cafe-grader-judge-scripts

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Merge pull request #12 from nattee/master...
Commit Description:
Merge pull request #12 from nattee/master finalizing merge of nattee's master
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r262:4d6d5b46e21a merge default
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std-script/box64-new.c | 1760 lines | 47.0 KiB | text/x-c | CLexer |
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/*
* A Simple Sandbox for Moe
*
* (c) 2001--2010 Martin Mares <mj@ucw.cz>
*/
#define _LARGEFILE64_SOURCE
#define _GNU_SOURCE
/* Generated automatically by ./configure, please don't touch manually. */
#define CONFIG_BOX_KERNEL_AMD64 1
#define CONFIG_BOX_USER_AMD64 1
#define CONFIG_DIR "cf"
#define CONFIG_DIRECT_IO 1
#define CONFIG_ISOLATE_BOX_DIR "/tmp/box"
#define CONFIG_ISOLATE_CGROUP_ROOT "/sys/fs/cgroup"
#define CONFIG_ISOLATE_FIRST_GID 60000
#define CONFIG_ISOLATE_FIRST_UID 60000
#define CONFIG_ISOLATE_NUM_BOXES 100
#define CONFIG_LARGE_FILES 1
#define CONFIG_LFS 1
#define CONFIG_LINUX 1
#define CONFIG_LOCAL 1
#define CONFIG_UCW_PARTMAP_IS_MMAP 1
#define CONFIG_UCW_PERL 1
#define CONFIG_UCW_POOL_IS_MMAP 1
#define CONFIG_UCW_RADIX_SORTER_BITS 10
#define CONFIG_UCW_SHELL_UTILS 1
#define CPU_64BIT_POINTERS 1
#define CPU_ALLOW_UNALIGNED 1
#define CPU_AMD64 1
#define CPU_ARCH "default"
#define CPU_LITTLE_ENDIAN 1
#define CPU_PAGE_SIZE 4096
#define CPU_STRUCT_ALIGN 8
#define CWARNS_OFF " -Wno-pointer-sign"
#define HAVE_ASCII_DOC "none"
#define INSTALL_BIN_DIR "bin"
#define INSTALL_CONFIG_DIR "cf"
#define INSTALL_DOC_DIR "share/doc"
#define INSTALL_INCLUDE_DIR "include"
#define INSTALL_LIB_DIR "lib"
#define INSTALL_LOG_DIR "log"
#define INSTALL_MAN_DIR "share/man"
#define INSTALL_PERL_DIR "lib/perl5"
#define INSTALL_PKGCONFIG_DIR "lib/pkgconfig"
#define INSTALL_PREFIX
#define INSTALL_RUN_DIR "run"
#define INSTALL_SBIN_DIR "sbin"
#define INSTALL_SHARE_DIR "share"
#define INSTALL_STATE_DIR "lib"
#define INSTALL_USR_PREFIX
#define INSTALL_VAR_PREFIX
#define SHERLOCK_VERSION "3.99.2"
#define SHERLOCK_VERSION_CODE 3099002
#define SONAME_PREFIX "lib/"
#define UCW_VERSION "3.99.2"
#define UCW_VERSION_CODE 3099002
#include <errno.h>
#include <stdio.h>
#include <fcntl.h>
#include <stdlib.h>
#include <string.h>
#include <stdarg.h>
#include <stdint.h>
#include <unistd.h>
#include <getopt.h>
#include <time.h>
#include <sys/wait.h>
#include <sys/user.h>
#include <sys/time.h>
#include <sys/ptrace.h>
#include <sys/signal.h>
#include <sys/sysinfo.h>
#include <sys/resource.h>
#include <sys/utsname.h>
//#include <linux/ptrace.h>
#if defined(CONFIG_BOX_KERNEL_AMD64) && !defined(CONFIG_BOX_USER_AMD64)
#include <asm/unistd_32.h>
#define NATIVE_NR_execve 59 /* 64-bit execve */
#else
#include <asm/unistd.h>
#define NATIVE_NR_execve __NR_execve
#endif
#define NONRET __attribute__((noreturn))
#define UNUSED __attribute__((unused))
#define ARRAY_SIZE(a) (int)(sizeof(a)/sizeof(a[0]))
static int filter_syscalls; /* 0=off, 1=liberal, 2=totalitarian */
static int timeout; /* milliseconds */
static int wall_timeout;
static int extra_timeout;
static int pass_environ;
static int file_access;
static int verbose;
static int memory_limit;
static int stack_limit;
static char *redir_stdin, *redir_stdout, *redir_stderr;
static char *set_cwd;
static pid_t box_pid;
static int is_ptraced;
static volatile int timer_tick;
static struct timeval start_time;
static int ticks_per_sec;
static int exec_seen;
static int partial_line;
static int mem_peak_kb;
static int total_ms, wall_ms, sys_ms;
static void die(char *msg, ...) NONRET;
static void sample_mem_peak(void);
/*** Meta-files ***/
static FILE *metafile;
static void
meta_open(const char *name)
{
if (!strcmp(name, "-"))
{
metafile = stdout;
return;
}
metafile = fopen(name, "w");
if (!metafile)
die("Failed to open metafile '%s'",name);
}
static void
meta_close(void)
{
if (metafile && metafile != stdout)
fclose(metafile);
}
static void __attribute__((format(printf,1,2)))
meta_printf(const char *fmt, ...)
{
if (!metafile)
return;
va_list args;
va_start(args, fmt);
vfprintf(metafile, fmt, args);
va_end(args);
}
static void print_running_stat(double wall_time,
double user_time,
double system_time,
int mem_usage)
{
//total is user
//wall is wall
//
fprintf(stderr,"%.4lfr%.4lfu%.4lfs%dkbytes\n",
wall_time, user_time, system_time, mem_usage);
}
static void
final_stats(struct rusage *rus)
{
struct timeval total, now, wall;
timeradd(&rus->ru_utime, &rus->ru_stime, &total);
total_ms = total.tv_sec*1000 + total.tv_usec/1000;
gettimeofday(&now, NULL);
timersub(&now, &start_time, &wall);
wall_ms = wall.tv_sec*1000 + wall.tv_usec/1000;
sys_ms = rus->ru_stime.tv_sec * 1000 + rus->ru_stime.tv_usec / 1000;
meta_printf("time:%d.%03d\n", total_ms/1000, total_ms%1000);
meta_printf("time-wall:%d.%03d\n", wall_ms/1000, wall_ms%1000);
meta_printf("mem:%llu\n", (unsigned long long) mem_peak_kb * 1024);
}
/*** Messages and exits ***/
static void NONRET
box_exit(int rc)
{
if (box_pid > 0)
{
sample_mem_peak();
if (is_ptraced)
ptrace(PTRACE_KILL, box_pid);
kill(-box_pid, SIGKILL);
kill(box_pid, SIGKILL);
meta_printf("killed:1\n");
struct rusage rus;
int p, stat;
do
p = wait4(box_pid, &stat, 0, &rus);
while (p < 0 && errno == EINTR);
if (p < 0)
fprintf(stderr, "UGH: Lost track of the process (%m)\n");
else {
final_stats(&rus);
}
}
print_running_stat(
(double)wall_ms/1000,
(double)total_ms/1000,
(double)sys_ms/1000,
mem_peak_kb);
meta_close();
exit(rc);
}
static void
flush_line(void)
{
if (partial_line)
fputc('\n', stderr);
partial_line = 0;
}
/* Report an error of the sandbox itself */
static void NONRET __attribute__((format(printf,1,2)))
die(char *msg, ...)
{
va_list args;
va_start(args, msg);
flush_line();
char buf[1024];
vsnprintf(buf, sizeof(buf), msg, args);
meta_printf("status:XX\nmessage:%s\n", buf);
fputs(buf, stderr);
fputc('\n', stderr);
box_exit(2);
}
/* Report an error of the program inside the sandbox */
static void NONRET __attribute__((format(printf,1,2)))
err(char *msg, ...)
