| // WARNING in kill_block_super |
| // https://syzkaller.appspot.com/bug?id=588996a25a2587be2e3a54e8646728fb9cae44e7 |
| // status:fixed |
| // autogenerated by syzkaller (http://github.com/google/syzkaller) |
| |
| #define _GNU_SOURCE |
| #include <dirent.h> |
| #include <endian.h> |
| #include <errno.h> |
| #include <errno.h> |
| #include <errno.h> |
| #include <errno.h> |
| #include <fcntl.h> |
| #include <fcntl.h> |
| #include <fcntl.h> |
| #include <fcntl.h> |
| #include <linux/net.h> |
| #include <netinet/in.h> |
| #include <sched.h> |
| #include <signal.h> |
| #include <signal.h> |
| #include <stdarg.h> |
| #include <stdarg.h> |
| #include <stdarg.h> |
| #include <stdbool.h> |
| #include <stdbool.h> |
| #include <stdio.h> |
| #include <stdio.h> |
| #include <stdio.h> |
| #include <stdio.h> |
| #include <stdio.h> |
| #include <string.h> |
| #include <sys/mount.h> |
| #include <sys/mount.h> |
| #include <sys/prctl.h> |
| #include <sys/prctl.h> |
| #include <sys/resource.h> |
| #include <sys/socket.h> |
| #include <sys/stat.h> |
| #include <sys/stat.h> |
| #include <sys/stat.h> |
| #include <sys/stat.h> |
| #include <sys/syscall.h> |
| #include <sys/sysmacros.h> |
| #include <sys/time.h> |
| #include <sys/time.h> |
| #include <sys/types.h> |
| #include <sys/wait.h> |
| #include <sys/wait.h> |
| #include <time.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 <stdlib.h> |
| #include <string.h> |
| #include <sys/stat.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 void exitf(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(kRetryStatus); |
| } |
| |
| #define BITMASK_LEN(type, bf_len) (type)((1ull << (bf_len)) - 1) |
| |
| #define BITMASK_LEN_OFF(type, bf_off, bf_len) \ |
| (type)(BITMASK_LEN(type, (bf_len)) << (bf_off)) |
| |
| #define STORE_BY_BITMASK(type, addr, val, bf_off, bf_len) \ |
| if ((bf_off) == 0 && (bf_len) == 0) { \ |
| *(type*)(addr) = (type)(val); \ |
| } else { \ |
| type new_val = *(type*)(addr); \ |
| new_val &= ~BITMASK_LEN_OFF(type, (bf_off), (bf_len)); \ |
| new_val |= ((type)(val)&BITMASK_LEN(type, (bf_len))) << (bf_off); \ |
| *(type*)(addr) = new_val; \ |
| } |
| |
| static uint64_t current_time_ms() |
| { |
| struct timespec ts; |
| |
| if (clock_gettime(CLOCK_MONOTONIC, &ts)) |
| fail("clock_gettime failed"); |
| return (uint64_t)ts.tv_sec * 1000 + (uint64_t)ts.tv_nsec / 1000000; |
| } |
| |
| static void use_temporary_dir() |
| { |
| char tmpdir_template[] = "./syzkaller.XXXXXX"; |
| char* tmpdir = mkdtemp(tmpdir_template); |
| if (!tmpdir) |
| fail("failed to mkdtemp"); |
| if (chmod(tmpdir, 0777)) |
| fail("failed to chmod"); |
| if (chdir(tmpdir)) |
| fail("failed to chdir"); |
| } |
| |
| static uintptr_t syz_open_procfs(uintptr_t a0, uintptr_t a1) |
| { |
| |
| char buf[128]; |
