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// autogenerated by syzkaller (https://github.com/google/syzkaller)
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#define _GNU_SOURCE
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#include <arpa/inet.h>
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#include <dirent.h>
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#include <endian.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <net/if.h>
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#include <net/if_arp.h>
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#include <netinet/in.h>
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#include <sched.h>
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#include <setjmp.h>
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#include <signal.h>
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#include <stdarg.h>
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#include <stdbool.h>
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#include <stdint.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/ioctl.h>
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#include <sys/mount.h>
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#include <sys/prctl.h>
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#include <sys/resource.h>
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#include <sys/socket.h>
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#include <sys/stat.h>
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#include <sys/syscall.h>
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#include <sys/time.h>
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#include <sys/types.h>
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#include <sys/uio.h>
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#include <sys/wait.h>
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#include <time.h>
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#include <unistd.h>
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#include <linux/if_addr.h>
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#include <linux/if_ether.h>
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#include <linux/if_link.h>
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#include <linux/if_tun.h>
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#include <linux/in6.h>
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#include <linux/ip.h>
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#include <linux/neighbour.h>
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#include <linux/net.h>
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#include <linux/netlink.h>
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#include <linux/rtnetlink.h>
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#include <linux/tcp.h>
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#include <linux/veth.h>
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unsigned long long procid;
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static __thread int skip_segv;
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static __thread jmp_buf segv_env;
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static void segv_handler(int sig, siginfo_t* info, void* ctx)
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{
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uintptr_t addr = (uintptr_t)info->si_addr;
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const uintptr_t prog_start = 1 << 20;
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const uintptr_t prog_end = 100 << 20;
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if (__atomic_load_n(&skip_segv, __ATOMIC_RELAXED) &&
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(addr < prog_start || addr > prog_end)) {
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_longjmp(segv_env, 1);
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}
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exit(sig);
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}
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static void install_segv_handler(void)
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{
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struct sigaction sa;
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memset(&sa, 0, sizeof(sa));
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sa.sa_handler = SIG_IGN;
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syscall(SYS_rt_sigaction, 0x20, &sa, NULL, 8);
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syscall(SYS_rt_sigaction, 0x21, &sa, NULL, 8);
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memset(&sa, 0, sizeof(sa));
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sa.sa_sigaction = segv_handler;
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sa.sa_flags = SA_NODEFER | SA_SIGINFO;
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sigaction(SIGSEGV, &sa, NULL);
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sigaction(SIGBUS, &sa, NULL);
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}
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#define NONFAILING(...) \
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{ \
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__atomic_fetch_add(&skip_segv, 1, __ATOMIC_SEQ_CST); \
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if (_setjmp(segv_env) == 0) { \
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__VA_ARGS__; \
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} \
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__atomic_fetch_sub(&skip_segv, 1, __ATOMIC_SEQ_CST); \
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}
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static void sleep_ms(uint64_t ms)
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{
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usleep(ms * 1000);
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}
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static uint64_t current_time_ms(void)
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{
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struct timespec ts;
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if (clock_gettime(CLOCK_MONOTONIC, &ts))
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exit(1);
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return (uint64_t)ts.tv_sec * 1000 + (uint64_t)ts.tv_nsec / 1000000;
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}
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static void use_temporary_dir(void)
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{
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char tmpdir_template[] = "./syzkaller.XXXXXX";
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char* tmpdir = mkdtemp(tmpdir_template);
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if (!tmpdir)
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exit(1);
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if (chmod(tmpdir, 0777))
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exit(1);
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if (chdir(tmpdir))
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exit(1);
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}
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#define BITMASK(bf_off, bf_len) (((1ull << (bf_len)) - 1) << (bf_off))