{
va_list args;
va_start(args, msg);
flush_line();
if (msg[0] && msg[1] && msg[2] == ':' && msg[3] == ' ')
{
meta_printf("status:%c%c\n", msg[0], msg[1]);
msg += 4;
}
char buf[1024];
vsnprintf(buf, sizeof(buf), msg, args);
meta_printf("message:%s\n", buf);
fputs(buf, stderr);
fputc('\n', stderr);
box_exit(1);
}
/* Write a message, but only if in verbose mode */
static void __attribute__((format(printf,1,2)))
msg(char *msg, ...)
{
va_list args;
va_start(args, msg);
if (verbose)
{
int len = strlen(msg);
if (len > 0)
partial_line = (msg[len-1] != '\n');
vfprintf(stderr, msg, args);
fflush(stderr);
}
va_end(args);
}
static void *
xmalloc(size_t size)
{
void *p = malloc(size);
if (!p)
die("Out of memory");
return p;
}
/*** Syscall rules ***/
static const char * const syscall_names[] = {
/* Syscall table automatically generated by mk-syscall-table */
/* 0 */ [ __NR_read ] = "read",
/* 1 */ [ __NR_write ] = "write",
/* 2 */ [ __NR_open ] = "open",
/* 3 */ [ __NR_close ] = "close",
/* 4 */ [ __NR_stat ] = "stat",
/* 5 */ [ __NR_fstat ] = "fstat",
/* 6 */ [ __NR_lstat ] = "lstat",
/* 7 */ [ __NR_poll ] = "poll",
/* 8 */ [ __NR_lseek ] = "lseek",
/* 9 */ [ __NR_mmap ] = "mmap",
/* 10 */ [ __NR_mprotect ] = "mprotect",
/* 11 */ [ __NR_munmap ] = "munmap",
/* 12 */ [ __NR_brk ] = "brk",
/* 13 */ [ __NR_rt_sigaction ] = "rt_sigaction",
/* 14 */ [ __NR_rt_sigprocmask ] = "rt_sigprocmask",
/* 15 */ [ __NR_rt_sigreturn ] = "rt_sigreturn",
/* 16 */ [ __NR_ioctl ] = "ioctl",
/* 17 */ [ __NR_pread64 ] = "pread64",
/* 18 */ [ __NR_pwrite64 ] = "pwrite64",
/* 19 */ [ __NR_readv ] = "readv",
/* 20 */ [ __NR_writev ] = "writev",
/* 21 */ [ __NR_access ] = "access",
/* 22 */ [ __NR_pipe ] = "pipe",
/* 23 */ [ __NR_select ] = "select",
/* 24 */ [ __NR_sched_yield ] = "sched_yield",
/* 25 */ [ __NR_mremap ] = "mremap",
/* 26 */ [ __NR_msync ] = "msync",
/* 27 */ [ __NR_mincore ] = "mincore",
/* 28 */ [ __NR_madvise ] = "madvise",
/* 29 */ [ __NR_shmget ] = "shmget",
/* 30 */ [ __NR_shmat ] = "shmat",
/* 31 */ [ __NR_shmctl ] = "shmctl",
/* 32 */ [ __NR_dup ] = "dup",
/* 33 */ [ __NR_dup2 ] = "dup2",
/* 34 */ [ __NR_pause ] = "pause",
/* 35 */ [ __NR_nanosleep ] = "nanosleep",
/* 36 */ [ __NR_getitimer ] = "getitimer",
/* 37 */ [ __NR_alarm ] = "alarm",
/* 38 */ [ __NR_setitimer ] = "setitimer",
/* 39 */ [ __NR_getpid ] = "getpid",
/* 40 */ [ __NR_sendfile ] = "sendfile",
/* 41 */ [ __NR_socket ] = "socket",
/* 42 */ [ __NR_connect ] = "connect",
/* 43 */ [ __NR_accept ] = "accept",
/* 44 */ [ __NR_sendto ] = "sendto",
/* 45 */ [ __NR_recvfrom ] = "recvfrom",
/* 46 */ [ __NR_sendmsg ] = "sendmsg",
/* 47 */ [ __NR_recvmsg ] = "recvmsg",
/* 48 */ [ __NR_shutdown ] = "shutdown",
/* 49 */ [ __NR_bind ] = "bind",
/* 50 */ [ __NR_listen ] = "listen",
/* 51 */ [ __NR_getsockname ] = "getsockname",
/* 52 */ [ __NR_getpeername ] = "getpeername",
/* 53 */ [ __NR_socketpair ] = "socketpair",
/* 54 */ [ __NR_setsockopt ] = "setsockopt",
/* 55 */ [ __NR_getsockopt ] = "getsockopt",
/* 56 */ [ __NR_clone ] = "clone",
/* 57 */ [ __NR_fork ] = "fork",
/* 58 */ [ __NR_vfork ] = "vfork",
/* 59 */ [ __NR_execve ] = "execve",
/* 60 */ [ __NR_exit ] = "exit",
/* 61 */ [ __NR_wait4 ] = "wait4",
/* 62 */ [ __NR_kill ] = "kill",
/* 63 */ [ __NR_uname ] = "uname",
/* 64 */ [ __NR_semget ] = "semget",
/* 65 */ [ __NR_semop ] = "semop",
/* 66 */ [ __NR_semctl ] = "semctl",
/* 67 */ [ __NR_shmdt ] = "shmdt",
/* 68 */ [ __NR_msgget ] = "msgget",
/* 69 */ [ __NR_msgsnd ] = "msgsnd",
/* 70 */ [ __NR_msgrcv ] = "msgrcv",
/* 71 */ [ __NR_msgctl ] = "msgctl",
/* 72 */ [ __NR_fcntl ] = "fcntl",
/* 73 */ [ __NR_flock ] = "flock",
/* 74 */ [ __NR_fsync ] = "fsync",
/* 75 */ [ __NR_fdatasync ] = "fdatasync",
/* 76 */ [ __NR_truncate ] = "truncate",
/* 77 */ [ __NR_ftruncate ] = "ftruncate",
/* 78 */ [ __NR_getdents ] = "getdents",
/* 79 */ [ __NR_getcwd ] = "getcwd",
/* 80 */ [ __NR_chdir ] = "chdir",
/* 81 */ [ __NR_fchdir ] = "fchdir",
/* 82 */ [ __NR_rename ] = "rename",
/* 83 */ [ __NR_mkdir ] = "mkdir",
/* 84 */ [ __NR_rmdir ] = "rmdir",
/* 85 */ [ __NR_creat ] = "creat",
/* 86 */ [ __NR_link ] = "link",
/* 87 */ [ __NR_unlink ] = "unlink",
/* 88 */ [ __NR_symlink ] = "symlink",
/* 89 */ [ __NR_readlink ] = "readlink",
/* 90 */ [ __NR_chmod ] = "chmod",
/* 91 */ [ __NR_fchmod ] = "fchmod",
/* 92 */ [ __NR_chown ] = "chown",
/* 93 */ [ __NR_fchown ] = "fchown",
/* 94 */ [ __NR_lchown ] = "lchown",
/* 95 */ [ __NR_umask ] = "umask",
/* 96 */ [ __NR_gettimeofday ] = "gettimeofday",
/* 97 */ [ __NR_getrlimit ] = "getrlimit",
/* 98 */ [ __NR_getrusage ] = "getrusage",
/* 99 */ [ __NR_sysinfo ] = "sysinfo",
/* 100 */ [ __NR_times ] = "times",
/* 101 */ [ __NR_ptrace ] = "ptrace",
/* 102 */ [ __NR_getuid ] = "getuid",
/* 103 */ [ __NR_syslog ] = "syslog",
/* 104 */ [ __NR_getgid ] = "getgid",
/* 105 */ [ __NR_setuid ] = "setuid",
/* 106 */ [ __NR_setgid ] = "setgid",
/* 107 */ [ __NR_geteuid ] = "geteuid",
/* 108 */ [ __NR_getegid ] = "getegid",
/* 109 */ [ __NR_setpgid ] = "setpgid",
/* 110 */ [ __NR_getppid ] = "getppid",
/* 111 */ [ __NR_getpgrp ] = "getpgrp",
/* 112 */ [ __NR_setsid ] = "setsid",
/* 113 */ [ __NR_setreuid ] = "setreuid",
/* 114 */ [ __NR_setregid ] = "setregid",
/* 115 */ [ __NR_getgroups ] = "getgroups",