| memset(buf, 0, sizeof(buf)); |
| if (a0 == 0) { |
| snprintf(buf, sizeof(buf), "/proc/self/%s", (char*)a1); |
| } else if (a0 == (uintptr_t)-1) { |
| snprintf(buf, sizeof(buf), "/proc/thread-self/%s", (char*)a1); |
| } else { |
| snprintf(buf, sizeof(buf), "/proc/self/task/%d/%s", (int)a0, (char*)a1); |
| } |
| int fd = open(buf, O_RDWR); |
| if (fd == -1) |
| fd = open(buf, O_RDONLY); |
| return fd; |
| } |
| |
| static uintptr_t syz_fuseblk_mount(uintptr_t a0, uintptr_t a1, uintptr_t a2, |
| uintptr_t a3, uintptr_t a4, uintptr_t a5, |
| uintptr_t a6, uintptr_t a7) |
| { |
| uint64_t target = a0; |
| uint64_t blkdev = a1; |
| uint64_t mode = a2; |
| uint64_t uid = a3; |
| uint64_t gid = a4; |
| uint64_t maxread = a5; |
| uint64_t blksize = a6; |
| uint64_t flags = a7; |
| |
| int fd = open("/dev/fuse", O_RDWR); |
| if (fd == -1) |
| return fd; |
| if (syscall(SYS_mknodat, AT_FDCWD, blkdev, S_IFBLK, makedev(7, 199))) |
| return fd; |
| char buf[256]; |
| sprintf(buf, "fd=%d,user_id=%ld,group_id=%ld,rootmode=0%o", fd, (long)uid, |
| (long)gid, (unsigned)mode & ~3u); |
| if (maxread != 0) |
| sprintf(buf + strlen(buf), ",max_read=%ld", (long)maxread); |
| if (blksize != 0) |
| sprintf(buf + strlen(buf), ",blksize=%ld", (long)blksize); |
| if (mode & 1) |
| strcat(buf, ",default_permissions"); |
| if (mode & 2) |
| strcat(buf, ",allow_other"); |
| syscall(SYS_mount, blkdev, target, "fuseblk", flags, buf); |
| return fd; |
| } |
| |
| 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_cgroups() |
| { |
| if (mkdir("/syzcgroup", 0777)) { |
| } |
| if (mkdir("/syzcgroup/unified", 0777)) { |
| } |
| if (mount("none", "/syzcgroup/unified", "cgroup2", 0, NULL)) { |
| } |
| if (chmod("/syzcgroup/unified", 0777)) { |
| } |
| if (!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")) { |
| } |
| if (!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 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; |
| |
| setup_cgroups(); |
| sandbox_common(); |
| if (unshare(CLONE_NEWNET)) { |
| } |
| |
| loop(); |
| doexit(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) |
| fail("socket(%d, SOCK_STREAM, IPPROTO_TCP)", family); |
| 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; |
| } |
| fail("getsockopt(IPT_SO_GET_INFO)"); |
| } |
| if (table->info.size > sizeof(table->replace.entrytable)) |
| fail("table size is too large: %u", table->info.size); |
| if (table->info.num_entries > XT_MAX_ENTRIES) |
| fail("too many counters: %u", table->info.num_entries); |
| 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)) |
| fail("getsockopt(IPT_SO_GET_ENTRIES)"); |
| 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) |
| fail("socket(%d, SOCK_STREAM, IPPROTO_TCP)", family); |
| 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)) |
