buf[sizeof(buf) - 1] = 0; |
| while ((hash = strchr(buf, '#'))) { |
| *hash = '0' + (char)(a1 % 10); |
| a1 /= 10; |
| } |
| return open(buf, a2, 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 = 128 << 20; |
| setrlimit(RLIMIT_AS, &rlim); |
| rlim.rlim_cur = rlim.rlim_max = 8 << 20; |
| setrlimit(RLIMIT_MEMLOCK, &rlim); |
| rlim.rlim_cur = rlim.rlim_max = 1 << 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); |
| |
| #define CLONE_NEWCGROUP 0x02000000 |
| |
| if (unshare(CLONE_NEWNS)) { |
| } |
| if (unshare(CLONE_NEWIPC)) { |
| } |
| if (unshare(CLONE_NEWCGROUP)) { |
| } |
| if (unshare(CLONE_NEWUTS)) { |
| } |
| if (unshare(CLONE_SYSVSEM)) { |
| } |
| } |
| |
| static int do_sandbox_none(void) |
| { |
| if (unshare(CLONE_NEWPID)) { |
| } |
| int pid = fork(); |
| if (pid < 0) |
| fail("sandbox fork failed"); |
| if (pid) |
| return pid; |
| |
| sandbox_common(); |
| if (unshare(CLONE_NEWNET)) { |
| } |
| |
| loop(); |
| doexit(1); |
| } |
| |
| 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 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); |
| 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; |
| } |
| } |
| } |
| } |
| |
| uint64_t r[1] = {0xffffffffffffffff}; |
| uint64_t procid; |
| void execute_call(int call) |
| { |
| long res; |
| switch (call) { |
| case 0: |
| memcpy((void*)0x20265ff7, "/dev/sg#", 9); |
| res = syz_open_dev(0x20265ff7, 0, 2); |
| if (res != -1) |
| r[0] = res; |
| break; |
| case 1: |
| syscall(__NR_read, r[0], 0x20000000, 0x9a); |
| break; |
| case 2: |
| *(uint16_t*)0x200006c0 = 0; |
| *(uint16_t*)0x200006c2 = htobe16(0x88f8); |
| *(uint16_t*)0x200006c4 = htobe16(-1); |
| *(uint16_t*)0x200006c6 = htobe16(0x108); |
| *(uint8_t*)0x200006c8 = 0; |
| *(uint8_t*)0x200006c9 = 5; |
| *(uint32_t*)0x200006ca = htobe32(-1); |
| *(uint8_t*)0x200006ce = 0; |
| *(uint8_t*)0x200006cf = 0; |
| *(uint8_t*)0x200006d0 = 0; |
| *(uint8_t*)0x200006d1 = 0; |
| *(uint8_t*)0x200006d2 = 0; |
| *(uint8_t*)0x200006d3 = 0; |
| *(uint16_t*)0x200006d4 = htobe16(-1); |
| *(uint32_t*)0x200006d6 = htobe32(-1); |
| *(uint8_t*)0x200006da = 0; |
| *(uint8_t*)0x200006db = 0; |
| *(uint8_t*)0x200006dc = 0; |
| *(uint8_t*)0x200006dd = 0; |
| *(uint8_t*)0x200006de = 0; |
| *(uint8_t*)0x200006df = 0; |
| *(uint16_t*)0x200006e0 = htobe16(3); |
| memcpy((void*)0x200006e2, |
| "\xc1\xd0\x9f\xb2\xab\xa8\xfd\x23\xcc\x72\x9b\xff\xb3\x7a\x4d\x96" |
| "\x60\xb6\x9f\x0b\x7c\x64\x18\x77\x9e\x4d\x5c\x9b\x19\x23\x97\x03" |
| "\x62\xbc\x23\xa7\xb3\x00\x92\x94\xd9\x50\x10\x5b\x03\x02\x11\xe3" |
| "\xa6\x4c\x62\xdd\xe9\x83\xcf\xbb\xde\x09\xeb\xa8\x73\xca\x94\x51" |
| "\x04\xdd\x3e\xab\x8a\x25\xb9\xd9\xcd\x6b\x6b\x2a\x2e\x51\x5b\x6c" |
| "\x07\x45\x2a\xb2\x75\xcf\xfc\x24\x95\x37\xcb\x1c\x36\x9e\x91\x98" |
| "\x5b\x2e\x1e\xe7\x02\x7d\xe3\x65\x9a\xa4\x0c\xba\x3c\x2a\x3e\xef" |
| "\x5b\xc1\xee\x32\xdf\xde\x10\xd8\x1c\xb6\xdf\x65\xa4\x6e\x31\xcd" |
| "\x75\xa1\x1b\x90\xd6\x82\xa5\xfd\xcb\x40\x26\x22\x64\xc2\x5b\x2a" |
| "\xca\xb8\x54\x72\xe8\xea\x8b\x92\xa8\xa8\x41\xf2\x77\x05\x06\xcb" |
| "\xd3\xa9\xff\xea\xa2\x22\xcd\x47\x03\xa1\x1e\x6b\x1b\xd9\xb6\xf1" |
| "\x20\xde\x14\xc1\x63\x1c\x20\x05\x81\xc4\x9e\x59\x63\xd9\x64\x67" |
| "\x8c\xba\x6c\x17\xce\xc0\x4d\x26\x3c\xc2\xf0\x69\x80\x7d\x2b\xc4" |
| "\x90\x60\x45\x52\xa2\x01\xb1\xd2\x5e\x27\xc3\x66\x58\xd9\xfc\x8c" |
| "\x5b\xfb\xa9\xca\x93\xbe\xbb\xe7\xe1\xa5", |
| 234); |
| syscall(__NR_write, r[0], 0x200006c0, 0x10c); |
| break; |
| } |
| } |
| |
| void test() |
| { |
| execute(3); |
| } |
| |
| int main() |
| { |
| syscall(__NR_mmap, 0x20000000, 0x1000000, 3, 0x32, -1, 0); |
| for (procid = 0; procid < 8; procid++) { |
| if (fork() == 0) { |
| for (;;) { |
| int pid = do_sandbox_none(); |
| int status = 0; |
| while (waitpid(pid, &status, __WALL) != pid) { |
| } |
| } |
| } |
| } |
| sleep(1000000); |
| return 0; |
| } |