/* 116 */ [ __NR_setgroups ] = "setgroups",
/* 117 */ [ __NR_setresuid ] = "setresuid",
/* 118 */ [ __NR_getresuid ] = "getresuid",
/* 119 */ [ __NR_setresgid ] = "setresgid",
/* 120 */ [ __NR_getresgid ] = "getresgid",
/* 121 */ [ __NR_getpgid ] = "getpgid",
/* 122 */ [ __NR_setfsuid ] = "setfsuid",
/* 123 */ [ __NR_setfsgid ] = "setfsgid",
/* 124 */ [ __NR_getsid ] = "getsid",
/* 125 */ [ __NR_capget ] = "capget",
/* 126 */ [ __NR_capset ] = "capset",
/* 127 */ [ __NR_rt_sigpending ] = "rt_sigpending",
/* 128 */ [ __NR_rt_sigtimedwait ] = "rt_sigtimedwait",
/* 129 */ [ __NR_rt_sigqueueinfo ] = "rt_sigqueueinfo",
/* 130 */ [ __NR_rt_sigsuspend ] = "rt_sigsuspend",
/* 131 */ [ __NR_sigaltstack ] = "sigaltstack",
/* 132 */ [ __NR_utime ] = "utime",
/* 133 */ [ __NR_mknod ] = "mknod",
/* 134 */ [ __NR_uselib ] = "uselib",
/* 135 */ [ __NR_personality ] = "personality",
/* 136 */ [ __NR_ustat ] = "ustat",
/* 137 */ [ __NR_statfs ] = "statfs",
/* 138 */ [ __NR_fstatfs ] = "fstatfs",
/* 139 */ [ __NR_sysfs ] = "sysfs",
/* 140 */ [ __NR_getpriority ] = "getpriority",
/* 141 */ [ __NR_setpriority ] = "setpriority",
/* 142 */ [ __NR_sched_setparam ] = "sched_setparam",
/* 143 */ [ __NR_sched_getparam ] = "sched_getparam",
/* 144 */ [ __NR_sched_setscheduler ] = "sched_setscheduler",
/* 145 */ [ __NR_sched_getscheduler ] = "sched_getscheduler",
/* 146 */ [ __NR_sched_get_priority_max ] = "sched_get_priority_max",
/* 147 */ [ __NR_sched_get_priority_min ] = "sched_get_priority_min",
/* 148 */ [ __NR_sched_rr_get_interval ] = "sched_rr_get_interval",
/* 149 */ [ __NR_mlock ] = "mlock",
/* 150 */ [ __NR_munlock ] = "munlock",
/* 151 */ [ __NR_mlockall ] = "mlockall",
/* 152 */ [ __NR_munlockall ] = "munlockall",
/* 153 */ [ __NR_vhangup ] = "vhangup",
/* 154 */ [ __NR_modify_ldt ] = "modify_ldt",
/* 155 */ [ __NR_pivot_root ] = "pivot_root",
/* 156 */ [ __NR__sysctl ] = "_sysctl",
/* 157 */ [ __NR_prctl ] = "prctl",
/* 158 */ [ __NR_arch_prctl ] = "arch_prctl",
/* 159 */ [ __NR_adjtimex ] = "adjtimex",
/* 160 */ [ __NR_setrlimit ] = "setrlimit",
/* 161 */ [ __NR_chroot ] = "chroot",
/* 162 */ [ __NR_sync ] = "sync",
/* 163 */ [ __NR_acct ] = "acct",
/* 164 */ [ __NR_settimeofday ] = "settimeofday",
/* 165 */ [ __NR_mount ] = "mount",
/* 166 */ [ __NR_umount2 ] = "umount2",
/* 167 */ [ __NR_swapon ] = "swapon",
/* 168 */ [ __NR_swapoff ] = "swapoff",
/* 169 */ [ __NR_reboot ] = "reboot",
/* 170 */ [ __NR_sethostname ] = "sethostname",
/* 171 */ [ __NR_setdomainname ] = "setdomainname",
/* 172 */ [ __NR_iopl ] = "iopl",
/* 173 */ [ __NR_ioperm ] = "ioperm",
/* 174 */ [ __NR_create_module ] = "create_module",
/* 175 */ [ __NR_init_module ] = "init_module",
/* 176 */ [ __NR_delete_module ] = "delete_module",
/* 177 */ [ __NR_get_kernel_syms ] = "get_kernel_syms",
/* 178 */ [ __NR_query_module ] = "query_module",
/* 179 */ [ __NR_quotactl ] = "quotactl",
/* 180 */ [ __NR_nfsservctl ] = "nfsservctl",
/* 181 */ [ __NR_getpmsg ] = "getpmsg",
/* 182 */ [ __NR_putpmsg ] = "putpmsg",
/* 183 */ [ __NR_afs_syscall ] = "afs_syscall",
/* 184 */ [ __NR_tuxcall ] = "tuxcall",
/* 185 */ [ __NR_security ] = "security",
/* 186 */ [ __NR_gettid ] = "gettid",
/* 187 */ [ __NR_readahead ] = "readahead",
/* 188 */ [ __NR_setxattr ] = "setxattr",
/* 189 */ [ __NR_lsetxattr ] = "lsetxattr",
/* 190 */ [ __NR_fsetxattr ] = "fsetxattr",
/* 191 */ [ __NR_getxattr ] = "getxattr",
/* 192 */ [ __NR_lgetxattr ] = "lgetxattr",
/* 193 */ [ __NR_fgetxattr ] = "fgetxattr",
/* 194 */ [ __NR_listxattr ] = "listxattr",
/* 195 */ [ __NR_llistxattr ] = "llistxattr",
/* 196 */ [ __NR_flistxattr ] = "flistxattr",
/* 197 */ [ __NR_removexattr ] = "removexattr",
/* 198 */ [ __NR_lremovexattr ] = "lremovexattr",
/* 199 */ [ __NR_fremovexattr ] = "fremovexattr",
/* 200 */ [ __NR_tkill ] = "tkill",
/* 201 */ [ __NR_time ] = "time",
/* 202 */ [ __NR_futex ] = "futex",
/* 203 */ [ __NR_sched_setaffinity ] = "sched_setaffinity",
/* 204 */ [ __NR_sched_getaffinity ] = "sched_getaffinity",
/* 205 */ [ __NR_set_thread_area ] = "set_thread_area",
/* 206 */ [ __NR_io_setup ] = "io_setup",
/* 207 */ [ __NR_io_destroy ] = "io_destroy",
/* 208 */ [ __NR_io_getevents ] = "io_getevents",
/* 209 */ [ __NR_io_submit ] = "io_submit",
/* 210 */ [ __NR_io_cancel ] = "io_cancel",
/* 211 */ [ __NR_get_thread_area ] = "get_thread_area",
/* 212 */ [ __NR_lookup_dcookie ] = "lookup_dcookie",
/* 213 */ [ __NR_epoll_create ] = "epoll_create",
/* 214 */ [ __NR_epoll_ctl_old ] = "epoll_ctl_old",
/* 215 */ [ __NR_epoll_wait_old ] = "epoll_wait_old",
/* 216 */ [ __NR_remap_file_pages ] = "remap_file_pages",
/* 217 */ [ __NR_getdents64 ] = "getdents64",
/* 218 */ [ __NR_set_tid_address ] = "set_tid_address",
/* 219 */ [ __NR_restart_syscall ] = "restart_syscall",
/* 220 */ [ __NR_semtimedop ] = "semtimedop",
/* 221 */ [ __NR_fadvise64 ] = "fadvise64",
/* 222 */ [ __NR_timer_create ] = "timer_create",
/* 223 */ [ __NR_timer_settime ] = "timer_settime",
/* 224 */ [ __NR_timer_gettime ] = "timer_gettime",
/* 225 */ [ __NR_timer_getoverrun ] = "timer_getoverrun",
/* 226 */ [ __NR_timer_delete ] = "timer_delete",
/* 227 */ [ __NR_clock_settime ] = "clock_settime",
/* 228 */ [ __NR_clock_gettime ] = "clock_gettime",
/* 229 */ [ __NR_clock_getres ] = "clock_getres",