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#define STORE_BY_BITMASK(type, htobe, addr, val, bf_off, bf_len) \
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*(type*)(addr) = \
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htobe((htobe(*(type*)(addr)) & ~BITMASK((bf_off), (bf_len))) | \
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(((type)(val) << (bf_off)) & BITMASK((bf_off), (bf_len))))
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static bool write_file(const char* file, const char* what, ...)
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{
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char buf[1024];
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va_list args;
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va_start(args, what);
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vsnprintf(buf, sizeof(buf), what, args);
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va_end(args);
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buf[sizeof(buf) - 1] = 0;
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int len = strlen(buf);
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int fd = open(file, O_WRONLY | O_CLOEXEC);
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if (fd == -1)
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return false;
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if (write(fd, buf, len) != len) {
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int err = errno;
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close(fd);
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errno = err;
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return false;
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}
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close(fd);
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return true;
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}
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static struct {
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char* pos;
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int nesting;
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struct nlattr* nested[8];
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char buf[1024];
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} nlmsg;
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static void netlink_init(int typ, int flags, const void* data, int size)
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{
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memset(&nlmsg, 0, sizeof(nlmsg));
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struct nlmsghdr* hdr = (struct nlmsghdr*)nlmsg.buf;
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hdr->nlmsg_type = typ;
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hdr->nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK | flags;
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memcpy(hdr + 1, data, size);
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nlmsg.pos = (char*)(hdr + 1) + NLMSG_ALIGN(size);
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}
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static void netlink_attr(int typ, const void* data, int size)
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{
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struct nlattr* attr = (struct nlattr*)nlmsg.pos;
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attr->nla_len = sizeof(*attr) + size;
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attr->nla_type = typ;
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memcpy(attr + 1, data, size);
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nlmsg.pos += NLMSG_ALIGN(attr->nla_len);
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}
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static void netlink_nest(int typ)
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{
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struct nlattr* attr = (struct nlattr*)nlmsg.pos;
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attr->nla_type = typ;
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nlmsg.pos += sizeof(*attr);
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nlmsg.nested[nlmsg.nesting++] = attr;
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}
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static void netlink_done(void)
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{
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struct nlattr* attr = nlmsg.nested[--nlmsg.nesting];
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attr->nla_len = nlmsg.pos - (char*)attr;
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}
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static int netlink_send(int sock)
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{
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if (nlmsg.pos > nlmsg.buf + sizeof(nlmsg.buf) || nlmsg.nesting)
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exit(1);
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struct nlmsghdr* hdr = (struct nlmsghdr*)nlmsg.buf;
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hdr->nlmsg_len = nlmsg.pos - nlmsg.buf;
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struct sockaddr_nl addr;
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memset(&addr, 0, sizeof(addr));
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addr.nl_family = AF_NETLINK;
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unsigned n = sendto(sock, nlmsg.buf, hdr->nlmsg_len, 0,
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(struct sockaddr*)&addr, sizeof(addr));
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if (n != hdr->nlmsg_len)
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exit(1);
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n = recv(sock, nlmsg.buf, sizeof(nlmsg.buf), 0);
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if (n < sizeof(struct nlmsghdr) + sizeof(struct nlmsgerr))
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exit(1);
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if (hdr->nlmsg_type != NLMSG_ERROR)
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exit(1);
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return -((struct nlmsgerr*)(hdr + 1))->error;
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}
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static void netlink_add_device_impl(const char* type, const char* name)
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{
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struct ifinfomsg hdr;
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memset(&hdr, 0, sizeof(hdr));
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netlink_init(RTM_NEWLINK, NLM_F_EXCL | NLM_F_CREATE, &hdr, sizeof(hdr));
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if (name)
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netlink_attr(IFLA_IFNAME, name, strlen(name));
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netlink_nest(IFLA_LINKINFO);
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netlink_attr(IFLA_INFO_KIND, type, strlen(type));
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}
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static void netlink_add_device(int sock, const char* type, const char* name)