| fail("getsockopt(IPT_SO_GET_INFO)"); |
| 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)) |
| fail("getsockopt(IPT_SO_GET_ENTRIES)"); |
| 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)) |
| fail("setsockopt(IPT_SO_SET_REPLACE)"); |
| } |
| 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) |
| fail("socket(AF_INET, SOCK_STREAM, IPPROTO_TCP)"); |
| 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; |
| } |
| fail("getsockopt(ARPT_SO_GET_INFO)"); |
| } |
| if (table->info.size > sizeof(table->replace.entrytable)) |
| fail("table size is too large: %u", table->info.size); |
| if (table->info.num_entries > XT_MAX_ENTRIES) |
| fail("too many counters: %u", table->info.num_entries); |
| 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)) |
| fail("getsockopt(ARPT_SO_GET_ENTRIES)"); |
| 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) |
| fail("socket(AF_INET, SOCK_STREAM, IPPROTO_TCP)"); |
| 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)) |
| fail("getsockopt(ARPT_SO_GET_INFO)"); |
| 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)) |
| fail("getsockopt(ARPT_SO_GET_ENTRIES)"); |
| 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, SOL_IP, ARPT_SO_SET_REPLACE, &table->replace, optlen)) |
| fail("setsockopt(ARPT_SO_SET_REPLACE)"); |
| } |
| close(fd); |
| } |
| #include <linux/if.h> |
| #include <linux/netfilter_bridge/ebtables.h> |
| |
| 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) |
| fail("socket(AF_INET, SOCK_STREAM, IPPROTO_TCP)"); |
| 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; |
| } |
| fail("getsockopt(EBT_SO_GET_INIT_INFO)"); |
| } |
| if (table->replace.entries_size > sizeof(table->entrytable)) |
| fail("table size is too large: %u", table->replace.entries_size); |
| 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)) |
| fail("getsockopt(EBT_SO_GET_INIT_ENTRIES)"); |
| } |
| 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) |
| fail("socket(AF_INET, SOCK_STREAM, IPPROTO_TCP)"); |
| 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)) |
| fail("getsockopt(EBT_SO_GET_INFO)"); |
| 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)) |
| fail("getsockopt(EBT_SO_GET_ENTRIES)"); |
| 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)) |
| fail("setsockopt(EBT_SO_SET_ENTRIES)"); |
| } |
| 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 remove_dir(const char* dir) |
| { |
| DIR* dp; |
| struct dirent* ep; |
| int iter = 0; |
| retry: |
| dp = opendir(dir); |
| if (dp == NULL) { |
| if (errno == EMFILE) { |
| exitf("opendir(%s) failed due to NOFILE, exiting", dir); |
| } |
| exitf("opendir(%s) failed", dir); |
| } |
| 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); |
| struct stat st; |