/* 230 */ [ __NR_clock_nanosleep ] = "clock_nanosleep",
/* 231 */ [ __NR_exit_group ] = "exit_group",
/* 232 */ [ __NR_epoll_wait ] = "epoll_wait",
/* 233 */ [ __NR_epoll_ctl ] = "epoll_ctl",
/* 234 */ [ __NR_tgkill ] = "tgkill",
/* 235 */ [ __NR_utimes ] = "utimes",
/* 236 */ [ __NR_vserver ] = "vserver",
/* 237 */ [ __NR_mbind ] = "mbind",
/* 238 */ [ __NR_set_mempolicy ] = "set_mempolicy",
/* 239 */ [ __NR_get_mempolicy ] = "get_mempolicy",
/* 240 */ [ __NR_mq_open ] = "mq_open",
/* 241 */ [ __NR_mq_unlink ] = "mq_unlink",
/* 242 */ [ __NR_mq_timedsend ] = "mq_timedsend",
/* 243 */ [ __NR_mq_timedreceive ] = "mq_timedreceive",
/* 244 */ [ __NR_mq_notify ] = "mq_notify",
/* 245 */ [ __NR_mq_getsetattr ] = "mq_getsetattr",
/* 246 */ [ __NR_kexec_load ] = "kexec_load",
/* 247 */ [ __NR_waitid ] = "waitid",
/* 248 */ [ __NR_add_key ] = "add_key",
/* 249 */ [ __NR_request_key ] = "request_key",
/* 250 */ [ __NR_keyctl ] = "keyctl",
/* 251 */ [ __NR_ioprio_set ] = "ioprio_set",
/* 252 */ [ __NR_ioprio_get ] = "ioprio_get",
/* 253 */ [ __NR_inotify_init ] = "inotify_init",
/* 254 */ [ __NR_inotify_add_watch ] = "inotify_add_watch",
/* 255 */ [ __NR_inotify_rm_watch ] = "inotify_rm_watch",
/* 256 */ [ __NR_migrate_pages ] = "migrate_pages",
/* 257 */ [ __NR_openat ] = "openat",
/* 258 */ [ __NR_mkdirat ] = "mkdirat",
/* 259 */ [ __NR_mknodat ] = "mknodat",
/* 260 */ [ __NR_fchownat ] = "fchownat",
/* 261 */ [ __NR_futimesat ] = "futimesat",
/* 262 */ [ __NR_newfstatat ] = "newfstatat",
/* 263 */ [ __NR_unlinkat ] = "unlinkat",
/* 264 */ [ __NR_renameat ] = "renameat",
/* 265 */ [ __NR_linkat ] = "linkat",
/* 266 */ [ __NR_symlinkat ] = "symlinkat",
/* 267 */ [ __NR_readlinkat ] = "readlinkat",
/* 268 */ [ __NR_fchmodat ] = "fchmodat",
/* 269 */ [ __NR_faccessat ] = "faccessat",
/* 270 */ [ __NR_pselect6 ] = "pselect6",
/* 271 */ [ __NR_ppoll ] = "ppoll",
/* 272 */ [ __NR_unshare ] = "unshare",
/* 273 */ [ __NR_set_robust_list ] = "set_robust_list",
/* 274 */ [ __NR_get_robust_list ] = "get_robust_list",
/* 275 */ [ __NR_splice ] = "splice",
/* 276 */ [ __NR_tee ] = "tee",
/* 277 */ [ __NR_sync_file_range ] = "sync_file_range",
/* 278 */ [ __NR_vmsplice ] = "vmsplice",
/* 279 */ [ __NR_move_pages ] = "move_pages",
/* 280 */ [ __NR_utimensat ] = "utimensat",
/* 281 */ [ __NR_epoll_pwait ] = "epoll_pwait",
/* 282 */ [ __NR_signalfd ] = "signalfd",
/* 283 */ [ __NR_timerfd_create ] = "timerfd_create",
/* 284 */ [ __NR_eventfd ] = "eventfd",
/* 285 */ [ __NR_fallocate ] = "fallocate",
/* 286 */ [ __NR_timerfd_settime ] = "timerfd_settime",
/* 287 */ [ __NR_timerfd_gettime ] = "timerfd_gettime",
/* 288 */ [ __NR_accept4 ] = "accept4",
/* 289 */ [ __NR_signalfd4 ] = "signalfd4",
/* 290 */ [ __NR_eventfd2 ] = "eventfd2",
/* 291 */ [ __NR_epoll_create1 ] = "epoll_create1",
/* 292 */ [ __NR_dup3 ] = "dup3",
/* 293 */ [ __NR_pipe2 ] = "pipe2",
/* 294 */ [ __NR_inotify_init1 ] = "inotify_init1",
/* 295 */ [ __NR_preadv ] = "preadv",
/* 296 */ [ __NR_pwritev ] = "pwritev",
/* 297 */ [ __NR_rt_tgsigqueueinfo ] = "rt_tgsigqueueinfo",
/* 298 */ [ __NR_perf_event_open ] = "perf_event_open",
/* 299 */ [ __NR_recvmmsg ] = "recvmmsg",
/* 300 */ [ __NR_fanotify_init ] = "fanotify_init",
/* 301 */ [ __NR_fanotify_mark ] = "fanotify_mark",
/* 302 */ [ __NR_prlimit64 ] = "prlimit64",
/* 303 */ [ __NR_name_to_handle_at ] = "name_to_handle_at",
/* 304 */ [ __NR_open_by_handle_at ] = "open_by_handle_at",
/* 305 */ [ __NR_clock_adjtime ] = "clock_adjtime",
/* 306 */ [ __NR_syncfs ] = "syncfs",
/* 307 */ [ __NR_sendmmsg ] = "sendmmsg",
/* 308 */ [ __NR_setns ] = "setns",
/* 309 */ [ __NR_getcpu ] = "getcpu",
/* 310 */ [ __NR_process_vm_readv ] = "process_vm_readv",
/* 311 */ [ __NR_process_vm_writev ] = "process_vm_writev",
/* 312 */ [ __NR_kcmp ] = "kcmp",
/* 313 */ [ __NR_finit_module ] = "finit_module",
};
#define NUM_SYSCALLS ARRAY_SIZE(syscall_names)
#define NUM_ACTIONS (NUM_SYSCALLS+64)
enum action {
A_DEFAULT, // Use the default action
A_NO, // Always forbid
A_YES, // Always permit
A_FILENAME, // Permit if arg1 is a known filename
A_ACTION_MASK = 15,
A_NO_RETVAL = 32, // Does not return a value
A_SAMPLE_MEM = 64, // Sample memory usage before the syscall
A_LIBERAL = 128, // Valid only in liberal mode
// Must fit in a unsigned char
};
static unsigned char syscall_action[NUM_ACTIONS] = {
#define S(x) [__NR_##x]
// Syscalls permitted for specific file names
S(open) = A_FILENAME,
S(creat) = A_FILENAME,
S(unlink) = A_FILENAME,
S(access) = A_FILENAME,
S(truncate) = A_FILENAME,
S(stat) = A_FILENAME,
S(lstat) = A_FILENAME,
S(readlink) = A_FILENAME,
#ifndef CONFIG_BOX_USER_AMD64
S(oldstat) = A_FILENAME,
S(oldlstat) = A_FILENAME,
S(truncate64) = A_FILENAME,
S(stat64) = A_FILENAME,
S(lstat64) = A_FILENAME,
#endif
// Syscalls permitted always
S(exit) = A_YES | A_SAMPLE_MEM,
S(read) = A_YES,
S(write) = A_YES,
S(close) = A_YES,
S(lseek) = A_YES,
S(getpid) = A_YES,
S(getuid) = A_YES,
S(dup) = A_YES,
S(brk) = A_YES,
S(getgid) = A_YES,
S(geteuid) = A_YES,
S(getegid) = A_YES,
S(dup2) = A_YES,
S(ftruncate) = A_YES,
S(fstat) = A_YES,
S(personality) = A_YES,
S(readv) = A_YES,
S(writev) = A_YES,
S(getresuid) = A_YES,
#ifdef __NR_pread64
S(pread64) = A_YES,
S(pwrite64) = A_YES,
#else