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{
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netlink_add_device_impl(type, name);
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netlink_done();
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int err = netlink_send(sock);
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(void)err;
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}
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static void netlink_add_veth(int sock, const char* name, const char* peer)
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{
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netlink_add_device_impl("veth", name);
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netlink_nest(IFLA_INFO_DATA);
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netlink_nest(VETH_INFO_PEER);
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nlmsg.pos += sizeof(struct ifinfomsg);
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netlink_attr(IFLA_IFNAME, peer, strlen(peer));
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netlink_done();
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netlink_done();
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netlink_done();
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int err = netlink_send(sock);
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(void)err;
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}
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static void netlink_add_hsr(int sock, const char* name, const char* slave1,
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const char* slave2)
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{
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netlink_add_device_impl("hsr", name);
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netlink_nest(IFLA_INFO_DATA);
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int ifindex1 = if_nametoindex(slave1);
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netlink_attr(IFLA_HSR_SLAVE1, &ifindex1, sizeof(ifindex1));
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int ifindex2 = if_nametoindex(slave2);
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netlink_attr(IFLA_HSR_SLAVE2, &ifindex2, sizeof(ifindex2));
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netlink_done();
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netlink_done();
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int err = netlink_send(sock);
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(void)err;
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}
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static void netlink_device_change(int sock, const char* name, bool up,
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const char* master, const void* mac,
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int macsize)
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{
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struct ifinfomsg hdr;
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memset(&hdr, 0, sizeof(hdr));
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if (up)
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hdr.ifi_flags = hdr.ifi_change = IFF_UP;
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netlink_init(RTM_NEWLINK, 0, &hdr, sizeof(hdr));
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netlink_attr(IFLA_IFNAME, name, strlen(name));
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if (master) {
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int ifindex = if_nametoindex(master);
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netlink_attr(IFLA_MASTER, &ifindex, sizeof(ifindex));
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}
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if (macsize)
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netlink_attr(IFLA_ADDRESS, mac, macsize);
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int err = netlink_send(sock);
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(void)err;
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}
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static int netlink_add_addr(int sock, const char* dev, const void* addr,
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int addrsize)
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{
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struct ifaddrmsg hdr;
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memset(&hdr, 0, sizeof(hdr));
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hdr.ifa_family = addrsize == 4 ? AF_INET : AF_INET6;
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hdr.ifa_prefixlen = addrsize == 4 ? 24 : 120;
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hdr.ifa_scope = RT_SCOPE_UNIVERSE;
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hdr.ifa_index = if_nametoindex(dev);
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netlink_init(RTM_NEWADDR, NLM_F_CREATE | NLM_F_REPLACE, &hdr, sizeof(hdr));
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netlink_attr(IFA_LOCAL, addr, addrsize);
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netlink_attr(IFA_ADDRESS, addr, addrsize);
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return netlink_send(sock);
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}
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static void netlink_add_addr4(int sock, const char* dev, const char* addr)
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{
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struct in_addr in_addr;
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inet_pton(AF_INET, addr, &in_addr);
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int err = netlink_add_addr(sock, dev, &in_addr, sizeof(in_addr));
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(void)err;
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}
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static void netlink_add_addr6(int sock, const char* dev, const char* addr)
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{
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struct in6_addr in6_addr;
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inet_pton(AF_INET6, addr, &in6_addr);
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int err = netlink_add_addr(sock, dev, &in6_addr, sizeof(in6_addr));
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(void)err;
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}
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static void netlink_add_neigh(int sock, const char* name, const void* addr,
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int addrsize, const void* mac, int macsize)
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{
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struct ndmsg hdr;
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memset(&hdr, 0, sizeof(hdr));
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hdr.ndm_family = addrsize == 4 ? AF_INET : AF_INET6;
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hdr.ndm_ifindex = if_nametoindex(name);
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hdr.ndm_state = NUD_PERMANENT;
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netlink_init(RTM_NEWNEIGH, NLM_F_EXCL | NLM_F_CREATE, &hdr, sizeof(hdr));
