qemu-seccomp.c

   1 /*
   2  * QEMU seccomp mode 2 support with libseccomp
   3  *
   4  * Copyright IBM, Corp. 2012
   5  *
   6  * Authors:
   7  *  Eduardo Otubo    <eotubo@br.ibm.com>
   8  *
   9  * This work is licensed under the terms of the GNU GPL, version 2.  See
  10  * the COPYING file in the top-level directory.
  11  *
  12  * Contributions after 2012-01-13 are licensed under the terms of the
  13  * GNU GPL, version 2 or (at your option) any later version.
  14  */
  15 #include <stdio.h>
  16 #include <seccomp.h>
  17 #include "sysemu/seccomp.h"
  18
  19 struct QemuSeccompSyscall {
  20     int32_t num;
  21     uint8_t priority;
  22 };
  23
  24 static const struct QemuSeccompSyscall seccomp_whitelist[] = {
  25     { SCMP_SYS(timer_settime), 255 },
  26     { SCMP_SYS(timer_gettime), 254 },
  27     { SCMP_SYS(futex), 253 },
  28     { SCMP_SYS(select), 252 },
  29 #if defined(__x86_64__)
  30     { SCMP_SYS(recvfrom), 251 },
  31     { SCMP_SYS(sendto), 250 },
  32 #elif defined(__i386__)
  33     { SCMP_SYS(socketcall), 250 },
  34 #endif
  35     { SCMP_SYS(read), 249 },
  36     { SCMP_SYS(brk), 248 },
  37     { SCMP_SYS(clone), 247 },
  38     { SCMP_SYS(mmap), 247 },
  39     { SCMP_SYS(mprotect), 246 },
  40     { SCMP_SYS(execve), 245 },
  41     { SCMP_SYS(open), 245 },
  42     { SCMP_SYS(ioctl), 245 },
  43 #if defined(__x86_64__)
  44     { SCMP_SYS(socket), 245 },
  45     { SCMP_SYS(setsockopt), 245 },
  46     { SCMP_SYS(recvmsg), 245 },
  47     { SCMP_SYS(sendmsg), 245 },
  48     { SCMP_SYS(accept), 245 },
  49     { SCMP_SYS(connect), 245 },
  50     { SCMP_SYS(socketpair), 245 },
  51     { SCMP_SYS(bind), 245 },
  52     { SCMP_SYS(listen), 245 },
  53     { SCMP_SYS(semget), 245 },
  54 #elif defined(__i386__)
  55     { SCMP_SYS(ipc), 245 },
  56 #endif
  57     { SCMP_SYS(gettimeofday), 245 },
  58     { SCMP_SYS(readlink), 245 },
  59     { SCMP_SYS(access), 245 },
  60     { SCMP_SYS(prctl), 245 },
  61     { SCMP_SYS(signalfd), 245 },
  62     { SCMP_SYS(getrlimit), 245 },
  63     { SCMP_SYS(set_tid_address), 245 },
  64     { SCMP_SYS(statfs), 245 },
  65     { SCMP_SYS(unlink), 245 },
  66     { SCMP_SYS(wait4), 245 },
  67 #if defined(__i386__)
  68     { SCMP_SYS(fcntl64), 245 },
  69     { SCMP_SYS(fstat64), 245 },
  70     { SCMP_SYS(stat64), 245 },
  71     { SCMP_SYS(getgid32), 245 },
  72     { SCMP_SYS(getegid32), 245 },
  73     { SCMP_SYS(getuid32), 245 },
  74     { SCMP_SYS(geteuid32), 245 },
  75     { SCMP_SYS(sigreturn), 245 },
  76     { SCMP_SYS(_newselect), 245 },
  77     { SCMP_SYS(_llseek), 245 },
  78     { SCMP_SYS(mmap2), 245 },
  79     { SCMP_SYS(sigprocmask), 245 },
  80 #endif
  81     { SCMP_SYS(sched_getparam), 245 },
  82     { SCMP_SYS(sched_getscheduler), 245 },
  83     { SCMP_SYS(fstat), 245 },
  84     { SCMP_SYS(clock_getres), 245 },
  85     { SCMP_SYS(sched_get_priority_min), 245 },
  86     { SCMP_SYS(sched_get_priority_max), 245 },
  87     { SCMP_SYS(stat), 245 },
  88     { SCMP_SYS(uname), 245 },
  89     { SCMP_SYS(eventfd2), 245 },
  90     { SCMP_SYS(io_getevents), 245 },
  91     { SCMP_SYS(dup), 245 },