S(pread) = A_YES,
S(pwrite) = A_YES,
#endif
S(fcntl) = A_YES,
S(mmap) = A_YES,
S(munmap) = A_YES,
S(ioctl) = A_YES,
S(uname) = A_YES,
S(gettid) = A_YES,
S(set_thread_area) = A_YES,
S(get_thread_area) = A_YES,
S(set_tid_address) = A_YES,
S(exit_group) = A_YES | A_SAMPLE_MEM,
#ifdef CONFIG_BOX_USER_AMD64
S(arch_prctl) = A_YES,
#else
S(oldfstat) = A_YES,
S(ftruncate64) = A_YES,
S(_llseek) = A_YES,
S(fstat64) = A_YES,
S(fcntl64) = A_YES,
S(mmap2) = A_YES,
#endif
// Syscalls permitted only in liberal mode
S(time) = A_YES | A_LIBERAL,
S(alarm) = A_YES | A_LIBERAL,
S(pause) = A_YES | A_LIBERAL,
S(fchmod) = A_YES | A_LIBERAL,
S(getrlimit) = A_YES | A_LIBERAL,
S(getrusage) = A_YES | A_LIBERAL,
S(gettimeofday) = A_YES | A_LIBERAL,
S(select) = A_YES | A_LIBERAL,
S(setitimer) = A_YES | A_LIBERAL,
S(getitimer) = A_YES | A_LIBERAL,
S(mprotect) = A_YES | A_LIBERAL,
S(getdents) = A_YES | A_LIBERAL,
S(getdents64) = A_YES | A_LIBERAL,
S(fdatasync) = A_YES | A_LIBERAL,
S(mremap) = A_YES | A_LIBERAL,
S(poll) = A_YES | A_LIBERAL,
S(getcwd) = A_YES | A_LIBERAL,
S(nanosleep) = A_YES | A_LIBERAL,
S(rt_sigreturn) = A_YES | A_LIBERAL | A_NO_RETVAL,
S(rt_sigaction) = A_YES | A_LIBERAL,
S(rt_sigprocmask) = A_YES | A_LIBERAL,
S(rt_sigpending) = A_YES | A_LIBERAL,
S(rt_sigtimedwait) = A_YES | A_LIBERAL,
S(rt_sigqueueinfo) = A_YES | A_LIBERAL,
S(rt_sigsuspend) = A_YES | A_LIBERAL,
S(_sysctl) = A_YES | A_LIBERAL,
#ifndef CONFIG_BOX_USER_AMD64
S(sigaction) = A_YES | A_LIBERAL,
S(sgetmask) = A_YES | A_LIBERAL,
S(ssetmask) = A_YES | A_LIBERAL,
S(sigsuspend) = A_YES | A_LIBERAL,
S(sigpending) = A_YES | A_LIBERAL,
S(sigreturn) = A_YES | A_LIBERAL | A_NO_RETVAL,
S(sigprocmask) = A_YES | A_LIBERAL,
S(ugetrlimit) = A_YES | A_LIBERAL,
S(readdir) = A_YES | A_LIBERAL,
S(signal) = A_YES | A_LIBERAL,
S(_newselect) = A_YES | A_LIBERAL,
#endif
#undef S
};
static const char *
syscall_name(unsigned int id, char *buf)
{
if (id < NUM_SYSCALLS && syscall_names[id])
return syscall_names[id];
else
{
sprintf(buf, "#%d", id);
return buf;
}
}
static int
syscall_by_name(char *name)
{
for (unsigned int i=0; i<NUM_SYSCALLS; i++)
if (syscall_names[i] && !strcmp(syscall_names[i], name))
return i;
if (name[0] == '#')
name++;
if (!*name)
return -1;
char *ep;
unsigned long l = strtoul(name, &ep, 0);
if (*ep)
return -1;
if (l >= NUM_ACTIONS)
return NUM_ACTIONS;
return l;
}
static int
set_syscall_action(char *a)
{
char *sep = strchr(a, '=');
enum action act = A_YES;
if (sep)
{
*sep++ = 0;
if (!strcmp(sep, "yes"))
act = A_YES;
else if (!strcmp(sep, "no"))
act = A_NO;
else if (!strcmp(sep, "file"))
act = A_FILENAME;
else
return 0;
}
int sys = syscall_by_name(a);
if (sys < 0)
die("Unknown syscall `%s'", a);
if (sys >= NUM_ACTIONS)
die("Syscall `%s' out of range", a);
syscall_action[sys] = act;
return 1;
}
/*** Path rules ***/
struct path_rule {
char *path;
enum action action;
struct path_rule *next;
};
static struct path_rule default_path_rules[] = {
{ "/etc/", A_YES },
{ "/lib/", A_YES },
{ "/usr/lib/", A_YES },
{ "/opt/lib/", A_YES },
{ "/usr/share/zoneinfo/", A_YES },
{ "/usr/share/locale/", A_YES },
{ "/dev/null", A_YES },
{ "/dev/zero", A_YES },
{ "/proc/meminfo", A_YES },
{ "/proc/self/stat", A_YES },
{ "/proc/self/exe", A_YES }, // Needed by FPC 2.0.x runtime
{ "/proc/self/maps", A_YES }, // Needed by glibc when it reports arena corruption
};
static struct path_rule *user_path_rules;
static struct path_rule **last_path_rule = &user_path_rules;
static int
set_path_action(char *a)
{
char *sep = strchr(a, '=');
enum action act = A_YES;
if (sep)
{
*sep++ = 0;
if (!strcmp(sep, "yes"))
act = A_YES;
else if (!strcmp(sep, "no"))
act = A_NO;
else
return 0;
}
struct path_rule *r = xmalloc(sizeof(*r) + strlen(a) + 1);
r->path = (char *)(r+1);
strcpy(r->path, a);
r->action = act;
r->next = NULL;
*last_path_rule = r;
last_path_rule = &r->next;
return 1;
}
static enum action
match_path_rule(struct path_rule *r, char *path)
{
char *rr = r->path;
while (*rr)
if (*rr++ != *path++)
{
if (rr[-1] == '/' && !path[-1])
break;
return A_DEFAULT;
}
if (rr > r->path && rr[-1] != '/' && *path)
return A_DEFAULT;
return r->action;
}
/*** Environment rules ***/
struct env_rule {
char *var; // Variable to match
char *val; // ""=clear, NULL=inherit
int var_len;
struct env_rule *next;
};
static struct env_rule *first_env_rule;
static struct env_rule **last_env_rule = &first_env_rule;
static struct env_rule default_env_rules[] = {
{ "LIBC_FATAL_STDERR_", "1" }
};
static int
set_env_action(char *a0)
{
struct env_rule *r = xmalloc(sizeof(*r) + strlen(a0) + 1);
char *a = (char *)(r+1);
strcpy(a, a0);
char *sep = strchr(a, '=');
if (sep == a)
return 0;
r->var = a;
if (sep)
{
*sep++ = 0;
r->val = sep;
}
else
r->val = NULL;
*last_env_rule = r;
last_env_rule = &r->next;
r->next = NULL;
return 1;
}
static int
match_env_var(char *env_entry, struct env_rule *r)
{
if (strncmp(env_entry, r->var, r->var_len))
return 0;
return (env_entry[r->var_len] == '=');
}
static void
apply_env_rule(char **env, int *env_sizep, struct env_rule *r)
{
// First remove the variable if already set
int pos = 0;
while (pos < *env_sizep && !match_env_var(env[pos], r))
pos++;
if (pos < *env_sizep)
{
(*env_sizep)--;
env[pos] = env[*env_sizep];
env[*env_sizep] = NULL;
}
// What is the new value?