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netlink_attr(NDA_DST, addr, addrsize);
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netlink_attr(NDA_LLADDR, mac, macsize);
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int err = netlink_send(sock);
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(void)err;
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}
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static int tunfd = -1;
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static int tun_frags_enabled;
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#define SYZ_TUN_MAX_PACKET_SIZE 1000
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#define TUN_IFACE "syz_tun"
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#define LOCAL_MAC 0xaaaaaaaaaaaa
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#define REMOTE_MAC 0xaaaaaaaaaabb
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#define LOCAL_IPV4 "172.20.20.170"
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#define REMOTE_IPV4 "172.20.20.187"
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#define LOCAL_IPV6 "fe80::aa"
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#define REMOTE_IPV6 "fe80::bb"
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#define IFF_NAPI 0x0010
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#define IFF_NAPI_FRAGS 0x0020
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static void initialize_tun(void)
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{
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tunfd = open("/dev/net/tun", O_RDWR | O_NONBLOCK);
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if (tunfd == -1) {
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printf("tun: can't open /dev/net/tun: please enable CONFIG_TUN=y\n");
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printf("otherwise fuzzing or reproducing might not work as intended\n");
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return;
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}
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const int kTunFd = 240;
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if (dup2(tunfd, kTunFd) < 0)
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exit(1);
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close(tunfd);
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tunfd = kTunFd;
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struct ifreq ifr;
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memset(&ifr, 0, sizeof(ifr));
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strncpy(ifr.ifr_name, TUN_IFACE, IFNAMSIZ);
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ifr.ifr_flags = IFF_TAP | IFF_NO_PI | IFF_NAPI | IFF_NAPI_FRAGS;
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if (ioctl(tunfd, TUNSETIFF, (void*)&ifr) < 0) {
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ifr.ifr_flags = IFF_TAP | IFF_NO_PI;
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if (ioctl(tunfd, TUNSETIFF, (void*)&ifr) < 0)
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exit(1);
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}
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if (ioctl(tunfd, TUNGETIFF, (void*)&ifr) < 0)
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exit(1);
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tun_frags_enabled = (ifr.ifr_flags & IFF_NAPI_FRAGS) != 0;
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char sysctl[64];
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sprintf(sysctl, "/proc/sys/net/ipv6/conf/%s/accept_dad", TUN_IFACE);
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write_file(sysctl, "0");
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sprintf(sysctl, "/proc/sys/net/ipv6/conf/%s/router_solicitations", TUN_IFACE);
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write_file(sysctl, "0");
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int sock = socket(AF_NETLINK, SOCK_RAW, NETLINK_ROUTE);
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if (sock == -1)
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exit(1);
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netlink_add_addr4(sock, TUN_IFACE, LOCAL_IPV4);
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netlink_add_addr6(sock, TUN_IFACE, LOCAL_IPV6);
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uint64_t macaddr = REMOTE_MAC;
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struct in_addr in_addr;
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inet_pton(AF_INET, REMOTE_IPV4, &in_addr);
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netlink_add_neigh(sock, TUN_IFACE, &in_addr, sizeof(in_addr), &macaddr,
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ETH_ALEN);
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struct in6_addr in6_addr;
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inet_pton(AF_INET6, REMOTE_IPV6, &in6_addr);
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netlink_add_neigh(sock, TUN_IFACE, &in6_addr, sizeof(in6_addr), &macaddr,
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ETH_ALEN);
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macaddr = LOCAL_MAC;
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netlink_device_change(sock, TUN_IFACE, true, 0, &macaddr, ETH_ALEN);
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close(sock);
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}
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#define DEV_IPV4 "172.20.20.%d"
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#define DEV_IPV6 "fe80::%02x"
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#define DEV_MAC 0x00aaaaaaaaaa
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static void initialize_netdevices(void)
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{
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char netdevsim[16];
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sprintf(netdevsim, "netdevsim%d", (int)procid);
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struct {
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const char* type;
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const char* dev;
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} devtypes[] = {
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{"ip6gretap", "ip6gretap0"}, {"bridge", "bridge0"},
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{"vcan", "vcan0"}, {"bond", "bond0"},
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{"team", "team0"}, {"dummy", "dummy0"},
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{"nlmon", "nlmon0"}, {"caif", "caif0"},
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{"batadv", "batadv0"}, {"vxcan", "vxcan1"},
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{"netdevsim", netdevsim}, {"veth", 0},
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};
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const char* devmasters[] = {"bridge", "bond", "team"};
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struct {
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const char* name;
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int macsize;
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bool noipv6;
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} devices[] = {
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{"lo", ETH_ALEN},