| if (lstat(filename, &st)) |
| exitf("lstat(%s) failed", filename); |
| if (S_ISDIR(st.st_mode)) { |
| remove_dir(filename); |
| continue; |
| } |
| int i; |
| for (i = 0;; i++) { |
| if (unlink(filename) == 0) |
| break; |
| if (errno == EROFS) { |
| break; |
| } |
| if (errno != EBUSY || i > 100) |
| exitf("unlink(%s) failed", filename); |
| if (umount2(filename, MNT_DETACH)) |
| exitf("umount(%s) failed", filename); |
| } |
| } |
| closedir(dp); |
| int i; |
| for (i = 0;; i++) { |
| if (rmdir(dir) == 0) |
| break; |
| if (i < 100) { |
| if (errno == EROFS) { |
| break; |
| } |
| if (errno == EBUSY) { |
| if (umount2(dir, MNT_DETACH)) |
| exitf("umount(%s) failed", dir); |
| continue; |
| } |
| if (errno == ENOTEMPTY) { |
| if (iter < 100) { |
| iter++; |
| goto retry; |
| } |
| } |
| } |
| exitf("rmdir(%s) failed", dir); |
| } |
| } |
| |
| static int inject_fault(int nth) |
| { |
| int fd; |
| char buf[16]; |
| |
| fd = open("/proc/thread-self/fail-nth", O_RDWR); |
| if (fd == -1) |
| exitf("failed to open /proc/thread-self/fail-nth"); |
| sprintf(buf, "%d", nth + 1); |
| if (write(fd, buf, strlen(buf)) != (ssize_t)strlen(buf)) |
| exitf("failed to write /proc/thread-self/fail-nth"); |
| return fd; |
| } |
| |
| static void execute_one(); |
| extern unsigned long long procid; |
| |
| static void loop() |
| { |
| checkpoint_net_namespace(); |
| char cgroupdir[64]; |
| snprintf(cgroupdir, sizeof(cgroupdir), "/syzcgroup/unified/syz%llu", procid); |
| char cgroupdir_cpu[64]; |
| snprintf(cgroupdir_cpu, sizeof(cgroupdir_cpu), "/syzcgroup/cpu/syz%llu", |
| procid); |
| char cgroupdir_net[64]; |
| snprintf(cgroupdir_net, sizeof(cgroupdir_net), "/syzcgroup/net/syz%llu", |
| procid); |
| if (mkdir(cgroupdir, 0777)) { |
| } |
| if (mkdir(cgroupdir_cpu, 0777)) { |
| } |
| if (mkdir(cgroupdir_net, 0777)) { |
| } |
| int pid = getpid(); |
| char procs_file[128]; |
| snprintf(procs_file, sizeof(procs_file), "%s/cgroup.procs", cgroupdir); |
| if (!write_file(procs_file, "%d", pid)) { |
| } |
| snprintf(procs_file, sizeof(procs_file), "%s/cgroup.procs", cgroupdir_cpu); |
| if (!write_file(procs_file, "%d", pid)) { |
| } |
| snprintf(procs_file, sizeof(procs_file), "%s/cgroup.procs", cgroupdir_net); |
| if (!write_file(procs_file, "%d", pid)) { |
| } |
| int iter; |
| for (iter = 0;; iter++) { |
| char cwdbuf[32]; |
| sprintf(cwdbuf, "./%d", iter); |
| if (mkdir(cwdbuf, 0777)) |
| fail("failed to mkdir"); |
| int pid = fork(); |
| if (pid < 0) |
| fail("clone failed"); |
| if (pid == 0) { |
| prctl(PR_SET_PDEATHSIG, SIGKILL, 0, 0, 0); |
| setpgrp(); |
| if (chdir(cwdbuf)) |
| fail("failed to chdir"); |
| if (symlink(cgroupdir, "./cgroup")) { |
| } |
| if (symlink(cgroupdir_cpu, "./cgroup.cpu")) { |
| } |
| if (symlink(cgroupdir_net, "./cgroup.net")) { |