char *new;
if (r->val)
{
if (!r->val[0])
return;
new = xmalloc(r->var_len + 1 + strlen(r->val) + 1);
sprintf(new, "%s=%s", r->var, r->val);
}
else
{
pos = 0;
while (environ[pos] && !match_env_var(environ[pos], r))
pos++;
if (!(new = environ[pos]))
return;
}
// Add it at the end of the array
env[(*env_sizep)++] = new;
env[*env_sizep] = NULL;
}
static char **
setup_environment(void)
{
// Link built-in rules with user rules
for (int i=ARRAY_SIZE(default_env_rules)-1; i >= 0; i--)
{
default_env_rules[i].next = first_env_rule;
first_env_rule = &default_env_rules[i];
}
// Scan the original environment
char **orig_env = environ;
int orig_size = 0;
while (orig_env[orig_size])
orig_size++;
// For each rule, reserve one more slot and calculate length
int num_rules = 0;
for (struct env_rule *r = first_env_rule; r; r=r->next)
{
num_rules++;
r->var_len = strlen(r->var);
}
// Create a new environment
char **env = xmalloc((orig_size + num_rules + 1) * sizeof(char *));
int size;
if (pass_environ)
{
memcpy(env, environ, orig_size * sizeof(char *));
size = orig_size;
}
else
size = 0;
env[size] = NULL;
// Apply the rules one by one
for (struct env_rule *r = first_env_rule; r; r=r->next)
apply_env_rule(env, &size, r);
// Return the new env and pass some gossip
if (verbose > 1)
{
fprintf(stderr, "Passing environment:\n");
for (int i=0; env[i]; i++)
fprintf(stderr, "\t%s\n", env[i]);
}
return env;
}
/*** Low-level parsing of syscalls ***/
#ifdef CONFIG_BOX_KERNEL_AMD64
typedef uint64_t arg_t;
#else
typedef uint32_t arg_t;
#endif
struct syscall_args {
arg_t sys;
arg_t arg1, arg2, arg3;
arg_t result;
struct user user;
};
static int user_mem_fd;
static int read_user_mem(arg_t addr, char *buf, int len)
{
if (!user_mem_fd)
{
char memname[64];
sprintf(memname, "/proc/%d/mem", (int) box_pid);
user_mem_fd = open(memname, O_RDONLY);
if (user_mem_fd < 0)
die("open(%s): %m", memname);
}
if (lseek64(user_mem_fd, addr, SEEK_SET) < 0)
die("lseek64(mem): %m");
return read(user_mem_fd, buf, len);
}
static void close_user_mem(void)
{
if (user_mem_fd)
{
close(user_mem_fd);
user_mem_fd = 0;
}
}
#ifdef CONFIG_BOX_KERNEL_AMD64
static void
get_syscall_args(struct syscall_args *a, int is_exit)
{
if (ptrace(PTRACE_GETREGS, box_pid, NULL, &a->user) < 0)
die("ptrace(PTRACE_GETREGS): %m");
a->sys = a->user.regs.orig_rax;
a->result = a->user.regs.rax;
/*
* CAVEAT: We have to check carefully that this is a real 64-bit syscall.
* We test whether the process runs in 64-bit mode, but surprisingly this
* is not enough: a 64-bit process can still issue the INT 0x80 instruction
* which performs a 32-bit syscall. Currently, the only known way how to
* detect this situation is to inspect the instruction code (the kernel
* keeps a syscall type flag internally, but it is not accessible from
* user space). Hopefully, there is no instruction whose suffix is the
* code of the SYSCALL instruction. Sometimes, one would wish the
* instruction codes to be unique even when read backwards :)
*/
if (is_exit)
return;
int sys_type;
uint16_t instr;
switch (a->user.regs.cs)
{
case 0x23:
// 32-bit CPU mode => only 32-bit syscalls can be issued
sys_type = 32;
break;
case 0x33:
// 64-bit CPU mode
if (read_user_mem(a->user.regs.rip-2, (char *) &instr, 2) != 2)
err("FO: Cannot read syscall instruction");
switch (instr)
{
case 0x050f:
break;
case 0x80cd:
err("FO: Forbidden 32-bit syscall in 64-bit mode");
default:
err("XX: Unknown syscall instruction %04x", instr);
}
sys_type = 64;
break;
default:
err("XX: Unknown code segment %04jx", (intmax_t) a->user.regs.cs);
}
#ifdef CONFIG_BOX_USER_AMD64
if (sys_type != 64)
err("FO: Forbidden %d-bit mode syscall", sys_type);
#else
if (sys_type != (exec_seen ? 32 : 64))
err("FO: Forbidden %d-bit mode syscall", sys_type);
#endif
if (sys_type == 32)
{
a->arg1 = a->user.regs.rbx;
a->arg2 = a->user.regs.rcx;
a->arg3 = a->user.regs.rdx;
}
else
{
a->arg1 = a->user.regs.rdi;
a->arg2 = a->user.regs.rsi;
a->arg3 = a->user.regs.rdx;
}
}
static void
set_syscall_nr(struct syscall_args *a, arg_t sys)
{
a->sys = sys;
a->user.regs.orig_rax = sys;
if (ptrace(PTRACE_SETREGS, box_pid, NULL, &a->user) < 0)
die("ptrace(PTRACE_SETREGS): %m");
}
static void
sanity_check(void)
{
}
#else
static void
get_syscall_args(struct syscall_args *a, int is_exit UNUSED)
{
if (ptrace(PTRACE_GETREGS, box_pid, NULL, &a->user) < 0)
die("ptrace(PTRACE_GETREGS): %m");
a->sys = a->user.regs.orig_eax;
a->arg1 = a->user.regs.ebx;
a->arg2 = a->user.regs.ecx;
a->arg3 = a->user.regs.edx;
a->result = a->user.regs.eax;
}
static void
set_syscall_nr(struct syscall_args *a, arg_t sys)
{
a->sys = sys;
a->user.regs.orig_eax = sys;
if (ptrace(PTRACE_SETREGS, box_pid, NULL, &a->user) < 0)
die("ptrace(PTRACE_SETREGS): %m");
}
static void
sanity_check(void)
{
#if !defined(CONFIG_BOX_ALLOW_INSECURE)
struct utsname uts;
if (uname(&uts) < 0)
die("uname() failed: %m");
if (!strcmp(uts.machine, "x86_64"))
die("Running 32-bit sandbox on 64-bit kernels is inherently unsafe. Please get a 64-bit version.");
#endif
}
#endif
/*** Syscall checks ***/
static void
valid_filename(arg_t addr)
{
char namebuf[4096], *p, *end;
if (!file_access)
err("FA: File access forbidden");
if (file_access >= 9)
return;
p = end = namebuf;
do
{
if (p >= end)
{
int remains = PAGE_SIZE - (addr & (PAGE_SIZE-1));
int l = namebuf + sizeof(namebuf) - end;
if (l > remains)
l = remains;
if (!l)
err("FA: Access to file with name too long");
remains = read_user_mem(addr, end, l);
if (remains < 0)
die("read(mem): %m");
if (!remains)
err("FA: Access to file with name out of memory");
end += remains;
addr += remains;
}
}
while (*p++);
msg("[%s] ", namebuf);
if (file_access >= 3)
return;
// Everything in current directory is permitted
if (!strchr(namebuf, '/') && strcmp(namebuf, ".."))
return;
// ".." anywhere in the path is forbidden
enum action act = A_DEFAULT;
if (strstr(namebuf, ".."))