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{"sit0", 0},
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{"bridge0", ETH_ALEN},
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{"vcan0", 0, true},
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{"tunl0", 0},
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{"gre0", 0},
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{"gretap0", ETH_ALEN},
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{"ip_vti0", 0},
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{"ip6_vti0", 0},
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{"ip6tnl0", 0},
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{"ip6gre0", 0},
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{"ip6gretap0", ETH_ALEN},
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{"erspan0", ETH_ALEN},
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{"bond0", ETH_ALEN},
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{"veth0", ETH_ALEN},
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{"veth1", ETH_ALEN},
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{"team0", ETH_ALEN},
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{"veth0_to_bridge", ETH_ALEN},
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{"veth1_to_bridge", ETH_ALEN},
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{"veth0_to_bond", ETH_ALEN},
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{"veth1_to_bond", ETH_ALEN},
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{"veth0_to_team", ETH_ALEN},
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{"veth1_to_team", ETH_ALEN},
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{"veth0_to_hsr", ETH_ALEN},
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{"veth1_to_hsr", ETH_ALEN},
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{"hsr0", 0},
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{"dummy0", ETH_ALEN},
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{"nlmon0", 0},
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{"vxcan1", 0, true},
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{"caif0", ETH_ALEN},
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{"batadv0", ETH_ALEN},
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{netdevsim, ETH_ALEN},
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};
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int sock = socket(AF_NETLINK, SOCK_RAW, NETLINK_ROUTE);
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if (sock == -1)
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exit(1);
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unsigned i;
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for (i = 0; i < sizeof(devtypes) / sizeof(devtypes[0]); i++)
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netlink_add_device(sock, devtypes[i].type, devtypes[i].dev);
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for (i = 0; i < sizeof(devmasters) / (sizeof(devmasters[0])); i++) {
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char master[32], slave0[32], veth0[32], slave1[32], veth1[32];
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sprintf(slave0, "%s_slave_0", devmasters[i]);
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sprintf(veth0, "veth0_to_%s", devmasters[i]);
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netlink_add_veth(sock, slave0, veth0);
|
|
sprintf(slave1, "%s_slave_1", devmasters[i]);
|
|
sprintf(veth1, "veth1_to_%s", devmasters[i]);
|
|
netlink_add_veth(sock, slave1, veth1);
|
|
sprintf(master, "%s0", devmasters[i]);
|
|
netlink_device_change(sock, slave0, false, master, 0, 0);
|
|
netlink_device_change(sock, slave1, false, master, 0, 0);
|
|
}
|
|
netlink_device_change(sock, "bridge_slave_0", true, 0, 0, 0);
|
|
netlink_device_change(sock, "bridge_slave_1", true, 0, 0, 0);
|
|
netlink_add_veth(sock, "hsr_slave_0", "veth0_to_hsr");
|
|
netlink_add_veth(sock, "hsr_slave_1", "veth1_to_hsr");
|
|
netlink_add_hsr(sock, "hsr0", "hsr_slave_0", "hsr_slave_1");
|
|
netlink_device_change(sock, "hsr_slave_0", true, 0, 0, 0);
|
|
netlink_device_change(sock, "hsr_slave_1", true, 0, 0, 0);
|
|
for (i = 0; i < sizeof(devices) / (sizeof(devices[0])); i++) {
|
|
char addr[32];
|
|
sprintf(addr, DEV_IPV4, i + 10);
|
|
netlink_add_addr4(sock, devices[i].name, addr);
|
|
if (!devices[i].noipv6) {
|
|
sprintf(addr, DEV_IPV6, i + 10);
|
|
netlink_add_addr6(sock, devices[i].name, addr);
|
|
}
|
|
uint64_t macaddr = DEV_MAC + ((i + 10ull) << 40);
|
|
netlink_device_change(sock, devices[i].name, true, 0, &macaddr,
|
|
devices[i].macsize);
|
|
}
|
|
close(sock);
|
|
}
|
|
static void initialize_netdevices_init(void)
|
|
{
|
|
int sock = socket(AF_NETLINK, SOCK_RAW, NETLINK_ROUTE);
|
|
if (sock == -1)
|
|
exit(1);
|
|
struct {
|
|
const char* type;
|
|
int macsize;
|
|
bool noipv6;
|
|
bool noup;
|
|
} devtypes[] = {
|
|
{"nr", 7, true}, {"rose", 5, true, true},
|
|
};
|
|
unsigned i;
|
|
for (i = 0; i < sizeof(devtypes) / sizeof(devtypes[0]); i++) {
|
|
char dev[32], addr[32];
|
|
sprintf(dev, "%s%d", devtypes[i].type, (int)procid);
|
|
sprintf(addr, "172.30.%d.%d", i, (int)procid + 1);
|
|
netlink_add_addr4(sock, dev, addr);
|
|
if (!devtypes[i].noipv6) {
|
|
sprintf(addr, "fe88::%02x:%02x", i, (int)procid + 1);
|
|
netlink_add_addr6(sock, dev, addr);
|
|
}
|
|
int macsize = devtypes[i].macsize;
|
|
uint64_t macaddr = 0xbbbbbb +
|
|
((unsigned long long)i << (8 * (macsize - 2))) +
|
|
(procid << (8 * (macsize - 1)));
|
|
netlink_device_change(sock, dev, !devtypes[i].noup, 0, &macaddr, macsize);
|
|
}
|
|
close(sock);
|
|
}
|
|
|
|
static int read_tun(char* data, int size)
|
|
{
|
|
if (tunfd < 0)
|
|
return -1;
|
|
int rv = read(tunfd, data, size);
|
|
if (rv < 0) {
|
|
if (errno == EAGAIN)
|
|
return -1;
|
|
if (errno == EBADFD)
|
|
return -1;
|
|
exit(1);
|
|
}
|
|
return rv;
|
|
}
|
|
|
|
static void flush_tun()
|
|
{
|
|
char data[SYZ_TUN_MAX_PACKET_SIZE];
|
|
while (read_tun(&data[0], sizeof(data)) != -1) {
|
|
}
|
|
}
|
|
|
|
#define XT_TABLE_SIZE 1536
|
|
#define XT_MAX_ENTRIES 10
|
|
|
|
struct xt_counters {
|
|
uint64_t pcnt, bcnt;
|
|
};
|
|
|
|
struct ipt_getinfo {
|
|
char name[32];
|
|
unsigned int valid_hooks;
|
|
unsigned int hook_entry[5];
|
|
unsigned int underflow[5];
|
|
unsigned int num_entries;
|
|
unsigned int size;
|
|
};
|
|
|
|
struct ipt_get_entries {
|
|
char name[32];
|
|
unsigned int size;
|
|
void* entrytable[XT_TABLE_SIZE / sizeof(void*)];
|
|
};
|
|
|
|
struct ipt_replace {
|
|
char name[32];
|
|
unsigned int valid_hooks;
|
|
unsigned int num_entries;
|
|
unsigned int size;
|
|
unsigned int hook_entry[5];
|
|
unsigned int underflow[5];
|
|
unsigned int num_counters;
|
|
struct xt_counters* counters;
|
|
char entrytable[XT_TABLE_SIZE];
|
|
};
|
|
|
|
struct ipt_table_desc {
|
|
const char* name;
|
|
struct ipt_getinfo info;
|
|
struct ipt_replace replace;
|
|
};
|
|
|
|
static struct ipt_table_desc ipv4_tables[] = {
|
|
{.name = "filter"}, {.name = "nat"}, {.name = "mangle"},
|
|
{.name = "raw"}, {.name = "security"},
|
|
};
|
|
|
|
static struct ipt_table_desc ipv6_tables[] = {
|
|
{.name = "filter"}, {.name = "nat"}, {.name = "mangle"},
|
|
{.name = "raw"}, {.name = "security"},
|
|
};
|
|
|
|
#define IPT_BASE_CTL 64
|
|
#define IPT_SO_SET_REPLACE (IPT_BASE_CTL)
|
|
#define IPT_SO_GET_INFO (IPT_BASE_CTL)
|
|
#define IPT_SO_GET_ENTRIES (IPT_BASE_CTL + 1)
|
|
|
|
struct arpt_getinfo {
|
|
char name[32];
|
|