  92     { SCMP_SYS(dup2), 245 },
  93     { SCMP_SYS(dup3), 245 },
  94     { SCMP_SYS(gettid), 245 },
  95     { SCMP_SYS(getgid), 245 },
  96     { SCMP_SYS(getegid), 245 },
  97     { SCMP_SYS(getuid), 245 },
  98     { SCMP_SYS(geteuid), 245 },
  99     { SCMP_SYS(timer_create), 245 },
 100     { SCMP_SYS(exit), 245 },
 101     { SCMP_SYS(clock_gettime), 245 },
 102     { SCMP_SYS(time), 245 },
 103     { SCMP_SYS(restart_syscall), 245 },
 104     { SCMP_SYS(pwrite64), 245 },
 105     { SCMP_SYS(nanosleep), 245 },
 106     { SCMP_SYS(chown), 245 },
 107     { SCMP_SYS(openat), 245 },
 108     { SCMP_SYS(getdents), 245 },
 109     { SCMP_SYS(timer_delete), 245 },
 110     { SCMP_SYS(exit_group), 245 },
 111     { SCMP_SYS(rt_sigreturn), 245 },
 112     { SCMP_SYS(sync), 245 },
 113     { SCMP_SYS(pread64), 245 },
 114     { SCMP_SYS(madvise), 245 },
 115     { SCMP_SYS(set_robust_list), 245 },
 116     { SCMP_SYS(lseek), 245 },
 117     { SCMP_SYS(pselect6), 245 },
 118     { SCMP_SYS(fork), 245 },
 119     { SCMP_SYS(eventfd), 245 },
 120     { SCMP_SYS(rt_sigprocmask), 245 },
 121     { SCMP_SYS(write), 244 },
 122     { SCMP_SYS(fcntl), 243 },
 123     { SCMP_SYS(tgkill), 242 },
 124     { SCMP_SYS(rt_sigaction), 242 },
 125     { SCMP_SYS(pipe2), 242 },
 126     { SCMP_SYS(munmap), 242 },
 127     { SCMP_SYS(mremap), 242 },
 128     { SCMP_SYS(fdatasync), 242 },
 129     { SCMP_SYS(close), 242 },
 130     { SCMP_SYS(rt_sigpending), 242 },
 131     { SCMP_SYS(rt_sigtimedwait), 242 },
 132     { SCMP_SYS(readv), 242 },
 133     { SCMP_SYS(writev), 242 },
 134     { SCMP_SYS(preadv), 242 },
 135     { SCMP_SYS(pwritev), 242 },
 136     { SCMP_SYS(setrlimit), 242 },
 137     { SCMP_SYS(ftruncate), 242 },
 138     { SCMP_SYS(lstat), 242 },
 139     { SCMP_SYS(pipe), 242 },
 140     { SCMP_SYS(umask), 242 },
 141     { SCMP_SYS(chdir), 242 },
 142     { SCMP_SYS(setitimer), 242 },
 143     { SCMP_SYS(setsid), 242 },
 144     { SCMP_SYS(poll), 242 },
 145     { SCMP_SYS(epoll_create), 242 },
 146     { SCMP_SYS(epoll_ctl), 242 },
 147     { SCMP_SYS(epoll_wait), 242 },
 148 #if defined(__i386__)
 149     { SCMP_SYS(waitpid), 242 },
 150 #elif defined(__x86_64__)
 151     { SCMP_SYS(getsockname), 242 },
 152     { SCMP_SYS(getpeername), 242 },
 153     { SCMP_SYS(accept4), 242 },
 154     { SCMP_SYS(newfstatat), 241 },
 155     { SCMP_SYS(shutdown), 241 },
 156     { SCMP_SYS(getsockopt), 241 },
 157     { SCMP_SYS(semctl), 241 },
 158     { SCMP_SYS(semop), 241 },
 159     { SCMP_SYS(semtimedop), 241 },
 160     { SCMP_SYS(epoll_ctl_old), 241 },
 161     { SCMP_SYS(epoll_wait_old), 241 },
 162 #endif
 163     { SCMP_SYS(epoll_pwait), 241 },
 164     { SCMP_SYS(epoll_create1), 241 },
 165     { SCMP_SYS(ppoll), 241 },
 166     { SCMP_SYS(creat), 241 },
 167     { SCMP_SYS(link), 241 },
 168     { SCMP_SYS(getpid), 241 },
 169     { SCMP_SYS(getppid), 241 },
 170     { SCMP_SYS(getpgrp), 241 },
 171     { SCMP_SYS(getpgid), 241 },
 172     { SCMP_SYS(getsid), 241 },
 173     { SCMP_SYS(getdents64), 241 },
 174     { SCMP_SYS(getresuid), 241 },
 175     { SCMP_SYS(getresgid), 241 },
 176     { SCMP_SYS(getgroups), 241 },