act = A_NO;
// Scan user rules
for (struct path_rule *r = user_path_rules; r && !act; r=r->next)
act = match_path_rule(r, namebuf);
// Scan built-in rules
if (file_access >= 2)
for (int i=0; i<ARRAY_SIZE(default_path_rules) && !act; i++)
act = match_path_rule(&default_path_rules[i], namebuf);
if (act != A_YES)
err("FA: Forbidden access to file `%s'", namebuf);
}
// Check syscall. If invalid, return -1, otherwise return the action mask.
static int
valid_syscall(struct syscall_args *a)
{
unsigned int sys = a->sys;
unsigned int act = (sys < NUM_ACTIONS) ? syscall_action[sys] : A_DEFAULT;
if (act & A_LIBERAL)
{
if (filter_syscalls != 1)
act = A_DEFAULT;
}
switch (act & A_ACTION_MASK)
{
case A_YES:
return act;
case A_NO:
return -1;
case A_FILENAME:
valid_filename(a->arg1);
return act;
default: ;
}
switch (sys)
{
case __NR_kill:
if (a->arg1 == (arg_t) box_pid)
{
meta_printf("exitsig:%d\n", (int) a->arg2);
err("SG: Committed suicide by signal %d", (int) a->arg2);
}
return -1;
case __NR_tgkill:
if (a->arg1 == (arg_t) box_pid && a->arg2 == (arg_t) box_pid)
{
meta_printf("exitsig:%d\n", (int) a->arg3);
err("SG: Committed suicide by signal %d", (int) a->arg3);
}
return -1;
default:
return -1;
}
}
static void
signal_alarm(int unused UNUSED)
{
/* Time limit checks are synchronous, so we only schedule them there. */
timer_tick = 1;
alarm(1);
}
static void
signal_int(int unused UNUSED)
{
/* Interrupts are fatal, so no synchronization requirements. */
meta_printf("exitsig:%d\n", SIGINT);
err("SG: Interrupted");
}
#define PROC_BUF_SIZE 4096
static void
read_proc_file(char *buf, char *name, int *fdp)
{
int c;
if (!*fdp)
{
sprintf(buf, "/proc/%d/%s", (int) box_pid, name);
*fdp = open(buf, O_RDONLY);
if (*fdp < 0)
die("open(%s): %m", buf);
}
lseek(*fdp, 0, SEEK_SET);
if ((c = read(*fdp, buf, PROC_BUF_SIZE-1)) < 0)
die("read on /proc/$pid/%s: %m", name);
if (c >= PROC_BUF_SIZE-1)
die("/proc/$pid/%s too long", name);
buf[c] = 0;
}
static void
check_timeout(void)
{
if (wall_timeout)
{
struct timeval now, wall;
int wall_ms;
gettimeofday(&now, NULL);
timersub(&now, &start_time, &wall);
wall_ms = wall.tv_sec*1000 + wall.tv_usec/1000;
if (wall_ms > wall_timeout)
err("TO: Time limit exceeded (wall clock)");
if (verbose > 1)
fprintf(stderr, "[wall time check: %d msec]\n", wall_ms);
}
if (timeout)
{
char buf[PROC_BUF_SIZE], *x;
int utime, stime, ms;
static int proc_stat_fd;
read_proc_file(buf, "stat", &proc_stat_fd);
x = buf;
while (*x && *x != ' ')
x++;
while (*x == ' ')
x++;
if (*x++ != '(')
die("proc stat syntax error 1");
while (*x && (*x != ')' || x[1] != ' '))
x++;
while (*x == ')' || *x == ' ')
x++;
if (sscanf(x, "%*c %*d %*d %*d %*d %*d %*d %*d %*d %*d %*d %d %d", &utime, &stime) != 2)
die("proc stat syntax error 2");
ms = (utime + stime) * 1000 / ticks_per_sec;
if (verbose > 1)
fprintf(stderr, "[time check: %d msec]\n", ms);
if (ms > timeout && ms > extra_timeout)
err("TO: Time limit exceeded");
}
}
static void
sample_mem_peak(void)
{
/*
* We want to find out the peak memory usage of the process, which is
* maintained by the kernel, but unforunately it gets lost when the
* process exits (it is not reported in struct rusage). Therefore we
* have to sample it whenever we suspect that the process is about
* to exit.
*/
char buf[PROC_BUF_SIZE], *x;
static int proc_status_fd;
read_proc_file(buf, "status", &proc_status_fd);
x = buf;
while (*x)
{
char *key = x;
while (*x && *x != ':' && *x != '\n')
x++;
if (!*x || *x == '\n')
break;
*x++ = 0;
while (*x == ' ' || *x == '\t')
x++;
char *val = x;
while (*x && *x != '\n')
x++;
if (!*x)
break;
*x++ = 0;
if (!strcmp(key, "VmPeak"))
{
int peak = atoi(val);
if (peak > mem_peak_kb)
mem_peak_kb = peak;
}
}
if (verbose > 1)
msg("[mem-peak: %u KB]\n", mem_peak_kb);
}
static void
boxkeeper(void)
{
int syscall_count = (filter_syscalls ? 0 : 1);
struct sigaction sa;
is_ptraced = 1;
bzero(&sa, sizeof(sa));
sa.sa_handler = signal_int;
sigaction(SIGINT, &sa, NULL);
gettimeofday(&start_time, NULL);
ticks_per_sec = sysconf(_SC_CLK_TCK);
if (ticks_per_sec <= 0)
die("Invalid ticks_per_sec!");
if (timeout || wall_timeout)
{
sa.sa_handler = signal_alarm;
sigaction(SIGALRM, &sa, NULL);
alarm(1);
}
for(;;)
{
struct rusage rus;
int stat;
pid_t p;
if (timer_tick)
{
check_timeout();
timer_tick = 0;
}
p = wait4(box_pid, &stat, WUNTRACED, &rus);
if (p < 0)
{
if (errno == EINTR)
continue;
die("wait4: %m");
}
if (p != box_pid)
die("wait4: unknown pid %d exited!", p);
if (WIFEXITED(stat))
{
box_pid = 0;
final_stats(&rus);
if (WEXITSTATUS(stat))
{
if (syscall_count)
{
meta_printf("exitcode:%d\n", WEXITSTATUS(stat));
err("RE: Exited with error status %d", WEXITSTATUS(stat));
}
else
{
// Internal error happened inside the child process and it has been already reported.
box_exit(2);
}
}
if (timeout && total_ms > timeout)
err("TO: Time limit exceeded");
if (wall_timeout && wall_ms > wall_timeout)
err("TO: Time limit exceeded (wall clock)");
flush_line();
fprintf(stderr,"OK\n");
box_exit(0);
}
if (WIFSIGNALED(stat))
{
box_pid = 0;
meta_printf("exitsig:%d\n", WTERMSIG(stat));
final_stats(&rus);
err("SG: Caught fatal signal %d%s", WTERMSIG(stat), (syscall_count ? "" : " during startup"));
}
if (WIFSTOPPED(stat))
{
int sig = WSTOPSIG(stat);
if (sig == SIGTRAP)
{
if (verbose > 2)
msg("[ptrace status %08x] ", stat);
static int stop_count;
if (!stop_count++) /* Traceme request */
msg(">> Traceme request caught\n");
else
err("SG: Breakpoint");
ptrace(PTRACE_SYSCALL, box_pid, 0, 0);
}
else if (sig == (SIGTRAP | 0x80))
{
if (verbose > 2)
msg("[ptrace status %08x] ", stat);
struct syscall_args a;
static unsigned int sys_tick, last_act;
static arg_t last_sys;
if (++sys_tick & 1) /* Syscall entry */
{
char namebuf[32];
int act;
get_syscall_args(&a, 0);
arg_t sys = a.sys;
msg(">> Syscall %-12s (%08jx,%08jx,%08jx) ", syscall_name(sys, namebuf), (intmax_t) a.arg1, (intmax_t) a.arg2, (intmax_t) a.arg3);
if (!exec_seen)
{
msg("[master] ");
if (sys == NATIVE_NR_execve)
{
exec_seen = 1;
close_user_mem();
}
}
else if ((act = valid_syscall(&a)) >= 0)
{
last_act = act;
syscall_count++;
if (act & A_SAMPLE_MEM)
sample_mem_peak();
}
else
{
/*
* Unfortunately, PTRACE_KILL kills _after_ the syscall completes,
* so we have to change it to something harmless (e.g., an undefined
* syscall) and make the program continue.