unsigned int valid_hooks;
|
|
unsigned int hook_entry[3];
|
|
unsigned int underflow[3];
|
|
unsigned int num_entries;
|
|
unsigned int size;
|
|
};
|
|
|
|
struct arpt_get_entries {
|
|
char name[32];
|
|
unsigned int size;
|
|
void* entrytable[XT_TABLE_SIZE / sizeof(void*)];
|
|
};
|
|
|
|
struct arpt_replace {
|
|
char name[32];
|
|
unsigned int valid_hooks;
|
|
unsigned int num_entries;
|
|
unsigned int size;
|
|
unsigned int hook_entry[3];
|
|
unsigned int underflow[3];
|
|
unsigned int num_counters;
|
|
struct xt_counters* counters;
|
|
char entrytable[XT_TABLE_SIZE];
|
|
};
|
|
|
|
struct arpt_table_desc {
|
|
const char* name;
|
|
struct arpt_getinfo info;
|
|
struct arpt_replace replace;
|
|
};
|
|
|
|
static struct arpt_table_desc arpt_tables[] = {
|
|
{.name = "filter"},
|
|
};
|
|
|
|
#define ARPT_BASE_CTL 96
|
|
#define ARPT_SO_SET_REPLACE (ARPT_BASE_CTL)
|
|
#define ARPT_SO_GET_INFO (ARPT_BASE_CTL)
|
|
#define ARPT_SO_GET_ENTRIES (ARPT_BASE_CTL + 1)
|
|
|
|
static void checkpoint_iptables(struct ipt_table_desc* tables, int num_tables,
|
|
int family, int level)
|
|
{
|
|
struct ipt_get_entries entries;
|
|
socklen_t optlen;
|
|
int fd, i;
|
|
fd = socket(family, SOCK_STREAM, IPPROTO_TCP);
|
|
if (fd == -1) {
|
|
switch (errno) {
|
|
case EAFNOSUPPORT:
|
|
case ENOPROTOOPT:
|
|
return;
|
|
}
|
|
exit(1);
|
|
}
|
|
for (i = 0; i < num_tables; i++) {
|
|
struct ipt_table_desc* table = &tables[i];
|
|
strcpy(table->info.name, table->name);
|
|
strcpy(table->replace.name, table->name);
|
|
optlen = sizeof(table->info);
|
|
if (getsockopt(fd, level, IPT_SO_GET_INFO, &table->info, &optlen)) {
|
|
switch (errno) {
|
|
case EPERM:
|
|
case ENOENT:
|
|
case ENOPROTOOPT:
|
|
continue;
|
|
}
|
|
exit(1);
|
|
}
|
|
if (table->info.size > sizeof(table->replace.entrytable))
|
|
exit(1);
|
|
if (table->info.num_entries > XT_MAX_ENTRIES)
|
|
exit(1);
|
|
memset(&entries, 0, sizeof(entries));
|
|
strcpy(entries.name, table->name);
|
|
entries.size = table->info.size;
|
|
optlen = sizeof(entries) - sizeof(entries.entrytable) + table->info.size;
|
|
if (getsockopt(fd, level, IPT_SO_GET_ENTRIES, &entries, &optlen))
|
|
exit(1);
|
|
table->replace.valid_hooks = table->info.valid_hooks;
|
|
table->replace.num_entries = table->info.num_entries;
|
|
table->replace.size = table->info.size;
|
|
memcpy(table->replace.hook_entry, table->info.hook_entry,
|
|
sizeof(table->replace.hook_entry));
|
|
memcpy(table->replace.underflow, table->info.underflow,
|
|
sizeof(table->replace.underflow));
|
|
memcpy(table->replace.entrytable, entries.entrytable, table->info.size);
|
|
}
|
|
close(fd);
|
|
}
|
|
|
|
static void reset_iptables(struct ipt_table_desc* tables, int num_tables,
|
|
int family, int level)
|
|
{
|
|
struct xt_counters counters[XT_MAX_ENTRIES];
|
|
struct ipt_get_entries entries;
|
|
struct ipt_getinfo info;
|
|
socklen_t optlen;
|
|
int fd, i;
|
|
fd = socket(family, SOCK_STREAM, IPPROTO_TCP);
|
|
if (fd == -1) {
|
|
switch (errno) {
|
|
case EAFNOSUPPORT:
|
|
case ENOPROTOOPT:
|
|
return;
|
|
}
|
|
exit(1);
|
|
}
|
|
for (i = 0; i < num_tables; i++) {
|
|
struct ipt_table_desc* table = &tables[i];
|
|
if (table->info.valid_hooks == 0)
|
|
continue;
|
|
memset(&info, 0, sizeof(info));
|
|
strcpy(info.name, table->name);
|
|
optlen = sizeof(info);
|
|
if (getsockopt(fd, level, IPT_SO_GET_INFO, &info, &optlen))
|
|
exit(1);
|
|
if (memcmp(&table->info, &info, sizeof(table->info)) == 0) {
|
|
memset(&entries, 0, sizeof(entries));
|
|
strcpy(entries.name, table->name);
|
|
entries.size = table->info.size;
|
|
optlen = sizeof(entries) - sizeof(entries.entrytable) + entries.size;
|
|
if (getsockopt(fd, level, IPT_SO_GET_ENTRIES, &entries, &optlen))
|
|
exit(1);
|
|
if (memcmp(table->replace.entrytable, entries.entrytable,
|
|
table->info.size) == 0)
|
|
continue;
|
|
}
|
|
table->replace.num_counters = info.num_entries;
|
|
table->replace.counters = counters;
|
|
optlen = sizeof(table->replace) - sizeof(table->replace.entrytable) +
|
|
table->replace.size;
|
|
if (setsockopt(fd, level, IPT_SO_SET_REPLACE, &table->replace, optlen))
|
|
exit(1);
|
|
}
|
|
close(fd);
|
|
}
|
|
|
|
static void checkpoint_arptables(void)
|
|
{
|
|
struct arpt_get_entries entries;
|
|
socklen_t optlen;
|
|
unsigned i;
|
|
int fd;
|
|
fd = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
|
|
if (fd == -1) {
|
|
switch (errno) {
|
|
case EAFNOSUPPORT:
|
|
case ENOPROTOOPT:
|
|
return;
|
|
}
|
|
exit(1);
|
|
}
|
|
for (i = 0; i < sizeof(arpt_tables) / sizeof(arpt_tables[0]); i++) {
|
|
struct arpt_table_desc* table = &arpt_tables[i];
|
|
strcpy(table->info.name, table->name);
|
|
strcpy(table->replace.name, table->name);
|
|
optlen = sizeof(table->info);
|
|
if (getsockopt(fd, SOL_IP, ARPT_SO_GET_INFO, &table->info, &optlen)) {
|
|
switch (errno) {
|
|
case EPERM:
|
|
case ENOENT:
|
|
case ENOPROTOOPT:
|
|
continue;
|
|
}
|
|
exit(1);
|
|
}
|
|
if (table->info.size > sizeof(table->replace.entrytable))
|
|
exit(1);
|
|
if (table->info.num_entries > XT_MAX_ENTRIES)
|
|
exit(1);
|
|
memset(&entries, 0, sizeof(entries));
|
|
strcpy(entries.name, table->name);
|
|
entries.size = table->info.size;
|
|
optlen = sizeof(entries) - sizeof(entries.entrytable) + table->info.size;
|
|
if (getsockopt(fd, SOL_IP, ARPT_SO_GET_ENTRIES, &entries, &optlen))
|
|
exit(1);
|
|
table->replace.valid_hooks = table->info.valid_hooks;
|
|
table->replace.num_entries = table->info.num_entries;
|
|
table->replace.size = table->info.size;
|
|
memcpy(table->replace.hook_entry, table->info.hook_entry,
|
|
sizeof(table->replace.hook_entry));
|
|
memcpy(table->replace.underflow, table->info.underflow,
|
|
sizeof(table->replace.underflow));
|
|
memcpy(table->replace.entrytable, entries.entrytable, table->info.size);
|
|
}
|
|
close(fd);
|
|
}
|
|
|
|
static void reset_arptables()
|
|
{
|
|
struct xt_counters counters[XT_MAX_ENTRIES];
|
|
struct arpt_get_entries entries;
|
|
struct arpt_getinfo info;
|
|
socklen_t optlen;
|
|
unsigned i;
|
|
int fd;
|
|
fd = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
|
|
if (fd == -1) {
|
|
switch (errno) {
|
|
case EAFNOSUPPORT:
|
|
case ENOPROTOOPT:
|
|
return;
|
|
}
|
|
exit(1);
|
|
}
|
|
for (i = 0; i < sizeof(arpt_tables) / sizeof(arpt_tables[0]); i++) {
|
|
struct arpt_table_desc* table = &arpt_tables[i];
|
|
if (table->info.valid_hooks == 0)
|
|
continue;
|
|
memset(&info, 0, sizeof(info));
|
|
strcpy(info.name, table->name);
|
|
optlen = sizeof(info);
|
|
if (getsockopt(fd, SOL_IP, ARPT_SO_GET_INFO, &info, &optlen))
|
|
exit(1);
|
|
if (memcmp(&table->info, &info, sizeof(table->info)) == 0) {
|
|
memset(&entries, 0, sizeof(entries));
|
|
strcpy(entries.name, table->name);
|
|
entries.size = table->info.size;
|
|
optlen = sizeof(entries) - sizeof(entries.entrytable) + entries.size;
|
|
if (getsockopt(fd, SOL_IP, ARPT_SO_GET_ENTRIES, &entries, &optlen))
|
|
exit(1);
|
|
if (memcmp(table->replace.entrytable, entries.entrytable,
|
|
table->info.size) == 0)
|
|
continue;
|
|
} else {
|
|
}
|
|
table->replace.num_counters = info.num_entries;
|
|
table->replace.counters = counters;
|
|
optlen = sizeof(table->replace) - sizeof(table->replace.entrytable) +
|
|
table->replace.size;
|
|
if (setsockopt(fd, SOL_IP, ARPT_SO_SET_REPLACE, &table->replace, optlen))
|
|
exit(1);
|
|
}
|
|
close(fd);
|
|
}
|
|
|
|
#define NF_BR_NUMHOOKS 6
|
|
#define EBT_TABLE_MAXNAMELEN 32
|
|
#define EBT_CHAIN_MAXNAMELEN 32
|
|
#define EBT_BASE_CTL 128
|
|
#define EBT_SO_SET_ENTRIES (EBT_BASE_CTL)
|
|