| } |
| execute_one(); |
| doexit(0); |
| } |
| |
| int status = 0; |
| uint64_t start = current_time_ms(); |
| for (;;) { |
| int res = waitpid(-1, &status, __WALL | WNOHANG); |
| if (res == pid) { |
| break; |
| } |
| usleep(1000); |
| if (current_time_ms() - start < 3 * 1000) |
| continue; |
| kill(-pid, SIGKILL); |
| kill(pid, SIGKILL); |
| while (waitpid(-1, &status, __WALL) != pid) { |
| } |
| break; |
| } |
| remove_dir(cwdbuf); |
| reset_net_namespace(); |
| } |
| } |
| |
| #ifndef __NR_memfd_create |
| #define __NR_memfd_create 319 |
| #endif |
| |
| uint64_t r[4] = {0xffffffffffffffff, 0xffffffffffffffff, 0xffffffffffffffff, |
| 0xffffffffffffffff}; |
| unsigned long long procid; |
| void execute_one() |
| { |
| long res; |
| memcpy((void*)0x200004c0, "oom_score_adj", 14); |
| res = syz_open_procfs(0, 0x200004c0); |
| if (res != -1) |
| r[0] = res; |
| *(uint32_t*)0x20000040 = 2; |
| *(uint32_t*)0x20000044 = 0x70; |
| *(uint8_t*)0x20000048 = 0x49; |
| *(uint8_t*)0x20000049 = 2; |
| *(uint8_t*)0x2000004a = 0; |
| *(uint8_t*)0x2000004b = 0; |
| *(uint32_t*)0x2000004c = 0; |
| *(uint64_t*)0x20000050 = 0; |
| *(uint64_t*)0x20000058 = 0; |
| *(uint64_t*)0x20000060 = 0; |
| STORE_BY_BITMASK(uint64_t, 0x20000068, 0, 0, 1); |
| STORE_BY_BITMASK(uint64_t, 0x20000068, 0, 1, 1); |
| STORE_BY_BITMASK(uint64_t, 0x20000068, 0, 2, 1); |
| STORE_BY_BITMASK(uint64_t, 0x20000068, 0, 3, 1); |
| STORE_BY_BITMASK(uint64_t, 0x20000068, 0, 4, 1); |
| STORE_BY_BITMASK(uint64_t, 0x20000068, 0, 5, 1); |
| STORE_BY_BITMASK(uint64_t, 0x20000068, 0, 6, 1); |
| STORE_BY_BITMASK(uint64_t, 0x20000068, 0, 7, 1); |
| STORE_BY_BITMASK(uint64_t, 0x20000068, 0, 8, 1); |
| STORE_BY_BITMASK(uint64_t, 0x20000068, 0, 9, 1); |
| STORE_BY_BITMASK(uint64_t, 0x20000068, 0, 10, 1); |
| STORE_BY_BITMASK(uint64_t, 0x20000068, 0, 11, 1); |
| STORE_BY_BITMASK(uint64_t, 0x20000068, 0, 12, 1); |
| STORE_BY_BITMASK(uint64_t, 0x20000068, 0, 13, 1); |
| STORE_BY_BITMASK(uint64_t, 0x20000068, 0, 14, 1); |
| STORE_BY_BITMASK(uint64_t, 0x20000068, 0, 15, 2); |
| STORE_BY_BITMASK(uint64_t, 0x20000068, 0, 17, 1); |
| STORE_BY_BITMASK(uint64_t, 0x20000068, 0, 18, 1); |
| STORE_BY_BITMASK(uint64_t, 0x20000068, 0, 19, 1); |
| STORE_BY_BITMASK(uint64_t, 0x20000068, 0, 20, 1); |
| STORE_BY_BITMASK(uint64_t, 0x20000068, 0, 21, 1); |
| STORE_BY_BITMASK(uint64_t, 0x20000068, 0, 22, 1); |
| STORE_BY_BITMASK(uint64_t, 0x20000068, 0, 23, 1); |
| STORE_BY_BITMASK(uint64_t, 0x20000068, 0, 24, 1); |
| STORE_BY_BITMASK(uint64_t, 0x20000068, 0, 25, 1); |
| STORE_BY_BITMASK(uint64_t, 0x20000068, 0, 26, 1); |
| STORE_BY_BITMASK(uint64_t, 0x20000068, 0, 27, 1); |
| STORE_BY_BITMASK(uint64_t, 0x20000068, 0, 28, 1); |
| STORE_BY_BITMASK(uint64_t, 0x20000068, 0, 29, 35); |