 177 #if defined(__i386__)
 178     { SCMP_SYS(getresuid32), 241 },
 179     { SCMP_SYS(getresgid32), 241 },
 180     { SCMP_SYS(getgroups32), 241 },
 181     { SCMP_SYS(signal), 241 },
 182     { SCMP_SYS(sigaction), 241 },
 183     { SCMP_SYS(sigsuspend), 241 },
 184     { SCMP_SYS(sigpending), 241 },
 185     { SCMP_SYS(truncate64), 241 },
 186     { SCMP_SYS(ftruncate64), 241 },
 187     { SCMP_SYS(fchown32), 241 },
 188     { SCMP_SYS(chown32), 241 },
 189     { SCMP_SYS(lchown32), 241 },
 190     { SCMP_SYS(statfs64), 241 },
 191     { SCMP_SYS(fstatfs64), 241 },
 192     { SCMP_SYS(fstatat64), 241 },
 193     { SCMP_SYS(lstat64), 241 },
 194     { SCMP_SYS(sendfile64), 241 },
 195     { SCMP_SYS(ugetrlimit), 241 },
 196 #endif
 197     { SCMP_SYS(alarm), 241 },
 198     { SCMP_SYS(rt_sigsuspend), 241 },
 199     { SCMP_SYS(rt_sigqueueinfo), 241 },
 200     { SCMP_SYS(rt_tgsigqueueinfo), 241 },
 201     { SCMP_SYS(sigaltstack), 241 },
 202     { SCMP_SYS(signalfd4), 241 },
 203     { SCMP_SYS(truncate), 241 },
 204     { SCMP_SYS(fchown), 241 },
 205     { SCMP_SYS(lchown), 241 },
 206     { SCMP_SYS(fchownat), 241 },
 207     { SCMP_SYS(fstatfs), 241 },
 208     { SCMP_SYS(sendfile), 241 },
 209     { SCMP_SYS(getitimer), 241 },
 210     { SCMP_SYS(syncfs), 241 },
 211     { SCMP_SYS(fsync), 241 },
 212     { SCMP_SYS(fchdir), 241 },
 213     { SCMP_SYS(flock), 241 },
 214     { SCMP_SYS(msync), 241 },
 215     { SCMP_SYS(sched_setparam), 241 },
 216     { SCMP_SYS(sched_setscheduler), 241 },
 217     { SCMP_SYS(sched_yield), 241 },
 218     { SCMP_SYS(sched_rr_get_interval), 241 },
 219     { SCMP_SYS(sched_setaffinity), 241 },
 220     { SCMP_SYS(sched_getaffinity), 241 },
 221     { SCMP_SYS(readahead), 241 },
 222     { SCMP_SYS(timer_getoverrun), 241 },
 223     { SCMP_SYS(unlinkat), 241 },
 224     { SCMP_SYS(readlinkat), 241 },
 225     { SCMP_SYS(faccessat), 241 },
 226     { SCMP_SYS(get_robust_list), 241 },
 227     { SCMP_SYS(splice), 241 },
 228     { SCMP_SYS(vmsplice), 241 },
 229     { SCMP_SYS(getcpu), 241 },
 230     { SCMP_SYS(sendmmsg), 241 },
 231     { SCMP_SYS(recvmmsg), 241 },
 232     { SCMP_SYS(prlimit64), 241 },
 233     { SCMP_SYS(waitid), 241 },
 234     { SCMP_SYS(io_setup), 241 },
 235     { SCMP_SYS(io_destroy), 241 }
 236 };
 237
 238 int seccomp_start(void)
 239 {
 240     int rc = 0;
 241     unsigned int i = 0;
 242     scmp_filter_ctx ctx;
 243
 244     ctx = seccomp_init(SCMP_ACT_KILL);
 245     if (ctx == NULL) {
 246         goto seccomp_return;
 247     }
 248
 249     for (i = 0; i < ARRAY_SIZE(seccomp_whitelist); i++) {
 250         rc = seccomp_rule_add(ctx, SCMP_ACT_ALLOW, seccomp_whitelist[i].num, 0);
 251         if (rc < 0) {
 252             goto seccomp_return;
 253         }
 254         rc = seccomp_syscall_priority(ctx, seccomp_whitelist[i].num,
 255                                       seccomp_whitelist[i].priority);
 256         if (rc < 0) {
 257             goto seccomp_return;
 258         }
 259     }
 260
 261     rc = seccomp_load(ctx);
 262
 263   seccomp_return:
 264     seccomp_release(ctx);
 265     return rc;
 266 }