#define EBT_SO_GET_INFO (EBT_BASE_CTL)
|
|
#define EBT_SO_GET_ENTRIES (EBT_SO_GET_INFO + 1)
|
|
#define EBT_SO_GET_INIT_INFO (EBT_SO_GET_ENTRIES + 1)
|
|
#define EBT_SO_GET_INIT_ENTRIES (EBT_SO_GET_INIT_INFO + 1)
|
|
|
|
struct ebt_replace {
|
|
char name[EBT_TABLE_MAXNAMELEN];
|
|
unsigned int valid_hooks;
|
|
unsigned int nentries;
|
|
unsigned int entries_size;
|
|
struct ebt_entries* hook_entry[NF_BR_NUMHOOKS];
|
|
unsigned int num_counters;
|
|
struct ebt_counter* counters;
|
|
char* entries;
|
|
};
|
|
|
|
struct ebt_entries {
|
|
unsigned int distinguisher;
|
|
char name[EBT_CHAIN_MAXNAMELEN];
|
|
unsigned int counter_offset;
|
|
int policy;
|
|
unsigned int nentries;
|
|
char data[0] __attribute__((aligned(__alignof__(struct ebt_replace))));
|
|
};
|
|
|
|
struct ebt_table_desc {
|
|
const char* name;
|
|
struct ebt_replace replace;
|
|
char entrytable[XT_TABLE_SIZE];
|
|
};
|
|
|
|
static struct ebt_table_desc ebt_tables[] = {
|
|
{.name = "filter"}, {.name = "nat"}, {.name = "broute"},
|
|
};
|
|
|
|
static void checkpoint_ebtables(void)
|
|
{
|
|
socklen_t optlen;
|
|
unsigned i;
|
|
int fd;
|
|
fd = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
|
|
if (fd == -1) {
|
|
switch (errno) {
|
|
case EAFNOSUPPORT:
|
|
case ENOPROTOOPT:
|
|
return;
|
|
}
|
|
exit(1);
|
|
}
|
|
for (i = 0; i < sizeof(ebt_tables) / sizeof(ebt_tables[0]); i++) {
|
|
struct ebt_table_desc* table = &ebt_tables[i];
|
|
strcpy(table->replace.name, table->name);
|
|
optlen = sizeof(table->replace);
|
|
if (getsockopt(fd, SOL_IP, EBT_SO_GET_INIT_INFO, &table->replace,
|
|
&optlen)) {
|
|
switch (errno) {
|
|
case EPERM:
|
|
case ENOENT:
|
|
case ENOPROTOOPT:
|
|
continue;
|
|
}
|
|
exit(1);
|
|
}
|
|
if (table->replace.entries_size > sizeof(table->entrytable))
|
|
exit(1);
|
|
table->replace.num_counters = 0;
|
|
table->replace.entries = table->entrytable;
|
|
optlen = sizeof(table->replace) + table->replace.entries_size;
|
|
if (getsockopt(fd, SOL_IP, EBT_SO_GET_INIT_ENTRIES, &table->replace,
|
|
&optlen))
|
|
exit(1);
|
|
}
|
|
close(fd);
|
|
}
|
|
|
|
static void reset_ebtables()
|
|
{
|
|
struct ebt_replace replace;
|
|
char entrytable[XT_TABLE_SIZE];
|
|
socklen_t optlen;
|
|
unsigned i, j, h;
|
|
int fd;
|
|
fd = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
|
|
if (fd == -1) {
|
|
switch (errno) {
|
|
case EAFNOSUPPORT:
|
|
case ENOPROTOOPT:
|
|
return;
|
|
}
|
|
exit(1);
|
|
}
|
|
for (i = 0; i < sizeof(ebt_tables) / sizeof(ebt_tables[0]); i++) {
|
|
struct ebt_table_desc* table = &ebt_tables[i];
|
|
if (table->replace.valid_hooks == 0)
|
|
continue;
|
|
memset(&replace, 0, sizeof(replace));
|
|
strcpy(replace.name, table->name);
|
|
optlen = sizeof(replace);
|
|
if (getsockopt(fd, SOL_IP, EBT_SO_GET_INFO, &replace, &optlen))
|
|
exit(1);
|
|
replace.num_counters = 0;
|
|
table->replace.entries = 0;
|
|
for (h = 0; h < NF_BR_NUMHOOKS; h++)
|
|
table->replace.hook_entry[h] = 0;
|
|
if (memcmp(&table->replace, &replace, sizeof(table->replace)) == 0) {
|
|
memset(&entrytable, 0, sizeof(entrytable));
|
|
replace.entries = entrytable;
|
|
optlen = sizeof(replace) + replace.entries_size;
|
|
if (getsockopt(fd, SOL_IP, EBT_SO_GET_ENTRIES, &replace, &optlen))
|
|
exit(1);
|
|
if (memcmp(table->entrytable, entrytable, replace.entries_size) == 0)
|
|
continue;
|
|
}
|
|
for (j = 0, h = 0; h < NF_BR_NUMHOOKS; h++) {
|
|
if (table->replace.valid_hooks & (1 << h)) {
|
|
table->replace.hook_entry[h] =
|
|
(struct ebt_entries*)table->entrytable + j;
|
|
j++;
|
|
}
|
|
}
|
|
table->replace.entries = table->entrytable;
|
|
optlen = sizeof(table->replace) + table->replace.entries_size;
|
|
if (setsockopt(fd, SOL_IP, EBT_SO_SET_ENTRIES, &table->replace, optlen))
|
|
exit(1);
|
|
}
|
|
close(fd);
|
|
}
|
|
|
|
static void checkpoint_net_namespace(void)
|
|
{
|
|
checkpoint_ebtables();
|
|
checkpoint_arptables();
|
|
checkpoint_iptables(ipv4_tables, sizeof(ipv4_tables) / sizeof(ipv4_tables[0]),
|
|
AF_INET, SOL_IP);
|
|
checkpoint_iptables(ipv6_tables, sizeof(ipv6_tables) / sizeof(ipv6_tables[0]),
|
|
AF_INET6, SOL_IPV6);
|
|
}
|
|
|
|
static void reset_net_namespace(void)
|
|
{
|
|
reset_ebtables();
|
|
reset_arptables();
|
|
reset_iptables(ipv4_tables, sizeof(ipv4_tables) / sizeof(ipv4_tables[0]),
|
|
AF_INET, SOL_IP);
|
|
reset_iptables(ipv6_tables, sizeof(ipv6_tables) / sizeof(ipv6_tables[0]),
|
|
AF_INET6, SOL_IPV6);
|
|
}
|
|
|
|
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)) {
|
|
}
|
|
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")) {
|
|
}
|
|
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_cgroups_loop()
|
|
{
|
|
int pid = getpid();
|
|
char file[128];
|
|
char cgroupdir[64];
|
|
snprintf(cgroupdir, sizeof(cgroupdir), "/syzcgroup/unified/syz%llu", procid);
|
|
if (mkdir(cgroupdir, 0777)) {
|
|
}
|
|
snprintf(file, sizeof(file), "%s/pids.max", cgroupdir);
|
|
write_file(file, "32");
|
|
snprintf(file, sizeof(file), "%s/memory.low", cgroupdir);
|
|
write_file(file, "%d", 298 << 20);
|
|
snprintf(file, sizeof(file), "%s/memory.high", cgroupdir);
|
|
write_file(file, "%d", 299 << 20);
|
|
snprintf(file, sizeof(file), "%s/memory.max", cgroupdir);
|
|
write_file(file, "%d", 300 << 20);
|
|
snprintf(file, sizeof(file), "%s/cgroup.procs", cgroupdir);
|
|
write_file(file, "%d", pid);
|
|
snprintf(cgroupdir, sizeof(cgroupdir), "/syzcgroup/cpu/syz%llu", procid);
|
|
if (mkdir(cgroupdir, 0777)) {
|
|
}
|
|
snprintf(file, sizeof(file), "%s/cgroup.procs", cgroupdir);
|
|
write_file(file, "%d", pid);
|
|
snprintf(cgroupdir, sizeof(cgroupdir), "/syzcgroup/net/syz%llu", procid);
|
|
if (mkdir(cgroupdir, 0777)) {
|
|
}
|
|
snprintf(file, sizeof(file), "%s/cgroup.procs", cgroupdir);
|
|
write_file(file, "%d", pid);
|
|
}
|
|
|
|
static void setup_cgroups_test()
|
|
{
|
|
char cgroupdir[64];
|
|
snprintf(cgroupdir, sizeof(cgroupdir), "/syzcgroup/unified/syz%llu", procid);
|
|
if (symlink(cgroupdir, "./cgroup")) {
|
|
}
|
|
snprintf(cgroupdir, sizeof(cgroupdir), "/syzcgroup/cpu/syz%llu", procid);
|
|
if (symlink(cgroupdir, "./cgroup.cpu")) {
|
|
}
|
|
snprintf(cgroupdir, sizeof(cgroupdir), "/syzcgroup/net/syz%llu", procid);
|
|
if (symlink(cgroupdir, "./cgroup.net")) {
|
|
}
|
|
}
|
|
|
|
static void setup_common()
|
|
{
|
|
if (mount(0, "/sys/fs/fuse/connections", "fusectl", 0, 0)) {
|
|
}
|
|
setup_cgroups();
|
|
}
|
|
|
|
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 int do_sandbox_none(void)
|
|
{
|
|
if (unshare(CLONE_NEWPID)) {
|
|
}
|
|
int pid = fork();
|
|
if (pid != 0)
|
|
return wait_for_loop(pid);
|
|
setup_common();
|
|
sandbox_common();
|
|
initialize_netdevices_init();
|
|
if (unshare(CLONE_NEWNET)) {
|
|
}
|
|
initialize_tun();
|
|
initialize_netdevices();
|
|
loop();
|
|
exit(1);
|
|
}
|
|
|
|
#define FS_IOC_SETFLAGS _IOW('f', 2, long)
|
|
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) {
|
|
exit(1);
|
|
}
|
|
exit(1);
|
|
}
|
|
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))
|
|
exit(1);
|
|
if (S_ISDIR(st.st_mode)) {
|
|
remove_dir(filename);
|
|
continue;
|
|
}
|
|
int i;
|
|
for (i = 0;; i++) {
|
|
if (unlink(filename) == 0)
|
|
break;
|
|
if (errno == EPERM) {
|
|
int fd = open(filename, O_RDONLY);
|
|
if (fd != -1) {
|
|
long flags = 0;
|
|
if (ioctl(fd, FS_IOC_SETFLAGS, &flags) == 0)
|
|
close(fd);
|
|
continue;
|
|
}
|
|
}
|
|
if (errno == EROFS) {
|
|
break;
|
|
}
|
|
if (errno != EBUSY || i > 100)
|
|
exit(1);
|
|
if (umount2(filename, MNT_DETACH))
|
|
exit(1);
|
|
}
|
|
}
|
|
closedir(dp);
|
|
int i;
|
|
for (i = 0;; i++) {