| *(uint32_t*)0x20000070 = 0; |
| *(uint32_t*)0x20000074 = 0; |
| *(uint64_t*)0x20000078 = 0x20000000; |
| *(uint64_t*)0x20000080 = 0; |
| *(uint64_t*)0x20000088 = 0; |
| *(uint64_t*)0x20000090 = 0; |
| *(uint32_t*)0x20000098 = 0; |
| *(uint32_t*)0x2000009c = 0; |
| *(uint64_t*)0x200000a0 = 0; |
| *(uint32_t*)0x200000a8 = 0; |
| *(uint16_t*)0x200000ac = 0; |
| *(uint16_t*)0x200000ae = 0; |
| syscall(__NR_perf_event_open, 0x20000040, 0, 0, -1, 0); |
| memcpy((void*)0x20001800, "\x6e\x61\x74\x00\x00\x00\x00\x00\x00\x00\x00\x00" |
| "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00" |
| "\x00\x00\x00\x00\x00\x00\x00\x00", |
| 32); |
| *(uint32_t*)0x20001820 = 0; |
| *(uint32_t*)0x20001824 = 3; |
| *(uint32_t*)0x20001828 = 0x1000; |
| *(uint64_t*)0x20001830 = 0; |
| *(uint64_t*)0x20001838 = 0; |
| *(uint64_t*)0x20001840 = 0; |
| *(uint64_t*)0x20001848 = 0; |
| *(uint64_t*)0x20001850 = 0; |
| *(uint64_t*)0x20001858 = 0; |
| *(uint32_t*)0x20001860 = 2; |
| *(uint64_t*)0x20001868 = 0x20001280; |
| *(uint64_t*)0x20001870 = 0x20002040; |
| *(uint32_t*)0x200013c0 = 0x78; |
| syscall(__NR_getsockopt, r[0], 0, 0x83, 0x20001800, 0x200013c0); |
| syscall(__NR_ioprio_get, 0, 0); |
| *(uint64_t*)0x20cd0000 = 0; |
| *(uint32_t*)0x20cd0008 = 0; |
| *(uint32_t*)0x20cd000c = 0; |
| *(uint32_t*)0x20cd0010 = 0; |
| syscall(__NR_timer_create, 0, 0x20cd0000, 0x20044000); |
| *(uint64_t*)0x204b1fe0 = 0; |
| *(uint64_t*)0x204b1fe8 = 0x1c9c380; |
| *(uint64_t*)0x204b1ff0 = 0; |
| *(uint64_t*)0x204b1ff8 = 9; |
| syscall(__NR_timer_settime, 0, 0, 0x204b1fe0, 0x20040000); |
| memcpy((void*)0x20002000, "./bus", 6); |
| res = syscall(__NR_open, 0x20002000, 0x141042, 0); |
| if (res != -1) |
| r[1] = res; |
| syscall(__NR_ftruncate, r[1], 0x7fff); |
| memcpy((void*)0x20001180, "./bus", 6); |
| syscall(__NR_truncate, 0x20001180, 4); |
| memcpy((void*)0x20f40000, "/dev/ptmx", 10); |
| res = syscall(__NR_openat, 0xffffffffffffff9c, 0x20f40000, 0x200000000101002, |
| 0); |
| if (res != -1) |
| r[2] = res; |
| *(uint64_t*)0x200010c0 = 0; |
| syscall(__NR_sendfile, r[2], -1, 0x200010c0, 0x10000065); |
| *(uint64_t*)0x20000000 = 0; |
| syscall(__NR_sendfile, r[0], r[1], 0x20000000, 4); |
| syscall(__NR_tkill, 0, 0); |
| memcpy((void*)0x20000000, "", 1); |
| res = syscall(__NR_memfd_create, 0x20000000, 1); |
| if (res != -1) |
| r[3] = res; |
| syscall(__NR_ioctl, r[3], 0x8903, 0x20001200); |
| *(uint64_t*)0x20001500 = 0x200012c0; |
| *(uint32_t*)0x20001508 = 0x80; |
| *(uint64_t*)0x20001510 = 0x20001400; |
| *(uint64_t*)0x20001400 = 0x20001340; |
| *(uint64_t*)0x20001408 = 0x67; |
| *(uint64_t*)0x20001518 = 1; |
| *(uint64_t*)0x20001520 = 0x20001440; |
| *(uint64_t*)0x20001528 = 0x9b; |
| *(uint32_t*)0x20001530 = 0; |
| syscall(__NR_recvmsg, 0xffffff9c, 0x20001500, 0); |