*/
set_syscall_nr(&a, ~(arg_t)0);
err("FO: Forbidden syscall %s", syscall_name(sys, namebuf));
}
last_sys = sys;
}
else /* Syscall return */
{
get_syscall_args(&a, 1);
if (a.sys == ~(arg_t)0)
{
/* Some syscalls (sigreturn et al.) do not return a value */
if (!(last_act & A_NO_RETVAL))
err("XX: Syscall does not return, but it should");
}
else
{
if (a.sys != last_sys)
err("XX: Mismatched syscall entry/exit");
}
if (last_act & A_NO_RETVAL)
msg("= ?\n");
else
msg("= %jd\n", (intmax_t) a.result);
}
ptrace(PTRACE_SYSCALL, box_pid, 0, 0);
}
else if (sig == SIGSTOP)
{
msg(">> SIGSTOP\n");
if (ptrace(PTRACE_SETOPTIONS, box_pid, NULL, (void *) PTRACE_O_TRACESYSGOOD) < 0)
die("ptrace(PTRACE_SETOPTIONS): %m");
ptrace(PTRACE_SYSCALL, box_pid, 0, 0);
}
else if (sig != SIGXCPU && sig != SIGXFSZ)
{
msg(">> Signal %d\n", sig);
sample_mem_peak(); /* Signal might be fatal, so update mem-peak */
ptrace(PTRACE_SYSCALL, box_pid, 0, sig);
}
else
{
meta_printf("exitsig:%d", sig);
err("SG: Received signal %d", sig);
}
}
else
die("wait4: unknown status %x, giving up!", stat);
}
}
static void
box_inside(int argc, char **argv)
{
struct rlimit rl;
char *args[argc+1];
memcpy(args, argv, argc * sizeof(char *));
args[argc] = NULL;
if (set_cwd && chdir(set_cwd))
die("chdir: %m");
if (redir_stdin)
{
close(0);
if (open(redir_stdin, O_RDONLY) != 0)
die("open(\"%s\"): %m", redir_stdin);
}
if (redir_stdout)
{
close(1);
if (open(redir_stdout, O_WRONLY | O_CREAT | O_TRUNC, 0666) != 1)
die("open(\"%s\"): %m", redir_stdout);
}
if (redir_stderr)
{
close(2);
if (open(redir_stderr, O_WRONLY | O_CREAT | O_TRUNC, 0666) != 2)
die("open(\"%s\"): %m", redir_stderr);
}
else
dup2(1, 2);
setpgrp();
if (memory_limit)
{
rl.rlim_cur = rl.rlim_max = memory_limit * 1024;
if (setrlimit(RLIMIT_AS, &rl) < 0)
die("setrlimit(RLIMIT_AS): %m");
}
rl.rlim_cur = rl.rlim_max = (stack_limit ? (rlim_t)stack_limit * 1024 : RLIM_INFINITY);
if (setrlimit(RLIMIT_STACK, &rl) < 0)
die("setrlimit(RLIMIT_STACK): %m");
rl.rlim_cur = rl.rlim_max = 64;
if (setrlimit(RLIMIT_NOFILE, &rl) < 0)
die("setrlimit(RLIMIT_NOFILE): %m");
char **env = setup_environment();
if (filter_syscalls)
{
if (ptrace(PTRACE_TRACEME) < 0)
die("ptrace(PTRACE_TRACEME): %m");
/* Trick: Make sure that we are stopped until the boxkeeper wakes up. */
raise(SIGSTOP);
}
execve(args[0], args, env);
die("execve(\"%s\"): %m", args[0]);
}
static void
usage(void)
{
fprintf(stderr, "Invalid arguments!\n");
printf("\
Usage: box [<options>] -- <command> <arguments>\n\
\n\
Options:\n\
-a <level>\tSet file access level (0=none, 1=cwd, 2=/etc,/lib,..., 3=whole fs, 9=no checks; needs -f)\n\
-c <dir>\tChange directory to <dir> first\n\
-e\t\tInherit full environment of the parent process\n\
-E <var>\tInherit the environment variable <var> from the parent process\n\
-E <var>=<val>\tSet the environment variable <var> to <val>; unset it if <var> is empty\n\
-f\t\tFilter system calls (-ff=very restricted)\n\
-i <file>\tRedirect stdin from <file>\n\
-k <size>\tLimit stack size to <size> KB (default: 0=unlimited)\n\
-m <size>\tLimit address space to <size> KB\n\
-M <file>\tOutput process information to <file> (name:value)\n\
-o <file>\tRedirect stdout to <file>\n\
-p <path>\tPermit access to the specified path (or subtree if it ends with a `/')\n\
-p <path>=<act>\tDefine action for the specified path (<act>=yes/no)\n\
-r <file>\tRedirect stderr to <file>\n\
-s <sys>\tPermit the specified syscall (be careful)\n\
-s <sys>=<act>\tDefine action for the specified syscall (<act>=yes/no/file)\n\
-t <time>\tSet run time limit (seconds, fractions allowed)\n\
-T\t\tAllow syscalls for measuring run time\n\
-v\t\tBe verbose (use multiple times for even more verbosity)\n\
-w <time>\tSet wall clock time limit (seconds, fractions allowed)\n\
-x <time>\tSet extra timeout, before which a timing-out program is not yet killed,\n\
\t\tso that its real execution time is reported (seconds, fractions allowed)\n\
-A <opt>\tPass <opt> as additional argument to the <command>\n\
\t\tBe noted that this option will be appended after <arguments> respectively\n\
");
exit(2);
}
int
main(int argc, char **argv)
{
int c;
uid_t uid;
char **prog_argv = xmalloc(sizeof(char*) * argc);
int prog_argc = 0;
while ((c = getopt(argc, argv, "a:c:eE:fi:k:m:M:o:p:r:s:t:Tvw:x:A:")) >= 0)
switch (c)
{
case 'a':
file_access = atol(optarg);
break;
case 'c':
set_cwd = optarg;
break;
case 'e':
pass_environ = 1;
break;
case 'E':
if (!set_env_action(optarg))
usage();
break;
case 'f':
filter_syscalls++;
break;
case 'k':
stack_limit = atol(optarg);
break;
case 'i':
redir_stdin = optarg;
break;
case 'm':
memory_limit = atol(optarg);
break;
case 'M':
meta_open(optarg);
break;
case 'o':
redir_stdout = optarg;
break;
case 'p':
if (!set_path_action(optarg))
usage();
break;
case 'r':
redir_stderr = optarg;
break;
case 's':
if (!set_syscall_action(optarg))
usage();
break;
case 't':
timeout = 1000*atof(optarg);
break;
case 'T':
syscall_action[__NR_times] = A_YES;
break;
case 'v':
verbose++;
break;
case 'w':
wall_timeout = 1000*atof(optarg);
break;
case 'x':
extra_timeout = 1000*atof(optarg);
case 'A':
prog_argv[prog_argc++] = strdup(optarg);
break;
break;
default:
usage();
}
if (optind >= argc)
usage();
sanity_check();
uid = geteuid();
if (setreuid(uid, uid) < 0)
die("setreuid: %m");
box_pid = fork();
if (box_pid < 0)
die("fork: %m");
if (!box_pid) {
int real_argc = prog_argc + argc - optind;
char **real_argv = xmalloc(sizeof(char*) * (real_argc));
for (int i = 0;i < argc-optind;i++)
real_argv[i] = strdup(argv[i+optind]);
for (int i = 0;i < prog_argc;i++)
real_argv[argc - optind + i] = strdup(prog_argv[i]);
box_inside(real_argc, real_argv);
} else
boxkeeper();
die("Internal error: fell over edge of the world");
}