|
|
if (rmdir(dir) == 0)
|
|
break;
|
|
if (i < 100) {
|
|
if (errno == EPERM) {
|
|
int fd = open(dir, O_RDONLY);
|
|
if (fd != -1) {
|
|
long flags = 0;
|
|
if (ioctl(fd, FS_IOC_SETFLAGS, &flags) == 0)
|
|
close(fd);
|
|
continue;
|
|
}
|
|
}
|
|
if (errno == EROFS) {
|
|
break;
|
|
}
|
|
if (errno == EBUSY) {
|
|
if (umount2(dir, MNT_DETACH))
|
|
exit(1);
|
|
continue;
|
|
}
|
|
if (errno == ENOTEMPTY) {
|
|
if (iter < 100) {
|
|
iter++;
|
|
goto retry;
|
|
}
|
|
}
|
|
}
|
|
exit(1);
|
|
}
|
|
}
|
|
|
|
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) {
|
|
}
|
|
}
|
|
|
|
static void setup_loop()
|
|
{
|
|
setup_cgroups_loop();
|
|
checkpoint_net_namespace();
|
|
}
|
|
|
|
static void reset_loop()
|
|
{
|
|
reset_net_namespace();
|
|
}
|
|
|
|
static void setup_test()
|
|
{
|
|
prctl(PR_SET_PDEATHSIG, SIGKILL, 0, 0, 0);
|
|
setpgrp();
|
|
setup_cgroups_test();
|
|
write_file("/proc/self/oom_score_adj", "1000");
|
|
flush_tun();
|
|
}
|
|
|
|
static void close_fds()
|
|
{
|
|
int fd;
|
|
for (fd = 3; fd < 30; fd++)
|
|
close(fd);
|
|
}
|
|
|
|
#define KMEMLEAK_FILE "/sys/kernel/debug/kmemleak"
|
|
|
|
static void setup_leak()
|
|
{
|
|
if (!write_file(KMEMLEAK_FILE, "scan"))
|
|
exit(1);
|
|
sleep(5);
|
|
if (!write_file(KMEMLEAK_FILE, "scan"))
|
|
exit(1);
|
|
if (!write_file(KMEMLEAK_FILE, "clear"))
|
|
exit(1);
|
|
}
|
|
|
|
static void check_leaks(void)
|
|
{
|
|
int fd = open(KMEMLEAK_FILE, O_RDWR);
|
|
if (fd == -1)
|
|
exit(1);
|
|
uint64_t start = current_time_ms();
|
|
if (write(fd, "scan", 4) != 4)
|
|
exit(1);
|
|
sleep(1);
|
|
while (current_time_ms() - start < 4 * 1000)
|
|
sleep(1);
|
|
if (write(fd, "scan", 4) != 4)
|
|
exit(1);
|
|
static char buf[128 << 10];
|
|
ssize_t n = read(fd, buf, sizeof(buf) - 1);
|
|
if (n < 0)
|
|
exit(1);
|
|
if (n != 0) {
|
|
sleep(1);
|
|
if (write(fd, "scan", 4) != 4)
|
|
exit(1);
|
|
if (lseek(fd, 0, SEEK_SET) < 0)
|
|
exit(1);
|
|
n = read(fd, buf, sizeof(buf) - 1);
|
|
if (n < 0)
|
|
exit(1);
|
|
buf[n] = 0;
|
|
char* pos = buf;
|
|
char* end = buf + n;
|
|
while (pos < end) {
|
|
char* next = strstr(pos + 1, "unreferenced object");
|
|
if (!next)
|
|
next = end;
|
|
char prev = *next;
|
|
*next = 0;
|
|
fprintf(stderr, "BUG: memory leak\n%s\n", pos);
|
|
*next = prev;
|
|
pos = next;
|
|
}
|
|
}
|
|
if (write(fd, "clear", 5) != 5)
|
|
exit(1);
|
|
close(fd);
|
|
}
|
|
|
|
static void setup_binfmt_misc()
|
|
{
|
|
if (mount(0, "/proc/sys/fs/binfmt_misc", "binfmt_misc", 0, 0)) {
|
|
}
|
|
write_file("/proc/sys/fs/binfmt_misc/register", ":syz0:M:0:\x01::./file0:");
|
|
write_file("/proc/sys/fs/binfmt_misc/register",
|
|
":syz1:M:1:\x02::./file0:POC");
|
|
}
|
|
|
|
static void execute_one(void);
|
|
|
|
#define WAIT_FLAGS __WALL
|
|
|
|
static void loop(void)
|
|
{
|
|
setup_loop();
|
|
int iter;
|
|
for (iter = 0;; iter++) {
|
|
char cwdbuf[32];
|
|
sprintf(cwdbuf, "./%d", iter);
|
|
if (mkdir(cwdbuf, 0777))
|
|
exit(1);
|
|
reset_loop();
|
|
int pid = fork();
|
|
if (pid < 0)
|
|
exit(1);
|
|
if (pid == 0) {
|
|
if (chdir(cwdbuf))
|
|
exit(1);
|
|
setup_test();
|
|
execute_one();
|
|
close_fds();
|
|
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;
|
|
}
|
|
remove_dir(cwdbuf);
|
|
check_leaks();
|
|
}
|
|
}
|
|
|
|
uint64_t r[1] = {0xffffffffffffffff};
|
|
|
|
void execute_one(void)
|
|
{
|
|
intptr_t res = 0;
|
|
NONFAILING(memcpy((void*)0x20000180, "memory.events\000", 14));
|
|
syscall(__NR_openat, 0xffffff9c, 0x20000180, 0x26e1, 0);
|
|
NONFAILING(memcpy((void*)0x20000140, "memory.events\000", 14));
|
|
res = syscall(__NR_openat, 0xffffff9c, 0x20000140, 0x7a05, 0x1700);
|
|
if (res != -1)
|
|
r[0] = res;
|
|
NONFAILING(*(uint32_t*)0x20000040 = -1);
|
|
NONFAILING(*(uint32_t*)0x20000044 = 0x70);
|
|
NONFAILING(*(uint8_t*)0x20000048 = 0);
|
|
NONFAILING(*(uint8_t*)0x20000049 = 0x38);
|
|
NONFAILING(*(uint8_t*)0x2000004a = 0);
|
|
NONFAILING(*(uint8_t*)0x2000004b = 0);
|
|
NONFAILING(*(uint32_t*)0x2000004c = 0);
|
|
NONFAILING(*(uint64_t*)0x20000050 = 0x7fffffff);
|
|
NONFAILING(*(uint64_t*)0x20000058 = 0);
|
|
NONFAILING(*(uint64_t*)0x20000060 = 0);
|
|
NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x20000068, 0, 0, 1));
|
|
NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x20000068, 0, 1, 1));
|
|
NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x20000068, 0, 2, 1));
|
|
NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x20000068, 0, 3, 1));
|
|
NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x20000068, 0, 4, 1));
|
|
NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x20000068, 0, 5, 1));
|
|
NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x20000068, 0, 6, 1));
|
|
NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x20000068, 0, 7, 1));
|
|
NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x20000068, 0, 8, 1));
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NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x20000068, 0, 9, 1));
|
|
NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x20000068, 0, 10, 1));
|
|
NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x20000068, 0, 11, 1));
|
|
NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x20000068, 0, 12, 1));
|
|
NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x20000068, 0, 13, 1));
|
|
NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x20000068, 0, 14, 1));
|
|
NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x20000068, 0, 15, 2));
|
|
NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x20000068, 0, 17, 1));
|
|
NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x20000068, 0, 18, 1));
|
|
NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x20000068, 0, 19, 1));
|
|
NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x20000068, 0, 20, 1));
|
|
NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x20000068, 0, 21, 1));
|
|
NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x20000068, 0, 22, 1));
|
|
NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x20000068, 0, 23, 1));
|
|
NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x20000068, 0, 24, 1));
|
|
NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x20000068, 0, 25, 1));
|
|
NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x20000068, 0, 26, 1));
|
|
NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x20000068, 0, 27, 1));
|
|
NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x20000068, 0, 28, 1));
|
|
NONFAILING(STORE_BY_BITMASK(uint64_t, , 0x20000068, 0, 29, 35));
|
|
NONFAILING(*(uint32_t*)0x20000070 = 0);
|
|
NONFAILING(*(uint32_t*)0x20000074 = 0);
|
|
NONFAILING(*(uint64_t*)0x20000078 = 0);
|
|
NONFAILING(*(uint64_t*)0x20000080 = 0);
|
|
NONFAILING(*(uint64_t*)0x20000088 = 0);
|
|
NONFAILING(*(uint64_t*)0x20000090 = 0);
|
|
NONFAILING(*(uint32_t*)0x20000098 = 0);
|
|
NONFAILING(*(uint32_t*)0x2000009c = 0);
|
|
NONFAILING(*(uint64_t*)0x200000a0 = 0);
|
|
NONFAILING(*(uint32_t*)0x200000a8 = 0);
|
|
NONFAILING(*(uint16_t*)0x200000ac = 0);
|
|
NONFAILING(*(uint16_t*)0x200000ae = 0);
|
|
syscall(__NR_perf_event_open, 0x20000040, 0, 0, -1, 0);
|
|
NONFAILING(*(uint64_t*)0x20000040 = 0);
|
|
syscall(__NR_ioctl, r[0], 0x4030582a, 0x20000040);
|
|
}
|
|
int main(void)
|
|
{
|
|
syscall(__NR_mmap, 0x20000000, 0x1000000, 3, 0x32, -1, 0);
|
|
setup_binfmt_misc();
|
|
setup_leak();
|
|
install_segv_handler();
|
|
for (procid = 0; procid < 8; procid++) {
|
|
if (fork() == 0) {
|
|
use_temporary_dir();
|
|
do_sandbox_none();
|
|
}
|
|
}
|
|
sleep(1000000);
|
|
return 0;
|
|
}
|