| syscall(__NR_ioctl, -1, 0x8903, 0x20001540); |
| *(uint64_t*)0x20001640 = 0x1ff; |
| *(uint16_t*)0x20001648 = 2; |
| *(uint16_t*)0x2000164a = htobe16(0x4e21); |
| *(uint32_t*)0x2000164c = htobe32(0); |
| *(uint8_t*)0x20001650 = 0; |
| *(uint8_t*)0x20001651 = 0; |
| *(uint8_t*)0x20001652 = 0; |
| *(uint8_t*)0x20001653 = 0; |
| *(uint8_t*)0x20001654 = 0; |
| *(uint8_t*)0x20001655 = 0; |
| *(uint8_t*)0x20001656 = 0; |
| *(uint8_t*)0x20001657 = 0; |
| *(uint16_t*)0x20001658 = 2; |
| *(uint16_t*)0x2000165a = htobe16(0x4e20); |
| *(uint8_t*)0x2000165c = 0xac; |
| *(uint8_t*)0x2000165d = 0x14; |
| *(uint8_t*)0x2000165e = 0x14; |
| *(uint8_t*)0x2000165f = 0x12; |
| *(uint8_t*)0x20001660 = 0; |
| *(uint8_t*)0x20001661 = 0; |
| *(uint8_t*)0x20001662 = 0; |
| *(uint8_t*)0x20001663 = 0; |
| *(uint8_t*)0x20001664 = 0; |
| *(uint8_t*)0x20001665 = 0; |
| *(uint8_t*)0x20001666 = 0; |
| *(uint8_t*)0x20001667 = 0; |
| *(uint16_t*)0x20001668 = 2; |
| *(uint16_t*)0x2000166a = htobe16(0); |
| *(uint32_t*)0x2000166c = htobe32(0xe0000002); |
| *(uint8_t*)0x20001670 = 0; |
| *(uint8_t*)0x20001671 = 0; |
| *(uint8_t*)0x20001672 = 0; |
| *(uint8_t*)0x20001673 = 0; |
| *(uint8_t*)0x20001674 = 0; |
| *(uint8_t*)0x20001675 = 0; |
| *(uint8_t*)0x20001676 = 0; |
| *(uint8_t*)0x20001677 = 0; |
| *(uint16_t*)0x20001678 = 0; |
| *(uint16_t*)0x2000167a = 9; |
| *(uint64_t*)0x20001680 = 2; |
| *(uint64_t*)0x20001688 = 6; |
| *(uint16_t*)0x20001690 = 0; |
| *(uint64_t*)0x20001698 = 0x20001240; |
| memcpy((void*)0x20001240, |
| "\x74\x65\x71\x6c\x30\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00", |
| 16); |
| *(uint64_t*)0x200016a0 = 0; |
| *(uint64_t*)0x200016a8 = 0x80; |
| *(uint16_t*)0x200016b0 = 0; |
| syscall(__NR_ioctl, r[0], 0x890b, 0x20001640); |
| syscall(__NR_inotify_rm_watch, -1, 0); |
| *(uint32_t*)0x20000100 = 0xffffffa4; |
| syscall(__NR_getsockopt, r[3], 1, 0x11, 0x20000140, 0x20000100); |
| *(uint32_t*)0x20001600 = 0; |
| syscall(__NR_getgroups, 1, 0x20001600); |
| memcpy((void*)0x20001740, "./file0", 8); |
| memcpy((void*)0x20001780, "./file0", 8); |
| write_file("/sys/kernel/debug/failslab/ignore-gfp-wait", "N"); |
| write_file("/sys/kernel/debug/fail_futex/ignore-private", "N"); |
| inject_fault(42); |
| syz_fuseblk_mount(0x20001740, 0x20001780, 0, 0, -1, 0x3ff, 1, 0); |
| } |
| |
| int main() |
| { |
| syscall(__NR_mmap, 0x20000000, 0x1000000, 3, 0x32, -1, 0); |
| char* cwd = get_current_dir_name(); |
| for (procid = 0; procid < 8; procid++) { |
| if (fork() == 0) { |
| for (;;) { |
| if (chdir(cwd)) |
| fail("failed to chdir"); |
| use_temporary_dir(); |
| int pid = do_sandbox_none(); |
| int status = 0; |
| while (waitpid(pid, &status, __WALL) != pid) { |
| } |
| } |
| } |
| } |
| sleep(1000000); |
| return 0; |
| } |